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Updated: May 27, 2026

Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells

Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells

Published on: April 27, 2018

Studying mitochondrial Ca(2+) uptake - a revisit.

Claire Jean-Quartier¹, Alexander I Bondarenko, Muhammad Rizwan Alam

¹Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, A-8010 Graz, Austria.

Molecular and Cellular Endocrinology

|November 22, 2011

Summary

This summary is machine-generated.

Mitochondrial calcium uptake involves multiple pathways, not just one uniporter. Different cell types exhibit distinct calcium currents, highlighting the need for diverse methods to study mitochondrial calcium homeostasis.

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Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells

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Imaging Mitochondrial Ca2+ Uptake in Astrocytes and Neurons using Genetically Encoded Ca2+ Indicators (GECIs)

Imaging Mitochondrial Ca²⁺ Uptake in Astrocytes and Neurons using Genetically Encoded Ca²⁺ Indicators (GECIs)

Published on: January 22, 2022

Area of Science:

Cell Biology
Mitochondrial Physiology
Ion Transport

Background:

Mitochondrial calcium (Ca2+) sequestration is crucial for cellular functions and disease.
Previously, a single mitochondrial Ca2+ uniporter was thought to mediate all Ca2+ entry.
Emerging evidence suggests multiple, distinct Ca2+ carriers exist.

Purpose of the Study:

To compare various methods for studying mitochondrial Ca2+ uptake.
To investigate the diversity of mitochondrial Ca2+ transport pathways.
To understand cell-type specific differences in mitochondrial Ca2+ handling.

Main Methods:

Patch clamp electrophysiology on mitoplasts (endothelial and HeLa cells).
Measurement of mitochondrial Ca2+ signals using Rhod-2/AM, pericam, and cameleon.
Comparison of techniques using isolated organelles, permeabilized, and intact cells.

Main Results:

Patch clamp revealed distinct mitoplast Ca2+ currents (MCCs) with varying conductances (s-, i-, l-, xl-MCC).
Specific MCCs were cell-type dependent (e.g., s-MCC and l-/xl-MCC in endothelial vs. HeLa cells).
Different Ca2+ sensitivities were observed for distinct uptake routes, and homogeneous vs. heterogeneous mitochondrial Ca2+ signals were detected depending on the method.

Conclusions:

Mitochondrial Ca2+ uptake is mediated by versatile, cell-type specific pathways.
A single uniporter model is insufficient to explain mitochondrial Ca2+ transport.
Employing multiple technical approaches is essential for comprehensively studying mitochondrial Ca2+ homeostasis.