Relationships between cell surface protease and acid phosphatase activities ofLeishmania promastigote |
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| Authors: | Angel G Hernandez Ana Rascon Shirley Kutner Henry Roman Zulaika Campos |
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| Institution: | 1. Departamento de Biologia Celular, Facultad de Ciencias, Universidad Central de Venezuela, Apartado 47069, Los Chaguaramos, 1041-A, Caracas, Venezuela
2. Department of Parasitology and the Kuvin Centre for the Study of Infectious and Tropical Diseases, The Hebrew University, Jerusalem, Israel
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| Abstract: | A correlation between the ratio of the cell surface protease activity to phosphatase activity and the complexity of the pattern of cell surface exposed polypeptides ofLeishmania promastigotes was demonstrated for various strains grown under similar conditions. The ratio of the cell surface protease activity to acid phosphatase activity was high forL. major andL.b. panamensis and it correlates with the expression of a single polypeptide of 63 KDa on their cell surface. Intermediate and lower ratios of these enzymatic activites relate with more complex radio-iodinated patterns: two main bands inL.b. guyanensis (70 and 58 KDa) andL.b. braziliensis (72 and 60 KDa) and three main bands 65, 50, 27 KDa in allL.m. mexicana strains tested. Evidence is presented that the acid phosphatase located on theL.m. mexicana cell surface is not an artifact due to a secondary absorption of the secreted acid phosphatase from the culture medium. These results confirm theLeishmania antigen cell surface heterogeneity. The implications on the biology ofLeishmania and the clinical manifestation of leishmaniasis are discussed. |
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