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. 1989 Dec;57(12):3770–3777. doi: 10.1128/iai.57.12.3770-3777.1989

Amastigote stage-specific monoclonal antibodies against Leishmania major.

C L Jaffe 1, N Rachamim 1
PMCID: PMC259903  PMID: 2680982

Abstract

Monoclonal antibodies were produced against gamma-irradiated amastigotes of Leishmania major. Five antibodies (T16 through T20) were selected which reacted in enzyme-linked immunoassays with the intracellular stage of the parasite. These antibodies did not react with promastigotes of L. major or Leishmania donovani. One of the monoclonal antibodies (T16) reacted with amastigotes of Leishmania mexicana amazonensis and L. donovani. Western blotting (immunoblotting) and immunoprecipitation of [35S]methionine-labeled amastigotes demonstrates that T16 reacted with multiple L. major amastigote components between 12 and 180 kilodaltons. Antibody T20 was shown to recognize a low-molecular-mass doublet (less than 26 kilodaltons) in both [14C]leucine- and [35S]methionine-labeled amastigotes. A protein of less than 180 kilodaltons was also weakly recognized by T17, T19, and T20 in metabolically labeled amastigotes. This protein reacted strongly with T16. The reactive antigens could be identified on the surface of amastigotes isolated from the lesions of infected mice and on newly transformed amastigotes within 24 h after the infection of mouse peritoneal macrophages by promastigotes. These monoclonal antibodies should prove useful for the diagnosis of L. major in human tissue biopsies.

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