Species-specific antibodies to Leishmania tropica (minor) recognize somatic antigens and exometabolites

C. L. Jaffe, R. Sarfstein

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25 Scopus citations

Abstract

Monoclonal antibodies were raised against membranes of Leishmania tropica (formerly L. tropica minor). These antibodies do not react with membranes or homogenates prepared from any other species of Leishmania examined. The antigens identified by all four monoclonal antibodies reside on the external surface of the promastigote and are released into the culture medium. Immunoprecipitation of metabolically ([3H]glucose, -glucosamine, or [35S]methionine)-labeled, [125I]lactoperoxidase-labeled, or Western blot analysis of the parasites identified species-specific determinants residing on several different molecules with M(r) between 12,000 and 140,000. All of the monoclonal antibodies appear to recognize determinants on a common [3H]sugar-labeled glycoconjugate, M(r) = 32,000 to 44,000, but also react with additional components of 55,000, 80,000, 92,000, and 130,000 m.w. Antibody binding to the parasites is very sensitive to mild oxidation with periodate, suggesting that the species-specific determinants are carbohydrate in nature.

Original languageEnglish
Pages (from-to)1310-1319
Number of pages10
JournalJournal of Immunology
Volume139
Issue number4
StatePublished - 1987
Externally publishedYes

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