Role of the .ALPHA.-adrenergic blocking effect in the acute hypotensive effect of .BETA.-adrenergic blocking drugs with .ALPHA.-blocking activities in conscious SHR.
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概要
- 論文の詳細を見る
Acute hypotensive effects and the mechanisms of three β-adrenergic blocking drugs with α-blocking activity were studied in comparison with those of prazosin, propranolol and hydralazine in the conscious spontaneously hypertensive rat (SHR). Prazosin lowered the blood pressure dose-dependently and inhibited the pressor response to phenylephrine. Three β-adrenergic blocking drugs with α-blocking activity, labetalol (30 mg/kg), arotinolol (100 mg/kg) and nipradilol (100 mg/kg) also lowered the blood pressure to the same extent as prazosin (0.3 mg/kg), but the inhibition of the pressor response to phenylephrine produced by them was disproportionately slight. Propranolol (100 mg/kg) did not lower the blood pressure. These results suggest that the acute hypotensive effects of three β-adrenergic blocking drugs with α-blocking activity were attributable only partially to the α-adrenergic blocking effect; a mechanism or mechanisms other than the α-adrenergic blocking effect must be invoked to explain the acute hypotensive effect produced by lower doses of these drugs in the conscious SHR.
- 公益社団法人 日本薬理学会の論文
著者
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Imai Shoichi
Department Of Phamacology Niigata University School Of Medicine
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Nakazawa Mikio
Departement Of Medical Technology School Of Health Sciences Faculty Of Medicine Niigata University
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Takeda Keisuke
Department Of Applied Chemistry Faculty Of Engineering Gunma University
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NAKAHARA Hajime
Department of Pharmacology, Faculty of Pharmaceutical Sciences, Kyoto University
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