Extracellular Matrix Signals as Drivers of Mitochondrial Bioenergetics and Metabolic Plasticity of Cancer Cells During Metastasis
Félix A. Urra1,2* 
Sebastián Fuentes-Retamal1,2 Charlotte Palominos1,2 Yarcely A. Rodríguez-Lucart2,3 Camila López-Torres1,2 Ramiro Araya-Maturana2,3- 1Laboratorio de Plasticidad Metabólica y Bioenergética, Programa de Farmacología Molecular y Clínica, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
- 2Network for Snake Venom Research and Drug Discovery, Santiago, Chile
- 3Instituto de Química de Recursos Naturales, Universidad de Talca, Talca, Chile
The role of metabolism in tumor growth and chemoresistance has received considerable attention, however, the contribution of mitochondrial bioenergetics in migration, invasion, and metastasis is recently being understood. Migrating cancer cells adapt their energy needs to fluctuating changes in the microenvironment, exhibiting high metabolic plasticity. This occurs due to dynamic changes in the contributions of metabolic pathways to promote localized ATP production in lamellipodia and control signaling mediated by mitochondrial reactive oxygen species. Recent evidence has shown that metabolic shifts toward a mitochondrial metabolism based on the reductive carboxylation, glutaminolysis, and phosphocreatine-creatine kinase pathways promote resistance to anoikis, migration, and invasion in cancer cells. The PGC1a-driven metabolic adaptations with increased electron transport chain activity and superoxide levels are essential for metastasis in several cancer models. Notably, these metabolic changes can be determined by the composition and density of the extracellular matrix (ECM). ECM stiffness, integrins, and small Rho GTPases promote mitochondrial fragmentation, mitochondrial localization in focal adhesion complexes, and metabolic plasticity, supporting enhanced migration and metastasis. Here, we discuss the role of ECM in regulating mitochondrial metabolism during migration and metastasis, highlighting the therapeutic potential of compounds affecting mitochondrial function and selectively block cancer cell migration.
Introduction
Currently, it is known that the activation of oncogenes such as c-Myc, Oct, and K-Ras (Jose et al., 2011; Hu et al., 2012; Sancho et al., 2015) and cellular sensors such as mTOR, AMPK, and HIF1α participate in the metabolic adaptations that support the primary tumor growth (Massagué and Obenauf, 2016; Valcarcel-Jimenez et al., 2017; Desbats et al., 2020; Moldogazieva et al., 2020); however, how the cancer metabolism changes during metastasis remain less well known. During the initiation of metastatic cascade, cancer cells interact with the extracellular matrix (ECM) through cell surface receptors (e.g., integrins). The ECM is composed of collagens, proteoglycans, and glycoproteins (such as laminin, fibronectin, elastin, and tenascins). Tumor-associated ECM is dynamically modified by matrix metalloproteases (MMP), producing alterations of tissue stiffness, porosity, and organization (Lu et al., 2012), being biochemically and mechanically different to normal ECM (Pickup et al., 2014). These abnormal changes in ECM promote cellular transformation and metastasis, facilitate tumor associated angiogenesis and inflammation, and determine the chemotherapy efficacy (Lu et al., 2012; Northcott et al., 2018; Deville and Cordes, 2019).
For initiating migration, cancer cells depend on their metabolic plasticity for adapting the energy production according to changes in ECM (Lipinski et al., 2016), in which mitochondria take over a crucial role for supporting metastasis formation (Scheid et al., 2021; Zanotelli et al., 2021; Figures 1A,B). In this review, we discuss the role of ECM components and ECM mechanical changes in regulating metabolic plasticity and mitochondrial bioenergetics in migration and metastasis.
