Summary
α-Fluoromethylhistidine (α-FMH; 65 mg/kg, i.p.), a specific inhibitor of histidine decarboxylase, significantly decreased the histamine content of the rat right atrium in a time-dependent manner; the maximal decrease of 22.2% was observed 4 h after injection. However, α-FMH had no significant effect on the histamine content of the left atrium or the ventricles. The α-FMH-induced decrease in the right atrial histamine content was not observed in rats pretreated with 6-hydroxydopamine (25 mg/kg, i.p.). Two i.p. injections of 10 and 5 mg/kg of propranolol and the cardioselective β1-adrenoceptor antagonist metoprolol almost completely inhibited the α-FMH-induced histamine decrease. On the other hand, phentolamine (10 mg/kg, i.p.) had no influence on the histamine-decreasing action of α-FMH. These results suggest that in the rat right atrium there is a histamine pool where a rapid turnover of histamine is maintained by normal sympathetic activity.
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Yoshitomi, I., Oishi, R., Itoh, Y. et al. α-Fluoromethylhistidine decreases the histamine content of the rat right atrium under the influence of sympathetic activity. Naunyn-Schmiedeberg's Arch Pharmacol 339, 528–532 (1989). https://doi.org/10.1007/BF00167256
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DOI: https://doi.org/10.1007/BF00167256