斑马鱼
生物
细胞生物学
再生(生物学)
椎间盘
脊索
程序性细胞死亡
平衡
细胞生长
细胞
解剖
细胞凋亡
遗传学
胚胎发生
胚胎
基因
作者
Amey Rayrikar,Ganesh Wagh,Manas Kumar Santra,Chinmoy Patra
出处
期刊:Development
[The Company of Biologists]
日期:2023-01-01
卷期号:150 (1)
摘要
ABSTRACT Intervertebral disc (IVD) degeneration is the primary cause of back pain in humans. However, the cellular and molecular pathogenesis of IVD degeneration is poorly understood. This study shows that zebrafish IVDs possess distinct and non-overlapping zones of cell proliferation and cell death. We find that, in zebrafish, cellular communication network factor 2a (ccn2a) is expressed in notochord and IVDs. Although IVD development appears normal in ccn2a mutants, the adult mutant IVDs exhibit decreased cell proliferation and increased cell death leading to IVD degeneration. Moreover, Ccn2a overexpression promotes regeneration through accelerating cell proliferation and suppressing cell death in wild-type aged IVDs. Mechanistically, Ccn2a maintains IVD homeostasis and promotes IVD regeneration by enhancing outer annulus fibrosus cell proliferation and suppressing nucleus pulposus cell death through augmenting FGFR1-SHH signaling. These findings reveal that Ccn2a plays a central role in IVD homeostasis and regeneration, which could be exploited for therapeutic intervention in degenerated human discs.
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