Interferon-γ blocks signalling through PDGFRβ in human brain pericytes.

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Neuroinflammation and blood-brain barrier (BBB) disruption are hallmarks of various brain disorders.
• The precise mechanisms linking inflammation to BBB breakdown remain unclear.
• Brain pericytes are crucial for BBB integrity and possess immune activity.

Purpose of the Study:

• To investigate how inflammation affects brain pericyte biology.
• To test the hypothesis that inflammation regulates the BBB by altering pericyte function.

Main Methods:

• Primary adult human brain pericytes were exposed to chronic interferon-gamma (IFNγ) for 4 days.
• Assessed effects on platelet-derived growth factor receptor-beta (PDGFRβ) expression, signaling, pericyte proliferation, and migration.
• Utilized qRT-PCR, immunocytochemistry, flow cytometry, and western blotting.

Main Results:

• Chronic IFNγ enhanced PDGF-BB-induced PDGFRβ phosphorylation, internalization, and degradation.
• IFNγ treatment inhibited PDGF-BB-mediated pericyte proliferation and migration.
• These changes highlight a significant impact on pericyte functional biology.

Conclusions:

• PDGFRβ is essential for pericyte function and BBB integrity.
• Inflammation-induced alterations in PDGFRβ signaling offer a mechanism for BBB leakage.
• Findings link chronic brain inflammation to BBB dysfunction in neurological diseases.