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Effects of several β1-selective blockers on the pressor response of the adrenalectomized, pithed rats to electrical stimulations of the spinal nerves. Yoshito Nakagawa 1,2 , Takahito Kimura 1,2 , Hajime Nakahara 1,2 , Wan-Pao Chin 1,2 , Shoichi Imai 1,2 1Department of Pharmacology, Niigata University School of Medicine 2Division of Pharmacy, Yamagata University Hospital pp.1173-1180
Published Date 1986/11/15
DOI https://doi.org/10.11477/mf.1404204956
  • Abstract
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Effects of several β-blockers on the peripheral sympa-thetic adrenergic nervous system were studied in adrena-lectomized, pithed rats under atropinized and curarized conditions using the rise of the diastolic blood pressure produced by electrical stimulation (ES) of the spinal nerves and by intra-arterially injected noradrenaline as measures. The pressor response to close-arterial injection of noradrenaline was not inhibited by the β-blockers except oxprenolol, suggesting that β-blockers used other than oxprenolol did not possess blocking effects of the postsynaptic α receptor.

The rise of the diastolic blood pressure induced by ES was definitely inhibited by all the β1-selective blockers used (atenolol, practolol and dl-metoprolol) and by oxprenolol (α non-selective β-blocker), but not by d-metoprolol. Propranolol (a non-selective β-blocker, 1, 3 mg/kg, i.v. ) did not produce such an inhibition. This may be due to the unmasking of α-receptor resulted from the inhibition of the β2-receptor on the vascular smooth muscle as mentioned by Hyman et al. Another non-selective β-blocker, oxprenolol produced an inhibi-tion of the pressor response. This discrepancy may be explained by an α-blocking effect as evidenced in the present study and as reported by Vila et al.

These findings indicate that the receptor subserving the facilitation of noradrenaline release from the sympa-thetic postganglionic nerve terminals may be of β1-type.


Copyright © 1986, Igaku-Shoin Ltd. All rights reserved.

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