Figure 1. Extracellular matrix signals induce metabolic plasticity for increasing the mitochondrial bioenergetics of cancer cells during the metastastic cascade. (A,B) Differential metabolic phenotypes between proliferating and migrating cancer cells. PGC-1α has been recognized as an essential regulator of the metabolic shifts that support metastasis. (C) Mitochondrial adaptations driven by ECM components and mediated by integrin and FAK signaling in cancer cells. (D) Adaptations of mitochondrial bioenergetics driven by ECM stiffness in migrating cancer cells. Abbreviations: OXPHOS, oxidative phosphorylation; OCR, oxygen consumption rate; Δψm, mitochondrial membrane potential; pCr, phosphocreatine; CK, creatine kinase; mt-CK, mitochondrial creatine kinase; and NAA, N-acetylaspartate.
Metabolic Plasticity During Metastasis: Role of Mitochondrial Bioenergetics
Upon metabolic stress, energy demands are supplied through dynamic changes in the metabolism. This process, known as metabolic plasticity, allows cancer cells to remodel the energy-producing pathways [e.g., metabolic shifts between glycolysis versus oxidative phosphorylation (OXPHOS)], preference of mitochondrial oxidable substrates (e.g., pyruvate, glutamine versus fatty acid), and synthesis of intermediates of the tricarboxylic acid (TCA) cycle (e.g., induction of reductive carboxylation versus oxidative decarboxylation), which depend on changes of substrate availability, such as oxygen, glucose, and amino acids (Urra et al., 2016b). To metastasize, cancer cells must perform metabolic adaptations to detachment from ECM, local migration and invasion, intra- and extra-vasation in blood, local invasion to into secondary sites, and formation of a secondary tumor (Celià-Terrassa and Kang, 2016; Scheid et al., 2021).
The resistance to detachment-induced cell death (anoikis) and overcoming the growth signals received through their attachment to ECM are important markers for the initial steps of metastasis (Simpson et al., 2008). Under anoikis, a metabolic remodeling toward increased pyruvate utilization promotes the migration of highly invasive ovarian cancer cells (Caneba et al., 2012). In line with this, under metabolic stress, AMPK promotes the PDH activity, which catalyzes pyruvate to acetyl-CoA, maintaining the influx of substrates for TCA cycle functioning, supporting a metastatic phenotype (Cai et al., 2020). This correlates with high glutamine consumption for mitochondrial ATP synthesis (Yang et al., 2014; Fiorillo et al., 2021). Consequently, the inhibition of mitochondrial function reduces the invasive capacity of these cancer cells (Kim and Wirtz, 2011; Caneba et al., 2012; Yang et al., 2014). Besides, cancer cells manage redox homeostasis and growth using reductive carboxylation dependent on glutamine-derived α-ketoglutarate (α-KG), while adapting to an anchorage-independent phenotype (Jiang et al., 2016).
After escape from the primary tumor mass and intravasation, circulating cancer cells rewire their metabolism to survive, controlling the mitochondrial reactive oxygen species (mtROS) scavenging (Elia et al., 2018). Recently, differential utilization of glycolysis and OXPHOS between proliferating and migratory/invasive cancer cells has highlighted the participation of mitochondria during metastasis. Invasive cancer cells use the transcription coactivator peroxisome proliferator-activated receptor gamma, coactivator 1 alpha (PPARGC1A, also known as PGC-1α) to enhance mitochondrial biogenesis and OXPHOS, being an essential event for functional motility and metastasis in breast cancer cells (LeBleu et al., 2014). In addition, subpopulations of cancer cells able to generate metastasis require a high production of mitochondrial superoxide (Porporato et al., 2014), which is obtained by an exaggerated TCA cycling (Porporato and Sonveaux, 2014; Porporato et al., 2014). The PGC1a-driven metabolic adaptations with increased OXPHOS are essential to tumorigenesis, showing a positive influence on metastasis in several cancers, such as breast (Cai et al., 2016; Luo et al., 2016b; Andrzejewski et al., 2017; Pacheco-Velázquez et al., 2018), hepatocellular (Li et al., 2016), colorectal (Yun et al., 2019), endometrial (Chen et al., 2020), prostate (Tennakoon et al., 2014), pancreatic cancers (Sancho et al., 2015), and in some models of melanoma (Vazquez et al., 2013). Despite the above, the PGC-1α overexpression decreases cellular invasiveness in prostate and melanoma (Luo et al., 2016a; Torrano et al., 2016), showing that the link between increased PGC-1α expression, mtROS, and metastasis still remains controversial and suggests specific roles in tumorigenesis dependent on cancer type (LaGory et al., 2015; Piskounova et al., 2015; Liu et al., 2017).
