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- W346950133 abstract "Thiazinamium-Cl (T), an analog of promethazine (P), has antiasthmatic activity that may be related to its antihistaminic and anticholinergic actions or its ability to inhibition thromboxane synthesis. To assess phosphatidylcholine (PC) secretion, freshly isolated cells were preincubated with /sup 3/H-choline for 18 h and then incubated in fresh medium +/- test agent for 90 min when /sup 3/H-PC in the cells and medium was measured. PC synthesis was similarly assessed during the latter incubation period by measuring the rate of /sup 3/H-choline incorporation into cellular PC. 10/sup -6/ M T stimulated PC secretion by 46% from 0.92 +/- 0.05 (PC in the medium as % of total) to 1.34 +/- 0.08 (P < 0.01, n = 6). The EC/sub 50/ was 2.9 x 10/sup -8/ M. In comparison, terbutaline (Tb) maximally stimulated PC secretion by 108% at 10/sup -5/ M (P < 0.001, n = 13) and isoproterenol (I) by 112% at 10/sup -7/ M (P < 0.01, n = 5). The EC/sub 50/ values for Tb and I were 1.6 x 10/sup -7/ M and 3.2 x 10/sup -9/ M, respectively. T did not stimulate PC synthesis nor increase lactate dehydrogenase release. Thus, the effect on secretion was notmore » due to increased synthesis or to cell injury. The effect of T on PC secretion was mimicked by 10/sup -6/M P (48% stimulation, P < 0.01, n = 7) and by 10/sup -5/M pyrilamine, a structurally dissimilar antihistamine, (52% stimulation, P < 0.002, n = 7). The effects of T or pyrilamine and of Tb were additive suggesting a different mechanism of action. Although histamine did not inhibit PC secretion it may play a physiologic role in its regulation.« less" @default.
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- W346950133 date "1986-05-01" @default.
- W346950133 modified "2023-09-23" @default.
- W346950133 title "Effects of thiazinamium chloride on surfactant production in primary cultures of type II cells isolated from adult rat lung" @default.
- W346950133 hasPublicationYear "1986" @default.
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