The use of CalciumOrange-5N as a specific marker of mitochondrial Ca2+ in mouse skeletal muscle fibers

We report the use of the fluorescent dye CalciumOrange-5N (CaOr-5N) as a specific mitochondria Ca 2+ marker in enzymatically dissociated mouse FBD muscle fibers. Using laser scanning confocal microscopy and the dyes Mitotracker Green (MTG), di-8-ANEPPS and endoplasmic reticulum tracker green (ERTG),...

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Veröffentlicht in:Pflügers Archiv 2008-01, Vol.455 (4), p.721-731
Hauptverfasser: Bolaños, Pura, Guillen, Alis, Rojas, Héctor, Boncompagni, Simona, Caputo, Carlo
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Guillen, Alis
Rojas, Héctor
Boncompagni, Simona
Caputo, Carlo
description We report the use of the fluorescent dye CalciumOrange-5N (CaOr-5N) as a specific mitochondria Ca 2+ marker in enzymatically dissociated mouse FBD muscle fibers. Using laser scanning confocal microscopy and the dyes Mitotracker Green (MTG), di-8-ANEPPS and endoplasmic reticulum tracker green (ERTG), we determined the relative position of mitochondria, transverse tubules and sarcoplasmic reticulum in the sarcomere. Comparison with electron micrographies showed that mitochondria are mostly present at both sides of Z lines and near the triads located at the A-I band border. CaOr-5N fluorescence was mainly distributed in mitochondria, highly co-localised with MTG and basically excluded from the A band space. ERTG localised mostly between the two t-tubules present in each sarcomere. We studied the effect of the protonophore FCCP using CaOr-5N to measure mitochondrial Ca 2+ and JC-1 dye to measure mitochondria inner membrane potential (Δ Ψ m ). After FCCP treatment, the CaOr-5N fluorescence diminished by about 33% in 80 s, while JC-1 fluorescence diminished by 36% in 200 s. Our results show the loss of Ca 2+ from mitochondria when ΔΨ m is depolarised and demonstrate the usefulness of CaOr-5N to mark mitochondrial [Ca 2+ ] m .
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subjects Aldehydes
Animals
Benzimidazoles
Biomedical and Life Sciences
Biomedicine
Calcium
Calcium - metabolism
Carbocyanines
Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone - pharmacology
Cell Biology
Dyes
Fluorescent Dyes
Human Physiology
Membrane Potential, Mitochondrial - drug effects
Mice
Microscopy, Confocal
Mitochondria
Mitochondria, Muscle - metabolism
Mitochondria, Muscle - ultrastructure
Molecular Medicine
Muscle Fibers, Skeletal - metabolism
Muscle Fibers, Skeletal - ultrastructure
Muscle, Skeletal - metabolism
Muscle, Skeletal - ultrastructure
Muscular system
Neurosciences
Organic Chemicals
Proteins
Pyridinium Compounds
Receptors
Sarcomeres - metabolism
Sarcoplasmic Reticulum - metabolism
Skeletal Muscle
Staining and Labeling - methods
Time Factors
Uncoupling Agents - pharmacology
title The use of CalciumOrange-5N as a specific marker of mitochondrial Ca2+ in mouse skeletal muscle fibers
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