REVIEW article

Front. Cell Dev. Biol., 27 October 2020

Sec. Signaling

Volume 8 - 2020 | https://doi.org/10.3389/fcell.2020.581732

Caveolae as Potential Hijackable Gates in Cell Communication

  • 1. Biochemistry-Proteomics Laboratory, Victor Babes National Institute of Pathology, Bucharest, Romania

  • 2. Cell Biology and Histology Department, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania

  • 3. Clinical Biochemistry Department, Faculty of Medicine, Titu Maiorescu University, Bucharest, Romania

Abstract

Caveolae are membrane microdomains described in many cell types involved in endocytocis, transcytosis, cell signaling, mechanotransduction, and aging. They are found at the interface with the extracellular environment and are structured by caveolin and cavin proteins. Caveolae and caveolins mediate transduction of chemical messages via signaling pathways, as well as non-chemical messages, such as stretching or shear stress. Various pathogens or signals can hijack these gates, leading to infectious, oncogenic and even caveolin-related diseases named caveolinopathies. By contrast, preclinical and clinical research have fallen behind in their attempts to hijack caveolae and caveolins for therapeutic purposes. Caveolae involvement in human disease is not yet fully explored or understood and, of all their scaffold proteins, only caveolin-1 is being considered in clinical trials as a possible biomarker of disease. This review briefly summarizes current knowledge about caveolae cell signaling and raises the hypothesis whether these microdomains could serve as hijackable “gatekeepers” or “gateways” in cell communication. Furthermore, because cell signaling is one of the most dynamic domains in translating data from basic to clinical research, we pay special attention to translation of caveolae, caveolin, and cavin research into clinical practice.

Introduction

The term “caveolae” is more than 60 years old and traces back to seminal electron microscopy studies conducted independently by G.E. Palade (Palade, 1953; ) and E. Yamada of various tissues including endothelia (Yamada, 1955a,b; Smith and Ryan, 1972) and muscle (Merrillees, 1960; Zampighi et al., 1975; Sawada et al., 1978). For a long time, their function(s) remained elusive, until electron microscopy studies complemented by biochemical investigations led to in vitro functional studies and in vivo models. In 2001, Lisanti’s lab produced the first caveolin knockout (KO) mouse strain (Cav1–/–) (Razani et al., 2001). Further research revealed that caveolae and their scaffold proteins are involved in specific cellular processes, such as plasma microdomain organization and cell signaling ()—in both normal cells (Sowa, 2012) or tumor cells ()—or even in a specific kind of tumor (Parat and Riggins, 2012). Caveolae also are involved in cell migration and metastasis (Nunez-Wehinger et al., 2014), mechano-reception (Nassoy and Lamaze, 2012), and mechano-protection in certain tissues (Lo et al., 2015). Embryologic development is a less explored area in caveolin research (but for review, see Sohn et al., 2016).

Technological progress in cell imaging has improved our understanding of how biochemical components of caveolae assemble into a functional ultrastructural domain of the cell membrane. Knockout animal models have added more to a comprehensive picture of these microdomains. Tracking the literature describing all of these membrane microdomains means navigating a flood of publications on caveolae and their scaffold proteins, caveolins, and cavins. Of about 100 reviews published in the last 5 years, only a few offer an integrated view (; ; ; Lamaze et al., 2017; ; ; Parton et al., 2018; Leo et al., 2020). An inventory of (un)resolved issues regarding caveolae is exquisitely summarized in a recent review unconventionally entitled “Caveolae: The FAQs” (Parton et al., 2020).

This review briefly summarizes the knowledge in caveolae cell signaling and assesses the status of these microdomains as both gatekeepers and gateways in cell communication. Furthermore, because cell signaling is one of the most dynamic domains in translating data from basic to clinical research, special attention will be paid to caveolae, caveolins, and cavins research translation into clinical practice.

Ultrastructure of Caveolae, Related to Caveolins, and Cavins Expression

Based on the first electron micrograph reports, caveolae were categorized and further evaluated as endocytotic vesicles (; Levin and Page, 1980; McGuire and Twietmeyer, 1983; Noguchi et al., 1987; Severs, 1988; ). Organized as omega-shaped plasma membrane microdomains (segments of membrane with special lipid composition; ), caveolae have been studied in experimental setups relying on cholesterol depletion (Liu and Pilch, 2008; ). However, cholesterol is also enriched in other membrane microdomains, such as lipid rafts and chlatrin coated pits. Cholesterol depletion affects with variable degree a significant number of endocytotic pathways (reviewed in Thottacherry et al., 2019), thus generating results that lack specificity. Caveolae have been described in many cell types, including endothelial cells, smooth and striated muscle cells, interstitial cells of the heart (), adipose cells, fibroblasts, and Schwann cells of myelinated or unmyelinated peripheral nerve fibers (Figure 1). The number of caveolae varies in different cell types and has been reported to be up to 10,000/cell in endothelial cells () and about 1,000,000/cell in adipocytes (Thorn et al., 2003). The number of caveolae also varies in smooth muscle cells of different tissues from Wistar rats, with 0.48 c/μm in the muscularis mucosa of stomach, 0.57 c/μm in the media of the aorta, 0.74 c/μm in the bladder, and 1.06 c/μm in the myometrium (Popescu et al., 2006). More so, the number of caveolae seems to be modified in pathological conditions, and a decreased number of caveolae in aortic smooth muscle cells has been associated with hypertension (Potje et al., 2019).

FIGURE 1

The protein scaffold composition of caveolae was resolved by mass spectrometry and cryoelectron tomography (Ludwig et al., 2013, 2016). The main scaffolding proteins are members of the caveolin family [caveolin (Cav)-1, -2, and -3], which associate as homo- or heterooligomers. The protein expression of caveolins differs in various tissues, as well as in their propensity to associate in heterooligomers. Caveolins have an even wider distribution, being detected even in cells that do not organize caveolae. Cav-1 is the main protein to form caveolae in non-muscle cells, alone or with Cav-2 (), and its absence results in a lack of caveolae at least in endothelial and smooth muscle cells (Figure 2). Cav-2 KO mice show evidence of severe pulmonary dysfunction without disruption of caveolae (Razani et al., 2002). Cav-1/3 double-KO mice are viable but lack both muscle and non-muscle caveolae and develop a severe cardiomyopathic phenotype (Park et al., 2002). Cav-3 is the main scaffold protein of muscle cell membrane caveolae (Sohn et al., 2016). Mutations in this gene lead to skeletal muscle disease through multiple pathogenetic mechanisms, and Cav-3 deficiency has led to the recognition of a new category of pathologies labeled the caveolinopathies. These conditions include sarcolemmal membrane alterations, disorganization of the skeletal muscle T-tubule network, and disruption of distinct cell-signaling pathways. To date, 30 Cav-3 mutations have been identified in the human population. Cav-3 defects underlie four distinct skeletal muscle disease phenotypes: limb girdle muscular dystrophy, rippling muscle disease, distal myopathy, and hyperCKemia. In addition, one Cav-3 mutant has been described in a case of hypertrophic cardiomyopathy ().

