Integrin α8-Mediated Pericyte Morphogenesis Controls Blood-Brain Barrier Integrity

Area of Science:

• Neuroscience
• Cell Biology
• Vascular Biology

Background:

• Pericyte morphology is vital for brain-blood barrier (BBB) development and function.
• The precise mechanisms linking pericyte morphology to BBB integrity remain unclear.
• Integrin α8 (ITGA8) is expressed in mature pericytes and involved in vascular remodeling.

Purpose of the Study:

• To investigate the role of Integrin α8 (ITGA8) in regulating pericyte morphology and BBB integrity.
• To elucidate the molecular mechanisms by which ITGA8 influences pericyte function.
• To assess the therapeutic potential of ITGA8 in neurological disorders, particularly ischemic stroke.

Main Methods:

• Utilized ITGA8-deficient mice to study pericyte morphology and BBB integrity.
• Investigated the Rho-ROCK signaling pathway and TGF-β1 activation in relation to ITGA8.
• Employed an ischemic stroke model in mice.
• Used adeno-associated virus (AAV)-mediated ITGA8 overexpression in vivo.

Main Results:

• ITGA8 deficiency disrupted pericyte morphology, reduced vascular coverage, and compromised BBB integrity.
• ITGA8 regulates pericyte morphology via Rho-ROCK signaling and impacts BBB function through TGF-β1.
• ITGA8 deficiency exacerbated BBB permeability and worsened neurological recovery post-stroke.
• AAV-mediated ITGA8 overexpression restored pericyte morphology and improved neurological outcomes.

Conclusions:

• ITGA8 is a key regulator of pericyte morphology and function, essential for maintaining BBB integrity.
• Targeting ITGA8 offers a promising therapeutic strategy for BBB repair and enhancing neurovascular recovery.
• Understanding ITGA8's role provides insights into cytoskeletal organization and microvascular stability.