With the purpose of studying the antigenic role that factors excreted by Leishmania amastigotes might have during murine infection, immunoblots were carried out with sera from C57BL/6 and BALB/c mice infected with two strains of Leishmania (L.) amazonensis, NR and IFLA/BR. Both strains differ widely in virulence in BALB/c mice. BALB/c but not C57BL/6 sera recognized several excretion products. The excreted antigens showed a strong response towards IgG1 and IgG2a isotypes whilst they reacted only weakly against IgG2b and IgG3. A low-molecular weight antigen (about 20 kDa) excreted by both Leishmania strains was strongly recognized by IgG1 from BALB/c mice sera infected with IFLA/BR, the most virulent strain. Sera from NR infected mice were incapable of recognizing this antigen in spite of its presence in NR excreted products. The results indicate that the humoral immune response to excreted antigens of amastigotes depends on both the host genetic background and the parasite strain.
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