UMD-led Study Could Lead to Lengthened Lives for Patients With Premature Aging Disease
Researchers Identify Protein That Could Improve Cardiovascular Health of Those With Progeria
UMD researchers found that adding a protein to cells that line blood vessels might be able to improve the cardiovascular health of people with the disease progeria, which causes accelerated aging and death from heart attack or stroke when those afflicted with the disease are teenagers. This confocal image shows a wild-type aorta stained with human lamin A and lamin C (shown in green), Ang2 (red) and the nucleus (blue).
Image courtesy of Sahar Vakili
A new University of Maryland-led discovery could spur the development of new and improved treatments for Hutchinson-Gilford progeria syndrome (HGPS), often simply called “progeria”—a rare genetic disorder with no known cure that causes accelerated aging in children.
Publishing in the journal Aging Cell on Friday in collaboration with researchers from the National Institutes of Health (NIH) and Duke University, the study identified a protein that could enhance the cardiovascular health of animals with a genetically engineered form of progeria, and say it could improve human therapies. Heart failure and stroke are the most common causes of death for people with HGPS, who typically have a life expectancy of between 6 and 20 years.
The new findings from the lab of cell biology and molecular genetics Professor Kan Cao are “highly promising,” according to the paper’s lead author, Sahar Vakili, a biological sciences Ph.D. student.
“This could pave the way for new treatments targeting cardiovascular complications in HGPS, which are currently a major cause of mortality in the affected children,” Vakili said. “Beyond progeria, insights gained from this research might also be applicable to other age-related diseases where endothelial dysfunction plays a role.”
In addition to Cao and Vakili, UMD co-authors included graduate student Elizabeth Izydore ’20, Leonhard Losert ’28 and Huijing Xue Ph.D. ’23.
Sometimes called the “Benjamin Button disease,” HGPS causes a variety of symptoms associated with aging, including skin wrinkling, joint stiffness and the loss of hair and body fat. The disease stems from a mutation in the LMNA gene, which produces a protein that helps to keep cells healthy.
To better understand how progeria causes cardiovascular complications, the research team looked at endothelial cells, which line the body’s vascular system—including the heart—and control substances moving in and out of the bloodstream. Endothelial cell malfunction can lead to conditions including cardiovascular disease, stroke, blood clots and atherosclerosis (buildup of plaque inside the arteries).
The researchers wanted to understand the signals sent by endothelial cells that ultimately lead to HGPS-related cardiovascular disease. For the first time, the team discovered that a key protein that regulates the formation of new blood vessels and the flow of substances through blood vessel walls—it’s known as Angiopoietin-2 (Ang2)—is significantly impaired in individuals with progeria, affecting the overall function of their endothelial cells.
But the researchers discovered they could use Ang2 to “rescue” endothelial cells, improving their health despite dysfunction stemming from HGPS. It enhanced the formation of blood vessels, normalized cell migration and even restored nitric oxide levels, which are crucial for a healthy vascular system.
“Ang2 treatment also improves endothelial cell signaling to vascular smooth muscle cells, suggesting it could be a potential therapy for vascular dysfunctions in HGPS,” Vakili said.
Current treatments for HGPS can help reduce the risk of fatal complications like heart attack and stroke, but they do not target the underlying disease. Cao explained that her lab’s research is unlikely to offer a definitive progeria cure, but it could buy patients more time by improving their health in other ways.
“While Ang2 only has receptors on the endothelial cells, it may have a broader beneficial impact on additional tissue types beyond cardiovascular systems, such as bone and fat tissues, since blood vessels are essential for our body to transport nutrients, oxygen and waste,” said Cao, who started studying progeria in 2005, just two years after the cause of progeria was discovered.
Cao plans to conduct a follow-up study in collaboration with a group at the NIH to explore different methods of administering Ang2 to animal models with progeria.
While the work is ongoing, Cao is confident that each new study will bring researchers closer to identifying a cure.
“Research-wise, we are pushing hard,” she said, “and I can see the light at the end of the tunnel.”
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