Mechanisms of Infectivity and Evasion Derived from Microvesicles Cargo Produced by Trypanosoma cruzi
Bruna C. Borges1,2* 
Isadora A. Uehara1 
Laysa O. S. Dias1 
Paula C. Brígido2 
Claudio V. da Silva2 
Marcelo J. B. Silva1- 1Laboratório de Osteoimunologia e Imunologia dos Tumores, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, Brazil
- 2Laboratório de Tripanossomatídeos, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Uberlândia, Brazil
Cell invasion by the intracellular protozoans requires interaction of proteins from both the host and the parasite. Many parasites establish chronic infections, showing they have the potential to escape the immune system; for example, Trypanosoma cruzi is an intracellular parasite that causes Chagas disease. Parasite internalization into host cell requires secreted and surface molecules, such as microvesicles. The release of microvesicles and other vesicles, such as exosomes, by different eukaryotic organisms was first observed in the late twentieth century. The characterization and function of these vesicles have recently been the focus of several investigations. In this review, we discuss the release of microvesicles by T. cruzi. The molecular content of these vesicles is composed of several molecules that take place during parasite-host cell interaction and contribute to the parasite-driven mechanism of evasion from the host immune system. These new findings appear to have a profound impact on the comprehension of T. cruzi biology and highlight novel potential strategies for developing more efficient therapeutic approaches.
Key points
• Exosomes cargo promotes Trypanosoma cruzi cell invasion and evasion from host immune response.
• Exosomes cargo derived from Trypanosoma cruzi modulates the content of host cell-derived exosomes.
Introduction
Chagas' disease is an anthropozoic vector-borne parasitic infection, caused by the protozoan parasite, Trypanosoma cruzi. There are about six to seven million people infected in Latin America and approximately 25 million people living in areas with potential risk for infection. About 10,000 people die from the disease each year worldwide (WHO, 2015). The migration of infected individuals to non-endemic countries turned Chagas' disease into an emerging worldwide public health problem (Coura and Viñas, 2010; Álvarez et al., 2014).
Trypanosoma cruzi is a heterogeneous flagellate parasite, and its populations are characterized by a diverse morphology, heterogeneous biological behavior, high genetic variability, and distinctly different clinical courses (Macedo and Pena, 1998). The clonal-histotrophic model of Chagas' disease describes a correlation between the clonal-population structure of T. cruzi and its tissue tropism, and it explains the variety shown by this parasite (Macedo et al., 2004). It is now accepted that T. cruzi strains can be divided into six discrete typing units (DTUs), T. cruzi I to VI (Zingales et al., 2009).
Exosomes are formed within the endolysosomal network. The generation is initiated upon the endocytosis of extracellular material in the early endosome that results in multivesicular body (MVBs) formation. This compartment, also termed late endosome, has various intraluminal vesicles, which may degrade the cargo content or be secreted to the extracellular milieu as exosomes (Harding et al., 1983; Pan et al., 1985; Mantel and Marti, 2014). Exosomes contain specific proteins involved in vesicle formation and specific markers of the endosomal pathway, such as members of the Rab GTPase family, chaperones and tetraspanins (Ostrowski et al., 2010). Some have suggested extracellular vesicles (EVs) have a role in disease outcome, such as cancer, and physiological regulation because several infectious conditions lead to an increase in EVs in the body fluids of patients (Minciacchi et al., 2015). Some pathogenic organisms are capable of releasing exosomes, for example, the fungus Cryptococcus neoformans (Rodrigues et al., 2008), Leishmania major (Silvermann et al., 2010), and Trypanosoma cruzi (Bayer-Santos et al., 2013). EVs from eukaryotic parasites can be secreted from extracellular pathogens or produced by host cells infected by intracellular pathogens (Twu and Johnson, 2014). The EVs can mediate parasite-parasite and host-parasite interactions. Infected cell-derived exosomes enable communication between distant parasites and facilitate the spreading of virulence factors (Mantel and Marti, 2014).
Some authors have shown plasma membrane and flagellar pocket from T.cruzi epimastigote forms release vesicles, which comprise glycoproteins, glycolipids, and glycopeptides of the parasite surface (Da Silveira et al., 1979). T. cruzi can produce exosomes that stimulate host cells to produce EVs, in particular monocytes and lymphocytes, to modulate the host immune response (Cestari et al., 2012; Mantel and Marti, 2014). Later, in this sense, authors have found trypomastigote produces exosomes that contain surface components, like glycoproteins, such as gp85/transialidases, alphaGal-containing molecules, proteases, cytoskeleton proteins, mucins, and associated to GPI (glycosylphospatidylinositol)-anchored molecules. Besides proteins, small RNA in exosomes from T. cruzi has been reported, including tRNA, which were actively secreted to the extracellular medium and acted as vehicles for transferring these molecules to other parasites and to mammalian cells (Bayer-Santos et al., 2014).
