Region-specific mitophagy in nucleus pulposus, annulus fibrosus, and cartilage endplate of intervertebral disc degeneration: mechanisms and therapeutic strategies - Feng, Chaoqun; Hu, Ziang; Zhao, Min; Leng, Chuan; Li, Guangye; Yang, Fei; Fan, Xiaohong (Frontiers in Pharmacology, 2025)