FIGURE 2

In addition, cavin proteins (cavins 1–4) are recruited from cytosol to caveolae in the presence of caveolins and are required to stabilize the caveolar structure by multiple low-affinity interactions with caveolins and membrane lipids (Parton et al., 2018; Figure 3).

FIGURE 3

Similar to Cav-1, cavin-1 is required for caveolae formation, and KO of either leads to caveolae loss (; Liu and Pilch, 2008). Cavin-2 deficiency in mice causes tissue-specific loss of caveolae, affecting lung endothelium and adipose tissue but not the endothelium in skeletal and cardiac tissue (). In vitro, cavin-2 induces membrane curvature in caveolae (), serves as part of a cholesterol sensor, and relocalizes cavin-1 from the cytosol to the plasma membrane (). Cavin-3 does not play a major role in caveolae formation and composition (Liu et al., 2014a). Less is known about the pathogenic impact of cavin mutations in humans. Cavin-1 mutations cause secondary deficiency of caveolins, resulting in muscular dystrophy with generalized lipodystrophy (). Also, muscle hypertrophy, muscle mounding, mild metabolic complications, and elevated serum creatine kinase levels have been observed in these patients (; Rajab et al., 2010). Cavin-1 mutations also are associated with congenital general lipodystrophy type 4 (Shastry et al., 2010; Jelani et al., 2015; Patni et al., 2019). Cavin-4 (MURC) has been associated with dilated cardiomyopathy (Rodriguez G. et al., 2011; Szabadosova et al., 2018).

Biogenesis and stabilization of caveolae are further supported by accessory proteins, such as membrane curvature–regulating protein PACSIN2/Syndapin II, Eps-15 homology domain 2 ATPase, and receptor tyrosine kinase–like orphan receptor 1 (Lamaze et al., 2017). Both syndapin II (Koch et al., 2012; Senju and Suetsugu, 2015) and III (Seemann et al., 2017) were shown to be important in membrane shaping and stabilization of caveolae.

Apart from proteins, caveolae have a high cholesterol content, sphingomyelin, and phosphatidylserine to serve as anchoring points for cavins (Lamaze et al., 2017). The reverse of this interaction—how caveolae and their protein constituents affect lipid metabolism—is less studied (; ; ).

Clustering of caveolae has been observed in different cells as “caveolar cluster-rosettes” or “multiple bulbs packed in a flower-like fashion,” and mechanisms of assembling in superstructures have been examined by computational analysis (). The assumption has been that attractive forces originating from the energy of membrane deformation generated by the bulbs are responsible for this feature. The mechano-protective role of these structures (Szabadosova et al., 2018) putatively relays on the ability to disintegrate upon cell stretching (). Formation of clusters of caveole is promoted by caveolar neck proteins EDH 1, 2, and 4, which partially compensate for each other to protect the cell against mechanical stress (Yeow et al., 2017).

Novel imagistic methods began to call into question some of putative characteristic features of caveolae: the specific smooth omega shape was actually an artifact of glutaraldehyde fixation (Schlormann et al., 2010), high resolution scanning EM and quick-freeze deep-etch techniques detected striations or ridges on the cytoplasmic side (Izumi et al., 1991), also detectable on flattened caveolae (Rothberg et al., 1992). A 3-D electron tomographic study showed a spiral organization of the coating (Lebbink et al., 2010), adding evidence to previous suggestions that caveolae are indeed covered by a spiky coat (Richter et al., 2008). This protein complex has been designated the caveolar coat complex, consisting of Cav-1, Cav-2 and cavins 1, 2, and 3, found in a rather strict stoichiometry of cavin-1: total caveolin—1:4. Cavins 2 and 3 were detected in a ratio of 1:2 to cavin-1 (Ludwig et al., 2013). This stoichiometry was confirmed by further studies and the coatomer organization of the caveolae was unraveled. Cavin-1 homotrimers or heterotrimers of cavins (cavin 1 to either cavin 2 or 3 in a stoichiometry of 2–3:1) are the core constituent of the coat, interacting with approximately 12 caveolin molecules (Krijnse Locker and Schmid, 2013). Using single-molecule analysis of fluorescently tagged cavins, showed that in cavin hetrotrimers, expression of cavin 2 and 3 was mutually exclusive and the ratio of cavin 1: cavin 2 may vary, whereas the ratio of cavin 1: cavin 3 was 3:1. A ratio of Cav-1:cavin 1 of 3–4:1 was also confirmed. Cryoelectron tomography revealed that this caveolar coat has an inner layer composed of caveolins that assemble into a polyhedral cage, and a peripheral filamentous layer composed of cavins (Ludwig et al., 2016), responsible for the spiral aspect noticed in deep-etch studies. Using mutational analysis and cryoelectron investigations, Stoeber et al. (2016) proposed a regular dodecahedron model for the cavin coat Cav-1 oligomers associate into discs that occupy the faces of the dodecahedron. Superresolution microscopy studies further proposed a modular superstructure of caveolae, constructed on smaller scaffolds of Cav-1 oligomers, which can dimerize and oligomerize into the polyhedral caveolae coat (Khater et al., 2018, 2019a,b).

From a functional point of view, caveolae initially were considered to be endocytotic vesicles, but following early ultrastructural reports, Popescu et al. (1974) proposed a specific role in calcium signaling and smooth muscle contraction. That step opened the way to the “renaissance in thinking of caveolae as organizing centers for signal transduction” (Ostrom and Insel, 1999), a shift in scientific perception supported by identification and further study of the first caveolin (Rothberg et al., 1992). Ever since, opinions about what deserves the most attention in caveolins research have been shifting, from markers for caveolae to demonstrate co-localization of other proteins to these membrane-microdomains (; Lupu et al., 1997; Scherer and Lisanti, 1997; Wu et al., 1997), to active players involved in protein–protein interactions and recruitment of other proteins, to caveolin scaffolding domains (CSDs) (). Caveolins were found to co-purify with different kinases and to participate in signaling events (Li et al., 1995, 1996a; ). Still, interaction between caveolins and various proteins via caveolin-binding motifs was challenged, based on the variety of the latter, their structural role and their accesibility to interacting proteins (; ). Nevertheless, aberrant cell signaling is a hallmark of cancer, and caveolins were reported to be deregulated in tumor pathogenesis (Razani et al., 2000; ; Quest et al., 2008). An early yet continuous trend in caveolae research has been their involvement in the physiology of muscle tissue (), leading to studies of caveolins in muscle contraction (Thyberg, 2000; ; Ohsawa et al., 2004) mechanosensing (; Spisni et al., 2003) and muscle disease (; Tanase et al., 2009). They are now also considered dynamic membrane reservoirs, providing mechanoprotection against membrane damage upon changes in membrane tensions (Sinha et al., 2011), which leads to flattening of caveolae and lateral diffusion of Cav-1, followed by slow reconstruction (Tachikawa et al., 2017).

