Local anaesthesia prevents acute inflammatory changes in neuropeptide messenger RNA expression in rat dorsal root ganglia neurons.
Sensory neuropeptides, synthesised in dorsal root ganglia (DRG), are implicated in neurogenic inflammation and nociception in arthritis. Adjuvant monoarthritis increases primary afferent activity and alters expression of neuropeptide genes in DRG. We investigated the role of neural discharge in the early changes in neuropeptide gene expression. Adjuvant injection increased preprotachykinin (PPT) and calcitonin gene-related peptide (CGRP) messenger RNA (mRNA) after 8 h, whereas somatostatin mRNA expression remained unchanged, in innervating L5 DRG neurons. The changes in PPT mRNA expression were prevented by concurrent local anesthesia of the sciatic nerve. Our results suggest that electrical activity mediates, in part, the changes in DRG gene expression in response to acute inflammation.
Department of Medicine, University of Edinburgh, Western General Hospital, UK.
L F
LF
Donaldson
D S
DS
McQueen
J R
JR
Seckl
D000772:Anesthesia, Local; D000818:Animals; D001169:Arthritis, Experimental / Q000378:metabolism*; D015740:Calcitonin Gene-Related Peptide / Q000096:biosynthesis; D005727:Ganglia, Spinal / Q000187:drug effects / Q000378:metabolism*; D015870:Gene Expression / Q000187:drug effects; D007249:Inflammation; D008012:Lidocaine / Q000494:pharmacology*; D008297:Male; D009407:Nerve Block; D009474:Neurons / Q000187:drug effects / Q000378:metabolism*; D009479:Neuropeptides / Q000096:biosynthesis*; D011498:Protein Precursors / Q000096:biosynthesis; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar; D013004:Somatostatin / Q000096:biosynthesis; D015320:Tachykinins / Q000096:biosynthesis
D009479:Neuropeptides; D011498:Protein Precursors; D012333:RNA, Messenger; D015320:Tachykinins; C044206:preprotachykinin; D013004:Somatostatin; D008012:Lidocaine; D015740:Calcitonin Gene-Related Peptide