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J Gen Virol 72 (1991), 617-622; DOI 10.1099/0022-1317-72-3-617
© 1991 Society for General Microbiology
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Characterization of two monoclonal antibodies against feline immunodeficiency virus gag gene products and their application in an assay to evaluate neutralizing antibody activity

Miguel Fevereiro, Carol Roneker, Annemarie Laufs, Luis Tavares and Fernando de Noronha

Department of Veterinary Microbiology, Immunology and Parasitology, New York State College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, U.S.A.

Monoclonal antibodies (MAbs) 3B7 and 1C11 were produced against the gag gene products of feline immunodeficiency virus (FIV). These MAbs reacted strongly with FIV p24 in Western blots (immunoblots) and recognized p50 with a lower intensity. They specifically bound antigens in the cytoplasm of FIV-infected cells as determined by indirect immuno-fluorescence and immunocytochemistry. Although neither MAb inhibited viral replication in vitro, they were useful in a simple assay for the detection and quantification of infectious virus and neutralizing antibody activity. The assay utilizes Crandell feline kidney cells and requires 4 days for completion. Neutralizing antibodies in cats were detected 3 to 4 weeks after experimental infection with FIV. Antibody titres progressively increased during the first year of infection reaching high titres which were maintained 2.5 years post-infection. The MAbs produced should be valuable reagents for the monitoring of viral replication in cells or tissues from FIV-infected cats and for other in vitro applications.

Received 9 August 1990; accepted 6 November 1990.




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Copyright © 1991 by the Society for General Microbiology.