Screening of the monoclonal antibodies against the membrane proteins of chicken embryo fibroblast which can block the infection of IBDV.

【Objective】To establish an efficient assay for screening monoclonal antibodies (McAbs) against the membrane proteins of chicken embryo fibroblast (CEF) for further studies of the cellular receptors of infectious bursal disease virus (IBDV). 【Method】 McAbs against the membrane proteins of CEF were prepared by cell fusion. The monolayer CEF pre-incubated with the CEF-specific McAbs for 2 h were infected with IBDV and incubated with F22-EA6-Biotin postinfection. Then, the cells were reacted with Streptavidin-HRP and finally stained by AEC. The inhibitory percentage of IBDV infection was calculated by counting the IBDV-infected cells to determine the inhibition efficiency of the CEF-specific McAbs. 【Result】 Compared with the control cells, the IBDV-infected cells pretreated with CEF-specific antibody significantly decreased; Supernatant fluids of total of 768 hybridomas were analyzed. The results of immunohistochemistry assays showed that six ones (1A5, 1H11, 2B12, 3G1, 4D10 and 4B8) have the abilities to block the infection of IBDV to CEF, and among which 4B8 can perfectly block the infection. 【Conclusion】 This novel method is a sensitive and specific assay for the screening of CEF membrane protein-specific McAbs which can block the infection of IBDV to CEF, and these McAbs can be used for the further investigations of the cellular receptors of IBDV.