High- and low-calcium-dependent mechanisms of mitochondrial calcium signalling

András Spät, Gergo Szanda, György Csordás, György Hajnóczky

Research output: Contribution to journalReview article

107 Citations (Scopus)

Abstract

The Ca2+ coupling between endoplasmic reticulum (ER) and mitochondria is central to multiple cell survival and cell death mechanisms. Cytoplasmic [Ca2+] ([Ca2+]c) spikes and oscillations produced by ER Ca2+ release are effectively delivered to the mitochondria. Propagation of [Ca2+]c signals to the mitochondria requires the passage of Ca2+ across three membranes, namely the ER membrane, the outer mitochondrial membrane (OMM) and the inner mitochondrial membrane (IMM). Strategic positioning of the mitochondria by cytoskeletal transport and interorganellar tethers provides a means to promote the local transfer of Ca2+ between the ER membrane and OMM. In this setting, even >100 μM [Ca2+] may be attained to activate the low affinity mitochondrial Ca2+ uptake. However, a mitochondrial [Ca2+] rise has also been documented during submicromolar [Ca2+]c elevations. Evidence has been emerging that Ca2+ exerts allosteric control on the Ca2+ transport sites at each membrane, providing mechanisms that may facilitate the Ca2+ delivery to the mitochondria. Here we discuss the fundamental mechanisms of ER and mitochondrial Ca2+ transport, particularly the control of their activity by Ca2+ and evaluate both high- and low-[Ca2+]-activated mitochondrial calcium signals in the context of cell physiology.

Original languageEnglish
Pages (from-to)51-63
Number of pages13
JournalCell Calcium
Volume44
Issue number1
DOIs
Publication statusPublished - Jul 2008

Keywords

  • Ca
  • Endoplasmic reticulum
  • IP receptor
  • Mitochondria
  • Mitochondrial dynamics
  • Ryanodine receptor
  • Sarcoplasmic reticulum
  • Uniporter
  • VDAC

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cell Biology

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