Alpha-lipoic acid stimulates telomerase in vascular smooth muscle

In human cells, shortened telomeres, the protective caps at the ends of chromosomes, are both a sign of aging and contribute to it. Scientists at Emory University School of Medicine have found that the dietary supplement alpha lipoic acid (ALA) can stimulate telomerase, the enzyme that lengthens telomeres, with positive effects in a mouse model of atherosclerosis.

The discovery highlights a potential avenue for the treatment for chronic diseases.

The results were published Thursday, August 20 in Cell Reports.

“Alpha-lipoic acid has an essential role in mitochondria, the energy-generating elements of the cell,” says senior author Wayne Alexander, MD, PhD, professor of medicine at Emory University School of Medicine. “It is widely available and has been called a ‘natural antioxidant’. Yet ALA’s effects in human clinical studies have been a mixed bag.”

ALA appears to exert its effects against atherosclerosis by spurring the smooth muscle cells that surround blood vessels to make PGC1 (peroxisome proliferator-activated receptor gamma co-activator 1)-alpha. PGC1-alpha was already well known to scientists as controlling several aspects of how skeletal muscles respond to exercise. While the Emory researchers did not directly assess the effects of exercise in their experiments, their findings provide molecular clues to how exercise might slow the effects of aging or chronic disease in some cell types.

“The effects of chronic diseases such as atherosclerosis and diabetes on blood vessels can be traced back to telomere shortening,” Alexander says. “This means that treatments that can restore healthy telomeres have great potential.”

“What’s new here is that we show that PGC1-alpha is regulating telomerase, and that has real beneficial effects on cellular stress in a mouse model of atherosclerosis,” says Shiqin Xiong, PhD, instructor in the division of cardiology and first author of the paper.

Xiong and Alexander used a model of atherosclerosis where mice lacked the ApoE cholesterol processing gene and were fed a high-fat diet. In this model, mice also lacking PGC1-alpha have more advanced plaques in their blood vessels, but only in older animals, the authors show.

Consistent with the poorer state of their blood vessels, aortic cells from PGC1-alpha-disrupted mice had shorter telomeres and reduced telomerase activity. Having shortened telomeres led the smooth muscle cells to display more oxidative stress and damage to the rest of their DNA.

The authors show that introducing PGC1-alpha back into vascular smooth muscle cells lacking that gene with a gene-therapy adenovirus could restore telomerase activity and lengthen the cells’ telomeres.

Telomerase is off in most healthy cell types and only becomes turned on when cells proliferate. Because telomerase is active in cancer cells and enables their continued growth, researchers have been concerned that stimulating telomerase in all cells might encourage cancer growth or have other adverse effects.