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Murine Cytomegalovirus Infection-Induced Polyclonal B Cell Activation Is Independent of CD41 T Cells and CD40


Karupiah, G and Sacks, TE and Klinman, DM and Fredrickson, TN and Hartley, JW and Chen, J-H and Morse III, HC, Murine Cytomegalovirus Infection-Induced Polyclonal B Cell Activation Is Independent of CD41 T Cells and CD40, Virology, 240, (1) pp. 12-26. ISSN 0042-6822 (1998) [Refereed Article]

Copyright Statement

Copyright © 1998 by Academic Press

DOI: doi:10.1006/viro.1997.8900


The results of this study demonstrate that murine cytomegalovirus (MCMV) induces polyclonal B cell activation in mice during the acute phase of primary infection. First, flow cytometric analysis revealed that surface expression of CD45R, IgM, and Igk by splenocytes from MCMV-infected mice was significantly reduced with a concomitant increase in the frequency of surface IgG-expressing cells. Second, ELIspot assays demonstrated that the changes revealed by flow cytometry were paralleled by increases in the numbers of IgG-producing cells, especially those secreting IgG2a. Third, the IgG antibodies from MCMV-infected animals reacted against a variety of self and foreign antigens. MCMV-induced B cell activation was independent of CD41 T-cell-mediated help and CD40, since activation was observed in two models of mice deficient for this T cell subset and in mice deficient for CD40. Reverse transcription–polymerase chain reaction analysis showed that mRNA transcripts for the cytokines IL-6, IL-10, and IFN-g were rapidly induced following infection with MCMV, but only IL-6 and IFN-g proteins were detectable by ELISA. In addition, the numbers of cells producing IL-6 and IFN-g were significantly increased in the spleen. The magnitude of the polyclonal B cell activation response was diminished by 50% in IL-6-deficient mice but not in mice lacking IFN-g. In the absence of IFN-g, surface expression and serum levels of IgG2a were reduced while IgG1 expression was increased.

Item Details

Item Type:Refereed Article
Keywords:Herpes virus; T-independent B cell activation; cytomegalovirus
Research Division:Biomedical and Clinical Sciences
Research Group:Immunology
Research Field:Innate immunity
Objective Division:Health
Objective Group:Clinical health
Objective Field:Prevention of human diseases and conditions
UTAS Author:Karupiah, G (Associate Professor Guna Karupiah)
ID Code:142843
Year Published:1998
Web of Science® Times Cited:32
Deposited By:Medicine
Deposited On:2021-02-12
Last Modified:2021-05-18

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