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New ‘atherosclerosis atlas’ sheds light on heart attacks, strokes

December 12, 2023
in Health
New ‘atherosclerosis atlas’ sheds light on heart attacks, strokes
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New 'atherosclerosis atlas' sheds light on heart attacks, strokes

Graphical Abstract. Credit: Cell Reports (2023). DOI: 10.1016/j.celrep.2023.113380

University of Virginia School of Medicine researchers have created an “atlas of atherosclerosis” that reveals, at the level of individual cells, critical processes responsible for forming the harmful plaque buildup that causes heart attacks, strokes, and coronary artery disease.

Atherosclerosis, or hardening of the arteries, affects half of Americans between ages 45 and 84, and many don’t even know it, the National Institutes of Health reports. Over time, fatty plaques build up inside the arteries, where they can slow blood flow. When they break loose, they can be deadly, triggering strokes and heart attacks.

Doctors and scientists have been eager to better understand the complex factors that influence the formation and stability of the plaques, and UVA’s new work offers unprecedented insights that will facilitate the development of new ways to treat atherosclerosis, battle coronary artery disease (CAD), and help prevent plaque formation.

“To begin to develop effective treatments targeting specific disease processes in the vessel wall, we need to characterize gene expression programs at single-cell resolution,” said researcher Clint L. Miller, Ph.D., of the University of Virginia School of Medicine’s Center for Public Health Genomics, as well as its Departments of Biochemistry and Molecular Genetics and Public Health Sciences.

“By establishing this map, we can inform strategies to reprogram dysregulated cell states in order to prevent or reverse the disease or identify biomarkers to assess a patient’s risk of having clinical events.”

Understanding atherosclerosis

The formation of atherosclerotic plaques involves multiple types of cells, including immune cells, smooth muscle cells, and endothelial cells that line the arteries. Many of these cells transition into other types of cells during plaque formation, making it a huge challenge for scientists to determine the composition and origin of the plaque itself.

Miller and his collaborators, led by graduate student Jose Verdezoto Mosquera, have built a “comprehensive single-cell map of human atherosclerosis” encompassing almost 120,000 cells from atherosclerotic coronary and carotid arteries. In addition to charting broad cell lineages, the researchers leveraged this resource to dissect more granular and rare cell subtypes within atherosclerotic plaques.

The study also reveals new insights on the changes smooth muscle cells go through during disease progression, some of which contribute to the “calcification,” or hardening, of the coronary arteries. This led to the finding that two genes, LTBP1 and CRTAC1, can serve as measures for the progression of atherosclerosis.

“Beyond characterizing cell diversity, integrating this newly built atherosclerosis single-cell reference with large-scale human genetic data was critical to start identifying disease-causing cell types and subtypes,” Mosquera said. “For example, we identified the contribution of smooth muscle cell subtypes, such as fibroblast-like and lipid-rich smooth muscle cells, as well as the genes associated with these phenotypes.”

The UVA researchers say their new atlas represents a “critical step” toward developing better, more targeted interventions to battle atherosclerosis and CAD, as well as identify candidate biomarkers to prevent heart attacks and strokes and improve patient outcomes.

“We plan to extend this single-cell atlas with future iterations to include additional datasets from defined disease stages and patients from diverse backgrounds,” Miller said. “By integrating the corpus of single-cell data generated in the scientific community, we can mitigate sampling bias and establish more robust candidate disease mechanisms and potential interventions.”

The researchers have published their findings in the journal Cell Reports.

More information:
Jose Verdezoto Mosquera et al, Integrative single-cell meta-analysis reveals disease-relevant vascular cell states and markers in human atherosclerosis, Cell Reports (2023). DOI: 10.1016/j.celrep.2023.113380

Citation:
New ‘atherosclerosis atlas’ sheds light on heart attacks, strokes (2023, December 12)
retrieved 12 December 2023
from https://medicalxpress.com/news/2023-12-atherosclerosis-atlas-heart.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Medical Xpress – https://medicalxpress.com/news/2023-12-atherosclerosis-atlas-heart.html

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