Mitochondrial ATP and ROS are essentials for supporting metastatic signaling (Lu et al., 2012; LeBleu et al., 2014; Porporato et al., 2014; Ryu et al., 2020). A controlled mtROS increase triggers an invasive behavior by stimulating Src signaling, which in turn induces pyk2 expression, a tyrosine kinase of the FAK family involved in cytoskeletal remodeling and migration (Du et al., 2001). In the same line, Src increases the metabolic status of metastatic cells by phosphorylation of residues of respiratory complexes, enhancing the activities of the electron transport chain (ETC) and the PFKFB3 complex, leading to an increase of the fluxes of glycolysis, non-oxidative pentose phosphate pathway and TCA cycle (Ma et al., 2020).
Recent reports highlight the key role of α-KG in the metabolic shifts that promote metastasis (Elia et al., 2018). α-KG is synthesized from pyruvate oxidation or glutaminolysis and metabolized by α-ketoglutarate dehydrogenase (Armstrong et al., 2014), which is essential for cancer proliferation and survival under hypoxia and OXPHOS dysfunction (Burr et al., 2016; Vatrinet et al., 2017; Cardenas et al., 2020). Increased α-KG levels trigger a strong epigenetic reprogramming that enhances the adaptation of cancer cells to a hostile environment through the activation of histone and/or DNA demethylases (Rinaldi et al., 2018). Beyond the essential role of glutaminolysis in proliferation by supporting the nucleotide synthesis (Metallo et al., 2012; Mullen et al., 2012), glutamine regulates the MMP expression dependent on the oncogenic transcription factor ETS1, which triggers an invasive phenotype by a not fully elucidated mechanism (Prasad and Roy, 2021). Finally, cancer cells that reach a distant organ, they colonize the new environment, establishing new cell-matrix interaction, ECM remodeling, and micrometastasis formation in a bioenergetics-dependent manner (Elia et al., 2018; Schild et al., 2018; Scheid et al., 2021). In particular, breast cancer cells colonizing lungs utilize the proline cycle to obtain FADH2, which can be oxidized by ETC to produce mitochondrial ATP (Elia et al., 2017). In addition, the metastasizing breast and oral squamous cancer cells have high bioenergetics plasticity to support ATP synthesis by glycolysis and fatty acid-dependent OXPHOS, suggesting an selective rewiring of energy substrate preference (Andrzejewski et al., 2017; Pascual et al., 2017). Therefore, different mitochondria-dependent metabolic adaptations occur during migration, invasion, and colonization; however, they all converge to supply mitochondrial ATP production, revealing an essential role of bioenergetics in metastasis.
Extracellular Matrix Components That Modulate the Mitochondrial Bioenergetics in Metastasis
The migration of cancer cells through the extracellular matrices requires cell-ECM interactions mediated by non-collagenous ECM glycoproteins fibronectin and laminin (Parsons et al., 2010). These two ECM glycoproteins bind specific collagens and proteoglycans, interacting with integrin receptors in the plasma membrane of cancer cells. Integrins are heterodimers of type 1 membrane-spanning glycoproteins composed of one α and one β subunit, interacting with the ECM to produce a dynamic link between the extracellular adhesion molecules and the intracellular actin cytoskeleton, thereby promoting intracellular signaling cascades (Blandin et al., 2015). The aggregation of ECM proteins, integrins, cytoskeletal proteins, and signaling kinases form structures known as focal adhesion complexes (Parsons et al., 2010). The integrin ligation and clustering activate focal adhesion kinase (FAK), which in-turn activates Src-family kinases and this increases downstream pathways for promoting survival and motility, contributing to metastasis (Cance et al., 2000; Lark et al., 2005; Mitra and Schlaepfer, 2006).
