Overexpression of RAD54L attenuates osteoarthritis by suppressing the HIF-1α/VEGF signaling pathway: Bioinformatics...

Area of Science:

• Biomedical research
• Molecular biology
• Osteoarthritis research

Background:

• Osteoarthritis (OA) is a prevalent degenerative joint disease causing pain and disability.
• Current OA treatments are limited, necessitating the identification of novel therapeutic targets and biomarkers.
• Bioinformatics analysis identified DNA repair/recombination protein 54 L (RAD54L) as a potential factor in OA.

Purpose of the Study:

• To investigate the therapeutic potential of RAD54L in osteoarthritis.
• To determine the effect of RAD54L overexpression on human articular chondrocytes and in a rat model of OA.
• To elucidate the molecular mechanisms underlying RAD54L's action in OA, specifically its interaction with the HIF-1α/VEGF pathway.

Main Methods:

• RAD54L was overexpressed in interleukin-1β (IL-1β)-induced human chondrocytes and in OA rat models.
• Cell viability and apoptosis were assessed using Cell Counting Kit-8 and flow cytometry.
• OA severity was evaluated using Hematoxylin-eosin staining and Osteoarthritis Research Society International standards.
• Inflammatory mediators, HIF-1α, and VEGF expression were measured via ELISA and western blot.

Main Results:

• RAD54L overexpression enhanced chondrocyte viability and reduced apoptosis in vitro.
• In vivo, RAD54L overexpression led to lower Osteoarthritis Research Society International scores and reduced cartilage damage and inflammation in OA rats.
• RAD54L overexpression suppressed the expression of inflammatory mediators, HIF-1α, and VEGF, indicating inhibition of the HIF-1α/VEGF signaling pathway.

Conclusions:

• RAD54L overexpression demonstrates a protective effect against osteoarthritis in both cellular and animal models.
• RAD54L attenuates OA progression by suppressing the HIF-1α/VEGF signaling pathway.
• RAD54L represents a promising therapeutic target for osteoarthritis treatment.