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dc.contributor.authorDominguez-Rodriguez, Mercedes 
dc.contributor.authorMoreno-Iruela, Inmaculada 
dc.contributor.authorLópez-Trascasa, Margarita
dc.contributor.authorToraño, Alfredo 
dc.date.accessioned2019-04-29T12:23:33Z
dc.date.available2019-04-29T12:23:33Z
dc.date.issued2002-02-18
dc.identifier.citationJ Exp Med. 2002;195(4):451-9.es_ES
dc.identifier.issn0022-1007es_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12105/7532
dc.description.abstractIn normal human serum (NHS), axenic promastigotes of Crithidia, Phytomonas, and Leishmania trigger complement activation, and from 1.2 to 1.8 x 10(5) C3 molecules are deposited per promastigote within 2.5 min. In Leishmania, promastigote C3 binding capacity remains constant during in vitro metacyclogenesis. C3 deposition on promastigotes activated through the classical complement pathway reaches a 50% maximum after similar50 s, and represents >85% of total C3 bound. In C1q- and C2-deficient human sera, promastigotes cannot activate the classical pathway (CP) unless purified C1q or C2 factors, respectively, are supplemented, demonstrating a requirement for CP factor in promastigote C3 opsonization. NHS depleted of natural anti-Leishmania antibodies cannot trigger promastigote CP activation, but IgM addition restores C3 binding. Furthermore, Leishmania binds natural antibodies in ethylenediaminetetracetic acid (EDTA)-treated NHS; after EDTA removal, promastigote-bound IgM triggers C3 deposition in natural antibody-depleted NHS. Serum collectins and pentraxins thus do not participate significantly in NHS promastigote C3 opsonization. Real-time kinetic analysis of promastigote CP-mediated lysis indicates that between 85--95% of parasites are killed within 2.5 min of serum contact. These data indicate that successful Leishmania infection in man must immediately follow promastigote transmission, and that Leishmania evasion strategies are shaped by the selective pressure exerted by complement.es_ES
dc.description.sponsorshipThis work was supported by grants 08.2/0006/97 from the Comunidad Autónoma de Madrid, PM99-0012 from the Programa Nacional de Salud (Ministerio de Educación y Cultura), and institutional funds from the Centro Nacional de Microbiología, Instituto de Salud Carlos III.es_ES
dc.language.isoenges_ES
dc.type.hasVersionVoRes_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.subjectTrypanosomatidses_ES
dc.subjectLeishmaniaes_ES
dc.subjectPromastigote lysises_ES
dc.subjectHuman serumes_ES
dc.titleComplement interaction with trypanosomatid promastigotes in normal human serumes_ES
dc.typejournal articlees_ES
dc.rights.licenseAtribución-NoComercial-CompartirIgual 4.0 Internacional*
dc.identifier.pubmedID11854358es_ES
dc.format.volume195es_ES
dc.format.number4es_ES
dc.format.page451-9es_ES
dc.contributor.funderComunidad de Madrid (España) 
dc.contributor.funderInstituto de Salud Carlos III 
dc.contributor.funderMinisterio de Educación y Cultura (España) 
dc.identifier.journalThe Journal of experimental medicinees_ES
dc.repisalud.centroISCIII::Centro Nacional de Microbiología::Área de Inmunologíaes_ES
dc.repisalud.institucionISCIIIes_ES
dc.rights.accessRightsopen accesses_ES


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Atribución-NoComercial-CompartirIgual 4.0 Internacional
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