Cyasterone Improves Mitochondrial Function and Protects against Knee Osteoarthritis by Activating PPARγ

Area of Science:

• Mitochondrial Biology
• Osteoarthritis Research
• Pharmacology

Background:

• Mitochondrial dysfunction is implicated in knee osteoarthritis (OA) development.
• Cyasterone previously showed benefits in fracture healing by enhancing mesenchymal stem cell (MSC) activity.
• The therapeutic potential of cyasterone for OA remained unexplored.

Purpose of the Study:

• To investigate the effects of cyasterone on mitochondrial function in mouse chondrocytes.
• To evaluate the therapeutic impact of cyasterone on a mouse model of knee osteoarthritis.

Main Methods:

• Primary chondrocytes were isolated and treated with lipopolysaccharide (LPS) to model OA.
• Mitochondrial function markers (ATP, NAD+/NADH ratio, oxidative stress, membrane potential) were assessed.
• Mice with induced OA were treated with cyasterone, followed by histological and biochemical analysis of knee joints.

Main Results:

• Cyasterone treatment restored mitochondrial function in LPS-induced chondrocytes, increasing ATP production and NAD+/NADH ratio while reducing oxidative stress.
• Cyasterone significantly upregulated Peroxisome proliferator-activated receptor γ (PPARγ) expression.
• In vivo, cyasterone treatment improved cartilage histopathology, increased aggrecan and PPARγ expression, and decreased MMP13 and p65 phosphorylation in OA mice.

Conclusions:

• Cyasterone restores chondrocyte mitochondrial function and prevents OA progression, partly by upregulating PPARγ.
• The compound effectively reduces extracellular matrix degradation in an in vivo OA model.
• Cyasterone presents a promising natural therapeutic candidate for osteoarthritis treatment.