Identification of a HSP14-3-3 in Setaria cervi and its cross-reactivity with W bancrofti-infected human sera.

Parasite Immunology
Faiyaz AhmadSushma Rathaur

Abstract

Identification of a 29 kDa heat stress protein in filarial parasite Setaria cervi and evaluation of its diagnostic potential against lymphatic filariasis. The Heat shock proteins (HSPs) were induced in filarial parasite S cervi by incubated at 42°C for 2 hours. The 10% SDS-PAGE of cytosolic extract showed several over-expressed bands. The MALDI-LC/MS analysis of 29 kDa band showed 100% similarity with Bm14-3-3 like protein 2. Multiple sequence alignment of Bm14-3-3 like protein 2 sequence with W bancrofti, Caenorhabditis elegans; Loa loa and Homo sapiens showed 100%, 86%, 83% and 78%, sequence similarity respectively. The antigenic efficacy of Sc14-3-3 protein was evaluated with different filarial sera using ELISA which showed cross-reactivity in order to Endemic Normal (EN) < Microfilaraemic (MF) < Chronic(CH) with IgG1 and EN < CH < MF in IgG4 ELISA. IgG1- and IgG4-specific immunoblotting with CH and MF sera further explicated its specific antigenic cross-reactivity. A 29 kDa heat shock protein of S cervi was identified as 14-3-3 protein having 100% homology to human filarial parasite B malayi. It showed strong reactivity with IgG1 and IgG4 subclass antibodies of W bancrofti-infected human sera suggesting that 14-3-3 protein ...Continue Reading

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