Based on these results, intriguing questions may be raised: Why does the parasite shed these components? Would these exosomes play any role in the pathogenesis of Chagas disease or the evasion of parasite from the immune system? How would they modulate infection? These are the main topics of this article.
Invasion Mechanism of Trypanosoma cruzi
In the past decades, many laboratories have attempted to identify surface and secreted components of T. cruzi implicated in host-cell invasion, which consists of a multi-step process involving various parasite and host-cell molecules. To invade mammalian cells, some surface glycoproteins present in metacyclic trypomastigotes, such as gp82, gp35/50 or gp30, known as a gp82 variant expressed in gp82-deficient isolates, trigger events that lead to intracellular Ca2+ mobilization in both parasite and host cell (Burleigh and Andrews, 1998; Yoshida and Cortez, 2008). These parasites may also take advantage of secreted components, such as proteins from the SAP (serine-, alanine and proline-rich proteins) family; these proteins have a central domain (SAP-CD) responsible for invasion of mammalian cells by metacyclic forms (Baida et al., 2006; Zanforlin et al., 2013). Tissue culture-derived trypomastigotes (TCTs) have components, such as Tc-85, gp83, Tc-1, cruzipain, oligopeptidase B, and POP Tc80, that traverse the extracellular matrix and invade host cells (Burleigh and Andrews, 1998; Yoshida and Cortez, 2008). Through the surface molecules of gp85/transialidase superfamily, the parasites bind to fibronectin/laminin (Ouaissi et al., 1986; Giordano et al., 1994) and pave the way for the action of enzymes, such as the serine protease POP Tc80 that hydrolyses collagen (Santana et al., 1997; Grellier et al., 2001). Upon encountering the target cells, trypomastigotes attach to them in a manner mediated by Tc-85 (Alves et al., 1986), gp 83 (Villalta et al., 2001), or Tc-1 (Augustine et al., 2006). This interaction induces the activation of oligopeptidase B (Burleigh and Andrews, 1995; Caler et al., 1998) that generates a calcium-signaling factor from a precursor molecule. Alternatively, or simultaneously, cruzipain is secreted by attached trypomastigotes within the confines of parasite-target cell juxtaposition. Its action on the kininogen generates bradykinin, which interacts with its receptor and induces a calcium response (Scharfstein et al., 2000; Todorov et al., 2003). Calcium mobilization by all these factors inside the host cell promotes invasion. During this process, gp83 is released and can induce upregulation of laminin γ-1 expression by host cell (Kuratomi et al., 2002; Nde et al., 2006). Human galectin-3 enhances parasite adhesion to laminin (Moody et al., 2000), contributing to the pathogenesis of the disease.
After that, the protein P21 can be secreted in the parasite-target cell juxtaposition and activates a signaling cascade still unknown that leads calcium mobilization from parasite acidocalcisomes, phosphorylation of T. cruzi polypeptides (Fernandes et al., 2006), culminating in the activation of Rac1 and in membrane actin ruffles formation (Fernandes and Mortara, 2004) within microdomains enriched in cholesterol and GM1 (Fernandes et al., 2007) leading to parasite internalization. The protein P21 triggers host cell invasion by all infective forms. This protein binds to CXCR-4 receptor (Silva et al., 2009; Rodrigues et al., 2012), recruits immune cells, induces IL-4 production, and decreases blood vessels formation. This protein can be a potential target for developing novel treatment against chagasic cardiomyophaty (Teixeira et al., 2015).
During an in vivo infection, trypomastigotes present in the bloodstream can transform into extracellular amastigotes (EA), and when infected cells are ruptured, they may release intracellular amastigotes (IA). These amastigotes (EA and IA) may contribute to the infection progression by infecting cells in an actin-dependent manner, in a microenvironment context (Procópio et al., 1998, 1999). Amastigotes take advantage of carbohydrate epitopes present in Ssp-4 to attach to host cells prior to invasion (Silva et al., 2006).
The general expression of these proteins offers a potential target for novel therapies; besides inhibition of crucial biological pathways for parasite survival, the infective form appears to be a prospective strategy in specific drug discovery.
Modulation Mechanisms of Extracellular Vesicles Cargo
Approximately 367 distinct proteins were identified as cargo of secreted vesicles and exosomes produced by T. cruzi. These proteomic analyses classified those proteins into 16 categories, involving host-parasite interaction, signaling, transporters, oxidation-reduction, carbohydrate metabolism, and others (Bayer-Santos et al., 2013).
To invade host cells, T. cruzi metacyclic trypomastigote forms use distinct sets of surface and secreted molecules that interact with the host cell; some were found as cargo of microvesicles. In the past, different biological functions have been attributed to EVs (Denzer et al., 2000). Today, it is accepted that EVs represent an essential machinery for intercellular communication. Virulence factors delivery via vesicles cargo offers a potential mechanism to affect the host cells compared to simple diffusion (Mashburn-Warren and Whiteley, 2006; Rodrigues et al., 2008; Figure 1).
