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Updated: Jan 15, 2026

Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents
Published on: July 3, 2013
Impaired Atrial Mitochondrial Calcium Handling in Patients With Atrial Fibrillation
Julius Ryan D Pronto1,2, Fleur E Mason1,2, Eva A Rog-Zielinska3
1Institute of Pharmacology and Toxicology (J.R.D.P., F.E.M., F.E.F., D.B., P.B., P.J.S., K.R., S.K., N.V.), University Medical Center Göttingen, Germany.
Mitochondrial calcium handling is impaired in atrial fibrillation (AF), linked to cellular disorganization. Enhancing mitochondrial calcium uptake may prevent arrhythmias in AF patients.
Area of Science:
- Cardiology
- Mitochondrial Biology
- Electrophysiology
Background:
- Mitochondrial calcium (Ca2+) regulates cardiac energetics.
- Atrial fibrillation (AF) reduces cytosolic Ca2+ but its mitochondrial effects are unknown.
Purpose of the Study:
- Investigate mitochondrial Ca2+ handling and redox state in AF.
- Explore ezetimibe's effect on AF-related proarrhythmic activity.
Main Methods:
- Isolated atrial myocytes subjected to workload changes.
- Measured Ca2+, NAD(P)H/FAD autofluorescence.
- Used advanced microscopy and ezetimibe treatment.
Main Results:
- Impaired mitochondrial Ca2+ accumulation and NAD(P)H/FAD regeneration in AF.
- Spatial disorganization of sarcoplasmic reticulum and mitochondria due to microtubule destabilization.
- Ezetimibe reduced arrhythmogenic events in myocytes and AF burden in patients.
Conclusions:
- Mitochondrial Ca2+ uptake is impaired in AF myocytes.
- Microtubule destabilization disrupts cardiac Ca2+ transfer.
- Enhancing mitochondrial Ca2+ uptake may offer protection against AF.
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