Expression of Histamine H1‐Receptors in Xenopus Oocytes Injected with Messenger Ribonucleic Acid from Bovine Adrenal Medulla: Pertussis Toxin Insensitive Activation of Membrane Chloride Currents

Abstract

Histamine H2‐receptors have been identified in Xenopus oocytes previously microinjected with poly(A) + ribonucleic acid from bovine adrenal glands. Bath application of histamine to ribonucleic acid‐primed oocytes evoked concentration‐dependent, oscillating membrane currents under voltage‐clamp conditions. H1‐receptor specific antagonists clemastine, doxepin, pyrilamine, promethacine, diphenylhydramine, dephenylpyraline and chlorpheniramine, but not H2‐receptor antagonists, cimetidine and ranitidine, inhibited histamine‐induced responses. Membrane currents evoked by bath‐applied histamine were insensitive to pertussis toxin, carried by chloride ions and dependent on intracellular but not extracellular calcium. Copyright © 1990, Wiley Blackwell. All rights reserved