Recent advances in understanding cardiac contractility in health and disease

Area of Science:

• Cardiology
• Molecular Physiology
• Biochemistry

Background:

• Cardiac contraction relies on intricate calcium (Ca) regulation.
• Dysregulation of Ca handling contributes to heart disease.
• Understanding these mechanisms is crucial for therapeutic development.

Purpose of the Study:

• To review emerging ideas and experimental findings in cardiac physiology and pathophysiology from 2015.
• To provide context on cardiac contraction and Ca regulation for non-specialists.
• To highlight current thinking on key signaling pathways affecting cardiac function.

Main Methods:

• Review of recently published articles from 2015.
• Synopsis of experimental findings and theoretical concepts.
• Explanation of fundamental cardiac contraction and Ca regulation.

Main Results:

• Emerging research explores Ca regulatory pathways modulated by Ca/calmodulin-dependent protein kinase II.
• Potential influences of nitric oxide-mediated nitrosylation on cardiac function are discussed.
• New findings link reactive oxygen species (ROS) to contraction and Ca regulation post-myocardial infarction, potentially involving mitochondrial Ca.
• Signaling pathways affecting late Na current, afterdepolarizations, and transverse tubule disturbances are examined.

Conclusions:

• Recent advances offer new perspectives on cardiac Ca regulation and its modulation by various signaling pathways.
• These findings have implications for understanding myocardial infarction pathophysiology and pro-arrhythmic mechanisms.
• Continued research into these pathways is essential for advancing cardiovascular medicine.