Activation of integrin signaling controls the metabolism, promoting metabolic shifts that support migration and metastasis (Figure 1C). Osteopontin is a small N-linked glycoprotein that binds αvβ3 integrin. This interaction reduces the mitochondrial membrane potential (Δψm) and oxygen consumption rate (OCR), producing a metabolic shift toward glycolysis that supports migration and growth in glioblastoma cells (Che et al., 2021). This integrin-dependent metabolic shift is mediated by FAK/protein arginine methyltransferase 5 activation (Che et al., 2021). Notably, contrary effects of other integrin ligands such as vitronectin, laminin, and fibronectin have been described for stimulating the mitochondrial function, increasing the maximum reserve and respiratory capacity in endothelial cells by STAT3 activation. Integrin ligands induce STAT3 translocation to mitochondria for stimulating OXPHOS function (Visavadiya et al., 2016) and recently, was described that ECM-integrin-FAK-STAT3 signaling promotes migration in cancer cells (Yang et al., 2021). This indicates a possible differential metabolic regulation by ECM in migrating cells.
The Rho family of small GTPases integrates ECM-integrin signals for controlling cell cycle progression, migration, and actin cytoskeleton dynamics, which are relevant during metastasis (Phuyal and Farhan, 2019). Notably, some small GTPases participate in the mitochondrial fission during intrinsic apoptosis and mitophagy (Hammerling et al., 2017), and glutamine metabolism (Dorai et al., 2016). RhoC promotes glutamine uptake for maintaining α-KG-dependent reductive carboxylation in SUM149 cells, an inflammatory breast cancer model. SUM149 cells exhibit metabolic abnormalities such as high aerobic glycolysis, low mitochondrial respiratory capacity, and a large reductive carboxylation flux from glutamine-derived α-KG to citrate under normal culture conditions, which are supported by RhoC (Wynn et al., 2016). N-acetylaspartate (NAA), a storage metabolite for acetate, is synthesized from aspartate and acetyl-CoA by aspartate-N-acetyltransferase (Asp-NAT) or via hydrolysis of N-acetyl-aspartylglutamate. RhoC promotes the NAA production in SUM149 cells by regulation of Asp-NAT levels. Since the changes in the tumoral microenvironment may determine nutrient shortage, NAA storage may help promote survival and to accommodate varying nutritional needs during the diverse steps of the metastatic process (Wynn et al., 2016).
Regulatory mechanisms of mitochondrial distribution mediated by β1-integrin have been described for highly invasive cancer cells. Upon integrin recycling, the small GTPase Arf6 promotes an AMAP1–ILK signaling pathway essential for the formation of mature focal adhesions in invasive cancer cells. This blocks the RhoT1-TRAK2 association, reducing the mitochondrial retrograde trafficking without changes in the mitochondrial mass and OCR, and favoring collagen I-stimulated cell invasion (Onodera et al., 2018). In migrating ovarian cancer cells, lamellipodia have increased local mitochondrial mass, elevated OCR, and relative ATP concentration. Notably, this is dependent on an increased pseudopodial AMPK activity that maintains the cytoskeletal dynamics, migration, and the invasion of three-dimensional ECM (Cunniff et al., 2016). Consistent with this, mitochondrial Rho GTPase (Miro1) involved in the mitochondrial trafficking, also controls the ATP/ADP ratio at the cortex, promoting lamellipodia protrusion and membrane ruffling in migrating cells (Schuler et al., 2017). Collectively, this evidence suggests that local mitochondrial accumulation in the leading edge lamellipodia has bioenergetics implications in migrating cancer cells by supporting membrane protrusion and focal adhesion stability.
