Abstract:
STUDY DESIGN:Laboratory study. OBJECTIVE:Evaluate the effect of substance P (SP) on an intervertebral disc rat organ culture model. SUMMARY OF BACKGROUND DATA:Monolayer cell experiments have demonstrated that exposure intervertebral disc tissue cells to SP leads to upregulation in inflammatory cytokine expression; however, this has not been evaluated in a more complex organ culture model. METHODS:Forty-eight intervertebral discs from eight rats were used in an organ culture model. Intervertebral discs were divided into three groups: control, SP-treated group, and a group treated with an SP antagonist followed by SP. Cytokine antibody array was used to quantify expression patterns, which were confirmed using ELISA and real-time polymerase chain reaction. RESULTS:The cytokine array demonstrated a 3.40 ± 0.59-fold increase in interleukin 6 (IL-6) expression in the SP group (P = 0.004), and the effect of SP was mitigated by the SP antagonist (P = 0.03). These results were verified as ELISA demonstrated a significant difference in the IL-6 level between the control group and SP group (0.73 vs. 5.80 ng/mL, P < 0.001), and there was a significant difference in the IL-6 level between the SP and the SP antagonist group (5.80 vs. 4.02 ng/mL, P = 0.01). Similarly, the real-time polymerase chain reaction demonstrated that the discs treated with SP had a 4.77-fold increase in IL-6 levels (P = 0.01) compared to controls, and a significantly greater increase in IL-6 levels between the intervertebral discs in the SP group and those in the SP antagonist group versus control (4.77 vs. 1.57, P = 0.02). CONCLUSION:SP lead to the activation of an inflammatory pathway by increasing expression of IL-6 in an intervertebral disc organ culture model. These results provide evidence that SP may be an important factor in the link between intervertebral disc degeneration and low back pain. LEVEL OF EVIDENCE:N/A.
journal_name
Spine (Phila Pa 1976)journal_title
Spineauthors
Koerner JD,Markova DZ,Schroeder GD,Rihn JA,Hilibrand AS,Vaccaro AR,Anderson DG,Kepler CKdoi
10.1097/BRS.0000000000001676subject
Has Abstractpub_date
2016-12-15 00:00:00pages
1851-1859issue
24eissn
0362-2436issn
1528-1159pii
00007632-201612150-00002journal_volume
41pub_type
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