Figure 1. Mechanism of action by secreted proteins in vesicles. The graphical abstract shows the main proteins that are released in vesicles (TGF-β, Gp82, Gp85/TS, SAP, Cruzipain) and their mechanisms of action, which increases the parasite invasion of the host cell.
Trypanosome-secreted vesicles are associated with an inner plasma membrane leaflet protein, like flagellar calcium-binding protein (FCaBP), a-galactosyl glycoconjugates, GP35/50, and gp85/trans-sialidase superfamily (Trocoli Torrecilhas et al., 2009; Bayer-Santos et al., 2013). These compounds are important in parasite adhesion to host cells and probably have similar functions when located on secreted vesicles (Yoshida and Cortez, 2008). Also, inside extracellular vesicles, there are components with acid and alkaline phosphatase activities responsible for increased parasite adhesion and infection (Neves et al., 2014).
The nutrient starvation in epimastigotes induces the secretion of extracellular vesicles carrying small tRNAs and TcPIWI-tryp proteins as cargo. This cargo could be transferred to other parasites and to mammalian cells, increasing metacyclogenesis, and susceptibility of mammalian cells to infection (Fernandez-Calero et al., 2015).
Molecules secreted by T. cruzi into the extracellular medium may also participate in parasite internalization. The cruzipain is main cysteine protease of the T. cruzi and is present in all stages of the parasite, more abundant in replicating forms. In epimastigote, it is found in organelles similar to lysosome, the “reservosomes,” specific organelles pre-lysosomal-epimastigote, the reservosomes that are exocytic fusion of MVBs, resulting in exosomes (Bayer-Santos et al., 2013; Zanforlin et al., 2013). In amastigotes, cruzipain is associated with the plasma membrane through a GPI anchor. Other isoforms of this protein are secreted into the medium by trypomastigotes, which contributes to the virulence factor of Chagas disease (Santos, 2010; Alvarez et al., 2012). Cruzipain matures in the Golgi apparatus and is reserved in reservosomes, where it is also active. It promotes the penetration of trypomastigotes in host cells and plays an important role in the intracellular development and metacyclogenesis, in development of host immune response, and in the interaction with the insect host (Santos, 2010; Ferrão et al., 2015). This enzyme also contributes to the parasite's invasion in mammalian cells through the proteolysis of high and low molecular weight kininogen or by the activation of the cascading plasma prekallikrein conversion for active kallikrein (acting as kininogenases), then it in occurs the production of proinflammatory peptide (Lys-bradykinin), which interacts with receptors B2 (bradykinin receptor), G protein-coupled, inducing the increase of transient intracellular free calcium (Ca2+) (Del Nery et al., 1997; Scharfstein et al., 2000; Santos, 2010; Alvarez et al., 2012). The elevation of intracellular Ca2+ is one of the parasite invasion pathways leading to synaptotagmin VII-dependent migration and lysosome fusion to parasite binding site, preceding the formation of the parasitophorous vacuole (Aparicio et al., 2004). Cruzipain also works as an escape mechanism of the host immune response, because it makes digestion of “hinges” off all humans IgG subclasses (Berasain et al., 2003).
The contents of extracellular vesicles are enriched with glycoproteins of the gp85/trans-sialidase (TS) superfamily and other a-galactosyl (a-Gal) containing glycoconjugates, such as mucins; these proteins are released in different amounts, which may be determinant in the immunopathologic events not only in the early steps of infection, but also in the chronic phase (Nogueira et al., 2015). GP85/trans-sialidase has been shown as a conserved sequence or motif, called FLY, localized upstream to the C-terminal of the gp85/TS molecules. It promotes cell adhesion by binding to the intermediate filament protein cytokeratin-18 (CK18), which allows for dephosphorylation and activates ERK1/2 (extracellular signal regulated kinase) signaling cascade. This ERK1/2 cascade increases parasite entry into mammalian cells because these kinases are important for FLY binding to host cell, and consequently, in dephosphorylation of CK18 inducing redistribution and disassembly of filaments (Magdesian et al., 2006). This interaction is not limited to cytokeratin 18 (CK18), which may explain the wide variety of cells infected by the parasite (Tonelli et al., 2010).
GP82 is a cell adhesion molecule that binds to the host cell and is implicated in host-cell invasion of highly infective T. cruzi strains (Ramirez et al., 1993). The signaling cascade induced by gp82 when it binds to unknown receptors includes the participation of phospholipase C (PLC), which generates inositol triphosphate (IP3), which do Ca2+ mobilization from endoplasmic reticulum (Yoshida et al., 2000; Yoshida, 2006). This increase of intracellular Ca2+ leads to a rapid and transient reorganization of host cell microfilaments, including disassembly of the actin cytoskeleton facilitating the invasion by parasites (Dorta et al., 1995; Rodríguez et al., 1996; Ruiz et al., 1998; Martins et al., 2011).
