The effect of high cervical spinal cord stimulation on the expression of SP, NK-1 and TRPV1 mRNAs during cardiac ischemia in rat.
Spinal cord stimulation (SCS) is used to reduce angina that accompanies cardiac ischemia, but little is known about the molecular mechanisms mediating this effect. We studied the expression of SP, neurokinin-1 (NK-1) receptor, and transient receptor potential vanilloid type 1 (TRPV1) mRNA in the rat spinal cord at thoracic 4 (T4), cervical 2 (C2) and caudal brain stem by RT-PCR during intermittent occlusion of the left anterior descending coronary artery (CoAO), during sustained SCS by itself at the C2 spinal segment, and during sustained SCS plus intermittent CoAO. Only SP mRNA was increased significantly in T4 and brainstem during CoAO, while SCS decreased the mRNA levels of SP, NK-1 and TRPV1 significantly in T4 and the brainstem. SCS attenuated the increase of SP and TRPV1 mRNA levels at T4 level induced by intermittent CoAO when the stimulation was applied prior to the initiation of the cardiac ischemia. These results support the role for SP as a putative neurotransmitter for the myocardial ischemia-sensitive afferent neuron signal to the spinal level. They suggest that modification of the ischemic cardiac nociceptive afferent signal by SCS involves a change in SP and TRPV1 expression.
Ding
Xiaohui
X
Department of Physiology, James H. Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614-1708, United States.
Mountain
Deidra J Hopkins
DJ
Subramanian
Venkateswaran
V
Singh
Krishna
K
Williams
Carole Ann
CA
D000818:Animals; D001933:Brain Stem / Q000378:metabolism; D004195:Disease Models, Animal; D004558:Electric Stimulation / Q000379:methods*; D005786:Gene Expression Regulation / Q000528:radiation effects*; D008297:Male; D017202:Myocardial Ischemia / Q000503:physiopathology* / Q000628:therapy; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D018040:Receptors, Neurokinin-1 / Q000235:genetics* / Q000378:metabolism; D013116:Spinal Cord / Q000378:metabolism / Q000528:radiation effects*; D013373:Substance P / Q000235:genetics* / Q000378:metabolism; D050916:TRPV Cation Channels / Q000235:genetics* / Q000378:metabolism
D012333:RNA, Messenger; D018040:Receptors, Neurokinin-1; D050916:TRPV Cation Channels; C493922:Trpv1 protein, rat; D013373:Substance P