Abstract
The role of mitochondria in intracellular Ca2+ signaling relies mainly in its capacity to take up Ca2+ from the cytosol and thus modulate the cytosolic [Ca2+]. Because of the low Ca2+-affinity of the mitochondrial Ca2+-uptake system, this organelle appears specially adapted to take up Ca2+ from local high-Ca2+ microdomains and not from the bulk cytosol. Mitochondria would then act as local Ca2+ buffers in cellular regions where high-Ca2+ microdomains form, that is, mainly close to the cytosolic mouth of Ca2+ channels, both in the plasma membrane and in the endoplasmic reticulum (ER). One of the first targets proposed already in the 1990s to be regulated in this way by mitochondria were the store-operated Ca2+ channels (SOCE). Mitochondria, by taking up Ca2+ from the region around the cytosolic mouth of the SOCE channels, would prevent its slow Ca2+-dependent inactivation, thus keeping them active for longer. Since then, evidence for this mechanism has accumulated mainly in immunitary cells, where mitochondria actually move towards the immune synapse during T cell activation. However, in many other cell types the available data indicate that the close apposition between plasma and ER membranes occurring during SOCE activation precludes mitochondria from getting close to the Ca2+-entry sites. Alternative pathways for mitochondrial modulation of SOCE, both Ca2+-dependent and Ca2+-independent, have also been proposed, but further work will be required to elucidate the actual mechanisms at work. Hopefully, the recent knowledge of the molecular nature of the mitochondrial Ca2+ uniporter will allow soon more precise studies on this matter.
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Abbreviations
- [Ca2+]M :
-
Mitochondrial matrix free [Ca2+]
- CICR:
-
Ca2+-induced Ca2+ release
- CRAC channels:
-
Ca2+-release activated Ca2+ channels
- ER:
-
Endoplasmic reticulum
- GDAP1:
-
Ganglioside-induced differentiation-associated protein 1
- InsP3 :
-
Inositol 1,4,5-trisphosphate
- IS:
-
Immunological synapse or Immune synapse
- JPH1:
-
Junctophilin 1
- MCU:
-
Mitochondrial calcium uniporter
- NFAT:
-
Nuclear factor of activated T-cells
- SERCA:
-
Sarcoplasmic/endoplasmic-reticulum Ca2+-ATPase
- SOCE:
-
Store-operated Ca2+ entry
- STIM:
-
Stromal interaction molecule
- TRP:
-
Transient receptor potential
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Acknowledgements
This work was supported by a grant from the Spanish Ministerio de Ciencia e Innovación (BFU2011-25763). Jessica Matesanz-Isabel holds a FPI (Formación de Personal Investigador) fellowship from the Spanish Government. Jessica Arias-del-Val holds a fellowship from Junta de Castilla y León.
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Fonteriz, R., Matesanz-Isabel, J., Arias-del-Val, J., Alvarez-Illera, P., Montero, M., Alvarez, J. (2016). Modulation of Calcium Entry by Mitochondria. In: Rosado, J. (eds) Calcium Entry Pathways in Non-excitable Cells. Advances in Experimental Medicine and Biology, vol 898. Springer, Cham. https://doi.org/10.1007/978-3-319-26974-0_17
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