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Whole mononuclear cells plated on surfaces coated with the polymer, poly (2-hydroxyethyl methacrylate) (poly-HEMA) produced significantly less C2 when compared to production by cells on tissue culture plastic dishes. The reduction in C2 production was dependent on the amount of poly-HEMA used to coat the dishes and was not due to nonspecific damage of the cells or effects of the poly-HEMA on the hemolytic activity of C2. T and B lymphocytes, but not monocytes, plated on tissue culture plastic produced a soluble factor that increased the production of C2 in freshly adherent monocytes. Lymphocytes plated on the poly-HEMA surface did not produce this soluble factor, which was termed surface-dependent factor (SDF). Whole mononuclear cells plated on poly-HEMA were able to respond to SDF by increasing C2 production by the same percentage as cells on the tissue culture plastic. This suggested that the primary basis for the decreased production of C2 by monocytes in the whole mononuclear cells plated on the poly-HEMA was decreased production of SDF by the lymphocytes. The effect of the poly-HEMA surface on C2 production was probably related to a generalized alteration in maturation of monocytes into macrophages, for SDF had the same type of effect on beta-glucosaminidase levels in monocytes as seen with C2, except that the magnitude of the effect was less. These studies suggest that interaction of lymphocytes with surfaces may modulate the function of the lymphocytes. In addition, interaction of lymphocytes with surfaces and the production of SDF in vivo may be responsible for enhancing maturation of monocytes in tissues.
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