The role of Notch signaling in diabetic endothelial progenitor cells dysfunction

Area of Science:

• Vascular Biology
• Endocrinology
• Cell Signaling

Background:

• Diabetes mellitus impairs endothelial progenitor cell (EPC) function, contributing to vasculogenic dysfunction.
• The Notch signaling pathway is implicated in various cellular processes, but its role in diabetic EPC dysfunction is not fully understood.

Purpose of the Study:

• To elucidate the role of the Notch signaling pathway in the vasculogenic dysfunction of diabetic EPCs.
• To investigate whether inhibiting the Notch pathway can restore the function of diabetic EPCs.

Main Methods:

• Diabetes was induced in mice using Streptozotocin.
• Notch pathway activity was modulated using γ-secretase inhibitors (GSI).
• Functional assessments included EPC colony-forming capacity, differentiation, circulating EPC counts, and migration assays. Gene expression of Notch pathway components and VEGF was analyzed via RT-qPCR.

Main Results:

• Diabetes significantly increased Notch pathway expression in bone marrow EPCs, correlating with reduced EPC colony formation, differentiation, circulating EPC numbers, and migration.
• VEGF expression was also decreased in diabetic EPCs.
• Inhibition of the Notch pathway with GSI successfully reversed these deficits, restoring EPC function and increasing EPC-CFU, differentiation, and circulating EPC numbers.

Conclusions:

• The Notch signaling pathway plays a critical role in mediating the functional impairment of EPCs in diabetes.
• Inhibition of the Notch pathway in vitro effectively rescues diabetic EPC dysfunction.
• Targeting the Notch pathway presents a promising therapeutic strategy for restoring vascular function in diabetic patients.