Lack of serological specificity of recombinant heat shock protein of Leishmania donovani

Immunology and Cell Biology
S K AroraS Sehgal

Abstract

In order to identify a specific recombinant antigen of Leishmania donovani with potential use for diagnosis, a cDNA library was constructed in lambda ZAP II expression vector. On screening the cDNA library using pooled sera from Indian patients with kala azar, 20 antibody reactive clones were identified. These were subcloned into pBluescript phagemid by an in vivo excision procedure. The molecular weights of the expressed recombinant proteins varied from 15 to 70 kDa and the cDNA insert sizes varied from 0.5 kb to the largest size of approximately 2.0 kb which was designated as the E2b clone. The nucleotide sequencing revealed that 50% of the clones had sequence homology to the heat shock protein gene of L. donovani. The serological studies conducted with the kala azar positive sera and sera from healthy laboratory workers using the recombinant protein from the E2b clone and having sequence homology to Ldhsp 70, indicated that although all the kala azar sera was positive, 12 of 20 healthy individuals also showed antibodies against the recombinant hsp70, indicating that this antigen is not suitable for serological diagnosis of kala azar.

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Citations

Sep 25, 2007·Transactions of the Royal Society of Tropical Medicine and Hygiene·Sunil K AroraN L Sharma
Nov 5, 2002·Clinical and Diagnostic Laboratory Immunology·Rosângela Barbosa-De-DeusCarlos Alberto Pereira Tavares
Feb 20, 2007·Memórias do Instituto Oswaldo Cruz·Edward José de OliveiraMário Hiroyuki Hirata
Sep 10, 2002·Memórias do Instituto Oswaldo Cruz·Herminia Y KanamuraRaymond T Damian
Dec 1, 2006·Dermatology : International Journal for Clinical and Investigative Dermatology·Teoman Zafer Apan, Sedat Kaygusuz
Jun 10, 1998·Immunology and Cell Biology·S K AroraS Sehgal
Dec 13, 2016·Transactions of the Royal Society of Tropical Medicine and Hygiene·Anuradha Ratna, Sunil K Arora

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