Immune response studies with Wuchereria bancrofti vespid

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Immune response studies with Wuchereria bancrofti vespid

Postby patoco » Fri Jun 15, 2007 10:31 pm

Immune response studies with Wuchereria bancrofti vespid allergen homologue (WbVAH) in human lymphatic filariasis.

Parasitol Res. 2007 Jun 9

Anand SB, Gnanasekar M, Thangadurai M, Prabhu PR, Kaliraj P, Ramaswamy K.
Centre for Biotechnology, Anna University, Chennai, 600025, India.

A homologue of Brugia malayi venom allergen (BmVAH) was cloned from the infective stages (L3) of Wuchereria bancrofti. Sequence analysis showed 90% sequence identity between WbVAH and BmVAH. Recombinant WbVAH was then expressed and purified. VAH from other nematode parasites is being evaluated as potential vaccine candidates. Because W. bancrofti infections are more prevalent than B. malayi, it will significantly benefit using W. bancrofti antigens for vaccine development. In this study, we have evaluated the human immune responses to rWbVAH in putatively immune individuals who live in the endemic regions (endemic normal, EN) to determine the vaccine potential of WbVAH. These responses were then compared to those in infected individuals (microfilaraemic, MF and chronic pathology, CP). Results show that EN subjects carry WbVAH-specific IgG1, IgG2, and IgG3 circulating antibodies. It is interesting to note that CP patients also carried antibodies against WbVAH that was mainly of the IgG3 isotype. Peripheral blood mononuclear cells (PBMC) from EN individuals responded strongly to rWbVAH by proliferating and secreting IFN-gamma. PBMC from MF patients also proliferated in response to rWbVAH but secreted mainly IL-10. Thus, there was a clear dichotomy in the cytokine production by infected patients vs individuals who are putatively immune (EN). Although vaccine potential of WbVAH has not been established yet, our findings suggest that WbVAH mediated immune responses in EN individuals is primarily Th1-biased. Further vaccination studies are underway in animal models to determine the role of WbVAH in protective immunity against W. bancrofti and B. malayi infections.

PMID: 17558521 [PubMed - as supplied by publisher]

http://www.ncbi.nlm.nih.gov/sites/entre ... d_RVDocSum

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