Mechanosignalings From Extracellular Matrix That Modulate the Mitochondrial Bioenergetics and Metabolism Plasticity During Metastasis
During metastatic dissemination, cancer cells adapt to structurally and mechanically different ECM in the primary tumor. The ECM remodeling in a tumor is characterized by increased ECM deposition, fiber alignment, and crosslinking, modifying the stiff tumor microenvironment. This promotes active cancer progression and metastasis increased by integrin signaling (Egeblad et al., 2010; Winkler et al., 2020). Unlike normal tissue, several solid cancers exhibit a more ECM stiffness (Kawano et al., 2015) and have dense and align collagen fibers, which favor the exit of migrating cancer cells from the primary tumor (Provenzano et al., 2006, 2008).
During microenvironment transitions with variations on mechanical cues, migrating cancer cells regulate the metabolism for supplying the energetic needs (Papalazarou et al., 2020; Zanotelli et al., 2021; Figure 1D). Stiff ECM promotes mitochondrial fusion by activation of β1-integrin/kindlin-2 (an integrin-binding protein) signaling (Chen et al., 2021). In this condition, concomitantly occurs the activation of a signaling by β1-integrin/PINCH-1, a focal adhesion protein whose level is increased in response to ECM stiffening, decreasing DRP1 GTPase expression and mitochondrial fission (Chen et al., 2021). Conversely, soft ECM induces up-regulation of DRP1 expression and mitochondrial fission, reducing the spreading of cancer cells (Chen et al., 2021). Although DRP1 knockdown prevents the ECM softening-induced mitochondrial fission, it lacks effects on spreading, suggesting that other molecular components may participate in this signaling. Moreover, details on the impact of mitochondrial bioenergetics during migration mediated by β1-integrin/PINCH-1 or β1-integrin/kindlin-2 remain unknown. A possible link of this signaling to mitochondrial metabolism may be the reprogramming of proline metabolism, which is critical for tumor growth. PINCH-1, highly expressed in lung adenocarcinoma, promotes proline synthesis through the regulation of mitochondrial dynamics. Knockout of PINCH-1 increases DRP1 expression and mitochondrial fragmentation, which suppresses kindlin-2 mitochondrial translocation, and interaction with pyrroline-5-carboxylate reductase 1, resulting in inhibition of proline synthesis and cancer cell proliferation (Guo et al., 2019, 2020).
Mechanical regulation of cytoskeletal remodeling during spreading and migration involves a metabolic shift toward increased OXPHOS, which is necessary for membrane ruffling in breast cancer cells (Wu et al., 2021). Under ECM stiffness, the high energy demand is supplied by the phosphocreatine (pCr)–creatine kinase (CK) system in pancreatic ductal adenocarcinoma (PDAC) cells. PDAC is associated with extensive matricellular fibrosis and more aggressiveness (Bailey et al., 2016; Tian et al., 2019; Papalazarou et al., 2020). In these cells, K-RAS activating mutations drive high metabolic plasticity, conferring adaptive metabolic mechanisms for consuming alternative energy sources (Kerr et al., 2016). A metabolic remodeling induced by a stiffer matrix has been described for PDAC cells which supports migration and metastasis. In matrix stiffness, PDAC cells shunt L-arginine toward the creatine biosynthesis pathway, increasing the ATP turnover and pCr reaction by CK (Papalazarou et al., 2020). The high pCr-CK activity promotes elongated mitochondria, increasing mitochondrial mass and Δψm to support ATP production by OXPHOS (Papalazarou et al., 2020). Remarkably, this mitochondrial subpopulation enriches the pseudopods of PDAC cells invading the ECM.
