S-palmitoylation in bone biology: emerging insights and therapeutic potential.

S-Palmitoylation, the reversible covalent attachment of palmitate to cysteine residues, is a dynamic post-translational lipid modification that regulates the localization, stability, and function of a wide array of proteins. Although traditionally linked to membrane trafficking and signaling, recent preliminary studies have begun to reveal its potential role in bone biology, underscoring its significant research value. This review highlights current advances in detection methodologies-particularly the use of 3H labeling and acyl-biotin exchange (ABE) techniques-that have enabled more precise mapping of the palmitoyl-proteome. We also provide a chronological overview of pivotal discoveries that have gradually shaped our understanding of palmitoylation beyond classical paradigms. Building on this foundation, we focus on emerging insights into how S-palmitoylation influences osteoblast and osteoclast differentiation, thereby contributing to skeletal homeostasis. Special attention is given to the interplay between lipid metabolism and palmitoylation machinery in bone cells, suggesting that this modification may serve as a nutrient-sensitive regulatory node during bone remodeling. Finally, we explore the therapeutic potential of targeting palmitoylation pathways-through enzymatic inhibition, metabolic modulation, genetic approaches, and epigenetic regulation-as promising strategies to enhance bone regeneration and treat conditions such as osteoporosis and fracture nonunion.