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- W3092278013 abstract "The loss of nucleus pulposus (NP) notochordal cells is one of the key initial hallmarks of age-related intervertebral disc degeneration. Although the transmembrane mechanoreceptor integrin α5β1 is important in the process of disc degeneration, the relationship between integrin α5β1 and notochordal cell disappearance remains unclear. The purpose of this study was to elucidate the role of integrin α5β1 in the homeostasis of notochordal cells using an ex-vivo dynamic loading culture system that we developed. Rat tail functional spinal units (n = 80 from 40 rats) were cultured under unloading or 1.3-MPa, 1.0-Hz dynamic compressive loading for 48 or 144 h with or without an integrin α5β1 inhibitor. Disc histomorphology, cell viability, apoptosis, senescence, and phenotypic expression were investigated. Consequently, histological degenerative disc changes with decreased cell viability and increased cell apoptosis and senescence were observed with an extended loading duration. Immunofluorescence revealed that the expression of notochordal cell markers, CD24 and brachyury, and chondrocyte markers, collagen type II and SRY-box 9, declined with loading. In particular, reduction in notochordal cell marker expression was more dramatic than that in chondrocyte marker expression. Apoptotic terminal deoxynucleotidyl transferase dUTP nick-end labeling positivity was also higher in brachyury-positive notochordal cells. Furthermore, all these changes were delayed by inhibiting integrin α5β1. Findings of our dynamic loading regimen with a relatively high pressure suggest reproducibility of the cellularity and phenotypic disappearance of NP notochordal cells during adolescence, the susceptibility of notochordal cells to mechanical stimuli partially through the integrin α5β1 pathway, and future potential treatment of integrin regulation for intervertebral disc disease." @default.
- W3092278013 created "2020-10-15" @default.
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- W3092278013 date "2020-10-22" @default.
- W3092278013 modified "2023-10-16" @default.
- W3092278013 title "Delayed notochordal cell disappearance through integrin α5β1 mechanotransduction during ex‐vivo dynamic loading‐induced intervertebral disc degeneration" @default.
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- W3092278013 doi "https://doi.org/10.1002/jor.24883" @default.
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