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Am J Physiol Regul Integr Comp Physiol 268: R1188-R1195, 1995;
0363-6119/95 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 268, Issue 5 1188-R1195, Copyright © 1995 by American Physiological Society

ARTICLES

Low-frequency subthreshold sympathetic stimulation augments maximal reflex parasympathetic salivary secretion in cats

H. Izumi and K. Karita
Department of Physiology, Tohoku University School of Dentistry, Sendai, Japan.

Electrical stimulation of the peripheral cut end of the cervical sympathetic trunk for 3 min at frequencies < 1 Hz with pulses of 2-ms duration at supramaximal intensities did not elicit any salivary secretion, but an increase of stimulus frequency over the range 2-10 Hz produced progressively greater salivary secretion, the maximum volume of salivary secretion being evoked at 10 Hz. Frequency-dependent augmentation of parasympathetic reflex submandibular salivary secretion occurred when the lingual nerve was stimulated during repetitive sympathetic stimulation (at frequencies of 0.1-2 Hz) in our sympathectomized cats. The augmentation was found to be linearly related to sympathetic stimulus frequency (regression line calculated by method of least squares; r = 0.939, P < 0.01). This augmentation was abolished by prior treatment with the beta-adrenoceptor blocking drug propranolol (1 mg/kg, P < 0.01 vs. before propranolol) but not by the alpha-adrenoceptor blocking agent phentolamine (1 mg/kg), indicating that the augmented response was mediated via an activation of beta-adrenoceptors. The reduction of the augmentation caused by propranolol had diminished 1 h after its administration, showing that the effect was reversible.


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