RGD Reference Report - Direct application of the tumor necrosis factor-alpha inhibitor, etanercept, into a punctured intervertebral disc decreases calcitonin gene-related peptide expression in rat dorsal root ganglion neurons. - Rat Genome Database

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Direct application of the tumor necrosis factor-alpha inhibitor, etanercept, into a punctured intervertebral disc decreases calcitonin gene-related peptide expression in rat dorsal root ganglion neurons.

Authors: Horii, M  Orita, S  Nagata, M  Takaso, M  Yamauchi, K  Yamashita, M  Inoue, G  Eguchi, Y  Ochiai, N  Kishida, S  Aoki, Y  Ishikawa, T  Arai, G  Miyagi, M  Kamoda, H  Kuniyoshi, K  Suzuki, M  Nakamura, J  Toyone, T  Takahashi, K  Ohtori, S 
Citation: Horii M, etal., Spine (Phila Pa 1976). 2011 Jan 15;36(2):E80-5.
RGD ID: 5131270
Pubmed: PMID:21057386   (View Abstract at PubMed)
DOI: DOI:10.1097/BRS.0b013e3181d4be3c   (Journal Full-text)

STUDY DESIGN: retrograde neurotracing and immunohistochemistry were used to investigate the effect of the tumor necrosis factor (TNF)-alpha inhibitor, etanercept, on calcitonin gene-related peptide (CGRP) expression in dorsal root ganglion (DRG) neurons innervating intervertebral discs in rats. OBJECTIVE: to clarify the action of a TNF-alpha inhibitor on a sensory neuropeptide in DRG neurons innervating intervertebral discs. SUMMARY OF BACKGROUND DATA: degeneration of lumbar intervertebral discs is a cause of low back pain. TNF-alpha in the intervertebral disc is a major contributor to discogenie pain. Effects of TNF-alpha inhibition on CGRP expression in DRG neurons were evaluated. METHODS: the neurotracer FluoroGold was applied to the surfaces of L4/5 discs to label their innervating DRG neurons (n = 30). Of 30 rats, 10 were in a nonpunctured disc sham surgery control group, whereas the other 20 were in experimental groups in which intervertebral discs were punctured with a 23-gauge needle. Etanercept or saline was applied into the punctured discs (n = 10 each treatment). After 14 days of surgery, DRGs from L1 to L6 were harvested, sectioned, and immunostained for CGRP. The proportion of FluoroGold-labeled CGRP-immunoreactive DRG neurons was evaluated in all groups. RESULTS: FluoroGold-labeled neurons innervating the L4/5 disc were distributed throughout L1-L6 DRGs in all groups. Of the FluoroGold-labeled neurons, the proportion of CGRP-immunoreactive neurons was 21% +/- 4% in the sham surgery control group, 32% +/- 7% in the puncture + saline group, and 23% +/- 4% in the puncture + etanercept group. The proportion of CGRP-immunoreactive neurons was significantly greater in the puncture + saline group compared with the sham control and puncture + etanercept groups (P < 0.01). CONCLUSION: in this model, CGRP was upregulated in DRG neurons innervating damaged discs. However, direct intradiscal application of etanercept immediately after disc puncture suppressed CGRP expression in DRG neurons innervating injured discs. This finding may further elucidate the mechanism for the effectiveness of etanercept in upregulation of neuropeptide in DRG neurons innervating intervertebral discs.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
Intervertebral Disc Displacement  IMP 5131270human protein in rat modelRGD 
Intervertebral Disc Displacement  ISOTNFRSF1B (Homo sapiens)5131270; 5131270human protein in rat modelRGD 

Objects Annotated

Genes (Rattus norvegicus)
Tnfrsf1b  (TNF receptor superfamily member 1B)

Genes (Mus musculus)
Tnfrsf1b  (tumor necrosis factor receptor superfamily, member 1b)

Genes (Homo sapiens)
TNFRSF1B  (TNF receptor superfamily member 1B)


Additional Information