title: The complement system of Calomys callosus, Rengger, 1830 (Rodentia, Cricetidae).
abstract: The complement system (C) of Calomys callosus, Rengger, 1830 (Rodentia, Cricetidae), a wild reservoir for several infectious agents in Latin America, was characterized. Sera from normal adult animals lysed sheep erythrocytes (Es) previously sensitized with rabbit serum anti-Es (Ar) in the presence of veronal-buffered saline containing 0.15 mM CaCl2 and 0.5 mM MgCl2, pH 7.4, or unsensitized rabbit erythrocytes (Er) in the presence of one-half isotonic strength veronal-buffered-saline containing 2.5% glucose, 2 mM MgCl2 and 10 mM EGTA, pH 7.4. Both hemolytic curves were sigmoidal in shape, with CH50 values of 30-40 for females and 20-30 for males. C5, determined hemolytically using the intermediate cells EsArClm4m2m3m, was approximately 4.5 x 10(8)/ml and 4.0 x 10(8)/ml for females and males, respectively. Immunochemical serum analyses by double immunodiffusion or by immunoblotting using polyclonal antisera against human C1s, C1q, C2, C3, C4, C5, C8 and factors B, I and H indicated that C. callosus C components factor B, C4 and C3 cross-reacted with the corresponding human C components. Thus, C. callosus was found to contain effective classical and alternative pathways (CP, AP) and common pathways, reasonable amounts of C5 and common epitopes in the key C components, factor B, C4 and C3, which were preserved during evolution.
authors.affiliation: Seção de Imunologia, Instituto Adolfo Lutz, São Paulo, Brasil.
authors.forename: L R
authors.initials: LR
authors.lastname: Vaz-de-Lima
authors.forename: A
authors.initials: A
authors.lastname: Kipnis
authors.forename: T L
authors.initials: TL
authors.lastname: Kipnis
authors.forename: W
authors.initials: W
authors.lastname: Dias-da-Silva
mesh_terms: D000818:Animals; D003411:Arvicolinae / Q000276:immunology*; D003170:Complement Pathway, Alternative / Q000276:immunology; D003171:Complement Pathway, Classical / Q000276:immunology; D003165:Complement System Proteins / Q000276:immunology*; D004195:Disease Models, Animal; D004197:Disease Reservoirs; D005260:Female; D015151:Immunoblotting; D005779:Immunodiffusion; D007843:Latin America; D008297:Male; D051379:Mice; D011817:Rabbits
chemical_list: D003165:Complement System Proteins