Updated Review of Cardiac Troponin Biology Reframes Myocardial Injury and Infarction Definitions
This review synthesizes the latest evidence on troponin complex structure, release kinetics, and elimination pathways, informed by insights from increasingly sensitive assays. It details mechanisms beyond necrosis · including reversible membrane blebbing, apoptosis, and proteolytic degradation · that explain low-level troponin release in non-infarction settings. The authors use this updated biological framework to critically evaluate the fourth universal definition of myocardial infarction and injury.
The original study
Clinical impact of current evidence on cardiac troponin structure, function and release mechanisms - An up to date review.
- Authors
- Hatherley J, Collinson P, Shantsila E, Gaze D, Khand A
- Journal
- Annals of clinical biochemistry
- Type
- Journal Article, Review
- PMID
- 40877034
Original abstract
Myocardial infarction remains a significant cause of mortality globally. High-sensitivity cardiac troponin is an essential criterion in the fourth universal definition of myocardial infarction. Our understanding of the structure and release mechanisms of troponin has been updated over the last decade, facilitated by ever more sensitive assays. This review initially outlines the structure and function of the troponin complex, then details the currently proposed mechanisms of release and elimination of troponin. It concludes by using this updated understanding to critique the current universal definition of myocardial infarction and injury.