Document Detail

An anatomical and immunohistochemical characterization of afferents innervating the C6-C7 facet joint after painful joint loading in the rat.
MedLine Citation:
PMID:  23324931     Owner:  NLM     Status:  MEDLINE    
STUDY DESIGN: This study used retrograde neuronal tracing and immunohistochemistry to identify neurons innervating the C6-C7 facet joint and those expressing calcitonin gene-related peptide (CGRP) in the dorsal root ganglion (DRG) of rats after painful cervical facet joint injury.
OBJECTIVE: The objective of this study was to characterize the innervation of the C6-C7 facet joint after painful joint injury in the rat.
SUMMARY OF BACKGROUND DATA: The cervical facet joint is a source of neck pain, and its loading can initiate persistent pain. CGRP is a nociceptive neurotransmitter; peptidergic afferents have been identified in the facet joint's capsule. Although studies suggest that facet joint injury alters CGRP expression in joint afferents, the distribution of neurons innervating the C6-C7 facet joint and their expression of CGRP after a painful joint injury have not been investigated.
METHODS: Holtzman rats (Harlan Sprague-Dawley, Indianapolis, IN) received an intra-articular injection of cholera toxin subunit B in the C6-C7 facet joints. After injection, subgroups underwent either a painful joint distraction or sham procedure. Mechanical sensitivity was assessed, and immunohistochemical techniques were used to quantify CGRP expression and cholera toxin subunit B labeling in the C5-C8 DRGs.
RESULTS: Facet joint distraction-induced (P ≤ 0.0002) hypersensitivity. Neurons labeled by the joint injection were identified in the C5-C8 DRGs. Significantly, more (P ≤ 0.0001) cholera toxin subunit B-positive neurons were identified in the C7 DRG than any other level. At C7, 54.4% ± 15.3% of those neurons were also CGRP-positive, whereas only 41.5% ± 5.4% of all neurons were CGRP-positive; this difference was significant (P = 0.0084).
CONCLUSION: The greatest number of afferents from the C6-C7 facet joint has cell bodies in the C7 DRG, implicating this level as the most relevant for pain from this joint. In addition, peptidergic afferents seem to have an important role in facet joint-mediated pain.
Jeffrey V Kras; Kosuke Tanaka; Taylor M Gilliland; Beth A Winkelstein
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Spine     Volume:  38     ISSN:  1528-1159     ISO Abbreviation:  Spine     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-03-15     Completed Date:  2013-09-06     Revised Date:  2014-03-26    
Medline Journal Info:
Nlm Unique ID:  7610646     Medline TA:  Spine (Phila Pa 1976)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  E325-31     Citation Subset:  IM    
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MeSH Terms
Calcitonin Gene-Related Peptide / metabolism*
Cervical Vertebrae / injuries,  innervation*,  surgery
Ganglia, Spinal / metabolism,  pathology,  physiopathology
Hyperalgesia / etiology,  physiopathology
Microscopy, Fluorescence
Microscopy, Video
Neurons, Afferent / metabolism*
Osteogenesis, Distraction / adverse effects
Pain / etiology,  physiopathology
Rats, Sprague-Dawley
Zygapophyseal Joint / injuries,  innervation*,  surgery
Grant Support
Reg. No./Substance:
83652-28-2/Calcitonin Gene-Related Peptide

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

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