Mar 1, 1976

Possible involvement of a transmitter different from norepinephrine in the residual responses to nerve stimulation of the cat nictitating membrane after pretreatment with reserpine

The Journal of Pharmacology and Experimental Therapeutics
S Z Langer, J E Pinto

Abstract

Pretreatment with reserpine (0.3 or 3 mg/kg, 24 hours before the experiment) reduced the norepinephrine (NE) levels in the medial muscle of the cat nictitating membrane to approximately 2% of the control values. Under these experimental conditions, the responses to postganglionic nerve stimulation were not abolished, reaching up to 50% of the maximum development of tension to exogenous sympathomimetic amines both in vivo and in vitro. In contrast to the responses to nerve stimulation obtained in normal nictitating membranes, the residual responses to nerve stimulation obtained after pretreatment with reserpine were not blocked by phentolamine (3.1 and 31 muM) or by 0.29 muM phenoxybenzamine. The effectiveness of phentolamine and phenoxybenzamine in blocking responses to exogenous NE was the same when the normal nictitating membrane was compared to the smooth muscle obtained from cats pretreated with reserpine. The residual responses to nerve stimulation were reduced when the calcium concentration in the medium was decreased to 0.65 mM. These residual responses were abolished in the presence of tetrodotoxin. Scopolamine, 0.078 muM, did not reduce the residual responses to nerve stimulation while it antagonized the responses to e...Continue Reading

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Mentioned in this Paper

Calcium [EPC]
Adenosine
Calcium
Smooth Muscle
Tetrodotoxin
Norepinephrine, (+, -)-Isomer
Adrenergic alpha-Antagonists
Scopolamine
Amines, Sympathomimetic
Scoburen

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