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Journal of Clinical Microbiology, 02 1996, 241-248, Vol 34, No. 2
Copyright © 1996 by the American Society for Microbiology. All rights reserved.

Synthetic peptide-based enzyme-linked immunosorbent assay for serodiagnosis of visceral leishmaniasis

C Fargeas, M Hommel, R Maingon, C Dourado, M Monsigny and R Mayer
Glycobiologie, Centre National de la Recherche Scientifique, Orleans, France.

Synthetic peptides, derived from the amino acid sequence of a Leishmania donovani clone, were used to develop an enzyme-linked immunosorbent assay (ELISA) for detecting antibodies against L. donovani. For this purpose, five peptides were conjugated to a protein carrier, human serum albumin (HSA), by using a heterobifunctional reagent, epsilon-maleimidocaproic acid N-hydroxysuccinimide ester, to obtain a well-defined product. The sensitivity and the specificity of the peptide-specific ELISA were determined with a panel of 106 serum samples from individuals living in areas where visceral leishmaniasis is endemic; sera from post-kala azar dermal leishmaniasis-infected patients and from individuals suffering from other infectious diseases were also included. ELISAs were performed with either a single peptide- HSA conjugate or a mixture of two peptide-HSA conjugates. Ninety-seven percent of the serum samples from patients with visceral leishmaniasis had detectable antibodies to one or more of the single synthetic peptides. ELISA with a single peptide-HSA conjugate proved to be less sensitive (less than 71%) but more specific (up to 93%) than ELISA with crude promastigote antigens (80% sensitivity and 79% specificity); when a combination of two different peptide-HSA conjugates was used, the test increased both in sensitivity and in specificity. Chemically defined peptide-protein conjugates improve the reproducibility and reliability of ELISA for the serodiagnosis of L. donovani infection.


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