title: [In vitro infection by different strains of Paracoccidioides brasiliensis].
abstract: We analyzed the in vitro infection process by P. brasiliensis and the effect of extracellular factor(s) produced on monolayers of mammalian Vero cell lines. The yeast phase of four strains was studied: B339 (avirulent or slightly virulent), U, (intermediate virulence), 93745 and 63265 (both highly virulent). Strains of intermediate and high virulence had higher adherence at first contact (about 16%). Strain B339 had a slower adherence at first contact (8%) than the others during the same period. The production of extracellular proteases, soluble extracellular factor(s) and extracellular antigen gP43 showed no correlation with the in vitro physiopathogenicity of the analyzed strains. We demonstrate that the Vero model presented in this paper is a suitable system to study infection and virulence in vitro. We are currently assessing its usefulness as a tool for the analysis of the interaction between pathogen, host and antifungal agents.
authors.affiliation: Departamento Micología, Instituto Nacional de Enfermedades Infecciosas, INEI ANLIS Dr. Carios G. Malbrán, Ministerio de Salud, Buenos Aires, Argentina. ccanteros@connmed.com.ar
authors.forename: C E
authors.initials: CE
authors.lastname: Canteros
authors.forename: M A
authors.initials: MA
authors.lastname: Soria
authors.forename: M C
authors.initials: MC
authors.lastname: Rivas
authors.forename: C
authors.initials: C
authors.lastname: Pérez
authors.forename: M
authors.initials: M
authors.lastname: Tous
authors.forename: W
authors.initials: W
authors.lastname: Lee
authors.forename: L
authors.initials: L
authors.lastname: Rodero
authors.forename: G
authors.initials: G
authors.lastname: Davel
mesh_terms: D000818:Animals; D000946:Antigens, Fungal; D002522:Chlorocebus aethiops; D003470:Culture Media; D005656:Fungal Proteins / Q000096:biosynthesis; D006023:Glycoproteins / Q000096:biosynthesis; D009172:Mycology / Q000379:methods*; D009844:Oligosaccharides / Q000096:biosynthesis; D010228:Paracoccidioides / Q000145:classification / Q000254:growth & development / Q000472:pathogenicity / Q000502:physiology*; D013045:Species Specificity; D014709:Vero Cells / Q000382:microbiology; D014774:Virulence
chemical_list: C103180:43 kDa protein, Paracoccidioides; D000946:Antigens, Fungal; D003470:Culture Media; D005656:Fungal Proteins; D006023:Glycoproteins; D009844:Oligosaccharides