Zooming in on the genesis of atherosclerotic plaque microcalcifications
Jessica L Ruiz1, Sheldon Weinbaum2, Elena Aikawa1,3
1Center for Excellence in Vascular Biology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
Insights
Cardiovascular calcification predicts heart disease and death, but mechanisms are unclear. New research explores how microcalcifications destabilize plaques, focusing on mineral deposition and extracellular vesicle roles.
Area of Science:
- Cardiovascular Science
- Biomineralization
- Atherosclerosis Research
Background:
- Calcium burden is a key predictor of cardiovascular morbidity and mortality.
- The role of calcification in atherosclerotic plaque stability is under re-evaluation.
- Microcalcifications within fibrous caps induce plaque-destabilizing mechanical stress.
Purpose of the Study:
- To elucidate the mechanisms driving early-stage cardiovascular calcification and mineral deposition.
- To address knowledge gaps concerning the link between calcification morphology and cardiovascular outcomes.
- To review proposed mechanisms of extracellular vesicle-mediated mineral deposition in cardiovascular calcification.
Main Methods:
- Review of epidemiological evidence linking calcium burden to cardiovascular events.
- Analysis of recent studies on microcalcification formation and mechanical stress in atherosclerotic plaques.
- Synthesis of proposed mechanisms for extracellular vesicle-mediated biomineralization.
Main Results:
- Cardiovascular calcification is a significant risk factor for adverse cardiovascular outcomes.
- Microcalcifications, not stabilizing, contribute to plaque vulnerability.
- Extracellular vesicles are implicated in the process of cardiovascular mineral deposition.
Conclusions:
- Understanding the early mechanisms of cardiovascular calcification is crucial for predicting outcomes.
- The role of microcalcifications in plaque destabilization requires further investigation.
- Extracellular vesicle-mediated pathways are key areas for future research in cardiovascular calcification.
Abstract:
Epidemiological evidence conclusively demonstrates that calcium burden is a significant predictor of cardiovascular morbidity and mortality; however, the underlying mechanisms remain largely unknown. These observations have challenged the previously held notion that calcification serves to stabilize the atherosclerotic plaque. Recent studies have shown that microcalcifications that form within the fibrous cap of the plaques lead to the accrual of plaque-destabilizing mechanical stress. Given the association between calcification morphology and cardiovascular outcomes, it is important to understand the mechanisms leading to calcific mineral deposition and growth from the earliest stages. We highlight the open questions in the field of cardiovascular calcification and include a review of the proposed mechanisms involved in extracellular vesicle-mediated mineral deposition.
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