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Authordc.contributor.authorRamírez Toloza, Galia es_CL
Authordc.contributor.authorValck, Carolina es_CL
Authordc.contributor.authorMolina, María C. es_CL
Authordc.contributor.authorRibeiro, Carolina Hager es_CL
Authordc.contributor.authorLópez, Nandy es_CL
Authordc.contributor.authorSánchez, Gittith es_CL
Authordc.contributor.authorFerreira, Viviana P. es_CL
Authordc.contributor.authorBilletta, Rosario es_CL
Authordc.contributor.authorAguilar, Lorena es_CL
Authordc.contributor.authorMaldonado, Ismael es_CL
Authordc.contributor.authorCattan Ayala, Pedro es_CL
Authordc.contributor.authorSchwaeble, Wilhelm es_CL
Authordc.contributor.authorFerreira Vigouroux, Luis Arturo 
Admission datedc.date.accessioned2011-11-30T20:04:20Z
Available datedc.date.available2011-11-30T20:04:20Z
Publication datedc.date.issued2011
Cita de ítemdc.identifier.citationImmunobiology 216 (2011) 265–273es_CL
Identifierdc.identifier.otherdoi:10.1016/j.imbio.2010.04.001
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/128922
General notedc.descriptionArtículo de publicación ISIes_CL
Abstractdc.description.abstractIn Trypanosoma cruzi, calreticulin (TcCRT) translocates from the endoplasmic reticulum (ER) to the area of flagellum emergence. We propose herein that the parasite uses this molecule to capture complement C1, in an infective apoptotic mimicry strategy. Thus, TcCRT/C1 interactions, besides inhibiting the classical pathway of complement activation as previously shown in our laboratories, will also promote infectivity. This fact correlates with significant increases in TcCRT mRNA levels during early infection stages of a VERO cell line. In vitro, the collagenous and globular C1q domains simultaneously bind TcCRT and antigen aggregated Igs, respectively. Accordingly, mouse immunizations with TcCRT induced humoral responses that, after challenge, correlated with increased parasitemia. Thus, on the parasite surface, whole Igs anti-TcCRT promote C1 deposits on trypomastigotes while, as expected, F(ab )2 fragments decrease it. Likewise, pretreatment of the parasites with whole anti-TcCRT antibodies augmented parasitemia and mortality in mice. In contrast, pretreatment with F(ab )2 fragments anti-TcCRT, devoid of their capacity to provide additional C1q binding sites, was protective. Most important, while pretreatment of trypomastigotes with C1q increased infectivity in the RAW murine cell line, as well as mice mortality and parasitemia, the F(ab )2 fragments significantly interfered with the C1q-dependent infectivity. Differently from other surface molecules involved in infectivity, TcCRT uses C1 as an adaptor molecule to recognize host cells. As expected, since TcCRT is one of several cell surface parasite molecules participating in infectivity, attempts to interfere with the C1/TcCRT interactions with F(ab )2 fragments, were moderately but significantly effective, both in vitro and in vivo.es_CL
Patrocinadordc.description.sponsorshipThis work was supported by a grant from CONICYT-Chile (Regular FONDECYT 1095095) and Bicentennial Collaborative Research Projects-Chile, ACT29 and ACT112.es_CL
Lenguagedc.language.isoenes_CL
Publisherdc.publisherElsevieres_CL
Keywordsdc.subjectTrypanosoma cruzi calreticulines_CL
Títulodc.titleTrypanosoma cruzi calreticulin: A novel virulence factor that binds complement C1 on the parasite surface and promotes infectivityes_CL
Document typedc.typeArtículo de revista


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