In solid tumors, collaborative metabolic shifts between stroma and epithelial cell populations maintain a continuous supply of energetic substrates (Martinez and Smith, 2021). Cancer-associated fibroblasts (CAFs) secrete lactate, which increases mitochondrial mass and activity by SIRT1-dependent PGC-1α activation in cancer cells and promotes mitochondrial transfer from CAF (Ippolito et al., 2019). Moreover, increased ECM stiffness stimulates the expression of stromal glucose transporter Glut1 and monocarboxylate transporters MCT4, increasing lactate production and glucose uptake by mammary fibroblasts (Ponce et al., 2021). In this condition, mammary stromal cells generate soluble factors that stimulate epithelial breast migration in a stiffness-dependent manner (Ponce et al., 2021). Moreover, tumor niche stiffening induces a differential switch in amino acid metabolism involving a change in carbon fluxes in cancer and stromal cells (Bertero et al., 2019). In CAFs, ECM stiffness promotes aspartate synthesis from glutamine-derived carbon and glutamate synthesis from glutamine-derived carbon in cancer cells, failing to fill the TCA cycle and aspartate synthesis (Bertero et al., 2019). Differential roles of these amino acids in CAF and cancer cells have been described. Aspartate promotes cancer cell proliferation by participating in the nucleotide biosynthesis pathway, while glutamate feeds the glutathione synthesis for controlling intratumorally redox homeostasis. Notably, co-targeting of glutaminase and the aspartate/glutamate transporter SLC1A3 in tumors blocks cancer progression and metastasis in vivo (Bertero et al., 2019). Therefore, this evidence suggests new anticancer strategies that can overcome the ECM mechanosignalings-driven metabolic adaptations in solid tumors.
Migrastatic Agents That Promote Mitochondrial-Extracellular Matrix Disruption in Cancer Cells
Although the metastasis is the main cause of death in patients (Riggi et al., 2018), the current chemotherapy regimens only target the tumor growth, lacking the inhibitory effects on the ability of cancer cells to invade and execute metastasis (Gandalovičová et al., 2017; Riggi et al., 2018). This highlights the need to search for novel anti-metastatic pharmacological approaches (Gandalovičová et al., 2017; Riggi et al., 2018). Migrastatic drugs have been defined as selective inhibitors of metastatic abilities with non-cytotoxic effect (Gandalovičová et al., 2017). Although some migrastatic actions of cytotoxic compounds are reported, those effects can be attributed to the induced cell death, because the direct link between migration and mitochondrial dysfunction has been not established (Song et al., 2017; Yan et al., 2017; Dong et al., 2018; Yang et al., 2018; Cheng et al., 2019; Luo et al., 2019; Gupta et al., 2021; Liu et al., 2021). Table 1 shows recent compounds reported with migrastatic effects by induction of mitochondrial dysfunction at non-cytotoxic concentrations.
Table 1. Mitochondria-affecting compounds with migrastatic effect.
Many phenolic compounds affect the mitochondrial bioenergetics, by inhibiting ETC and/or by OXPHOS uncoupling (Urra et al., 2013, 2016a, 2021; Donoso-Bustamante et al., 2020; Fuentes-Retamal et al., 2020), with different consequences on viability and proliferation of cancer cells (Urra et al., 2016b, 2017). Factors such as the degree of inhibition of ETC activity, bioenergetic profile, and metabolic plasticity of different cancer types, or subpopulations of cells in a particular cancer type, determine the anti-cancer actions (McGuirk et al., 2013; Lehuédé et al., 2016; Urra et al., 2016b). A hydroquinone derivative, named FR58P1a (Table 1), selectively uncouples OXPHOS, through a protonophoric mechanism, without exhibiting the known off-target effect on the plasma membrane potential of canonical protonophores such as FCCP and CCCP (Juthberg and Brismar, 1997; Buckler and Vaughan-Jones, 1998; Park et al., 2002). The FR58P1a-induced mitochondrial dysfunction activates the SIRT1/AMPK axis, leading to selective inhibition of fibronectin-dependent adhesion and migration by decreasing β1-integrin at the cell surface in triple-negative breast cancer (TNBC) cells (Urra et al., 2018). The prolonged migrastatic effect of FR58P1a triggers a metabolic shift toward glycolysis and mitophagy (Urra et al., 2018). The polyphenolic flavonoid silibinin promotes mitochondrial fission and impairs mitochondrial biogenesis, reducing migration and invasion of TNBC cells by reduction of epithelial to mesenchymal transition (EMT) markers (Hamarsheh and Zeiser, 2020). Since inflammation promotes tumor metastasis and can be triggered by activating the NLRP3 inflammasome via ROS-dependent mitochondrial damage (Hamarsheh and Zeiser, 2020), the silibinin-induced mitochondrial fission inhibits NLRP3 inflammasome activation and migration possibly by an antioxidant mechanism (Hamarsheh and Zeiser, 2020). Instead, IR-783 induces mitochondrial fission and a subsequent ATP drop, thereby decreasing polymerized filamentous actin, a fundamental component of filopodia at the cell surface (Hamarsheh and Zeiser, 2020).
