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Osteoarthritis (OA) is a whole-joint disorder that interferes with the quality of life in older individuals. Here we report that ZDHHC11 is highly expressed in articular chondrocytes but is downregulated in the degenerated cartilage of aged mice and patients with OA. ZDHHC11 prevents chondrocyte senescence and promotes cartilage anabolism, culminating in an improved OA phenotype. The deletion of Zdhhc11 in mice (Zdhhc11fl/fl) exacerbates OA progression in a destabilized medial meniscus model. Specifically, we identify ZDHHC11 as a key palmitoyltransferase whose depletion leads to a GNB2-dependent E3 ubiquitin ligase-mediated proteasomal degradation of APOD. Mechanistically, ZDHHC11-mediated palmitoylation alleviates OA progression by deactivating the GATA4–P65 signaling pathway. We also propose an original lipid nanoparticle-based platform for Zdhhc11 mRNA delivery to rejuvenate impaired cartilage by specifically targeting chondrocytes in vivo. Collectively, ZDHHC11-dependent palmitoylation is essential for ameliorating OA, and the targeted delivery of ZDHHC11 may serve as a promising strategy for future OA treatment. Wang, He, Gong and colleagues identify an age-related decline in the palmitoyltransferase ZDHHC11 in chondrocytes that leads to senescence and the pathogenesis of osteoarthritis, highlighting the potential of targeted ZDHHC11 delivery as a therapeutic strategy for osteoarthritis.
Wang et al. (Tue,) studied this question.