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Inhibition of the Notch Pathway Promotes Flap Survival by Inducing Functional Neoangiogenesis
Ozan Luay Abbas1, Hüseyin Borman, Yunus K Terzi
1From the *Department of Plastic and Reconstructive Surgery, Ahi Evran University, Kirsehir, Turkey; and Departments of †Plastic and Reconstructive Surgery, ‡Medical Genetics, §Pathology, ∥Biochemistry, and ¶Biostatistics, Baskent University, Ankara, Turkey.
Annals of Plastic Surgery
|September 3, 2014
Summary
Notch inhibition enhances blood vessel formation and flap survival following ischemia. Blocking the Notch pathway promotes reparative angiogenesis, leading to increased vascular density and improved tissue healing.
Area of Science:
- Vascular biology and regenerative medicine
- Molecular signaling pathways in angiogenesis
Background:
- The Notch pathway is a known regulator of angiogenesis, primarily acting as an anti-angiogenic factor in embryonic and tumor vasculature.
- Its role in ischemia-induced reparative angiogenesis remains less understood.
- This study investigates the Notch pathway's function in ischemia and the therapeutic potential of its inhibition.
Purpose of the Study:
- To elucidate the role of the Notch pathway in ischemia-induced angiogenesis.
- To evaluate the effects of Notch inhibition on angiogenic sprouting and flap survival.
Main Methods:
- Assessed Notch ligand delta-like ligand 4 (DLL4) and vascular endothelial growth factor (VEGF) expression in ischemic rat skin flaps.
- Utilized immunohistochemistry and plasma level measurements for DLL4 and VEGF.
- Administered a gamma-secretase inhibitor (GSI) to inhibit Notch signaling in ischemic flaps and assessed outcomes via microangiography, histology, and flap survival rates.
Main Results:
- Ischemia led to increased DLL4 and VEGF gene and protein expression in rat skin flaps.
- Notch inhibition with GSI significantly improved flap survival rates.
- GSI treatment resulted in increased microvascular structures and enhanced neovascularization in ischemic tissues.
Conclusions:
- The Notch pathway plays a critical role in regulating ischemia-induced angiogenesis.
- Inhibiting Notch signaling promotes flap survival by enhancing the formation of new blood vessels with increased vascular density.
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