Lung Pericytes: Molecular Mechanisms, Signaling Pathways, and Roles in Pulmonary Diseases

Area of Science:

• Pulmonary vascular biology
• Cellular biology
• Molecular mechanisms

Background:

• Pericytes are mural cells vital for vascular homeostasis and repair in systemic circulation.
• Their role in lung vascular biology and disease pathogenesis is increasingly recognized but less understood.
• Growing evidence highlights lung pericyte involvement in vascular remodeling and inflammation.

Purpose of the Study:

• To comprehensively review current knowledge on lung pericyte function.
• To elucidate the molecular mechanisms governing lung pericyte biology.
• To explore the roles of lung pericytes in major pulmonary diseases.

Main Methods:

• Literature review synthesizing existing research on lung pericyte function.
• Focus on key signaling pathways (e.g., PDGF-BB/PDGFRβ, TGFβ, VEGF/VEGFR, Angiopoietin/Tie2, Notch, Wnt, S1P).
• Examination of downstream signaling cascades, including kinases, transcription factors, and mechanotransduction.

Main Results:

• Detailed analysis of signaling pathways controlling pericyte recruitment, proliferation, differentiation, and phenotypic plasticity.
• Identification of complex downstream signaling networks orchestrating pericyte behavior.
• Exploration of pericyte involvement in diverse pulmonary diseases.

Conclusions:

• Lung pericytes are active participants in pulmonary vascular remodeling and inflammatory responses.
• Understanding the molecular pathways governing lung pericyte function is critical for addressing pulmonary diseases.
• Further research into lung pericyte biology offers therapeutic potential for conditions like ALI/ARDS, fibrosis, PAH, lung cancer, and infections.