AJP - Heart Calcium Transients and Cell-Sarcomere
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Am J Physiol Heart Circ Physiol 257: H1543-H1550, 1989;
0363-6135/89 $5.00
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AJP - Heart and Circulatory Physiology, Vol 257, Issue 5 1543-H1550, Copyright © 1989 by American Physiological Society

ARTICLES

Effects of intracardiac bradykinin and capsaicin on spinal and spinoreticular neurons

D. C. Bolser, M. J. Chandler, D. W. Garrison and R. D. Foreman
Department of Physiology and Biophysics, University of Oklahoma Health Sciences Center, Oklahoma City 73190.

The responses of thoracic spinal and spinoreticular tract (SRT) neurons to activation of cardiac spinal afferents by injections of bradykinin (BK) and capsaicin (CAP) into the left atrium or pericardial sac were determined in vagotomized cats anesthetized with alpha-chloralose. Activities of spinal and SRT neurons in the T1-T5 spinal cord were recorded extracellularly. All neurons received excitatory somatic and cardiopulmonary sympathetic afferent input. Application of BK and CAP to the heart excited most SRT neurons and many spinal neurons but also inhibited some spinal neurons. The two drugs often affected spinal but not SRT neurons differently. Capsaicin excited high threshold and high threshold inhibitory neurons but not wide-dynamic range spinal neurons. In contrast, BK excited all three categories of spinal and SRT neurons. The differential responses of spinal neurons to intracardiac BK and CAP suggested that these compounds can stimulate functionally different populations of cardiac sympathetic afferents.


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