SAP proteins are released into the extracellular medium by epimastigotes and metacyclic trypomastigotes as soluble factors or as components of secreted vesicles. The SAP-CD has regions SAP-NT (amino-terminal), SAP-CE (central), and SAP-CT (carboxy-terminal) (Baida et al., 2006). The interaction of SAP-CE fragment with host cells induce lysosome exocytosis by up-regulating calcium, probably acting synergistically with GP82 (Zanforlin et al., 2013). The lysosome exocytosis contributes to the formation of parasitophorous vacuoles (Martins et al., 2011).
Trypanosoma cruzi induce the release of exosomes from the cells they infect, such as monocytes and lymphocytes; these EVs also contain immunomodulatory cytokines, as TGF-β. This cytokine bearing this MVBs promoting enhance T. cruzi invasion leading to maturation and the continuation of the life cycle, contributing to escape the complement attack, a fact demonstrated by the inhibition of TGF-β by antibodies and receptor antagonists (Cestari et al., 2012) (Table 1).
Table 1. Microvesicles cargo and respective function.
Exosomes and Trypanosoma cruzi Infection: Do They Have Any Impact?
Antigens released via EVs are present at the parasite membrane and in the flagellar pocket before secretion by the trypomastigote (Gonçalves et al., 1991). Trocoli Torrecilhas and contributors have suggested a potential role of EVs in increase virulence by injecting them in BALB/C mice prior to infection with Trypanosoma cruzi, which leads to increase parasitaemia, and severe heart pathology and intense inflammation (Trocoli Torrecilhas et al., 2009). T. cruzi trypomastigotes produce their own EVs and can induce the production of EVs from other cells; such EVs can bind to trypomastigotes protecting them against lysis by the complement system (Cestari et al., 2012).
Both trypomastigote present in human blood and epimastigote present in the insect vector release EVs from the plasma membrane and from MVBs localized at the flagellar pocket (Bayer-Santos et al., 2013). Fractionation provided purified preparations of three fractions: the first enriched in larger vesicles resembling ectosomes, the second enriched in smaller vesicles resembling exosomes, and a third fraction enriched in soluble proteins not associated with extracellular vesicles. These data demonstrate a rich collection of proteins involved in the metabolism, signaling, nucleic acid binding, and parasite survival and virulence. These findings support the notion that T. cruzi uses different secretion pathways to excrete/secrete proteins (Bayer-Santos et al., 2013).
The release of exosomes leads to an increase in IL-4 and IL-10 secretion observed with a reduction in iNOS expression in CD4+ T cells and macrophages. This mechanism inducesTh2 immune response polarization causing dissemination and enhanced parasite survival (Trocoli Torrecilhas et al., 2009; Coakley et al., 2015).
Taken together, these data suggest T. cruzi-derived exosomes may play an important role in the invasion of the host-cell and the modulation of infection, favoring their perpetuation in the host. However, the mechanistic machinery behind this activity and the actual magnitude of the modulatory activity of these vesicles on mammalian host infection are still unclear.
Author Contributions
All authors participated in the write of the article. PB made the picture. BB, CS, and MS corrected the manuscript.
Funding
The authors thank to Brazilian funding agencies FAPEMIG, CNPq, and CAPES which funded this publication, grants and scholarships.
Conflict of Interest Statement
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.
References
Álvarez, J. M., Fonseca, R., Borges da Silva, H., Marinho, C. R., Bortoluci, K. R., Sardinha, L. R., et al. (2014). Chagas disease: still many unsolved issues. Mediators Inflamm. 2014, 1–9. doi: 10.1155/2014/912965
