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. 1996 Jan;70(1):402–414. doi: 10.1128/jvi.70.1.402-414.1996

AKR.H-2b lymphocytes inhibit the secondary in vitro cytotoxic T-lymphocyte response of primed responder cells to AKR/Gross murine leukemia virus-induced tumor cell stimulation.

R F Rich 1, W R Green 1
PMCID: PMC189830  PMID: 8523554

Abstract

We have previously shown that AKR.H-2b congenic mice, though carrying the responder H-2b major histocompatibility complex haplotype, are unable to generate secondary cytolytic T-lymphocyte (CTL) responses specific for AKR/Gross murine leukemia virus (MuLV). Our published work has shown that this nonresponsive state is specific and not due to clonal deletion or irreversible functional inactivation of antiviral CTL precursors. In the present study, an alternative mechanism based on the presence of inhibitory AKR.H-2b cells was examined. Irradiated or mitomycin C-treated AKR.H-2b spleen cells function as in vitro stimulator cells in the generation of C57BL/6 (B6) anti-AKR/Gross virus CTL, consistent with their expression of viral antigens. In contrast, untreated viable AKR.H-2b spleen cells functioned very poorly as stimulators in vitro. Viable AKR.H-2b spleen cells were also able to cause dramatic (up to > or = 25-fold) inhibition of antiviral CTL responses stimulated in vitro by standard AKR/Gross MuLV-induced tumor cells. This inhibition was specific: AKR.H-2b modulator spleen cells did not inhibit allogeneic major histocompatibility complex-specific CTL production, even when a concurrent antiviral CTL response in the same culture well was inhibited by the modulator cells. These results and those of experiments in which either semipermeable membranes were used to separate AKR.H-2b modulator spleen cells from AKR/Gross MuLV-primed responder cells or the direct transfer of supernatants from wells where inhibition was demonstrated to wells where there was antiviral CTL responsiveness argued against a role for soluble factors as the cause of the inhibition. Rather, the inhibition was dependent on direct contact of AKR.H-2b cells in a dose-dependent manner with the responder cell population. Inhibition was shown not to be due to the ability of AKR.H-2b cells to function as unlabeled competitive target cells. Exogenous interleukin-2 added at the onset of the in vitro CTL-generating cultures partially restored the antiviral response that was decreased by AKR.H-2b spleen cells. Positive and negative cell selection studies and the development of inhibitory cell lines indicated that B lymphocytes and both CD4- CD8+ and CD4+ CD8- T lymphocytes from AKR.H-2b mice could inhibit the generation of AKR/Gross virus-specific CTL in vitro. AKR.H-2b macrophages were shown not to be required to demonstrate AKR/Gross MuLV-specific inhibition, however, confirming that the inhibition by T-cell (or B-cell)-depleted spleen populations was dependent on the enriched B-cell (T-cell) population per se.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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