Potential histamine H2-receptor antagonists. 2. N-alpha-Guanylhistamine

|August 1, 1975

Summary

Researchers developed Nalpha-guanylhistamine, the first histamine H2-receptor antagonist, by modifying histamine. This compound partially agonizes H2 receptors, inhibiting gastric acid secretion and tachycardia in animal models.

Area of Science:

Pharmacology
Medicinal Chemistry

Background:

Histamine acts as an agonist at H2 receptors.
Histamine stimulates gastric acid secretion and heart rate.

Purpose of the Study:

To design and synthesize novel H2-receptor antagonists.
To evaluate the antagonist and agonist properties of Nalpha-guanylhistamine.

Main Methods:

Chemical modification of histamine to create Nalpha-guanylhistamine.
Inhibition of histamine-stimulated gastric acid secretion in rats.
Inhibition of histamine-stimulated tachycardia in guinea-pig right atrium.

Main Results:

Nalpha-guanylhistamine demonstrated antagonism of H2 receptors.
Effective inhibition of gastric acid secretion (ID50 approx. 800 MUmol/kg, iv).
Effective inhibition of tachycardia (pA2 = 3.9), behaving as a partial agonist.

Conclusions:

Nalpha-guanylhistamine is the first histamine H2-receptor antagonist.
The compound exhibits partial agonism at histamine H2 receptors.
Demonstrated potential for H2-receptor targeted drug development.

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Potential histamine H2-receptor antagonists. 2. N-alpha-Guanylhistamine

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

Related Concept Videos

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