Notch3 establishes brain vascular integrity by regulating pericyte number

Area of Science:

• Neuroscience
• Developmental Biology
• Vascular Biology

Background:

• Brain pericytes regulate vascular integrity, blood flow, and permeability.
• Pericyte deficiencies are linked to neonatal intracranial hemorrhage, stroke, and neurodegeneration.
• Mechanisms of pericyte development and density regulation remain poorly understood, with Notch signaling implicated but not fully defined.

Purpose of the Study:

• To investigate the role of the Notch3 receptor in brain pericyte development and function.
• To elucidate the mechanisms by which Notch signaling regulates brain pericyte populations.
• To establish the function of Notch3 in brain vascular development using a zebrafish model.

Main Methods:

• Utilized zebrafish as a model organism to study brain pericyte development.
• Examined Notch3 receptor expression in zebrafish brain pericytes.
• Conducted conditional loss- and gain-of-function experiments to assess Notch3 signaling's impact on pericyte proliferation and blood-brain barrier function.

Main Results:

• Zebrafish brain pericytes express Notch3.
• Notch3 mutant zebrafish exhibit a deficit in brain pericytes and impaired blood-brain barrier function.
• Notch3 signaling was found to positively regulate brain pericyte proliferation.

Conclusions:

• Notch3 signaling plays a significant role in brain vascular development.
• Notch3 signaling promotes the expansion of the brain pericyte population.
• This study identifies a novel function for Notch signaling in regulating brain pericyte numbers and maintaining vascular health.