Authors: N S Qi Y Y Wang S Q Liao C Y Wu M N Lv J Li Z X Tong M F Sun
Publish Date: 2013/04/05
Volume: 112, Issue: 6, Pages: 2281-2287
Abstract
Eimeria tenella microneme protein 1 EtMIC1 is highly conserved with TgMIC2 which is involved in parasite binding specifically to host cells Little is known about the immune responses and protective efficacy against E tenella infection with EtMIC1 antigen In the present study the recombinant proteins of E tenella mature MIC1 and adhesive domain von Willebrand factor type A domain EtMIC1VD were obtained protective efficacy against Etenella infection and the mucosal immune response which is induced in broilers was evaluated The antibody levels and the transcription profiles of cytokine of chickens such as interleukin12 IL12 and interferonγ IFNγ were detected after being immunized three times with the recombinant EtMIC1 and EtMIC1VD by ELISA assay and quantitative realtime PCR respectively The results showed that both groups of chickens after being immunized with 100 μg EtMIC1 or EtMIC1VD antigen induced about tenfold higher IgG levels compared to the nonimmune groups The transcription profiles of IL12 and IFNγ of the immunized groups were significantly higher than the control groups as well The anticoccidial index of the group immunized with 100 μg EtMIC1 and the group immunized with 100 μg EtMIC1VD were 1672 and 1655 respectively which are significantly higher than lowdose immunized groups and challenged control groups Our data suggests that VD domain is the key functional structure of EtMIC1 that could trigger a significant humoral and cellular response against E tenella infection and EtMIC1 had the potential in imparting partial protection in chickens against homologous challenge
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