Alvarez, V. E., Niemirowicz, G. T., and Cazzulo, J. J. (2012). The peptidases of Trypanosoma cruzi: digestive enzymes, virulence factors, and mediators of autophagy and programmed cell death. Biochim. Biophys. Acta 1824, 195–206. doi: 10.1016/j.bbapap.2011.05.011
Alves, M. J., Abuin, G., Kuwajima, V. Y., and Colli W. (1986). Partial inhibition of trypomastigote entry into cultured mammalian cells by monoclonal antibodies against a surface glycoprotein of Trypanosoma cruzi. Mol. Biochem. Parasitol. 21, 75–82. doi: 10.1016/0166-6851(86)90081-2
Aparicio, I. M., Scharfstein, J., and Lima, A. P. (2004). A New cruzipain mediated pathway of human cell invasion by Trypanosoma cruzi requires trypomastigote membranes. Infect. Immun. 72, 5892–5902. doi: 10.1128/IAI.72.10.5892-5902.2004
Augustine, S. A., Kleshchenko, Y. Y., Nde, P. N., Pratap, S., and Ager, E. A. (2006). Molecular cloning of a Trypanosoma cruzi cell surface casein kinase II substrate, Tc-1, involved in cellular infection. Infect. Immun. 74, 3922–3929. doi: 10.1128/IAI.00045-06
Baida, R. C., Santos, M. R., Carmo, M. S., Yoshida, N., and Ferreira, D. (2006). Molecular characterization of serine-, Alanine-, and Proline-Rich proteins of Trypanosoma cruzi and their possible role in host cell infection. Infect. Immun. 74, 1537–1546. doi: 10.1128/IAI.74.3.1537-1546.2006
Bayer-Santos, E., Aguilar-Bonavides, C., Rodrigues, S. P., Cordero, E. M., and Marques, A. F. (2013). Proteomic analysis of Trypanosoma cruzi secretome: characterization of two populations of extracellular vesicles and soluble proteins. J. Proteome Res. 12, 883–897. doi: 10.1021/pr300947g
Bayer-Santos, E., Lima, F. M., Ruiz, J. C., Almeida, I. C., and da Silveira, J. F. (2014). Characterization of the small RNA content of Trypanosoma cruzi extracellular vesicles. Mol. Biochem. Parasitol. 193, 71–74. doi: 10.1016/j.molbiopara.2014.02.004
Berasain, P., Carmona, C., Frangione, B., Cazzulo, J. J., and Goñi, F. (2003). Specific cleavage sites on human IgG subclasses by cruzipain, the major cysteine proteinase from Trypanosoma cruzi. Mol. Biochem. Parasitol. 130, 23–29. doi: 10.1016/S0166-6851(03)00139-7
Burleigh, B. A., and Andrews, N. W. (1995). The mechanisms of Trypanosoma cruzi invasion of mammalian cells. Annu. Rev. Microbiol. 49, 175–200. doi: 10.1146/annurev.mi.49.100195.001135
Burleigh, B. A., and Andrews, N. W. (1998). Signaling and host cell invasion by Trypanosoma cruzi. Curr. Opin. Microbiol. 1, 461–465. doi: 10.1016/S1369-5274(98)80066-0
Caler, E. V., de Avalos, S. V., Haynes, P. A., Andrews, N. W., and Burleigh, B. A. (1998). Oligopeptidase B-dependent signaling mediates host cell invasion by Trypanosoma cruzi. EMBO J. 17, 4975–4986. doi: 10.1093/emboj/17.17.4975
Cestari, I., Ansa-Addo, E., Deolindo, P., Inal, J. M., and Ramirez, M. I. (2012). Trypanosoma cruzi immune evasion mediated by host cell-derived microvesicles. J. Immunol. 188, 1942–1952. doi: 10.4049/jimmunol.1102053
Coakley, G., Maizels, R. M., and Buck, A. H. (2015). Exosomes and other extracellular vesicles: the new communicators in parasite infections. Trends Parasitol. 31, 477–489. doi: 10.1016/j.pt.2015.06.009
Coura, J. R., and Viñas, P. A. (2010). Chagas disease: a new worldwide challenge. Nature 465, S6–S7. doi: 10.1038/nature09221
Da Silveira, J. F., Abrahamsohn, P. A., and Colli, W. (1979). Plasma membrane vesicles isolated from epimastigote forms of Trypanosoma cruzi. Biochim. Biophys. Acta 550, 2222–2232. doi: 10.1016/0005-2736(79)90209-8
Del Nery, E., Juliano, M. A., Lima, A. P. C. A., Scharfstein, J., and Juliano, L. (1997). Kininogenase Activity by the Major Cysteinyl Proteinase (Cruzipain) from Trypanosoma cruzi. J. Biol. Chem. 272, 25713–25718. doi: 10.1074/jbc.272.41.25713
Denzer, K., Kleijmeer, M. J., Heijnen, H. F. G., Stoorvogel, W., and Geuze, H. J. (2000). Exosome: from internal vesicle of the multivesicular body to intercellular signaling device. J. Cell Sci. 113, 3365–3374.
