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Abstract:

Cumulative dose-response curves for histamine induced responses in mesometrial (ME) and antimesometrial (AME) regions of uterine horns isolated from rats at 7th, 16th and 22nd days of pregnancy, were constructed. Histamine inhibited, in dose-related fashion, the isometric developed tension in ME and AME strips obtained at the 7th day of pregnancy, an action antagonized by cimetidine (10-4-10-5M). On the contrary, at the 16th and 22nd days, histamine (10-5-10-3M), stimulated spontaneous contractions in the ME region but had no effect in the AME segment. Although histamine and SKF-71481-A2,aH1-receptor agonist, both at 10-4M, enhanced similarly ME inotropism at the 16th and at 22nd days of pregnancy, the positive contractile action of histamine was greater at the 16th than at the 22nd day. Moreover, cumulative dose-response curves for histamine and SKF-71481-A2 in the ME region of uteri isolated at the 16th day of gestation, showed that both agonists have approximately the same inotropic potency and efficacy. On the other hand, pyrilamine (at 10-4M, but not at 10-5M),aH1-receptor antagonist, shifted to the right the dose-response curve for histamine in ME strips from uteri at the 16th day of pregnancy and attenuated significantly, the magnitude of the positiue inotropism evoked by the amine. Similar findings were observed in the presence of chlorpheniramine (at 10-6M) another H1-receptor blacker. In addition, the positive uterine inotropism evoked by histamine in the ME region of preparations isolated at the 16th day of pregnancy, was significantly reduced by an antagonist of phospholipase A2 (mepacrine, 10-4M) as well as by acetylsalicylic acid (ASA at 10-4M), an inhibitor of cyclooxygenase. Results also indicate that the excitatory uterine inotrpism elicited by the agonistic amine in ME strips isolated from rats at the 16 th day of pregnancy, was coincident with an enhanced release of prostaglandins (PGs) E2 and F2 α, but not of PGE1 and that both augmenting actions of histamine were antagonized by histamine H1 receptor-blockers, namely pyrilamine (mepyramine or chlorpheniramine. Results suggest that histamine at early pregnancy diminished myometrial inotropism via its interaction with H2-receptors, whereas from mid pregnancy up to the moment of parturition it evokes contractile stimulation, most likely due to the activation of H1-receptor located at the mesometrial region of rat uterine horns. Altogether the present data suggest that after mid pregnancy, histamine acts at the ME region of the uterus through a cascade of influences: (a) activation of H1 receptors, (b) stimulation of phospholipase A2 (via an increased permeability of calcium ions?), which catalyzes the release of a PG fatty acid precursor (most likely arachidonic acid rather than dihomo-gamma-linolenic acid) providing a substrate for cyclo-oxygenase and further enzymes involved in the synthesis of bioactive lipid metabolites of the 2 series (PGE2 and PGF2 α), and as a consequence,(c) induction of positive myometrial inotropism. © 1997.

Registro:

Documento: Artículo
Título:Is there a prostaglandin involvement in the positive inotropic action of histamine in isolated pregnant rat uterus, apparently mediated via H1-receptors activation?
Autor:Viggiano, M.; Franchi, A.M.; Dveksler, G.; Gimeno, M.F.; Gimeno, A.L.
Filiación:Centro de Estudios Farmacológicos y de Principios Naturales (CEFAPRIN), Consejo Nacional de-Investigaciones Cientificas y Tecnicas de la Republics Argentina (CONICET). Serr, 1414 Buenos Aires, Argentina
Palabras clave:acetylsalicylic acid; chlorpheniramine; cimetidine; histamine; histamine h1 receptor; histamine h1 receptor antagonist; mepacrine; mepyramine; phospholipase; prostaglandin; prostaglandin synthase; animal cell; dose response; drug mechanism; inotropism; nonhuman; pregnancy; uterus horn; Alprostadil; Animal; Aspirin; Chlorpheniramine; Cimetidine; Dinoprost; Dinoprostone; Female; Histamine; Pregnancy; Prostaglandins; Prostaglandins E; Prostaglandins F; Pyrilamine; Quinacrine; Rats; Receptors, Histamine; Receptors, Histamine H1; Stimulation, Chemical; Support, Non-U.S. Gov't; Uterine Contraction
Año:1987
Volumen:28
Número:3
Página de inicio:285
Página de fin:302
DOI: http://dx.doi.org/10.1016/0262-1746(87)90118-1
Título revista:Prostaglandins, Leukotrienes and Medicine
Título revista abreviado:Prostaglandins Leukotrienes Med.
ISSN:02621746
CODEN:PLMED
CAS:acetylsalicylic acid, 493-53-8, 50-78-2, 53663-74-4, 53664-49-6, 63781-77-1; chlorpheniramine, 132-22-9; cimetidine, 51481-61-9, 70059-30-2; histamine, 51-45-6, 56-92-8, 93443-21-1; mepacrine, 69-05-6, 83-89-6; mepyramine, 6036-95-9, 91-84-9; phospholipase, 9013-93-8; prostaglandin synthase, 39391-18-9, 59763-19-8, 9055-65-6; Alprostadil, 745-65-3; Aspirin, 50-78-2; Chlorpheniramine, 132-22-9; Cimetidine, 51481-61-9; Dinoprost, 551-11-1; Dinoprostone, 363-24-6; Histamine, 51-45-6; Prostaglandins E; Prostaglandins F; Prostaglandins; Pyrilamine, 91-84-9; Quinacrine, 83-89-6; Receptors, Histamine H1; Receptors, Histamine
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02621746_v28_n3_p285_Viggiano

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Citas:

---------- APA ----------
Viggiano, M., Franchi, A.M., Dveksler, G., Gimeno, M.F. & Gimeno, A.L. (1987) . Is there a prostaglandin involvement in the positive inotropic action of histamine in isolated pregnant rat uterus, apparently mediated via H1-receptors activation?. Prostaglandins, Leukotrienes and Medicine, 28(3), 285-302.
http://dx.doi.org/10.1016/0262-1746(87)90118-1
---------- CHICAGO ----------
Viggiano, M., Franchi, A.M., Dveksler, G., Gimeno, M.F., Gimeno, A.L. "Is there a prostaglandin involvement in the positive inotropic action of histamine in isolated pregnant rat uterus, apparently mediated via H1-receptors activation?" . Prostaglandins, Leukotrienes and Medicine 28, no. 3 (1987) : 285-302.
http://dx.doi.org/10.1016/0262-1746(87)90118-1
---------- MLA ----------
Viggiano, M., Franchi, A.M., Dveksler, G., Gimeno, M.F., Gimeno, A.L. "Is there a prostaglandin involvement in the positive inotropic action of histamine in isolated pregnant rat uterus, apparently mediated via H1-receptors activation?" . Prostaglandins, Leukotrienes and Medicine, vol. 28, no. 3, 1987, pp. 285-302.
http://dx.doi.org/10.1016/0262-1746(87)90118-1
---------- VANCOUVER ----------
Viggiano, M., Franchi, A.M., Dveksler, G., Gimeno, M.F., Gimeno, A.L. Is there a prostaglandin involvement in the positive inotropic action of histamine in isolated pregnant rat uterus, apparently mediated via H1-receptors activation?. Prostaglandins Leukotrienes Med. 1987;28(3):285-302.
http://dx.doi.org/10.1016/0262-1746(87)90118-1