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Abnormalities of in vitro immunoglobulin production in apparently healthy haemophiliacs: relationship with alterations of T cell subsets and with HTLV-III seropositivity.

The pokeweed mitogen (PWM)-induced immunoglobulin (Ig) production by cultures of peripheral blood mononuclear cells (PBMC) was reduced in healthy haemophiliacs treated with commercial factor VIII (or IX) concentrate, whereas the spontaneous IgG synthesis in vitro was enhanced. PWM-induced Ig production was lower in those who had received greater amounts of concentrate, in those with inverted T4/T8 lymphocyte ratios and in those with antibody to HTLV-III. The spontaneous IgG production in vitro was higher in haemophiliacs who had received larger amounts of concentrate, in those with inverted T4/T8 ratio and in those with antibody anti-HTLV-III. However, some patients with normal T4/T8 ratio and some with HTLV-III antibody also had raised spontaneous IgG production.