Effects of Adrenergic .ALPHA.2-Receptor Agonists on Urinary Bladder Contraction in Conscious Rats.
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- Kontani Hitoshi
- Department of Pharmacology, Faculty of Pharmaceutical Science, Hokuriku University, Kanagawa-machi, Kanazawa 920-1181, Japan
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- Tsuji Toshitsugu
- Department of Pharmacology, Faculty of Pharmaceutical Science, Hokuriku University, Kanagawa-machi, Kanazawa 920-1181, Japan
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- Kimura Satoko
- Department of Pharmacology, Faculty of Pharmaceutical Science, Hokuriku University, Kanagawa-machi, Kanazawa 920-1181, Japan
Bibliographic Information
- Other Title
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- Effects of Adrenergic α2-Receptor Agonists on Urinary Bladder Contraction in Conscious Rats
- Effects of Adrenergic アルファ 2 Receptor Agonists on Urinary Bladder Contraction in Conscious Rats
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Abstract
We investigated the effects of the adrenergic α2-receptor agonists clonidine, oxymetazoline and tizanidine on bladder contractions induced by infusing fluid into the bladders of conscious male rats. I.v. clonidine and oxymetazoline (both 0.01 to 0.1 mg/kg) caused bladder hyperactivity, expressed by shortening of the intercontraction interval. Tizanidine (0.1 mg/kg, i.v.) caused slight shortening of the intercontraction interval. The rank order of potency was clonidine=oxymetazoline >> tizanidine. Intrathecal (i.t.) injection of 10 μg clonidine and oxymetazoline, and intracerebroventricular (i.c.v) injection at 15 μg, produced almost the same pattern of bladder hyperactivity as that observed after i.v. injection of these drugs (0.03 mg/kg, i.v.). For all three administration routes of clonidine and oxymetazoline, i.v. idazoxan (0.3 mg/kg) exerted an inhibitory effect on the bladder hyperactivity induced by these drugs, except i.c.v injection of oxymetazoline. I.t. phenylephrine (30 μg) did not change the intercontraction interval. Although i.c.v. phenylephrine (15 μg) shortened the intercontraction interval, the potency was weaker than those of i.c.v. clonidine and oxymetazoline (15 μg). These results suggest that clonidine and oxymetazoline cause bladder hyperactivity by acting at adrenergic α2 receptors in the micturition centers of the lumbosacral and supraspinal regions.
Journal
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- The Japanese Journal of Pharmacology
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The Japanese Journal of Pharmacology 84 (4), 381-390, 2000
The Japanese Pharmacological Society
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Details 詳細情報について
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- CRID
- 1390282679263861376
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- NII Article ID
- 10008186532
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- NII Book ID
- AA00691188
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- COI
- 1:CAS:528:DC%2BD3MXpt1Cj
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- ISSN
- 13473506
- 00215198
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- NDL BIB ID
- 5611954
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- PubMed
- 11202609
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- Web Site
- https://ndlsearch.ndl.go.jp/books/R000000004-I5611954
- https://api.elsevier.com/content/article/PII:S0021519819304846?httpAccept=text/xml
- https://api.elsevier.com/content/article/PII:S0021519819304846?httpAccept=text/plain
- https://www.jstage.jst.go.jp/article/jjp/84/4/84_4_381/_pdf
- https://search.jamas.or.jp/link/ui/2001141049
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed