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• W2146456419 abstract "Histamine H1 receptors mediate activation of phospholipase C, with subsequent increases in cytosolic Ca2+ concentration ([Ca2+]i), and H2 receptors mediate accumulation of cAMP. HL-60 promyelocytes possess H2 receptors, but it is not known whether these cells also possess H1 receptors. We studied the effects of histamine on [Ca2+]i and the functional importance of histamine receptors in HL-60 promyelocytes. In these cells, histamine and dimaprit increased [Ca2+]i with EC50 values of 15 microM and 30 microM, respectively. Diphenhydramine inhibited the effect of histamine (100 microM) on [Ca2+]i up to 40%, with an IC50 of 100 nM. Famotidine and cimetidine diminished the effect of histamine (100 microM) up to 75%, with IC50 values of 85 nM and 300 nM, respectively. Diphenhydramine plus famotidine abolished histamine-induced rises in [Ca2+]i. Impromidine, with an IC50 of 100 nM, abolished the effect of histamine (100 microM) on [Ca2+]i. Diphenhydramine, famotidine, cimetidine, and impromidine showed marked noncompetitive antagonism with histamine. Histamine-induced increases in [Ca2+]i were largely due to influx of Ca2+ from the extracellular space. Ca2+ influx was inhibited by 1-(beta-[3-(4-methoxyphenyl)propoxyl]-4-methoxyphenethyl)-1H-imida zole hydrochloride (SK&F 96365). Histamine activated phospholipase C. Histamine induced expression of formyl peptide receptors, which effect was abolished by famotidine. In U-937 promonocytes and in the human erythroleukemia cell lines HEL and K-562, histamine did not induce rises in [Ca2+]i. Our data suggest the following. (i) In HL-60 promyelocytes, histamine increases [Ca2+]i predominantly via H2 receptors and to a lesser extent via H1 receptors. (ii) The agonist/antagonist profile of the H2 receptor-mediated increases in [Ca2+]i differs markedly from that for cAMP accumulation, suggesting the involvement of different H2 receptor subtypes. (iii) In HL-60 promyelocytes, histamine activates nonselective cation channels and induces functional differentiation via H2 receptors." @default.
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• W2146456419 date "1992-08-01" @default.
• W2146456419 modified "2023-09-23" @default.
• W2146456419 title "Histamine increases cytosolic Ca2+ in HL-60 promyelocytes predominantly via H2 receptors with an unique agonist/antagonist profile and induces functional differentiation." @default.
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