The in vitro response of lymphocytes obtained from normal subjects, uraemic patients on haemodialysis and diabetic patients was studied using cultures containing either medium plus plasma (medium cultures) or plasma alone (plasma cultures). The study demonstrated that plasma alone can adequately support lymphocyte transformation induced by nonspecific mitogens (PHA and PWM) and allogeneic lymphocytes in mixed lymphocyte culture (MLC) reaction. This investigation further confirms our previously reported findings that uraemic patients undergoing haemodialysis have a normal lymphocyte response in MLC and to PHA and PWM. Plasma cultures give results similar to conventional medium cultures in subjects where lymphocyte transformation is normal. The lymphocyte hyporeactivity observed in diabetics is, however, better shown in the plasma cultures. The suppressed response of the diabetic patient’s lymphocytes to PHA and PWM both in the presence of autologous and normal AB plasma suggests intrinsic lymphocyte dysfunction as the explanation for impaired immune function. Plasma cultures may provide a better in vitro system for the evaluation of immune function in certain groups of patients where it is desirable to distinguish between intrinsic abnormalities of lymphocyte function and the effect of humoral immunosuppressive factors.

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© 1976 S. Karger AG, Basel
1976
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