Caveolae in Cell Communication

To date, functional studies have shown that caveolaedo not simply convey extracellular signals but also are actively involved in their modulation. Caveolin binding is reported to inhibit kinase activity for (i) heterotrimeric G proteins, with caveolin interacting directly with multiple G protein alpha subunits, including G(s), G(o), and G(i2) (Song et al., 1996); (ii) members of the Ras superfamily, such as H-Ras (Song et al., 1996) and RhoC (Lin et al., 2005); and (iii) Src tyrosine kinases (Li et al., 1996a), acting as negative regulators and sequestering them to the plasma membrane. Caveolins also are associated with endothelial nitric oxide synthase signaling () through direct protein–protein interactions (), exerting a suppressive effect (Razani et al., 2001). Protein–protein interaction has been reported for CSDs and other kinases, such as PKA (Levin et al., 2006), and co-localization with Cav-1 has been demonstrated, although without confirming a physical interaction (Stubbs et al., 2005). Caveolae also harbor key proteins involved in calcium signaling (Pani and Singh, 2009), with a functional impact on striated () and smooth muscle contraction, either directly (Yang et al., 2015) or indirectly via endothelial nitric oxide synthase endothelial signaling and shear stress in endothelial cells (Yamamoto et al., 2018). In cardiac muscle, Cav-3 participates in scaffolding a molecular complex centered on calcium channels (; ). In neurons, Cav-1 binds to calcium-sensing proteins and mediates photoreceptor activity (Vladimirov et al., 2018), or independently of calcium, to neurotransmitter receptors (Schmitz et al., 2010; Roh et al., 2014).

Caveolae might act as reservoirs of signaling proteins, maintained in inactive forms, until the “holders” are signaled to release them. Conformational changes in caveolins are at least in part phosphorylation-dependent (Li et al., 1996b), under the control of the very same kinases that they inactivate, acting as negative feedback signals ().

One of the few exceptions from the caveolae inhibitory effect is insulin signaling (Yamamoto et al., 1998). Early studies have indicated that in adipocytes and pre-adipocytes, downstream insulin signaling requires intact caveolae (Parpal et al., 2001). In an embryonic kidney cell line, both Cav-1 and Cav-3 could directly stimulate insulin receptor kinase activity (Yamamoto et al., 1998). Furthermore, insulin signaling triggered relocation of Glut4 to caveolae (for review, see ; ). Recently, other caveolae-associated proteins, such as EHD2 (Moren et al., 2019) and NECC2 (Travez et al., 2018), have been identified as part of the insulin-caveolae signaling mechanism. Studies using a Cavin-1 null mouse have revealed a distinct lipodystrophic, insulin-resistant phenotype (Liu et al., 2008), which also has been subsequently documented in patients who are cavin-1 deficient (Pilch and Liu, 2011). In contrast, loss of cavin-3 does not have a significant impact on adipose tissue and glucose metabolism, as shown in cavin-3 KO mice (Liu et al., 2014a).

Of note, Cav-1 retains signaling functions in the absence of caveolae, as it continues to act as a scaffolding platform for signaling proteins. In neurons, Cav-1 was proposed to scaffold signaling components promoting neuronal survival, growth cone arborization () and axonal growth (Wang et al., 2019). Furthermore, flattening of caveolae under membrane tension might trigger itself downstream signaling by cavin-1 release (Sinha et al., 2011), protein kinase C activation (Senju et al., 2015) or cooperation with cytoskeleton ().

Oncogenic Signaling and Caveolins

A significant body of evidence involves caveolins in oncogenesis and emerged as a consequence of caveolins’ ability to suppress cellular signaling pathways. Initial reports highlighted caveolae and caveolin downregulation in transformed cells (Koleske et al., 1995; ; ), and murine Cav-1 and 2 genes were mapped to a tumor suppressor locus (). Since then, numerous data have been collected from cell lines involving both Cav-1 and -2 (Sagara et al., 2004), [colon carcinoma (), human breast cancer (Lee et al., 1998), and ovarian carcinoma (Miotti et al., 2005)], or only Cav-1 (Racine et al., 1999). Further data have come from studies with KO animals (; Williams et al., 2004) and human tissue samples of human colon carcinoma (), pancreatic adenocarcinoma (Tanase, 2008; Tanase et al., 2009) lung neoplasia (Kato et al., 2004), breast () and ovarian cancer (Wiechen et al., 2001a), and malignant mesenchymal tumors (Wiechen et al., 2001b). The role for caveolins as guardians against oncogenic transformation is supported by reports that loss of Cav-1 in tumor-associated fibroblasts drives a change in phenotype from “normal” to “fuel-supplier,” modifying the stromal environment of cancer cells into a medium favoring survival (Mercier et al., 2008; Trimmer et al., 2011).

This suppressor status has been challenged over time, however, with some limited but fairly consistent evidence of Cav-1 overexpression in various types of cancer. These findings have sometimes been in contradiction with datasets from the same types of cancer in which Cav-1 overexpression was reported (Patlolla et al., 2004) and in other cases have arisen in areas of cancer study where caveolins have otherwise gone unexamined (; Suzuoki et al., 2002; Steffens et al., 2011). Caveolin expression seems to be increased in urogenital cancers (Kasahara et al., 2002; ; Joo et al., 2004), although not exclusively so. Some results suggest involvement of Cav-1 in resistance to cancer treatments (Sekhar et al., 2013, as reviewed in Ketteler and Klein, 2018), and in tumor spreading (reviewed in Senetta et al., 2013; ).

On the other hand, involvement of Cav-2 in tumor biology was not investigated until recently. The few data reported so far converge toward a protumorigenic role for Cav-2. In a Cav-2 KO mouse model, its loss seems to favor infiltration of tumor-associated macrophages into the tumor tissue and tumor regression (Liu et al., 2019). It also reduces metastatic potential of pancreatic cell lines (Liang et al., 2018) and its serum levels are increased in patients with pancreatic cancer, a finding associated with poor prognosis (Liang et al., 2018). Similar to Cav-1, Cav-2 involvement in tumorigenesis seems to depend on the tumor type. Investigation of Cav-2 expression in lung cancer have revealed a loss of protein during metastasis in lymph nodes, which correlated with poor prognosis ().

The role of the cavin family as an oncogene or tumor suppressor is also controversial, depending on the cell and/or tissue type.

Most reports show the same trends for cavins as observed for Cav-1. Loss of cavin-1 is correlated with poor prognosis in colorectal cancer (Wang et al., 2017) and liposarcoma (). Loss of cavin-2 also is correlated with a poor prognosis in liposarcoma () and hepatocellular carcinoma (Jing et al., 2016). In glioblastoma () and pancreatic adenocarcinoma, cavin-1 enhances the prognostic potency of Cav-1 (Liu et al., 2014b).

