Effects of N-alpha-methyl-histamine on Human H(2) Receptors Expressed in CHO Cells

Overview

Journal Gut

Specialty Gastroenterology

Date 2002 May 16

PMID 12010879

Citations 6

Authors

T Saitoh

Y Fukushima

H Otsuka

M Ishikawa

M Tamai

H Takahashi

H Mori

T Asano

M Anai

T Ishikawa

T Katsube

K Ogawa

T Kajiwara

M Omata

S Ohkawa

Affiliations

Soon will be listed here.

Abstract

Background: Production of N-alpha-methyl-histamine (NAMH), a histamine H(3) receptor (H3R) agonist, is reportedly promoted in Helicobacter pylori infected human gastric mucosa. NAMH was suggested to act directly on histamine H(2) receptors (H2Rs) in animals to stimulate acid secretion and to be a H2R agonist. As H2Rs and H3Rs play different roles in gastric acid secretion, it is very important to verify that NAMH is a H2R agonist.

Aims: To determine whether NAMH is a H2R agonist, as well as a H3R agonist.

Methods: We used a Chinese hamster ovary (CHO) cell line expressing human H2Rs (CHO-H2R) and control CHO cells. Expression of human H2Rs was confirmed by tiotidine binding. cAMP production in CHO-H2R and control cells in response to histamine or NAMH was measured. cAMP production in response to 10(-7) M NAMH was also measured in the presence or absence of the H2R antagonist famotidine and the H3R antagonist thioperamide.

Results: NAMH dose dependently stimulated cAMP productions in CHO-H2R cells. This production was inhibited by famotidine but not by thioperamide. Control CHO cells were unresponsive to either histamine or NAMH. In addition, the effect of NAMH, in terms of cAMP production in CHO-H2R cells, was more potent than that of histamine-that is, with a lower EC(50) concentration and higher maximal cAMP production. Both NAMH and histamine, but not R-alpha-methyl-histamine, effectively inhibited [(3)H] tiotidine binding to CHO-H2R cells.

Conclusions: NAMH, which is produced in the gastric mucosa by H pylori, is a potent H2R agonist as well as a H3R agonist.

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