ROS/TGF-β signal mediated accumulation of SOX4 in OA-FLS promotes cell senescence

Area of Science:

• Rheumatology and Cellular Biology
• Investigating molecular mechanisms in age-related joint diseases.

Background:

• Osteoarthritis (OA) is a prevalent age-related condition lacking specific treatments, often managed symptomatically.
• Fibroblast-like synoviocytes (FLS) are key players in joint inflammation and destruction during OA.
• Cellular senescence, characterized by cell-cycle arrest and a senescence-associated secretory phenotype (SASP), significantly contributes to OA pathogenesis.

Purpose of the Study:

• To investigate the role of SRY-related HMG-box 4 (SOX4) in OA pathogenesis by examining its effect on FLS senescence.
• To elucidate the underlying mechanisms by which SOX4 influences FLS senescence in OA.

Main Methods:

• Comparative analysis of cellular senescence in FLS from OA patients versus control subjects.
• Verification of the involvement of reactive oxygen species (ROS)/TGF-β signaling in inducing OA-FLS senescence.
• Assessment of SOX4 activation's impact on FLS senescence and SASP.
• Identification of SOX4 as a critical transcription factor regulated by ROS/TGF-β signaling in OA-FLS senescence.

Main Results:

• FLS from OA patients exhibited significantly higher levels of cellular senescence compared to controls.
• Reactive oxygen species (ROS)/TGF-β signaling pathways were confirmed to induce senescence in OA-FLS.
• SOX4 activation was found to promote cellular senescence and the SASP in OA-FLS.
• SOX4 was identified as a critical transcription factor, regulated by ROS/TGF-β signaling, that is associated with OA-FLS senescence.

Conclusions:

• SOX4 plays a crucial role in promoting fibroblast senescence and SASP in osteoarthritis.
• The ROS/TGF-β signaling pathway regulates SOX4, contributing to OA pathogenesis.
• SOX4 represents a potential novel therapeutic target and early diagnostic marker for osteoarthritis.