Unstimulated and phytohaemagglutinin preactivated T-LPL cultures were incubated with or without the initial addition of cytokines, anti-CD2 or anti-CD28 antibodies. IFN-gamma mRNA was detected by reverse transcriptase polymerase chain reaction, and protein secretion was measured by enzyme linked immunosorbent assay (ELISA).Results
IFN-gamma mRNA was induced in T-LPLs by IL-12 and IL-15 but not IL-7, whereas IFN-gamma was measured only in IL-12 stimulated T-LPL cultures. IL-12 induced IFN-gamma release was not abrogated by neutralising anti-IL-2 antibody or by cyclosporin A. IL-12 synergised with either anti-CD2 or anti-CD28 antibodies in inducing IFN-gamma synthesis. In preactivated T-LPLs, IL-7 enhanced IFN-gamma release induced by both IL-12 and anti-CD2, whereas IL-15 potentiated only IL-12 induced IFN-gamma synthesis. IL-12 did not induce proliferation of either unstimulated or preactivated T-LPLs and it did not enhance the CD2/CD28 stimulated T-LPL proliferative response. No transcript for IL-12 receptor beta1 subunit was detected in freshly isolated and activated T-LPLs whereas the beta2 subunit mRNA was consistently found in T-LPL samples.Conclusions
IL-12 induces human T-LPLs to produce and release IFN-gamma, and IL-15 and IL-7 cooperate with IL-12 in expanding the IFN-gamma mucosal response.