A STUDY ON THE CONTRACTION OF SPLEEN STRIPS IN KIDS AND DOGS, WITH SPECIAL REFERENCE TO THE CHOLINERGIC AND ADRENERGIC RECEPTORS

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概要

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• It has been reported that the splenic smooth muscles of several species of animals can be contracted with noradrenaline (1-4), adrenaline (1, 3-9), isoproterenol (1, 3-5), acetylcholine (5-8), serotonin (7), histamine (1, 7), tyramine (7), angiotensin (10), or BaCl<SUB>2</SUB>. The existence of <I>alpha</I>-adrenergic receptors has been confirmed in the splenic smooth muscles in the cat, dog, kid, rabbit, and human (1, 5, 8, 11). The stimulation of the <I>alpha</I>-adrenergic receptors in the spleen produces contraction of the organ. It is of interest that isoproterenol, which stimulates the <I>beta</I>-adrenergic receptors, contracts the spleen in cats and mice, but the drug relaxes it in mice when the concentration was very low. The isoproterenol-induced contraction of the spleen in cats can be inhibited by dichloroisoproterenol or dibenamine (1), and the isoproterenol-induced relaxation of it in mice can be inhibited by MJ-1999 or propranolol (4). Two explanations are possible for these findings; one is that there are <I>beta</I>-adrenergic receptors in the spleen and the other is that isoproterenol stimulates the alpha-adrenergic receptors in the spleen to produce contraction. As to the mechanism of the contraction of the spleen produced by acetylcholine, Burn and Rand proposed hypothesis in 1960: acetylcholine releases noradrenaline and adrenaline in the spleen, and these catecholamines produce the contraction (12, 13).<BR> The present experiments were undertaken to examine whether there were <I>beta</I>-adrenergic receptors in the spleen, and to confirm the hypothesis proposed by Burn and Rand.

• 社団法人 日本薬理学会の論文

著者

• 高野 静子

  Department Of Pharmacology Fukushima Medical University

• 高野 静子

  Department of Pharmacology, Fukushima Medical College

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• A STUDY ON THE CONTRACTION OF SPLEEN STRIPS IN KIDS AND DOGS, WITH SPECIAL REFERENCE TO THE CHOLINERGIC AND ADRENERGIC RECEPTORS

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