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Mitochondrial Ca²⁺ Dynamics in MCU Knockout C. elegans Worms.

Pilar Álvarez-Illera¹, Paloma García-Casas¹, Rosalba I Fonteriz¹

¹Institute of Biology and Molecular Genetics (IBGM), Department of Biochemistry and Molecular Biology and Physiology, Faculty of Medicine, University of Valladolid and CSIC, Ramón y Cajal, 7, E-47005 Valladolid, Spain.

International Journal of Molecular Sciences

|November 19, 2020

Summary

Mitochondrial calcium (Ca2+) oscillations during normal worm pharynx activity are MCU-independent. However, the mitochondrial calcium uniporter (MCU) is crucial for rapid calcium uptake during strong pharyngeal muscle stimulation.

Keywords:

C. elegans MCU calcium dynamics knockout mitochondria mitochondrial calcium uniporter

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Area of Science:

Cellular Biology
Neuroscience
Biochemistry

Background:

Mitochondrial calcium (Ca2+) regulates ATP production and apoptosis.
Calcium entry into mitochondria is primarily mediated by the mitochondrial calcium uniporter (MCU).

Purpose of the Study:

To investigate mitochondrial Ca2+ dynamics in vivo in C. elegans.
To determine the role of the MCU in physiological and stimulated mitochondrial Ca2+ handling.

Main Methods:

Utilized C. elegans expressing mitochondrially-targeted YC3.60 yellow cameleon in pharyngeal muscle.
Compared mitochondrial Ca2+ dynamics in control and MCU-defective worms under basal and stimulated conditions (carbachol).

Main Results:

Small mitochondrial Ca2+ oscillations during normal pharyngeal activity were similar in control and MCU-defective worms.
Direct pharyngeal muscle stimulation revealed a significantly larger and prolonged mitochondrial Ca2+ increase in control worms compared to MCU-defective worms.
This indicates MCU is essential for rapid mitochondrial Ca2+ uptake during high-amplitude stimulation.

Conclusions:

The mitochondrial calcium uniporter (MCU) is critical for rapid mitochondrial Ca2+ uptake during strong cellular stimulation.
Low-amplitude mitochondrial Ca2+ oscillations under physiological conditions appear to utilize an MCU-independent pathway.