Cell-to-Pathogen Interaction at Caveolar Sites

Caveolins were related to both antiviral and antibacterial defense. Cav-1 was proposed as a T cell–intrinsic orchestrator of TCR-mediated membrane polarity and signal specificity selectively employed by CD8 T cells to customize TCR responsiveness (Tomassian et al., 2011). Downregulation of Cav-1 apparently disperses clusters of antiviral defense–related receptors (), and Cav-1 KO cells display increased exosome uptake (Svensson et al., 2013). Overexpressing Cav-1 in macrophages seems to lower virion infectivity by altering cholesterol content (Lin et al., 2012) or cellular proteins required for viral replication (Simmons et al., 2012).

Viruses

Conversely, Cav-1 is a target of viral attacks, serving as a safe environment for viral replication (Yan et al., 2012), including of coronavirus strains (Nomura et al., 2004; ; Wang et al., 2020). Similar to other membrane microdomains, caveolae serve as entry gates for viruses, such as simian immunodeficiency virus (Neu et al., 2008), HCV (Shi et al., 2003), some species of adenoviruses (Leung and Brown, 2011), some herpesviridae (; Kerur et al., 2010), group B of coxsackie viruses (Patel et al., 2009), foot-and-mouth disease virus (O’Donnell et al., 2008), some types of papilloma virus (Smith et al., 2007), echovirus-1 (Pietiainen et al., 2004), some coronaviruses (Nomura et al., 2004; ; Wang et al., 2020), and some types of flavivirus (Zhu et al., 2012). Viral hijacking of caveolae is summarized in Figure 4 (based on Xing et al., 2020).

FIGURE 4

A few viruses even seem to incorporate Cav-1 into new virions (; Laliberte et al., 2006; Ravid et al., 2010). Whether caveolins are only part of the “vessel” or are being hijacked and used as “anchors” has been elucidated for some pathogens. Molecular modeling and simulation have suggested the existence of caveolin-binding sites for SARS-CoV proteins (), although a Cav-independent mechanism also has been described (Wang et al., 2008), and for rotavirus endotoxin (Mir et al., 2007), HIV envelope proteins (), human influenza A viruses (Sun et al., 2010), and murine leukemia viruses (Yu Z. et al., 2006).

Bacteria

Recent results offer growing evidence of Cav-1 acts against bacterial infections, as well (Tsai et al., 2011; ). It plays a protective role against fibronectin-binding pathogens, such as Staphylococcus aureus () and Pseudomonas aeruginosa (), prevents Neisseria gonorrhoeae uptake (), and is a critical protective modulator of sepsis ().

On the other hand, some strains of streptococci (Rohde et al., 2003), chlamydia (Webley et al., 2004), Salmonella (Lim et al., 2010), Mycobacterium, Brucella species, FimH expressing E. coli (for review see ; Medina-Kauwe, 2007), other aggressive strains of E. coli (Rogers et al., 2012), Campylobacter jejuni (Watson and Galan, 2008), Bordetella pertussis (Martin et al., 2015), Leptospira interrogans (Li et al., 2019), and Rickettsia () also use this endocytic pathway for host infectivity. In addition, caveolae are targeted by Gram-negative bacterial outer membrane vesicles, structures involved in secretion of virulence determinants, modulation of the host immune response, and contributions to biofilm formation and stability (Sharpe et al., 2011). Gonococci use Cav-1 phosphorylation and downstream signaling to switch from local to invasive infection (). Bacterial entry into cells was divided in active and passive entry (). Salmonella typhimurium was identified as an example of active entry, driven by secreted proteins, while Chlamydia trachomatis as a typical example of passive entering germ (). Caveolae-mediated endocytosis was shown to be not involved in Clostridium difficile toxin A endocytosis (). This paper illustrates a thinking pattern, suggesting that clathrin-dependent and caveolae-dependent-mediated endocytosis have to be equally explored as routes for both bacteria or bacterial products. Clathrin, caveolae, macropinocytosis and secretory lysosomes were investigated as the four major points (gates) pathogens can hijack (). Regarding mechanisms used for hijacking, data is scares as only a few articles examined specifically this subject (; Watson and Galan, 2008; , ; Lim et al., 2014; Martin et al., 2015; ; see also Table 1).

