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Influenza viruses as lymphocyte mitogens. I. B cell mitogenesis by influenza A viruses of the H2 and H6 subtypes is controlled by the I-E/C subregion of the major histocompatibility complex.
Influenza A viruses of the H2, H3, and H6 subtypes function as T cell-independent B cell mitogens for lymphocytes from BALB/c mice. Lymphocytes from C57BL/10 mice, however, undergo mitogenesis only in response to H3 viruses. The failure of C57BL/10 lymphocytes to respond to H2 and H6 viruses was shown not to reflect a difference in dose-response profile or kinetics of the response, nor was it due to the activity of suppressor T cells. Experiments with congenic and recombinant strains of mice established that mitogenic responsiveness to H2 and H6 viruses is linked to the major histocompatibility complex, and is controlled by a gene located in the I-E/C subregion. Furthermore, responsiveness was shown to correlate with the expression of surface I-E antigen, being positive for mouse strains that express I-E antigen (haplotypes a, d, k, p, r) and negative for strains that do not (haplotypes b, f, q, s). The data suggest that influenza A viruses of the H2 and H6 subtypes may interact directly with I-E molecules on the surface of B cells or possibly on an accessory cell. Because mitogenesis by H3 viruses is not I-E dependent, it appears that influenza A viruses stimulate B cell mitogenesis by at least two different mechanisms.[1]References
- Influenza viruses as lymphocyte mitogens. I. B cell mitogenesis by influenza A viruses of the H2 and H6 subtypes is controlled by the I-E/C subregion of the major histocompatibility complex. Scalzo, A.A., Anders, E.M. J. Immunol. (1985) [Pubmed]
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