Interestingly, several toxins isolated from snake venom exhibit selective migrastatic effects in cancer cells by interaction with integrin receptors, alterations in the actin/cytoskeleton network, and EMT inhibition (Urra and Araya-Maturana, 2017, 2020). The recently identified snake toxin pictobin induces mitochondrial fragmentation and dysfunction (Table 1), inhibiting the migration in cancer cells at non-cytotoxic concentrations (Vivas-Ruiz et al., 2020). In analogy to the effects of human thrombin on mitochondrial metabolism in platelets (Ravi et al., 2015), pictobin-induced mitochondrial dysfunction may be triggered by intracellular signaling initiated in the plasma membrane by cleavage of some receptor in cancer cells (Vivas-Ruiz et al., 2020). Taking these selected examples, mitochondrial fragmentation, and bioenergetics inhibition may represent an attractive mechanism for new anti-metastatic approaches that interfere with the extracellular cues-metabolism communication.
Future Perspective and Conclusion
Although the determinants that lead to metabolic adaptation during dissemination and metastasis are not fully elucidated, there are common factors that link a phenotype dominated by OXPHOS, glutamine consumption and increased mtROS production in cancer cells to greater migratory and invasive potential (Porporato et al., 2014; Yang et al., 2014; Valcarcel-Jimenez et al., 2017; Davis et al., 2020). In migrating cancer cells, ECM composition and stiffness are drivers for metabolic shifts toward enhanced mitochondrial bioenergetics and local mitochondrial accumulation in the leading edge lamellipodia. This showcases mitochondria as an attractive pharmaceutical target putatively preventing cancer metastasis. Since ECM stiffness produces collapse of blood vessels in tumors (Padera et al., 2004; Primeau et al., 2005) and it impairs the abilities to deliver drugs to cancer cells (Gade et al., 2009), new drug candidates as migrastatics will require to consider these factors for obtaining in vivo efficacy.
Author Contributions
FU designed and outlined the structure and contents of the review. FU, SF-R, CP, CL-T, YR-L, and RA-M contributed to the literature review, discussion, and writing of the manuscript. All authors contributed equally to the draft revisions and final approval of the version to be published.
Funding
This work was funded by FONDECYT grants #1180069 (RA-M), #11201322 (FU), and VID-University of Chile #UI-024/20 (FU). CP and SF-R thank ANID for Master (#22191223) and postdoctoral (#3210667) fellowships, respectively.
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.
Publisher’s Note
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Keywords: OXPHOS (oxidative phosphorylation), integrin, TCA cycle, ECM stiffness, migrastatics, migrating cancer cells, metabolic shift
Citation: Urra FA, Fuentes-Retamal S, Palominos C, Rodríguez-Lucart YA, López-Torres C and Araya-Maturana R (2021) Extracellular Matrix Signals as Drivers of Mitochondrial Bioenergetics and Metabolic Plasticity of Cancer Cells During Metastasis. Front. Cell Dev. Biol. 9:751301. doi: 10.3389/fcell.2021.751301
Received: 31 July 2021; Accepted: 28 September 2021;
Published: 18 October 2021.
Edited by:
Tanja Nicole Hartmann, University of Freiburg Medical Center, GermanyReviewed by:
Julia Christine Gutjahr, Queen Mary University London, United KingdomOlga Vagin, UCLA David Geffen School of Medicine, United States
Copyright © 2021 Urra, Fuentes-Retamal, Palominos, Rodríguez-Lucart, López-Torres and Araya-Maturana. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Félix A. Urra, felixurraf@u.uchile.cl