Telomerase reverse transcriptase promotes angiogenesis in neonatal rats after hypoxic-ischemic brain damage

Area of Science:

• Neuroscience
• Regenerative Medicine
• Molecular Biology

Background:

• Angiogenesis is a natural repair process after hypoxic-ischemic brain damage (HIBD).
• Telomerase reverse transcriptase (TERT) is known to regulate angiogenesis.
• The role of TERT in HIBD-induced angiogenesis was investigated.

Purpose of the Study:

• To determine if TERT promotes angiogenesis after HIBD.
• To investigate TERT's effect on blood-brain barrier (BBB) integrity post-HIBD.
• To explore the involvement of the Notch-1 pathway in TERT-mediated angiogenesis.

Main Methods:

• Developed in vivo and in vitro HIBD models in neonatal rats.
• Overexpressed TERT using viral vectors and measured its levels via qPCR.
• Assessed brain microvascular endothelial cell proliferation, microvessel formation, and BBB integrity (ZO-1, Evans Blue).
• Measured Notch-1 expression using Western blotting.

Main Results:

• TERT overexpression enhanced brain microvascular endothelial cell proliferation and microvessel formation in HIBD models.
• TERT improved blood-brain barrier integrity after HIBD.
• TERT overexpression increased Notch-1 expression in response to oxygen-glucose deprivation.

Conclusions:

• TERT promotes angiogenesis and maintains BBB integrity following neonatal HIBD.
• The Notch-1 signaling pathway is implicated in TERT's angiogenic function.
• TERT represents a promising therapeutic target for hypoxic-ischemic encephalopathy.