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- W341119455 abstract "The uptake of [14C]-histidine and [14C]-histamine and the conversion of [14C]-histidine to [14C]-histamine was measured in suspensions of guinea-pig bone marrow cells rich in basophils. When comparable amounts of labelled histidine or histamine were added to equal numbers of basophils, the uptake of histidine was approximately forty-five times greater than that of histamine. Purified eosinophils, neutrophils and mononuclear cells incorporated only a small proportion of [14C]-histidine when compared to the basophil; [14C]-histamine uptake by all these cell types was virtually negligible. Histidine uptake and the amount of histamine formed de novo was directly related to the number of basophils, the time of incubation and the substrate concentration. Histidine uptake was decreased by agents which inhibit glycolysis, oxidative phosphorylation, Na + - K + -dependent ATPase, protein synthesis and RNA synthesis. Inhibition was demonstrable in a dose-dependent fashion and at concentrations which had no apparent effect on cell viability. Inhibitors of DNA synthesis, and of microtubule function, had no influence on histidine uptake. Cytochalasin B, an inhibitor of microfilament function, also decreased histidine uptake but only at concentrations previously showen to affect hexose transport. None of the agents tested affected the uptake of [14C]-histamine or the amounts of new histamine formed from the histidine that had been incorporated. These studies suggest that histidine is preferentially incorporated into the basophil; that the uptake depends on the integrity of a number of metabolic pathways, but that once the histidine is taken up these requirements do not apply to the formation of new histamine. In contrast, histamine appeared to diffuse passively, and in relatively small amounts, into all the cell types tested." @default.
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- W341119455 date "1979-03-01" @default.
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- W341119455 title "Metabolic studies on the uptake of [14C]-histidine and [14C]-histamine and histamine synthesis by guinea-pig basophils, in vitro." @default.
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