Mitochondrial calcium exchange in physiology and disease

Area of Science:

• Cell Biology
• Biochemistry
• Physiology

Background:

• Mitochondrial calcium (_mCa²⁺) transport is crucial for cellular metabolism, signaling, and survival.
• Dysregulation of _mCa²⁺ cycling is linked to acquired diseases (heart failure, stroke, neurodegeneration, diabetes, cancer) and inherited neuromuscular disorders.

Purpose of the Study:

• To provide an overview of _mCa²⁺ transport.
• To comprehensively examine the molecular machinery mediating calcium flux across the inner mitochondrial membrane.
• To discuss the physiological implications and disease relevance of _mCa²⁺ homeostasis.

Main Methods:

• Review of existing literature on mitochondrial calcium transport.
• Examination of key proteins involved in _mCa²⁺ flux, including the mitochondrial uniporter complex (MCU, EMRE, MICU1-3, MCUB, MCUR1), NCLX, LETM1, mitochondrial ryanodine receptor, and mitochondrial permeability transition pore.
• Analysis of the role of _mCa²⁺ homeostasis in human diseases.

Main Results:

• Identification of key proteins responsible for mitochondrial calcium uptake and efflux over the past decade.
• Detailed description of the molecular components governing _mCa²⁺ transport.
• Evaluation of how altered _mCa²⁺ homeostasis contributes to various human pathologies.

Conclusions:

• Understanding _mCa²⁺ exchange mechanisms holds significant promise for treating diseases associated with disrupted calcium handling.
• Highlights opportunities and challenges for therapeutic interventions targeting aberrant _mCa²⁺ handling.
• Summarizes critical unanswered questions in the field of _mCa²⁺ flux biology.