Integrin α6 upregulation in nucleus pulposus cell under high oxygen tension attenuates intervertebral disc degeneration
Xu, Z.; Zheng, J.; Zhang, Y.; Wu, H.; Sun, B.; Zhang, K.; Wang, J.; Zang, F.; Zhang, X.; Guo, L.; Wu, X.
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The destruction of low oxygen microenvironment played critical roles in the pathogenesis of intervertebral disk degeneration (IVDD). In this study, high oxygen tension (HOT) treatment upregulated integrin 6(ITG 6) expression, which could be alleviated by blocking PI3K/AKT signaling pathway. And the levels of ITG 6 expression were increased in the NP tissue from IVDD patients and IVDD rat model with mild degeneration, which were reduced as degeneration degree increases. Further studies found that ITG 6 could protect NP cells against HOT-induced apoptosis and oxidative stress, and protect NP cells from HOT-inhibited ECM proteins synthesis. ITG 6 upregulation by HOT contributed to maintain a NP tissue homeostasis through the interaction with hypoxia inducible factor-1 (HIF-1). Furthermore, silencing of ITG 6 in vivo could obviously accelerate puncture-induced IVDD. Taken together, ITG 6 upregulation by HOT in NP cells might be a protective factor in IVDD as well as restore NP cell function.
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