Myocardial cell mitochondria and intracellular components

Myocardial cell mitochondria and intracellular components represent the collective metabolic and structural machinery within cardiomyocytes, primarily responsible for sustaining the heart's high energy demands (Brown et al., 2017, Nature Reviews Cardiology). Mitochondria occupy approximately 30% of the cardiomyocyte volume and are the site of oxidative phosphorylation, producing the ATP required for excitation-contraction coupling (Murphy et al., 2016, Circulation Research). Intracellular components also include the sarcoplasmic reticulum, which manages calcium flux, and the contractile apparatus or myofibrils. In cardiovascular diseases like heart failure and ischemia-reperfusion injury, mitochondrial dysfunction leads to ATP depletion, oxidative stress, and the opening of the mitochondrial permeability transition pore (mPTP), which triggers cell death (Hausenloy & Yellon, 2013, Journal of Clinical Investigation). Drugs like elamipretide target mitochondrial cardiolipin to improve bioenergetics, while others like cyclosporine have been investigated to inhibit the mPTP (Sabbah, 2016, JACC: Heart Failure). Because this entry describes a collection of organelles rather than a single protein or receptor, it is considered a cellular compartment target rather than a specific molecular target.

Other names

Cardiomyocyte mitochondriaCardiac mitochondriaIntracellular organelles of the myocardiumCardiac mitochondrial networkMyocardial bioenergetic apparatus

Inhibition of the mitochondrial permeability transition pore (mPTP) opening; stabilization of mitochondrial inner membrane cardiolipin to enhance electron transport chain efficiency; modulation of the sarcoplasmic reticulum calcium ATPase (SERCA) for improved calcium handling; reduction of mitochondrial oxidative stress through targeted antioxidants.