Baylor Researchers Uncover Natural DNA Repair Mechanism That Shields Arteries From Advanced Atherosclerosis Development

Baylor researchers discover how purine synthesis protects blood vessels from DNA damage. Learn why this find may impact heart health and cancer drug safety.

By: AXL Media

Published: Apr 28, 2026, 9:16 AM EDT

Source: Information for this report was sourced from EurekAlert!

The Discovery of an Active Defense in Vascular Linings

Scientists have identified a previously unknown biological process that allows blood vessels to actively resist the buildup of fatty deposits known as atherosclerosis. While conventional medicine has focused primarily on lowering cholesterol, this new research highlights the critical role of endothelial cells, the thin layer of cells lining the interior of arteries. Rather than acting as passive conduits, these cells engage in complex metabolic reprogramming to combat structural injury. According to Dr. Yuqing Huo of Baylor College of Medicine, this discovery addresses non-fat drivers of vascular damage that contribute to heart attacks and strokes even when cholesterol levels are managed.

Metabolic Adaptation Under Mechanical Stress

The study focused on how arteries respond to disturbed blood flow, a mechanical stressor that typically triggers DNA damage and genomic instability. Researchers found that when endothelial cells are exposed to these turbulent conditions, they stimulate specific genes responsible for creating purines, which are the fundamental building blocks of DNA. This metabolic shift is not a side effect of the damage but a targeted response aimed at fueling DNA repair mechanisms. By increasing purine production, the body attempts to preserve the endothelial barrier, preventing the vessel walls from becoming permeable to the harmful deposits that characterize advanced cardiovascular disease.

The Essential Role of Purine Synthesis Enzymes

To verify the importance of this pathway, the research team utilized animal models to observe the effects of removing a key enzyme known as Atic. This specific enzyme is a primary driver in the synthesis of new purines within the vascular system. The study revealed that deleting Atic led to widespread endothelial cell death and a total breakdown of the arterial barrier, which significantly accelerated the progression of atherosclerosis. According to Dr. Qian Ma, a postdoctoral associate at Baylor, supplementing the system with purines was able to reverse these negative effects, confirming that the availability of these compounds is a deciding factor in arterial health.