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- W2394559145 abstract "In previous studies we have reported that patients with mild atopic eczema have enhanced lymphocyte mitogenesis while those with severe disease have markedly suppressed responses. Similarly, histamine in low concentrations enhanced mitogenesis while higher levels inhibit mitogen stimulated thymidine uptake. In the present study, we investigated the kinetics of this response and the interaction of histamine with its cell-surface receptors on lymphocytes. Histamine (10(-3) M) markedly inhibited [3H]-thymidine incorporation to 27% of control levels when added at the beginning of a 72 h culture period. When added after 24 and 48 h of culture, however, the suppression was much less (62 and 88% of control). Lymphocyte cultures pulsed for 1 h with histamine, washed free of the agent and then cultured with mitogen also showed marked suppression of [3H]-thymidine uptake. The kinetics of the response suggest that histamine acts to inhibit initial processing or recruitment steps in the mitogenic assay. Cimetidine, an H2-receptor blocking agent, prevented the suppressive effect of high levels of histamine while diphenhydramine, an H1 blocker, abolished the enhancement observed with low levels. Pre-incubation of mononuclear cell suspensions, which has been shown to decrease suppressor activity, resulted in a decreased response to added histamine. This change in histamine responsiveness was associated with an alteration in H1:H2 histamine binding as determined with a radiolabelled ligand-binding assay. Histamine suppression of mitogenesis was associated with an increase in cellular cAMP levels while enhancement was accompanied by a small increase in cGMP. These data suggest that lymphocyte function may be regulated, in part, by histamine receptor bearing cells with H1 stimulation having a role in enhancement of mitogenesis and H2 stimulation resulting in normal suppressor activity." @default.
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- W2394559145 date "1980-09-01" @default.
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- W2394559145 title "Histamine regulates lymphocyte mitogenic responses through activation of specific H1 and H2 histamine receptors." @default.
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