Role of Pink1 in Regulating Osteoclast Differentiation during Periodontitis.

This article investigates the role of PTEN-induced kinase 1 (PINK1) in regulating osteoclast differentiation and alveolar bone resorption during periodontitis, an inflammatory disease characterized by oxidative stress and mitochondrial dysfunction. The study found that PINK1 expression is significantly downregulated in periodontitis-affected tissues and osteoclasts, correlating with increased osteoclastogenesis and alveolar bone loss in both human samples and mouse models. Mechanistically, PINK1 deficiency impairs mitophagy, disrupts mitochondrial function, and enhances mitochondria-associated endoplasmic reticulum membrane (MAM)-mediated calcium transport, activating the calcineurin-NFATc1 signaling pathway that promotes osteoclast differentiation and bone resorption. These findings suggest that PINK1 modulates osteoclast activity through mitochondrial calcium regulation and highlight PINK1 and MAMs as potential therapeutic targets for periodontitis and related bone resorption disorders.