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Immune dysfunction in primary biliary cirrhosis (PBC): I. Increased sensitivity of PHA stimulated lymphocyte cultures to indomethacin.

A reduced responsiveness of peripheral blood lymphocytes from PBC patients to phytohaemagglutinin (PHA) was observed. Such an alteration may be related either to an intrinsic defect of T cells to proliferate or to a derangement of endogenously secreted mediators with regulatory functions, i.e., prostaglandins (PG). The role of the PG mediated suppressor system in 14 PBC patients and in 12 age and sex matched controls was evaluated. After the addition of indomethacin, the lymphocyte responsiveness to PHA increased in both controls and in PBC patients. However, this increment was statistically significantly only in PBC patients. The addition of PGE1 and PGE2 to PHA stimulated cultures decreased the lymphocyte proliferative activity. No differential sensitivity to PGEs was detectable in lymphocytes from PBC patients. Our data suggest, that, after polyclonal stimulation, mononuclear cells from PBC patient may release increased levels of PGEs which in turn affect the proliferative activity of mitogen activated lymphocytes.