TABLE 1

Entity typeName of speciesExperimental findings Caveolin-dependentReferences
VirusesSARS coronavirusMolecular modeling and simulation have suggested the existence of caveolin-binding sites for SARS-CoV proteins ALSO “SARS coronavirus entry into host cells through a clathrin- and caveolae-independent endocytic pathway”; Wang et al., 2008
Human coronavirusCav-1 knockdown by RNA interference reduced the HCoV-229E infection. As mechanism, HCoV-229E binded to CD13 in DRMs, then clustered CD13 by cross-linking AND caveolin-1 dependent endocytosis was documented by confocal microscopy; the vesicle internalization process required actin cytoskeleton rearrangements.”Nomura et al., 2004; Owczarek et al., 2018
Hepatitis B Virus (HBV)“HBV requires a Cav-1-mediated entry pathway to initiate productive infection in HepaRG cells; chemical inhibitors that specifically inhibit clathrin-mediated endocytosis had no effect on HBV infection.”Macovei et al., 2010
Human influenza A virus (H1N1)“Cav-1 modulated influenza virus A replication presumably based on M2/Cav-1 interaction”Sun et al., 2010
Human immunodeficiency virus (HIV)“HIV infection up-regulated the expression of Cav-1 and the enhanced level of Cav-1 subsequently represses virus replication by suppressing the activity of NF-κB, promoting cholesterol efflux, and blocking the fusion steps of virus infectivity.”Mergia, 2017
Japanese encephalitis virus (JEV)“JEV entered human neuronal cells by caveolin-1-mediated endocytosis,. RhoA activation promoted the phosphorylation of caveolin-1, and then Rac1 activation facilitated caveolin-associated viral internalization” ALSO “JEV enters porcine kidney epithelial PK15 cells through cholesterol- and clathrin-mediated endocytosis”Yang et al., 2013; Xu et al., 2016
Respiratory syncytial virus (RSV)“Co-localization of RSV antigen and caveolae was observed by confocal microscopy.” AND “RSV exploits caveolae for its assembly, and we propose that the incorporation of caveolae into the virus contributes to defining the biological properties of the RSV envelope”Werling et al., 1999; Ludwig et al., 2017
Rift Valley fever virus (RVFV)“Inhibitors and RNAi specific for macropinocytosis and clathrin-mediated endocytosis had no effect on RVFV infection. In contrast, inhibitors of caveola-mediated endocytosis, and RNAi targeted to caveolin-1 and dynamin, drastically reduced RVFV infection in multiple cell lines. These results suggest that the primary mechanism of RVFV MP-12 uptake is dynamin-dependent, caveolin-1-mediated endocytosis.”
Human papillomavirus (HPV)“HPV type 31 (HPV31) entry and initiation of early infection events require both caveolin 1 and dynamin 2 and occur independently of clathrin-mediated endocytosis”Smith et al., 2007
Echovirus 1“Immunofluorescence confocal microscopy showed that EV1, alpha 2 beta 1 integrin, and caveolin-1 were internalized together in vesicular structures. Electron microscopy showed the presence of EV1 particles inside caveolae. Furthermore, infective EV1 could be isolated with anti-caveolin-1 beads 15 min p.i., confirming a close association with caveolin-1.”Marjomaki et al., 2002
Murine amphotropic retrovirus (A-MLV)“…we also found colocalization of fusion-defective fluorescent A-MLV virions with caveolin-1 in NIH 3T3 cells.” CONTROVERSIAL “A-MLV is internalized not by caveolae or other pinocytic mechanisms but by macropinocytosis. A-MLV infection of mouse embryonic fibroblasts deficient for caveolin or dynamin, and NIH 3T3 cells knocked down for caveolin expression, was unaffected.”; Rasmussen and Vilhardt, 2015
BacteriaListeria monocytogenesCav1 Cav2 and PACSIN2 promote L. monocytogenes protrusion engulfment during spread.Sanderlin et al., 2019
Edwardsiella tardaEntry of E. tarda into macrophages is clathrin- and caveolin-mediated endocytosis and cytoskeletons, and that the intracellular traffic of E. tarda involves endosomes and endolysosomes.”Sui et al., 2017
Salmonella typhimuriumOver-expression of Cav-1 increased Salmonellae invasion in non-senescent cells. Presence of high expression of Cav-1 in Peyer’s patch and spleen, “might be related to the increased susceptibility of elderly individuals to microbial infections” “a new model in which caveolin-1 might be involved in Salmonella entry via its interaction with SopE and Rac1, leading to enhanced membrane ruffling for phagocytosis into host cells.”Lim et al., 2010, 2014
Ehrlichia chaffeensis Anaplasma phagocytophilumE. chaffeensis and A. phagocytophilum utilize caveolae-mediated endocytosis for host cell entry”Lin and Rikihisa, 2003; reviewed in Samanta et al., 2017
Escherichia coliRNA(i) reduction of cav-1 expression inhibited bacterial invasion; (iii) a signaling molecule required for E. coli invasion was located in lipid rafts and physically associated with caveolin-1; (iv) bacterial invasion was inhibited by lipid raft disrupting/usurping agents.”
Pseudomonas aeruginosaP. aeruginosa colonized cav1 KO mice much better compared with the wild-type controls in a model of chronic infection, indicting an important contribution of Cav-1 to innate host immunity to P. aeruginosa infection in the setting of both acute pneumonia and chronic infection typical of cystic fibrosis” CONTROVERSIAL “Unlike wild type mice, which succumb to pneumonia, caveolin-deficient mice are resistant to Pseudomonas”; Zaas et al., 2009
Mycobacterium tuberculosis“… cav-1 proteins are present in great numbers in the plasma membrane of myeloid-derived suppressor cells (MDSC)”Kotze et al., 2020
ParasitesTrypanosoma cruzi“CD-1 mice infected with the Brazil strain of T. cruzi displayed reduced expression of Cav-3 and activation of ERK 66 days post infection.” AND “Immunofluorescence analysis demonstrated a colocalization of GM1, flotillin 1 and caveolin 1 in the T. cruzi parasitophorous vacuole of macrophages.”;
Leishmania“…virulent L. chagasi localize in caveolae during phagocytosis by host macrophages, and cholesterol-containing macrophage membrane domains, such as caveolae, target parasites to a pathway that promotes delay of lysosome fusion and intracellular survival.”Rodriguez et al., 2006

Summarization of pathogens using caveolae as entry gates.

Some other papers were mentioning bacterial entry, but in a broader context, examining, for example, clathrin-independent mechanisms of endocytosis. It is noteworthy to observe that “nomenclature is imprecise,” criteria used to classify such transport systems relying on “cargoes, or plasma membrane markers, or carrier morphologies, or speed of the process” (for details see ).

Cav-1–/– mice show an increased production of inflammatory cytokines, chemokines (), and nitric oxide and an inability to control systemic infection by Salmonella. The increased chemokine production in these mice leads to greater infiltration of neutrophils into granulomas but no changes in the number of granulomas present. Cav-1–/– macrophages show increased inflammatory responses and increased nitric oxide production in vitro in response to Salmonella lipopolysaccharide. These results show that Cav-1 plays a key role in regulating anti-inflammatory responses in macrophages. These data collectively suggest that the increased production of toxic mediators from macrophages lacking Cav-1 is likely to be responsible for the marked susceptibility of Cav-1–deficient mice to S. enterica serovar Typhimurium (Medina et al., 2006).

Prions

PrP(C) were shown to be associated in rafts with caveolin-1 and signaling molecules, including Fyn and Src tyrosine kinases (Taylor and Hooper, 2006; Toni et al., 2006). These data open the avenue for exploring conditions in which cell are handling prion-like proteins (i.e., neurodegenerative diseases; Muradashvili et al., 2016; Puangmalai et al., 2020).

Parasites

Last, but not least, parasitic pathogens such as Leishmania infantum (Leishmania chagasi) (Rodriguez et al., 2006), Plasmodium vivax (), and Trypanosoma cruzi (Soeiro Mde et al., 1999) also use caveolae as cellular entry point. “Leishmania spp. include the infectious promastigote and the replicative intracellular amastigote.” It was shown that caveolae are contributing to uptake and intracellular survival of virulent promastigotes by macrophages (Rodriguez N. E. et al., 2011). Parasites of the genus Plasmodium induce changes within the host cell, among which, a type of “caveola-vesicle complex” (Sherling and van Ooij, 2016), defined also as “distinctive caveolae nanostructures” (Malleret et al., 2015). Chagas disease is caused by the protozoan parasite Trypanosoma cruzi. Cardiac injury observed during chagasic cardiomyopathy imply caveolae components (reduced expression of caveolin-3) contributing to the feature of disease (). Caveolae/raft-mediated endocytosis was demonstrated as the main route to AgB internalization, “a major component of Echinococcus granulosus metacestode hydatid fluid” ().

Of note, as presented in table 1, caveolae are not exclusive entry gates for these pathogens, who “hijack” other cellular entry pathways [for an update on bacterial manipulation of clathrin see (Latomanski and Newton, 2019), for endocytotic mechanisms used by viruses, (Slonska et al., 2016)and for parasites ()]. Furthermore, lipids enriched in caveolae could play a part in virus entry ()and virus replication (), but can be found elsewhere in the plasma membrane. This may explain partly why pathogens can enter the cells via caveolae with more or less specificity.

