Document Detail

Myocardial ischemia induces the release of substance P from cardiac afferent neurons in rat thoracic spinal cord.
MedLine Citation:
PMID:  14684370     Owner:  NLM     Status:  MEDLINE    
Antibody-coated microprobes were inserted into the thoracic (T3-4) spinal cord in urethane-anesthetized Sprague-Dawley rats to detect the differences in the release of immunoreactive substance P-like (irSP) substances in response to differential activation of cardiac nociceptive sensory neurons (CNAN). CNAN were stimulated either by intrapericardial infusion of an inflammatory ischemic exudate solution (IES) containing algogenic substances (i.e., 10 mM each of adenosine, bradykinin, prostaglandin E2, and 5-hydroxytryptamine), or by transient occlusion of the left anterior descending coronary artery (CoAO). There was widespread basal release of irSP from the thoracic spinal cord. Stimulation of the CNAN by IES did not alter the pattern of release of irSP. Conversely, CoAO augmented the release of irSP from T3-4 spinal segments from laminae I-VII. This CoAO-induced irSP release was eliminated after thoracic dorsal rhizotomy. These results indicate that heterogeneous activation of cardiac afferents, as with focal coronary artery occlusion, represents an optimum input for activation of the cardiac neuronal hierarchy and for the resultant perception of angina. Excessive stimulation of cardiac nociceptive afferent neurons elicited during regional coronary artery occlusion involves the release of SP in the thoracic spinal cord and suggests that local spinal cord release of SP may be involved in the neural signaling of angina.
Fang Hua; Brian A Ricketts; Angela Reifsteck; Jeffrey L Ardell; Carole A Williams
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-12-18
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  286     ISSN:  0363-6135     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-04-09     Completed Date:  2004-05-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H1654-64     Citation Subset:  IM    
Department of Physiology, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614-1708, USA.
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MeSH Terms
Coronary Disease / physiopathology
Exudates and Transudates / metabolism
Heart / innervation*
Myocardial Ischemia / metabolism*,  physiopathology
Neurons, Afferent / metabolism*
Nociceptors / physiopathology
Rats, Sprague-Dawley
Spinal Cord / metabolism*
Substance P / metabolism*
Thoracic Vertebrae
Reg. No./Substance:
33507-63-0/Substance P

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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