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Abstract

The effects of the H1 and H2 antihistamines on "allergic" histamine release and its inhibition by histamine.

L M Lichtenstein and E Gillespie
Journal of Pharmacology and Experimental Therapeutics February 1975, 192 (2) 441-450;
L M Lichtenstein
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E Gillespie
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Abstract

Antigen-induced, IgE-mediated release of histamine from human basophiles is an in vitro model of allergic reacttions; it is blocked by extracellular histamine, presumably as a result of its ability to increase adenosine 3',5'-monophosphate (cyclic AMP) levels. The H1 antihistamines do not antagonize these effects of histamine but at approximately equal to 1 mM cause histamine release and at approximately equal to 0.1mM inhibit antigen-induced histamine release. The phenothiazine antihistamines are 10-30 fold more potent inhibitors than the rest; other tricyclic antidepressant drugs share this activity. The mechanism of this inhibition, which occurs in both the 1 degree and 2 degree stages of histamine release, is not known but it is not due to partial agonist activity since the anti-H1 drugs cause a significant fall in cyclic AMP levels. The anti-anaphylactic effects of the H1 antagonists probably play no therapeutic role but we suggest that drugs structurally similar to the phenothiazine antihistamines should be developed for clinical testing. The H2 antihistamines block histamine-induced inhibition of histamine release and the increase in cyclic AMP levels, but neither cause nor inhibit histamine release. The K-B values for the anti-H2 drugs (burimamide approximately equal to 5 muM); metiamide approximately equal to 0.5muM); are similar to those described for other H2 receptors.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 192, Issue 2
1 Feb 1975
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Abstract

The effects of the H1 and H2 antihistamines on "allergic" histamine release and its inhibition by histamine.

L M Lichtenstein and E Gillespie
Journal of Pharmacology and Experimental Therapeutics February 1, 1975, 192 (2) 441-450;

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Abstract

The effects of the H1 and H2 antihistamines on "allergic" histamine release and its inhibition by histamine.

L M Lichtenstein and E Gillespie
Journal of Pharmacology and Experimental Therapeutics February 1, 1975, 192 (2) 441-450;
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