TMEM30A deficiency in endothelial cells impairs cell proliferation and angiogenesis

Area of Science:

• Cell Biology
• Molecular Biology
• Vascular Biology

Background:

• Phosphatidylserine (PS) asymmetry is vital for eukaryotic cell membranes, maintained by P4-ATPase proteins (PS flippases).
• TMEM30 proteins, specifically the β-subunit, are essential for P4-ATPase folding and transport.
• Loss of Tmem30a is linked to diseases, but its role in vascular development is unknown.

Purpose of the Study:

• To investigate the role of TMEM30A in retinal vascular development and angiogenesis.
• To elucidate the molecular mechanisms underlying TMEM30A's function in endothelial cells.

Main Methods:

• Knockdown of TMEM30A in primary human retinal endothelial cells.
• Endothelial cell-specific deletion of Tmem30a in mice.
• Analysis of retinal vascular morphology, endothelial cell proliferation, and VEGF signaling.

Main Results:

• TMEM30A knockdown reduced tube formation in retinal endothelial cells.
• Tmem30a deletion in mice resulted in retarded retinal vascular development, characterized by hyperpruning, blunted-end tip cells with fewer filopodia, and reduced tip cell numbers.
• Tmem30a deletion impaired vessel barrier integrity and inhibited VEGF-induced endothelial cell proliferation.

Conclusions:

• TMEM30A plays a critical role in retinal vascular angiogenesis and development.
• TMEM30A is essential for maintaining vascular integrity and proper endothelial cell function.
• TMEM30A represents a potential therapeutic target for angiogenesis-related disorders.