Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (7): 1963-1974.doi: 10.11843/j.issn.0366-6964.2021.07.018

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Preparation and Identification of Monoclonal Antibodies with Cross-neutralizing Activity against Duck Hepatitis A Virus Serotype 1 and 3

LIU Yan1,2, TANG Cheng1, YUE Hua1, WANG Yuanwei1*   

  1. 1. College of Animal Science and Veterinary Medicine, Southwest Minzu University, Chengdu 610041, China;
    2. Guanghan Agricultural and Rural Bureau, Deyang 618300, China
  • Received:2020-10-28 Online:2021-07-23 Published:2021-07-23

Abstract: Duck hepatitis A (DHA), an acute and highly lethal infection in ducklings, is one of the main diseases threatening the duck industry. The purpose of this study was to develop a monoclonal antibody (McAb) that has cross-neutralization activity against two most prevalent serotypes of DHAV in China, DHAV-1 and DHAV-3. Twelve epitope peptides shared by VP1 proteins of DHAV-1 and DHAV-3 were synthesized artificially and respectively conjugated with keyhole limpet hemocyanin (KLH) protein. BALB/c mice were then immunized with those antigens and McAbs were prepared. The obtained McAbs were screened by detecting the cross-reactivity with DHAV-1 and DHAV-3, the inhibitory efficiency on virus proliferation, the neutralization titer, and the protection rate against virus infection. A total of 12 hybridomas were obtained, the McAbs secreted by 6 hybridomas (C1, C4, C7, C12, C13, C16) in those had specific cross-reactions with DHAV-1 and DHAV-3. The McAbs secreted by hybridomas (C1, C4, C7 and C16) had higher inhibitory efficiency on DHAV-1 and DHAV-3 proliferation in duck embryos, ranging from 75.34% to 100.00%. The neutralization titer of McAbs secreted by hybridomas (C1, C4, C7 and C16) against DHAV-1 and DHAV-3 were 1:3 & 1:5, 1:3 & 1:3, 1:10 & 1:11, 1:9 & 1:9, respectively. The protection rate of McAbs secreted by hybridomas (C7 and C16) against DHAV-1 and DHAV-3 infection were 70% & 80%, 100% & 60%, respectively. In this study, four McAbs with cross-neutralizing activity against DHAV-1 and DHAV-3 were developed, two of those had a higher protection rate against virus infection, providing new materials and ideas for the prevention and control of DHA.

Key words: duck hepatitis A, sero 1-type, sero 3-type, monoclonal antibody, cross-neutralizing activity

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