Abstract
Newborn rats were surgically sympathectomized by extirpation of the left superior cervical ganglion. After 9 weeks the parotid glands of both sides were used for secretory studies. Isoprenaline, dopamine, and the dibutyryl analogue of cAMP (DBcAMP) caused an increase in amylase release, which was significantly higher in the denervated glands. Also carbamylcholine was more effective in the denervated gland; the concentration-response curve was shifted to the left, and the maximal output of amylase was increased. Neonatal sympathetic denervation induces supersensitivity for both adrenergic and cholinergic agonists as well as for DBcAMP. This may be due to compensatory mechanisms involving both up-regulation of receptors as well as amplification of the intracellular mediation.
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