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Abstract

Paradoxical resistance to adrenolytic agents of field-stimulated bladder base of rabbit.

B E Slack, J W Downie and A Elbadawi
Journal of Pharmacology and Experimental Therapeutics January 1982, 220 (1) 216-222;
B E Slack
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J W Downie
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A Elbadawi
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Abstract

Isolated circulatory or longitudinally oriented strips from anterior or posterior rabbit bladder base were tested for responsiveness to agonists and sensitivity of field stimulation-induced responses to antagonists. Results were compared to the regional distribution of adrenergic and cholinergic nerves determined histochemically. Greater norepinephrine-induced responses in posterior than in anterior strips reflect denser noradrenergic innervation in posterior base. Longitudinal strips responded better to carbachol than circular strips, but no orientation-related differences in cholinergic nerve density or muscle mass were noted. Field stimulation-induced contractions were largely resistant to phenoxybenzamine (0.03 microM) and guanethidine (100 microM) and slightly reduced by phentolamine (2.6 microM). Atropine (0.4 microM) reduced maximum responses by 25 to 75%. The resistance to guanethidine suggests that the ineffectiveness of phenoxybenzamine is not due solely to atypical post synaptic receptors. Inaccessibility of the synaptic cleft to guanethidine is unlikely because the vas deferens, which possesses close contacts, was sensitive to guanethidine. Neurotransmission in bladder base may be partially noradrenergic, noncholinergic in nature. A question arises concerning the functional significance of the noradrenergic nerves in bladder base.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 220, Issue 1
1 Jan 1982
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Abstract

Paradoxical resistance to adrenolytic agents of field-stimulated bladder base of rabbit.

B E Slack, J W Downie and A Elbadawi
Journal of Pharmacology and Experimental Therapeutics January 1, 1982, 220 (1) 216-222;

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Abstract

Paradoxical resistance to adrenolytic agents of field-stimulated bladder base of rabbit.

B E Slack, J W Downie and A Elbadawi
Journal of Pharmacology and Experimental Therapeutics January 1, 1982, 220 (1) 216-222;
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