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Updated: Aug 13, 2026
Digital PCR for Quantifying Circulating MicroRNAs in Acute Myocardial Infarction and Cardiovascular Disease
Published on: July 3, 2018
Circulating exosomal miRNA in acute coronary syndrome: mechanisms, clinical relevance and future directions
P V Varshini1, Debarati Halder1, Tridip Mitra1
1Division of Medical Research, Faculty of Medicine and Health Sciences, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu, India.
Insights
Exosomal microRNAs (ExomiRs) show promise for early Acute Coronary Syndrome (ACS) diagnosis, potentially detecting cardiac injury before troponin elevation. These biomarkers may improve diagnostic accuracy and offer future therapeutic strategies.
Area of Science:
- Cardiovascular Medicine
- Biomarker Discovery
- Molecular Biology
Background:
- Acute Coronary Syndrome (ACS) is a major global health concern with ongoing diagnostic challenges.
- High-sensitivity cardiac troponins have improved ACS detection but have limitations in specificity and timing.
- Exosomal microRNAs (ExomiRs) are emerging as promising minimally invasive biomarkers for cardiovascular diseases.
Purpose of the Study:
- To explore the potential of ExomiRs as early diagnostic and prognostic biomarkers for Acute Coronary Syndrome (ACS).
- To evaluate the role of ExomiRs in cellular communication and their involvement in cardiac injury and remodeling processes.
- To discuss the therapeutic implications and clinical translation challenges of ExomiR-based strategies for ACS.
Main Methods:
- Review of current literature on ACS diagnosis, cardiac troponins, and exosomal microRNAs.
- Analysis of ExomiR release mechanisms during ischemic injury and their involvement in cardiac pathophysiology.
- Evaluation of ExomiR signatures for prognosis, subtype discrimination, and early ACS detection.
Main Results:
- ExomiRs are released early during cardiac ischemia, potentially preceding troponin elevation.
- Specific ExomiR signatures are associated with different roles in ACS prognosis and subtype classification.
- ExomiRs are implicated in inflammatory responses, apoptosis, angiogenesis, fibrosis, and ventricular remodeling post-injury.
Conclusions:
- ExomiRs represent a promising avenue for improving the sensitivity, specificity, and accuracy of ACS diagnosis.
- Further research and standardized protocols are needed for the clinical adoption of ExomiRs as reliable ACS biomarkers.
- ExomiR modulation holds potential for future therapeutic interventions in ACS management.
Abstract:
Despite significant advances in diagnosis and treatment, Acute Coronary Syndrome (ACS) remains one of the leading causes of morbidity and mortality globally. It comprises ST-elevation myocardial infarction, non-ST-elevation myocardial infarction, and unstable angina, caused by complex mechanisms such as plaque rupture, thrombosis, erosion, and microvascular dysfunction. The development of high-sensitivity cardiac troponins has greatly improved the early detection of ACS. However, concerns remain about specificity, timing, and prognostic accuracy. Exosomal miRNAs (ExomiRs) show promise as minimally invasive biomarkers, aiding precise cell communication and protecting encapsulated miRNAs from degradation. During ischemic injury, ExomiRs released from cardiomyocytes act early, often before troponin elevation, and are involved in processes such as inflammation, apoptosis, angiogenesis, fibrosis, and ventricular remodelling. Specific ExomiR signatures have different roles in prognosis, subtype discrimination, and early ACS diagnosis. Future therapeutic potential may include advancements in translational strategies, such as antagomir-based miRNA modulation. Furthermore, the clinical adoption of these biomarkers, despite challenges such as pre-analytical variability, differences across study cohorts, a lack of standardised isolation protocols, and the need for large-scale validation, will significantly improve the sensitivity, specificity, and accuracy of predicting ACS.
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