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Mitochondrial calcium uniporter protein MCU is involved in oxidative stress-induced cell death

Yajin Liao1, Yumin Hao, Hong Chen

  • 1State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.

Protein & Cell
|March 11, 2015
PubMed

Insights

The mitochondrial calcium uniporter (MCU) regulates cell death during oxidative stress. Targeting the MCU-VDAC1 complex may offer new therapies for related diseases.

Area of Science:

  • Cell Biology
  • Mitochondrial Function
  • Calcium Signaling

Background:

  • The mitochondrial calcium uniporter (MCU) is a key Ca(2+) transporter in eukaryotic cells.
  • The precise role of MCU in oxidative stress-induced cell death is not fully understood.

Purpose of the Study:

  • To investigate the function of MCU in oxidative stress-induced apoptosis.
  • To explore the interaction between MCU and VDAC1 in regulating cell death.

Main Methods:

  • Ectopic expression and knockdown of MCU in HeLa cells and primary cerebellar granule neurons (CGNs).
  • Measurement of mitochondrial Ca(2+) uptake after histamine stimulation.
  • Assessment of cell death induced by oxidative stress and VDAC1 overexpression.

Main Results:

  • Ectopically expressed MCU localized to mitochondria in both cell types.
  • MCU knockdown reduced mitochondrial Ca(2+) uptake and attenuated oxidative stress-induced cell death.
  • MCU interacts with VDAC1 and mediates VDAC1 overexpression-induced cell death in CGNs.

Conclusions:

  • The MCU-VDAC1 complex plays a critical role in regulating mitochondrial Ca(2+) uptake and oxidative stress-induced apoptosis.
  • This complex represents a potential therapeutic target for diseases associated with oxidative stress.

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