Evaluation of the role of Histamine H1- and H2-receptors in cutaneous inflammation in the guinea-pig produced by histamine and mast cell degranulation

British Journal of Pharmacology
D A OwenD Daniel

Abstract

1 The role of histamine H1- and H2-receptors in mediating the cutaneous inflammatory response produced by exogenous histamine and the release of endogenous histamine from mast cells has been investigated by a method which permits simultaneous, quantitative measurement of vasodilatation, vascular permeability and oedema formation. 2 Histamine and the selective H1-receptor agonist, 2-(2-aminoethyl) pyridine, both produced vasodilatation, increased vascular permeability and oedema formation whereas the selective H2-receptor agonist, dimaprit, produced only vasodilatation. 3 Mepyramine and cimetidine both reduced the vasodilatation response to histamine, the combination of antagonists being superior to either antagonist alone. Mepyramine (but not cimetidine) virtually abolished extravascular albumin accumulation and oedema formation. 4 Mepyramine and cimetidine both reduced the vasodilatation response produced by active cutaneous anaphylaxis and compound 48/80. However, mepyramine was less effective in reducing the vascular permeability response to mast cell degranulation than to histamine. 5 In conclusion, the vasodilator response to histamine is mediated by both H1- and H2-receptors; the permeability response to histamine is medi...Continue Reading

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