Enhancing osteogenic differentiation of diabetic tendon stem/progenitor cells through hyperoxia: Unveiling ROS/HIF-1α...

Area of Science:

• Biomedical Engineering
• Cell Biology
• Diabetology

Background:

• Diabetic calcific tendinopathy causes pain, restricted mobility, and tendon rupture in diabetic patients.
• Tendon stem/progenitor cells (TSPCs) are linked to diabetic calcific tendinopathy, but underlying molecular mechanisms are not fully understood.

Purpose of the Study:

• To investigate the role of hyperoxia in diabetic tendons and its effect on TSPCs.
• To elucidate the molecular signaling pathways involved in hyperoxia-induced TSPCs osteogenic differentiation.

Main Methods:

• Analysis of oxygen levels in diabetic tendons.
• In vitro studies on TSPCs under hyperoxic conditions, assessing osteogenic differentiation and reactive oxygen species (ROS) levels.
• Investigating the role of hypoxia-inducible factor-1a (HIF-1a) and its regulation.
• Intervention with N-acetyl-L-cysteine (NAC) and HIF-1a overexpression.
• In vivo studies using a rat Achilles tendon calcification model.

Main Results:

• Diabetic tendons exhibit a hyperoxic environment.
• Hyperoxia promotes TSPCs osteogenic differentiation and increases ROS levels.
• Hyperoxia leads to decreased HIF-1a in TSPCs via the ubiquitin-proteasome system.
• Blocking the ROS/HIF-1a signaling axis inhibits TSPCs osteogenic differentiation.
• NAC intervention prevented hyperoxia-induced Achilles tendon calcification in rats.

Conclusions:

• Hyperoxia in diabetic tendons drives TSPCs osteogenic differentiation via the ROS/HIF-1a signaling axis.
• This pathway presents a novel therapeutic target for preventing and treating diabetic calcific tendinopathy.