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- W2022272368 abstract "Horses suffer from a respiratory condition, similar to human allergic asthma, that is characterized by severe dyspnea, wheezing, coughing, and mucus production. Mediator substances released during the allergic reaction may contract airways and pulmonary vasculature. Nothing is known of the effects of autacoids and other vasoactive substances on equine pulmonary vessels. Therefore, spiral strips of equine pulmonary vein were prepared in vitro and the effects of histamine (H), 5-hydroxytryptamine (5HT), bradykinin (BK), carbachol (Carb), and phenylephrine (phen) were studied. The order of contractile effectiveness for the agonists on the vein was found to be 5HT greater than H greater than Bk greater than Phen greater than Carb, although H consistently produced the greatest maximal effects. H1-receptors appeared to mediate H contractions while H2-receptors had no measurable effect. 5HT responses were mediated directly by 'D-type' smooth muscle receptors. Bk produced contractions but of a lesser magnitude than either H or 5HT. Varying degrees of tachyphylaxis were observed for each agent. alpha-Adrenergic receptor stimulation by Phen initiated low-magnitude contractions whereas Carb exhibited virtually no activity on the pulmonary vein. Contractile responses of pulmonary veins to various spasmogens may contribute to the equine asthmatic response by raising vascular hydrostatic pressure, thereby enhancing edema formation." @default.
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- W2022272368 date "1978-10-01" @default.
- W2022272368 modified "2023-09-25" @default.
- W2022272368 title "Pharmacological studies on the pulmonary vein of the horse. I. Effects of selected spasmogens" @default.
- W2022272368 doi "https://doi.org/10.1139/y78-127" @default.
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