Dorta, M. L., Ferreira, A. T., Oshiro, M. E., and Yoshida, N. (1995). Ca2+ signal induced by Trypanosoma cruzi metacyclic trypomastigote surface molecules implicated in mammalian cell invasion. Mol. Biochem. Parasitol. 73, 285–289. doi: 10.1016/0166-6851(94)00123-5
Fernandes, A. B., and Mortara, R. A. (2004). Invasion of MDCK epithelial cells with altered expression of Rho GTPases by Trypanosoma cruzi amastigotes and metacyclic trypomastigotes of strains from the two major phylogenetic lineages. Microbes. Infect. 6, 460–467. doi: 10.1016/j.micinf.2004.01.009
Fernandes, A. B., Neira, I., Ferreira, A. T., and Mortara, R. A. (2006). Cell invasion by Trypanosoma cruzi amastigotes of distinct infectivities: studies on signaling pathways. Parasitol. Res. 100, 59–68. doi: 10.1007/s00436-006-0236-6
Fernandes, M. C., Cortez, M., Geraldo Yoneyama, K. A., Straus, A. H., and Yoshida, N. (2007). Novel strategy in Trypanosoma cruzi cell invasion: implication of cholesterol and host cell microdomains. Int. J. Parasitol. 37, 1431–1441. doi: 10.1016/j.ijpara.2007.04.025
Fernandez-Calero, T., Garcia-Silva, R., Pena, A., Robello, C., and Persson, H. (2015). Profiling of small RNA cargo of extracellular vesicles shed by Trypanosoma cruzi reveals a specific extracellular signature. Mol. Biochem. Parasitol. 199, 19–28. doi: 10.1016/j.molbiopara.2015.03.003
Ferrão, P. M., d'Avila-Levy, C. M., Araujo-Jorge, T. C., Degrave, W. M., and Gonçalves, A. S. (2015). Cruzipain activates latent TGF-β from host during T. cruzi invasion. PLoS ONE 10:e0124832. doi: 10.1371/journal.pone.0124832
Giordano, R., Chammas, R., Veiga, S. S., Colli, W., and Alves, M. J. (1994). An acidic component of the heterogeneous Tc-85 protein family from the surface of Trypanosoma cruzi is a laminin binding glycoprotein. Mol. Biochem. Parasitol. 65, 85–94. doi: 10.1016/0166-6851(94)90117-1
Gonçalves, M. F., Umezawa, E. S., Katzin, A. M., de Souza, W., Alvez, M. J., and Colli, W. (1991). Trypanosoma cruzi: shedding of surface antigens as membrane vesicles. Exp. Parasitol. 72, 143–153. doi: 10.1016/0014-4894(91)90119-H
Grellier, P., Vendeville, S., Joyeau, R., Bastos, I. M., and Drobecq, H. (2001). Trypanosoma cruzi prolyl oligopeptidase Tc80 is involved in nonphagocytic mammalian cell invasion by trypomastigotes. J. Biol. Chem. 276, 47078–47086. doi: 10.1074/jbc.M106017200
Harding, C., Heuser, J., and Stahl, P. (1983). Receptor-mediated endocytosis of transferrin and recycling of the transferrin receptor in rat reticulocytes. J. Cell Biol. 97, 329–339. doi: 10.1083/jcb.97.2.329
Kuratomi, Y., Nomizu, M., Tanaka, K., Ponce, M. L., Komiyama, S., Kleinman, H. K., et al. (2002). Laminin γ1 chain peptide, C-16 (KAFDITYVRLKF), promotes migration, MMP-9 secretion, and pulmonary metastasis of B16–F10 mouse melanoma cells. Br. J. Cancer. 86, 1169–1173. doi: 10.1038/sj.bjc.6600187
Macedo, A. M., and Pena, S. D. (1998). Genetic Variability of Trypanosoma cruzi implications for the pathogenesis of chagas disease. Trends Parasitol. 14, 119–124.
Magdesian, M. H., Tonelli, R. R., Fessel, M. R., Silveira, M. S., Schumacher, R. I., Linden, R., et al. (2006). A conserved domain of the gp85/trans-sialidase family activates host cell extracellular signal-regulated kinase and facilitates Trypanosoma cruzi infection. Exp. Cell Res. 313, 210–218. doi: 10.1016/j.yexcr.2006.10.008
Mantel, P. Y., and Marti, M. (2014). The role of extracellular vesicles in Plasmodium and other protozoan parasites. Cell. Microbiol. 16, 344–354. doi: 10.1111/cmi.12259
Martins, R. M., Alvez, R. M., Macedo, S., and Yoshida, N. (2011). Starvation and rapamycin differentially regulate host cell lysosome exocytosis and invasion by Trypanosoma cruzi metacyclic forms. Cell. Microbiol. 13, 943–954. doi: 10.1111/j.1462-5822.2011.01590.x
Mashburn-Warren, L. M., and Whiteley, M. (2006). Special delivery: vesicle trafficking in prokaryotes. Mol. Microbiol. 61, 839–846. doi: 10.1111/j.1365-2958.2006.05272.x
Minciacchi, V. R., Freeman, M. R., and Di Vizio, D. (2015). Extracellular vesicles in cancer: exosomes, microvesicles and the emerging role of large oncosomes. Semin. Cell Dev. Biol. 40, 41–51. doi: 10.1016/j.semcdb.2015.02.010
