Impact of Diabetic Condition on the Remodeling of In Situ Tissue-Engineered Heart Valves.

Most in situ tissue-engineered heart valve (TEHV) evaluation studies are conducted in a healthy physical environment, which cannot accurately reflect the specific characteristics of patients. In this study, we established a diabetic rabbit model and implanted decellularized extracellular matrix (dECM) into the abdominal aorta of rabbits through interventional surgery with a follow-up period of 8 weeks. The results indicated that dECM implants in diabetic rabbits exhibited poorer endothelialization and more severe fibrosis compared to those in healthy animals. Furthermore, mechanistic studies revealed that high glucose induced endothelial cell (EC) apoptosis and impeded their proliferation and migration, accompanied by an increase in reactive oxygen species (ROS) concentration and a decrease in the nitric oxide (NO) level. High glucose also led to elevated ROS levels and an increased expression of inflammatory factors and transforming growth factor β1 (TGF-β1) in macrophages, contributing to fibrosis. These findings suggest that oxidative-stress-mediated mechanisms are likely the primary pathways affecting heart valve repair and regeneration under diabetic conditions. Therefore, future design and evaluation of TEHVs may concern more patient-specific circumstances.