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Demonstration of beta-adrenergic receptors in rat bronchiolar epithelial cells employing 9-amino-acridyl propranolol fluorescent microscopy

GD Massaro and LD Davis

Prior work has provided ultrastructural evidence that beta-adrenergic agonists stimulate secretion by nonciliated bronchiolar epithelial (Clara) cells of the rat (J Clin Invest 67:345, 1981). However, since the lung is a multicellular organ it is not clear if the beta-agonists act directly on the Clara cell. The absence in Clara cells of beta- adrenergic receptors would indicate an indirect action of the beta- adrenergic agonists. In the present study, we used 9-amino-acridyl propranolol in an attempt to determine if beta-adrenergic receptors are present in rat bronchiolar Clara cells. Discrete, intense yellow fluorescent dots were identified microscopically in ciliated and in Clara cells of the rat. This anatomical localization of beta-adrenergic receptors supports the notion that beta-adrenergic agonists stimulate secretion by acting directly on Clara cells.

Volume 32, Issue 1, pp. 122-123, 01/01/1984
Copyright © 1984 by The Histochemical Society


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