Antigenic Cross-reactivity among Haemonchus contortus, Oesophagostomum columbianum and Trichuris ovis of Goat
AbstractBackground: Cross antigenicity is the major problem in developing a reliable tool for immunodiagnosis and immunoprophylaxis of parasitic diseases. Mixed infection due to different types of gastrointestinal parasites is more common than single species infection under field condition.Methods: The present study was undertaken to detect antigenic cross-reactivity among Haemonchus contortus, Oesophagostomum columbianum and Trichuris ovis of goats by SDS-PAGE and western blot analysis using hyperimmune sera (HIS) rose in rabbit separately against the antigens of the three nematode species.Results: Thirteen, 16 and 14 polypeptides in crude somatic antigen (CSAg) of H. contortus (CSAg-Hc), O. columbianum (CSAg-Oc) and T. ovis (CSAg-To), respectively, were resolved in SDS PAGE analyses. It was revealed that 54 kDa peptide was shared by H.contortus and O. columbianum, whereas 47 kDa peptide was shared by O. columbianum and T. ovis. Western blot analyses revealed that three immunogenic polypeptides (MW 54, 49 and 42 kDa) in CSAg-Hc, five in CSAg-Oc (54, 47, 44, 38 and 35.5 kDa) and CSAg-To and five polypeptides (90, 51, 47, 39.5 and 31 kDa) in CSAg-To cross-reacted with the heterologous HIS. Four species-specific immunoreactive polypeptides (92, 85, 65 and 39 kDa) of H. contortus and two (72 & 26 kDa) in O. columbianum were also identified in the study. Conclusion: The shared polypeptides and species-specific polypeptides might be evaluated as protective antigen and subsequently exploitation for developing immunodiagnostic and for immunoprophylactic tools of for these common nematode species.
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