Protein responsible for regulating blood vessel growth identified

Washington, May 30 (ANI): Researchers at the University of California, San Diego School of Medicine have identified a protein that is responsible for regulating blood vessel growth by mediating the efficient removal of cholesterol from the cells.

Unregulated development of blood vessels can feed the growth of tumors.

The study was led by Yury Miller, MD, PhD, associate professor of medicine at UC San Diego.

Cholesterol is a structural component of the cell and is indispensable for normal cellular function, although its excess often leads to abnormal proliferation, migration, inflammatory responses or cell death.

The researchers studied how the removal of cholesterol from endothelial cells (cells that line the blood vessels) impacts the development of new blood vessels, the process called angiogenesis.

According to Miller, removal of excess cholesterol from endothelial cells is essential for restraining excessive growth of blood vessels.

"Too much cholesterol increases the abundance of lipid rafts, areas in the plasma membrane where surface receptors initiate signaling events leading to angiogenesis," Miller said.

VEGFR2 is such a receptor, playing a central role in the development of blood vessels.

Research into the process of angiogenesis suggests that VEGF-induced signaling within endothelial cells is important to tumor growth.

In this study, the scientists show that apoA-I binding protein (AIBP) is secreted by surrounding tissues and facilitates cholesterol removal from endothelial cells. This process interferes with the VEGFR2 receptor function, in turn inhibiting angiogenesis.

The study is set to be published online in the journal Nature. (ANI)

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