TMU Study Finds Natural Compound May Restore Vascular Repair Under Diabetic Conditions

Summary

A research team from Taipei Medical University (TMU) has identified a bioactive compound that may help restore the function of vascular repair cells impaired under high blood sugar conditions. The study shows that 2-hydroxy hispolon (2HH) can reverse dysfunction in endothelial progenitor cells by reducing oxidative stress and activating key protective signalling pathways. Using cell-based experiments and a diabetic mouse model, the researchers demonstrated improved blood vessel formation and circulation in ischemic tissue. The findings suggest a potential therapeutic strategy for addressing vascular complications associated with diabetes.

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When High Glucose Disrupts Vascular Repair

Chronic hyperglycaemia is known to damage blood vessels and weaken the body’s ability to repair vascular injury. One important contributor to this process is the dysfunction of endothelial progenitor cells (EPCs)—circulating cells that help maintain vascular health by promoting new blood vessel formation and repairing damaged tissue.

In individuals with diabetes, excessive glucose levels increase reactive oxygen species (ROS) and reduce nitric oxide signalling, disrupting EPC activity. This impairment contributes to the development of complications such as poor wound healing, critical limb ischemia, and cardiovascular disease.

To better understand how these processes might be reversed, researchers at Taipei Medical University investigated the protective potential of 2-hydroxy hispolon, a derivative of the natural antioxidant compound hispolon.

Key Findings: Reversing Damage in Vascular Repair Cells

The study identified several mechanisms through which 2-hydroxy hispolon improves cellular function under high-glucose conditions.

• Restoring angiogenic activity
  Treatment with 2HH significantly improved endothelial progenitor cell proliferation, migration, and tube formation—three essential processes required for new blood vessel development.
• Reducing oxidative stress
  The compound lowered intracellular reactive oxygen species levels while restoring nitric oxide signalling, helping recover cellular pathways involved in vascular repair.
• Activating protective signalling pathways
  Further molecular analysis showed that the effects were mediated through activation of the AMPK/HO-1 pathway and the PI3K/Akt/eNOS pathway, both of which are known to regulate endothelial function and oxidative stress responses.

“High glucose not only damages blood vessels but also weakens the cells responsible for vascular repair,” said Ta-Jung Wang , an attending physician at Taipei Medical University-Shuang Ho Hospital.

Interestingly, the protective effect was particularly evident in endothelial progenitor cells, suggesting that these vascular repair cells may be especially responsive to the compound.

From Cell Studies to Animal Models

To evaluate these mechanisms, the TMU research team conducted a series of laboratory experiments using different vascular cell types exposed to high-glucose environments. The researchers assessed cell proliferation, migration ability, tube formation, nitric oxide production, and oxidative stress levels.

The study also included a diabetic mouse model of hindlimb ischemia. In these animals, treatment with 2-hydroxy hispolon increased circulating angiogenic cells, improved blood flow recovery, and enhanced capillary density in affected muscle tissue.

These findings indicate that restoring EPC function may help improve vascular repair capacity in diabetic conditions.

Implications for Diabetic Vascular Complications

Vascular complications remain one of the leading causes of morbidity in diabetes, often resulting from impaired blood vessel repair and regeneration. By identifying a compound capable of restoring endothelial progenitor cell function, this study provides new insights into the mechanisms underlying diabetic vascular damage.

“Our findings suggest that restoring endothelial progenitor cell function may open a new direction for addressing diabetic vascular complications,” said Ju-Chi Liu, vice superintendent of Taipei Medical University-Shuang Ho Hospital.

Although further studies are needed to evaluate potential clinical applications, the results highlight the importance of targeting oxidative stress and vascular repair pathways when developing therapies for diabetes-related complications.

The research was conducted by a team from Taipei Medical University and published in the journal British Journal of Pharmacology.

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Original Article: 2-Hydroxyl hispolon reverses high glucose-induced endothelial progenitor cell dysfunction through the PI3K/Akt/eNOS and AMPK/HO-1 pathways