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Journal of Virology, January 2000, p. 203-208, Vol. 74, No. 1
0022-538X/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

B7 Costimulation Is Critical for Antibody Class Switching and CD8+ Cytotoxic T-Lymphocyte Generation in the Host Response to Vesicular Stomatitis Virus

Alexander J. McAdam,1,* Evan A. Farkash,2 Benjamin E. Gewurz,1 and Arlene H. Sharpe1

Departments of Pathology, Brigham and Women's Hospital and Harvard Medical School1 and Harvard University,2 Boston, Massachusetts 02115

Received 30 July 1999/Accepted 27 September 1999

Antibody and cytotoxic T-lymphocyte (CTL) responses have critical roles in eliminating many viral infections. In addition to stimulation of the T-cell receptor, T cells require costimulatory signals to respond optimally. We evaluated the role of B7 costimulatory molecules (B7-1 and B7-2) in the immune response to viral infection using vesicular stomatitis virus (VSV) and mice lacking either B7-1 or B7-2 or both molecules. Mice lacking both B7-1 and B7-2 had essentially no anti-VSV immunoglobulin G1 (IgG1) response, decreased IgG2a responses, and normal IgM responses, while mice lacking either B7-1 or B7-2 had unaltered anti-VSV antibody responses compared to wild-type mice. Depletion of CD4+ cells further reduced the IgG2a response in mice lacking both B7 molecules, suggesting that CD4- cells may supply help for IgG2a in the absence of B7 costimulation. The absence of both B7 molecules profoundly reduced generation of both primary and secondary VSV-specific class I major histocompatibility complex (MHC)-restricted CTL, whereas VSV-specific CTL responses in mice lacking either B7-1 or B7-2 were similar to those of wild-type animals. Class I MHC-restricted CTL in wild-type mice were not dependent on CD4+ cells, suggesting that the failure of CTL in the absence of B7s is due to a lack of B7 costimulation directly to the CD8+ CTL. These data demonstrate that B7-1 and B7-2 have critical, overlapping functions in the antibody and CTL responses to this viral infection.

* Corresponding author. Mailing address: Department of Pathology, LMRC 5th floor, 221 Longwood Ave., Boston, MA 02115. Phone: (617) 278-0317. Fax: (617) 732-5795. E-mail: ajmcadam{at}bics.bwh.harvard.edu.

Journal of Virology, January 2000, p. 203-208, Vol. 74, No. 1
0022-538X/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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