Increased expression of matrix metalloproteinase-10, nerve growth factor and substance P in the painful degenerate intervertebral disc

IntroductionMatrix metalloproteinases (MMPs) are known to be involved in the degradation of the kernel pulposus (NP) during intervertebral cd (IVD) degeneration. This announce investigated MMP-10 (stromelysin-2) expression in the NP during IVD deterioration and correlated its locution with proinflammatory cytokines and molecules involved in innervation and nociception during degeneration which results in low back pain (LBP). Methods: Human NP tissue was obtained at post-mortem (PM) from patients without a story of back rack and graded as histologically standard or degenerate. Symptomatic degenerate NP samples were extremely obtained at surgery for LBP. Vocable of MMP-10 mRNA and protein was analyzed using real-time PCR and immunohistochemistry. Gene expression for proinflammatory cytokines IL-1 and TNF-alpha, nerve aggrandizement antecedent (NGF) and the pain-associated neuropeptide Substance P were also analysed. Correlations between MMP-10 and IL-1, TNF-alpha and NGF were assessed along with NGF with Substance P. Results: MMP-10 mRNA was significantly increased in surgical degenerate NP when compared to PM normal and PM degenerate samples. MMP-10 protein was too significantly higher in degenerate surgical NP samples compared to PM normal. IL-1 and MMP-10 mRNA demonstrated a meaning correlation in surgical degenerate samples, while TNF-alpha was not correlated with MMP-10 mRNA. NGF was significantly correlated with both MMP-10 and Substance P mRNA in surgical degenerate NP samples. Conclusions: MMP-10 expression is increased in the symptomatic degenerate IVD, where it may contribute to matrix degradation and initiation of nociception. Importantly, this study suggests differences in the pathways involved in matrix degradation between painful and pain-free IVD degeneration.

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