Abstract:
:Infection with helper-free, defective MAIDS murine leukemia virus (MuLV) caused a rapid polyclonal activation of B cells in 0.75-, 2-, and 6-month-old C57L/J mice (H-2b, Fv-1n/n), similar to that in C57BL/6 mice (H-2b, Fv-1b/b), which was recognized by elevated plasma immunoglobulin concentrations. However, changes in plasma immunoglobulin levels differed in C57BL/J and C57BL/6 mice. In C57L/J mice, infection resulted in a rapid increase in plasma IgM and IgG2a, and the elevation of IgG2a persisted undiminished for 21 weeks. Levels of IgG2b also became slightly elevated, but those of IgG1 and IgG3 were not significantly affected. Plasma of 6 to 7-month-old C57BL/6 mice contained already high levels of IgM (30-40 mg/ml), which persisted undiminished in uninfected mice but decreased progressively in infected mice to 10% of the original concentration during 25 weeks of observation. In C57BL/6 mice, plasma IgG1 and IgG2b as well as IgG2a became similarly elevated after infection but also only transiently. Their levels began to decrease progressively about 10 weeks after infection and fell to far below the maximum concentration observed. The drastic loss of plasma IgM and IgGs observed in C57BL/6 mice during the later stages of MAIDS MuLV infection did not seem to be a consequence of the polyclonal activation of B cells per se but seemed to reflect additional immunological abnormalities arising in infected C57BL/6 but not C57L/J mice. In both mouse strains these changes in plasma Ig levels correlated with the formation of Ig-containing immune complexes that bound to high-affinity, protein-binding ELISA plates in the absence of antigen coating, which may represent unusual forms of self-antigen-antibody complexes.
journal_name
Viral Immunoljournal_title
Viral immunologyauthors
Even C,Hu B,Erickson L,Plagemann PGdoi
10.1089/vim.1992.5.39subject
Has Abstractpub_date
1992-04-01 00:00:00pages
39-50issue
1eissn
0882-8245issn
1557-8976journal_volume
5pub_type
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