Current data support the idea that functions of caveolae may be hijacked by different means, in different target cells, with different consequences. Diverse viruses, prions, bacteria or parasites are capable of such hijacking. From this point of view caveolae could be considered as potential hijackable cell gates. Identification of key points during the process could make more effectively the treatment of such infectious diseases. Along with these efforts, development new drug delivery techniques could become be more likely.

Gatekeepers of Aging

Cho and Park proposed Cav-1 as a “gatekeeper molecule” and a “major determinant of aging process” (). Cav-1 is involved in the regulation of many cellular processes relevant to stem cell biology, such as growth, control of mitochondrial antioxidant levels, migration, and senescence (). The observation that caveolae are decreased in senescent cells is now more than a decade old (Somara et al., 2007; Lowalekar et al., 2012, reviewed in Nguyen and Cho, 2017) and has been associated with an apparent paradox of increased cellular caveolins (Wheaton et al., 2001). In vitro data have confirmed that overexpression of Cav-1 induces early senescence in different cell types (Volonte et al., 2002; ; ), and Cav-1 KO animal models have a reduced lifespan (Park et al., 2003). Several reports have focused on signaling alterations in normally and induced aging cells (; ). A direct correlation between caveolin deficit and senescence has been reported to involve the Mdm–p53–p21 axis (). In-depth analysis of this correlation has shown that this interaction is cavin-1 dependent (), and through inhibition of Nrf2-mediated signaling, Cav-1 links free radicals to activation of the p53/senescence pathway (Volonte et al., 2013). The same research group has argued that Cav-1 appears to play a major role in the signaling events linking oxidative stress to cellular senescence and identified an oxidant-responsive Cav-1 promoter sequence (). Furthermore, Cav-1 deficiency inhibited cardiolipin synthesis and induced mitochondrial dysfunction (Yu et al., 2017).

Different tissue types age differently in terms of caveolae and caveolins: cardiac muscle maintains the same levels of total Cav-1 and -3, but levels of Cav-1 alpha and -3 increase with aging in purified fractions of caveolae (Ratajczak et al., 2003). Other studies have reported a decrease in Cav-3 with age in ventricular myocytes (Kong et al., 2018). Aged smooth muscle has a reduced number of caveolae and reduced levels of Cav-2 and 3, but non-altered levels of Cav-1 and cavin-1 (Lowalekar et al., 2012), and aged endothelial cells have increased levels of total Cav-1 (Yoon et al., 2010). The hippocampus of aged mice shows low Cav-1 expression, and knocking it out triggers a predisposition to an early Alzheimer’s disease–like phenotype (). Total rat brain levels of Cav-1 are decreased in aged animals (Yang et al., 2018), and skin fibroblasts upregulate Cav-1 in both chronological and UV-induced skin aging (Kruglikov et al., 2019).

Transduction of Environmental, Non-chemical Signals

Of all environmental cues perceived by cells, caveolae play an important part in translating those involved in mechanotransduction (Rizzo et al., 2003; Sinha et al., 2011; Joshi et al., 2012). This role has been comprehensively reviewed (Nassoy and Lamaze, 2012; Shihata et al., 2016), including the involvement of caveolae in signaling events, but new facets are being constantly added to this particular facet of caveolae behavior. Caveolae sensitivity to environmental physical stimuli was being uncovered as researchers began to also reveal their involvement in cellular signaling (Rizzo et al., 1998, 2003; Spisni et al., 2003), and changes in caveolar morphology under muscle stretch were reported even earlier (). Caveolae morphology and number, as well as caveolins expression and distribution, seem to depend on shear stress (), gravitational force (), and mechanical stretch (Sinha et al., 2011). Along with disappearance of caveolae following mechanical stress in muscle cells, Cav-1 and -3 are translocated to non-caveolar membrane sites (Kawabe et al., 2004) and Cav-1 showed increased phosphorylation (Zhang et al., 2007) in a context of increased kinase activity and signaling events. Cavins are released into the cytosol, where they form a pool for subsequent caveolar reconstruction (Tillu et al., 2015).

Although Cav-3 is muscle specific, its involvement in stretch-induced cell signaling has been less studied than that of Cav-1 and may not even be mandatory for some signaling pathways (). Cav-3 has been recently demonstrated to regulate IL6/STAT3 mechano-signaling (and mechano-protection) (Tate et al., 1987). Both the increase in shear stress and the cessation of flow trigger a mechano-signaling cascade that leads to the generation of reactive oxygen species (Noel et al., 2013). Through their structure, composition, and mechanical properties, caveolae limit activity of mechanosensitive ion channels, which seems to require Cav-3 (). One hypothesis is that the reservoir of Cav-1 and glycosphingolipids can be released to control mechano-signaling (Nassoy and Lamaze, 2012).

Localization of small GTPases involved in cytoskeleton rearrangement within the caveolar compartments seems to be essential for stretch-signal transduction (Kawamura et al., 2003). Regulation of RhoA, for example, drives actomyosin contractility and other mechanosensitive pathways, suggesting that caveolae could couple mechanotransduction pathways to actin-controlled changes in tension through their association with stress fibers (). Unfolding of caveolae under stress, followed by activation of Src and redistribution of caveolin and glycosphingolipids, might reflect mechanisms of the cellular adaptation to mechanical stresses (). The role of caveolae as mechanosensors has been extensively reviewed (Nassoy and Lamaze, 2012; ).

The mechanosensing of caveolae is only partially supplemented by other cellular mechanisms, as demonstrated by KO animal models. Cav-1 KO mice have impaired-flow–induced vasodilation and flow-dependent arterial remodeling, effects that are rescued by re-expression of endothelial Cav-1 (Yu J. et al., 2006). Muscle fibers from cavin-1–/– mice have a prominent sarcolemmal organization, aberrant T-tubule structures, and increased sensitivity to membrane tension, effects that could be rescued by muscle-specific cavin-1 re-expression. In vivo imaging of live zebrafish embryos showed that loss of muscle-specific cavin-1 or expression of a dystrophy-associated Cav-3 mutant both led to sarcolemmal damage but only in response to vigorous muscle activity (Lo et al., 2015).

Another aspect of environmental communication is extracellular matrix sensing, which triggers cytoskeleton remodeling. Disruption of lipid rafts or knockdown of Cav-1 decreased cell spreading on a stiff matrix, and this effect was mediated by β1 integrin downregulation (Yeh et al., 2017). Effects of defective extracellular matrix stiffness sensing in Cav-1 loss can be rescued by constitutive activation of yes-associated protein (Moreno-Vicente et al., 2018).

Traffic of Macromolecules and Metabolic Regulation

Caveolae are a conserved traffic pathway for a number of proteins, including albumin transfer across the endothelium in physiological (Predescu et al., 2002) and inflammatory conditions (), matrix metalloproteinase traffic (), endocytosis of many surface receptors, and traffic to the Golgi apparatus and endoplasmic reticulum (Le and Nabi, 2003). Involvement of caveolin in endocytosis, as well as the dynamics of caveolae between membrane-attached and scissored state are the topics of several reviews (Parton and Richards, 2003; Lajoie and Nabi, 2010; ).

