Further Evidence that (.+-.)-Carteolol-induced Relaxation is Mediated by .BETA.2-Adrenoceptors but not by .BETA.3-Adrenoceptors in the Guinea Pig Taenia Caecum.
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- HORINOUCHI Takahiro
- Department of Chemical Pharmacology, Toho University School of Pharmaceutical Sciences
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- KOIKE Katsuo
- Department of Chemical Pharmacology, Toho University School of Pharmaceutical Sciences
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The properties of the β1- and β2-adrenoceptor partial agonist (±)-carteolol were investigated against the β2- and β3-adrenoceptors of the taenia caecum of the guinea pig. (−)-Isoprenaline and (±)-carteolol induced concentration-dependent relaxation in this tissue. The non-selective β1- and β2-adrenoceptor antagonist (±)-propranolol (10-100 nM), the selective β2-adrenoceptor antagonist ICI 118, 551 (10-100 nM) and the non-selective β1, - β2- and β3-adrenoceptor antagonist (±)-bupranolol (10-100n M), caused a concentration-dependent rightward shift of the concentration-response curves for (−)-isoprenaline and (±)-carteolol. Schild regression plot analyses carried out for (±)-propranolol against (−)-isoprenaline and (±)-carteolol gave pA2 values of 8.35 and 8.24, respectively. Schild plot analyses of ICI 118, 551 against (−)-isoprenaline and (±)-carteolol gave pA2 values of 8.47 and 8.41, respectively Schild plot analyses of (±)-bupranolol against (−)-isoprenaline and (±)-carteolol gave pA2 values of 8.47 and 8.53, respectively. Slopes of the Schild plots were not significantly different from unity. These results suggest that the relaxant effects of (±)-carteolol in the guinea pig taenia caecum are mediated by β2-adrenoceptors but not by β3-adrenoceptors.
収録刊行物
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- Journal of Smooth Muscle Research
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Journal of Smooth Muscle Research 36 (5), 145-153, 2000
日本平滑筋学会
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詳細情報 詳細情報について
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- CRID
- 1390001205055992448
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- NII論文ID
- 110002929815
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- NII書誌ID
- AN10364204
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- COI
- 1:CAS:528:DC%2BD3MXitlKmsr8%3D
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- ISSN
- 18848796
- 09168737
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- PubMed
- 11286298
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- PubMed
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- 使用不可