Macedo, A. M., Machado, C. R., Oliveira, R. P., and Pena, S. D. (2004). Trypanosoma cruzi: genetic structure of populations and relevance of genetic variability to the pathogenesis of chagas disease. Mem. Inst. Oswaldo Cruz. 99, 1–12. doi: 10.1590/S0074-02762004000100001
Moody, T. N., Ochieng, J., and Villalta, F. (2000). Novel mechanism that Trypanosoma cruzi uses to adhere to the extracellular matrix mediated by human galectin-3. FEBS Lett. 470, 305–308. doi: 10.1016/S0014-5793(00)01347-8
Nde, P. N., Simmons, K. J., Kleshchenko, Y. Y., Pratap, S., and Lima, M. F. (2006). Silencing of the laminin gamma-1 gene blocks Trypanosoma cruzi infection. Infect. Immun 74, 1643–1648. doi: 10.1128/IAI.74.3.1643-1648.2006
Neves, R. F., Fernandes, A. C., Meyer-Fernandes, J. R., and Souto-Padrón, T. (2014). Trypanosoma cruzi-secreted vesicles have acid and alkaline phosphatase activities capable of increasing parasite adhesion and infection. Parasitol. Res. 113, 2961–2972. doi: 10.1007/s00436-014-3958-x
Nogueira, P. M., Ribeiro, K., Silveira, A. C., Campos, J. H., and Martins-Filho, O. A. (2015). Vesicles from different Trypanosoma cruzi strains trigger differential innate and chronic immune responses. J. Extracell. Vesicles 4:28734. doi: 10.3402/jev.v4.28734
Ostrowski, M., Carmo, N. B., Krumeich, S., Fanget, I., and Raposo, G. (2010). Rab27a and Rab27b control different steps of the exosome secretion pathway. Nat. Cell Biol. 12, 19–30. doi: 10.1038/ncb2000
Ouaissi, M. A., Cornette, J., Afchain, D., Capron, A., and Gras-Masse, H. (1986). Trypanosoma cruzi infection inhibited by peptides modeled from a fibronectin cell attachment domain. Science 234, 603–607. doi: 10.1126/science.3094145
Pan, B. T., Teng, K., Wu, C., Adam, M., and Johnstone, R. M. (1985). Electron microscopic evidence for externalization of the transferrin receptor in vesicular form in sheep reticulocytes. J. Cell Biol. 101, 942–948. doi: 10.1083/jcb.101.3.942
Procópio, D. O., Barros, H. C., and Mortara, R. A. (1999). Actin-rich structures formed during the invasion of cultured cells by infective forms of Trypanosoma cruzi. Eur. J. Cell Biol. 78, 911–924. doi: 10.1016/S0171-9335(99)80093-4
Procópio, D. O., da Silva, S., Cunningham, C. C., and Mortara, R. A. (1998). Trypanosoma cruzi: effect of protein kinase inhibitors and cytoskeletal protein organization and expression on host cell invasion by amastigotes and metacyclic trypomastigotes. Exp. Parasitol. 90, 1–13. doi: 10.1006/expr.1998.4314
Ramirez, M. I., Ruiz, R. C., Araya, J. E., Da Silveira, J. F., and Yoshida, N. (1993). Involvement of the stage-specific 85-kilodalton adhesion molecule of Trypanosoma cruzi metacyclic trypomastigotes in host cell invasion. Infect. Immun. 61, 3636–3641.
Rodrigues, A. A., Clemente, T. M., Santos, M. A., Machado, F. C., and Gomes, R. G. B. (2012). Recombinant protein based on Trypanosoma cruzi P21 enhances phagocytosis. PLoS ONE 7:e51384. doi: 10.1371/journal.pone.0051384
Rodrigues, M. L., Nakayasu, E. S., Oliveira, D. L., Nimrichter, L., and Nosanchuk, J. D. (2008). Extracellular vesicles produced by Cryptococcus neoformans contain protein components associated with virulence. Eukaryotic Cell. 7, 58–67. doi: 10.1128/EC.00370-07
Rodríguez, A., Samoff, E., Rioult, M. G., Chung, A., and Andrews, N. W. (1996). Host cell invasion by trypanosomes requires lysosomes and microtubule/kinesin-mediated transport. J. Cell. Biol. 134, 349–362. doi: 10.1083/jcb.134.2.349
Ruiz, R. C., Favoreto, S. Jr., Dorta, M. L., Oshiro, M. E. M., and Ferreira, A. T. (1998). Infectivity of Trypanosoma cruzi strains is associated with differential expression of surface glycoproteins with differential Ca2+ signaling activity. Biochem. J. 330, 505–511. doi: 10.1042/bj3300505
Santana, J. M., Grellier, P., Schrevel, J., and Teixeira, A. R. (1997). A Trypanosoma cruzi-secreted 80 kDa proteinase with specificity for human collagen types I and IV. Biochem. J. 325, 129–137. doi: 10.1042/bj3250129
Santos, J. S. C. (2010). Papel dos receptores B1 e B2 de Bradicinina e de Captopril nas Interações Célula Hospedeira-Trypanosoma Cruzi e na Resposta Imune Frente a Estimulação pelo Parasita. 120 f. Tese (Doutorado em Biologia Celular) - Instituto de Ciências Biológicas da Universidade Federal de Minas Gerais.
Scharfstein, J., Schmitz, V., Morandi, V., Capella, M. M., and Lima, A. P. (2000). Host cell invasion by Trypanosoma cruzi is potentiated by activation of bradykinin B2Receptors. J. Exp. Med. 192, 1289–1300. doi: 10.1084/jem.192.9.1289
Silva, C. V., Kawashita, S. Y., Probst, C. M., Dallagiovanna, B., and Cruz, M. C. (2009). Characterization of a 21 kDa protein from Trypanosoma cruzi associated with mammalian cell invasion. Microbes Infect. 11, 563–570. doi: 10.1016/j.micinf.2009.03.007
Silva, C. V., Luquetti, A. O., Rassi, A., and Mortara, R. A. (2006). Involvement of Ssp-4-related carbohydrate epitopes in mammalian cell invasion by Trypanosoma cruzi amastigotes. Microbes Infect. 8, 2120–2129. doi: 10.1016/j.micinf.2006.03.016
Silvermann, J. M., Clos, J., de'Oliveira, C. C., Shirvani, O., Fang, Y., Wang, C., et al. (2010). An exosome-based secretion pathway is responsible for protein export from Leishmania and communication with macrophages. J. Cell Sci. 123, 842–852. doi: 10.1242/jcs.056465
Teixeira, T. L., Machado, F. C., Alves da Silva, A., Teixeira, S. C., Borges, B. C., Dos Santo, M. A., et al. (2015). Trypanosoma cruzi P21, a potential novel target for chagasic cardiomyopathy therapy. Sci. Rep 5:16877. doi: 10.1038/srep16877
Todorov, A. G., Andrade, D., Pesquero, J. B., Araujo, R. C., and Bader, M. (2003). Trypanosoma cruzi induces edematogenic responses in mice and invades cardiomyocytes and endothelial cells in vitro by activating distinct kinin receptor (B1/B2) subtypes. FASEB J. 17, 73–75. doi: 10.1096/fj.02-0477fje
Tonelli, R. R., Giordano, R. J., Barbu, E. M., Torrecilhas, A. C., and Kobayashi, G. S. (2010). Role of the gp85/tans-sialidases in Trypanosoma cruzi tissue tropism:preferential binding of a conserved peptide motif to the vasculature in vivo. PLoS Negl. Trop. Dis. 4:e864. doi: 10.1371/journal.pntd.0000864
Trocoli Torrecilhas, A. C., Tonelli, R. R., Pavanelli, W. R., da Silva, J. S., Schumacher, R. I., de Souza, W., et al. (2009). Trypanosoma cruzi: parasite shed vesicles increase heart parasitism and generate an intense inflammatory response. Microbes Infect. 11, 29–39. doi: 10.1016/j.micinf.2008.10.003
Twu, O., and Johnson, P. J. (2014). Parasite extracellular vesicles: mediators of intercellular communication. PLoS Pathog. 10:e1004289. doi: 10.1371/journal.ppat.1004289
Villalta, F., Smith, C. M., Ruiz-Ruano, A., and Lima, M. F. (2001). A ligand that Trypanosoma cruzi uses to bind to mammalian cells to initiate infection. FEBS Lett. 505, 383–388. doi: 10.1016/S0014-5793(01)02853-8
Yoshida, N. (2006). Molecular basis of mammalian cell invasion by Trypanosoma cruzi. An. Acad. Bras. Ciênc. 78, 87–111. doi: 10.1590/s0001-37652006000100010
Yoshida, N., and Cortez, M. (2008). Trypanosoma cruzi: parasite and host cell signaling during the invasion process. Mol. Mech. Parasite Invasion 47, 82–91. doi: 10.1007/978-0-387-78267-6_6
Yoshida, N., Favoreto, S. Jr., Ferreira, A. T., and Manque, P. M. (2000). Signal transduction induced in Trypanosoma cruzi metacyclic trypomastigotes during the invasion of mammalian cells. Braz. J. Med. Biol. Res. 33, 269–278. doi: 10.1590/S0100-879X2000000300003
Zanforlin, T., Bayer-Santos, E., Cortez, C., Almeida, I. C., Yoshida, N., and da Silveira, J. F. (2013). Molecular characterization of Trypanosoma cruzi SAP proteins with host-cell lysosome exocytosis-inducing activity required for parasite invasion. PLoS ONE. 8:e83864. doi: 10.1371/journal.pone.0083864
Keywords: exosomes, microvesicles, Trypanosoma cruzi, cell invasion, cell evasion
Citation: Borges BC, Uehara IA, Dias LOS, Brígido PC, da Silva CV and Silva MJB (2016) Mechanisms of Infectivity and Evasion Derived from Microvesicles Cargo Produced by Trypanosoma cruzi. Front. Cell. Infect. Microbiol. 6:161. doi: 10.3389/fcimb.2016.00161
Received: 11 August 2016; Accepted: 07 November 2016;
Published: 22 November 2016.
Edited by:
Brice Rotureau, Institut Pasteur, FranceReviewed by:
Debora Decote-Ricardo, Universidade Federal Rural do Rio de Janeiro, BrazilEmilio Luis Malchiodi, University of Buenos Aires, Argentina
Christoph Hölscher, Forschungszentrum Borstel (LG), Germany
Copyright © 2016 Borges, Uehara, Dias, Brígido, da Silva and Silva. 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) or licensor 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: Bruna C. Borges, brunacb90@gmail.com