This prompted the hypothesis that caveolae are “metabolic platforms” and “gateways for the uptake of nutrients across the plasma membrane” (Örtegren et al., 2007). Caveolin-1 has been reported to regulate metabolism of lipid droplets in adipocytes (, reviewed in Martin, 2013) and endothelial cells (Kuo et al., 2018), including the composition in peripheral phospholipids and associated proteins (). CAV-1 gene polymorphisms have been reported in patients with altered lipid metabolism in adult (Mora-Garcia et al., 2017, 2018) and juvenile forms (Nizam et al., 2018). Metabolic alterations are partially mediated by impaired insulin signaling (; Perez-Verdaguer et al., 2018; Travez et al., 2018). Conversely, it was recently shown that lifestyle interventions in patients with impaired glucose regulation changed tissular and plasma cav-1 expression ().

To summarize, caveolae can be viewed as “hijackable gates.” They selectively filter extracellular signals, and no general rule has yet been identified for opening or closing them. The variability of response from cell type to cell type or tumor type to tumor type can be partially explained by different interaction partners. The complete picture of caveolin and cavin alterations in any given type of tumor remains elusive. Another gap that is just gaining attention is the comparative analysis of behavior between the primary tumor and metastatic sites.

The Foreseen Trend: Caveolin Research (Not Yet) Translated Into Clinical Practice

As a consequence of cancer-related studies, Cav-1 and -2 have been investigated as tumor prognostic markers for different types of cancers, mostly carcinomas (Sloan et al., 2009; Langeberg et al., 2010; Steffens et al., 2011; Zhan et al., 2012; Lobos-Gonzalez et al., 2014). The discovery of new communication patterns between cancer and stromal cells, in which Cav-1 seems to be an important key note for both sides (Sotgia et al., 2012), prompted a new paradigm for prognosis of certain cancer types, based on evaluation of Cav-1 in stromal cells (Witkiewicz et al., 2009; Zhao et al., 2013).

In addition to cancer, caveolins are reported to be involved as gatekeepers in a wide variety of pathological processes from neurodegeneration () to lipodystrophy (Martin et al., 2012), atherosclerosis (Pavlides et al., 2014), pulmonary fibrosis (Tourkina et al., 2008), and glaucoma (Thorleifsson et al., 2010). Genetic polymorphisms in the Cav-1 gene are associated with transplant-related renal (Moore et al., 2010) and respiratory pathologies (Kastelijn et al., 2011). Because of its tissue specificity, Cav-3 is involved in specific muscle pathologies, ranging from myodystrophies (Minetti et al., 1998) to arrhythmias ().

Following the many pieces of evidence of caveolin involvement in several pathologies, attempts have been made to target them for therapeutic development in cancer (Tamaskar and Zhou, 2008), cardiovascular diseases (Sellers et al., 2012), and kidney disease (van Dokkum and Buikema, 2009). To date, only 13 clinical trials related to caveolin are listed in the U.S. National Institutes of Health database (Table 2), and only one is registered in Europe, a 2013 clinical study regarding nab-Paclitaxel treatment in HER2-negative metastatic (stage IV) breast cancer. This ongoing European study is evaluating Cav-1 expression as a secondary prognostic marker.

TABLE 2

No.Study TitleConditionsInterventionsPhasePrimary objectiveSecondary objectives related to Cav-1Outcome measures related to Cav-1NCT Number
1Caveolin-1 and Vascular DysfunctionHypertension insulin resistanceDrug: para-aminohippuric Acid Drug: angiotensin II Drug: norepinephrinePhase 1Genetic variation at the Cav-1 locusNCT01426529
2Safety, Tolerability and Pharmacokinetic Study of LTI-03 in Healthy Adult SubjectsIdiopathic pulmonary fibrosisDrug: Cav-1 scaffolding-protein–derived peptide (LTI-03) Drug: placeboPhase 1Incidence of treatment-emergent adverse eventsNCT04233814
3Metformin Hydrochloride and Doxycycline in Treating Patients with Localized Breast or Uterine CancerBreast carcinoma Endometrial clear cell adenocarcinoma Endometrial serous adenocarcinoma Uterine corpus cancer Uterine corpus carcinosarcomaDrug: metformin hydrochloride Drug: doxycyclinePhase 2To determine if treatment with a combination of metformin and doxycycline can increase the percentage of cells that express Cav-1 in the cancer-associated fibroblasts of patients with breast, or uterine, and cervical cancersThe effect of treatment on the expression of Cav-1 in stromal cells related to the percentage of cells expressing ER and PR for breast and uterine samples and HER2 in breast cancer samples.Primary outcome: Change in the percent of stromal cells expressing Cav-1 at an intensity of 1 + or greater assessed by immunohistochemistry Secondary outcome: Percentage of stromal cells expressing Cav-1 in relation to the percentage of cells expressing ER and PR for breast and uterine samples and HER2 in breast cancer samples.NCT02874430
4Fat Biology, Sleep Disorders, and Cardiovascular DiseaseSleep disordered breathing Cardiovascular diseaseCharacterization of serum/plasma levels of Cav-1, and correlate this with the presence or absence of sleep disordered breathing, obesity, and cardiovascular diseaseNot mentionedNCT01229501
5Pilot Study of Anti-oxidant Supplementation With N-Acetyl Cysteine in Stage 0/I Breast CancerStage 0/1 breast cancer Post biopsy Pre-surgeryDrug: IV/oral n-acetylcysteine (NAC)Phase 1Primary outcome: To assess the feasibility of evaluating the effect of n-acetylcysteine on tumor cell metabolism by assessing the changes in expression of Cav-1 and MCT4 in cancer-associated fibroblasts in pre- and post-therapy breast tissue treated with NACNCT01878695
8Schedules of Nab-Paclitaxel in Metastatic Breast CancerMetastatic breast cancerDrug: nab-PaclitaxelPhase 2To investigate the prognostic role of putative markers (SPARC and caveolin) and assess any change in the expression of SPARC and caveolin between primary and the metastatic sitesNCT01746225
9Efficacy and Safety Study of ABI-007 Plus Capecitabine as First-line Chemotherapy for Advanced Gastric Cancer PatientsGastric adenocarcinomaDrug: nanoparticle Albumin-bound paclitaxelPhase 2To identify the molecular biomarkers (such as SPARK, β-Tubulin III, caveolin, etc.) by immunohistochemical and western-blotting before and during therapy, to study the biomarkers correlations with clinical outcome and toxicityNCT01641783
10Correlation Between Blood Biomarkers and Postoperative Delirium in Elective Non-Cardiac SurgeryPostoperative delirium Elective non-cardiac surgeryDiagnostic test: neuropsychological testsPrimary outcome: Serum concentration change in biomarker of blood–brain barrier disruption Cav-1 to be measured at 2 time pointsNCT03915314
11Radiological and Biological Tumoral and Peri-tumoral Factors in Neoadjuvant Endocrine-treated Breast CancersBreast cancerOther: shear-wave elastography Drug: letrozole Procedure: breast core biopsy Other: magnetic resonance imagingNot applicableSecondary outcome: evaluation of Cav-1 in peritumoral tissue by immunohistochemistryNCT02701348
12A Study of Dasatinib (BMS-354825) in Patients With Advanced “Triple-negative” Breast CancerBreast cancer MetastasisDrug: dasatinibPhase 2Secondary outcome: evaluation of Cav-1 by immunohistochemistryNCT00371254
13Neoadjuvant Pembrolizumab(Pbr)/Nab-Paclitaxel Followed by Pbr/Epirubicin/Cyclophosphamide in TNBCMalignant neoplasm of breastDrug: pembrolizumab Drug: nab-paclitaxel Drug: epirubicin Drug: cyclophosphamidePhase 2Other outcome: Cav-1 evaluation by immunohistochemistry at baseline, after treatment, and at surgeryNCT03289819

Clinical trials that include caveolin-1 as target or objective.

https://clinicaltrials.gov/ct2/results?cond=&term=caveolin&cntry=&state=&city=&dist=. Accessed 10 February 2020. Cav-1, caveolin-1; HER2, human epidermal growth factor 2; ER, estrogen receptor; PR, progesterone receptor; MCT4, monocarboxylate transporter 4.

As a potential drug, Cav-1 is being tested in a form of a peptide-mimetic in a US randomized, double-blind, placebo-controlled trial (NCT04233814) that is starting phase 1 in 2020. The trial will assess the initial safety, tolerability, and pharmacokinetic profile of inhaled LTI-03, a Cav-1 scaffold protein–derived 7-amino acid peptide (LTI-03) in healthy participants. The results will guide any future clinical development of LTI-03 for the treatment of idiopathic pulmonary fibrosis.

Other trials are evaluating caveolin as a prognostic biomarker of therapy response in gynaecologic cancers (NCT02874430), breast cancer (NCT01878695, NCT01746225, NCT02701348 NCT00371254), and gastric adenocarcinoma (NCT01641783), and vascular response to hypertensive stimuli (NCT01426529).

No clinical trials that involve cavin are yet available.

Cell-penetrating-peptides (CPPs) are small amino acid sequences characterized by the ability to cross cellular membranes. In therapy, they can be useful for delivering bioactive molecules, such as CPP-mediated delivery of anti-tumoral proteins ().

Conclusion

Caveolae are complex membrane microdomains of (now better) known molecular composition, with wide tissue distribution. Two classes of proteins (caveolins and cavins) cooperate to generate a gateway involved in transduction of messages from the extracellular environment. Integrity of this gate is essential for cell signaling, metabolism, antibacterial defense, mechanoreception, and aging. Mutation or loss of caveolae proteins affects human health and may generate disease phenotypes called “caveolinopathies.” Caveolae research has only recently been oriented toward translational potential, with several clinical trials to investigate their role as prognostic biomarkers in tumors. Although various cell types (prokaryotic cells, parasitic cells, tumor cells) have learned how to hijack them, we still need to learn how to exploit caveolae and their proteins for our own therapeutic purposes.

Statements

Author contributions

MD and EC collected data and drafted the manuscript. CT critically revised the manuscript. MG acquired EM images and prepared the Figures 1, 2. A-ME and MH performed study conception and design, and addressed all revisions. All authors contributed to the article and approved the submitted version.

Funding

This work was supported by the Romanian Ministry of Education and Research (MEC) under grants no. PN 1N/2019_19.29.01.04 and no. 7PFE/2018.

Acknowledgments

We would like to acknowledge Radu Huica and Lucian Albulescu for early data gathering and valuable input.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Abbreviations

  • A-MLV

    Murine leukemia virus (Retroviridae)

  • ARV

    Avian reovirus (Reoviridae)

  • BKV

    BK virus (Polyomaviridae)

  • CrCov

    Canine respiratory coronavirus (Coronaviridae)

  • CSFV

    Classical swine fever virus (Flaviviridae)

  • EBOV

    Ebolavirus (Filoviridae)

  • EHV

    Equine herpesviruses (Herpesviridae)

  • EV1

    Echovirus type 1 (Picornaviridae)

  • EV-71

    Enterovirus type 71 (Picornaviridae)

  • FMDV

    Foot-and-mouth disease virus (Picornaviridae)

  • GCRV

    Grass carp reovirus (Reoviridae)

  • HadV-C

    Human mastadenovirus-C (Adenoviridae)

  • HadV-D

    Human mastadenovirus-D (Adenoviridae)

  • HBV

    Hepatitis B virus (Hepadnaviridae)

  • HCoV-229E

    Human coronavirus (HCoV) 229E (Coronaviridae)

  • HcoVO-C43

    Human betacoronavirus OC43 (Coronaviridae)

  • HPV-31

    Human papillomavirus type 31 (Papillomaviridae)

  • ISKNV

    Infectious spleen and kidney necrosis virus (Iridoviridae)

  • IVB

    Infectious bronchitis virus (Coronaviridae)

  • JEV

    Japanese encephalitis virus (Flaviviridae)

  • MARV

    Marburg virus (Filoviridae)

  • MDRV

    Muscovy duck reovirus (Reoviridae)

  • MpyV

    Mouse polyomavirus (Polyomaviridae)

  • PEDV

    Porcine epidemic diarrhea virus (Coronaviridae)

  • PPRV

    Peste des petits ruminants virus (Paramyxoviridae)

  • Reovirus

    Reovirus (Reoviridae)

  • RSV

    Respiratory syncytial virus (Paramixoviridae)

  • RVFV

    Rift Valley fever virus (Phenuiviridae)

  • SV40

    simian virus 40 (Polyomaviridae)

  • TGEV

    transmissible gastroenteritis virus (Coronaviridae)

  • TVF

    tiger frog virus (Iridoviridae).

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Summary

Keywords

caveolae, caveolins, cell communication, cell signaling, gatekeeper, hijack, oncogenic signal, clinical trials

Citation

Dudãu M, Codrici E, Tanase C, Gherghiceanu M, Enciu A-M and Hinescu ME (2020) Caveolae as Potential Hijackable Gates in Cell Communication. Front. Cell Dev. Biol. 8:581732. doi: 10.3389/fcell.2020.581732

Received

09 July 2020

Accepted

08 October 2020

Published

27 October 2020

Volume

8 - 2020

Edited by

Jiri Novotny, Charles University, Czechia

Reviewed by

Cedric M. Blouin, Institut Curie, France; Brett Collins, University of Queensland, Australia; Ivan Robert Nabi, University of British Columbia, Canada

Updates

Copyright

*Correspondence: Ana-Maria Enciu,

These authors share first authorship

This article was submitted to Signaling, a section of the journal Frontiers in Cell and Developmental Biology

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All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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