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IP3 Receptor Biology and Endoplasmic Reticulum Calcium Dynamics in Cancer

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Cellular Biology of the Endoplasmic Reticulum

Part of the book series: Progress in Molecular and Subcellular Biology ((PMSB,volume 59))

Abstract

Intracellular Ca2+ signaling regulates a plethora of cellular functions. A central role in these processes is reserved for the inositol 1,4,5-trisphosphate receptor (IP3R), a ubiquitously expressed Ca2+-release channel, mainly located in the endoplasmic reticulum (ER). Three IP3R isoforms (IP3R1, IP3R2 and IP3R3) exist, encoded respectively by ITPR1, ITPR2 and ITPR3. The proteins encoded by these genes are each about 2700 amino acids long and assemble into large tetrameric channels, which form the target of many regulatory proteins, including several tumor suppressors and oncogenes. Due to the important role of the IP3Rs in cell function, their dysregulation is linked to multiple pathologies. In this review, we highlight the complex role of the IP3R in cancer, as it participates in most of the so-called “hallmarks of cancer”. In particular, the IP3R directly controls cell death and cell survival decisions via regulation of autophagy and apoptosis. Moreover, the IP3R impacts cellular proliferation, migration and invasion. Typical examples of the role of the IP3Rs in these various processes are discussed. The relative levels of the IP3R isoforms expressed and their subcellular localization, e.g. at the ER-mitochondrial interface, is hereby important. Finally, evidence is provided about how the knowledge of the regulation of the IP3R by tumor suppressors and oncogenes can be exploited to develop novel therapeutic approaches to fight cancer.

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Abbreviations

AMPK:

Adenosine monophosphate-activated protein kinase

APAF1:

Apoptotic protease-activating factor 1

ARM:

Armadillo solenoid fold

ATG:

Autophagy-related

BKCa Channel:

large conductance Ca2+-activated K+ channel

ER:

Endoplasmic reticulum

IICR:

IP3-induced Ca2+ release

IP3:

Inositol 1,4,5-trisphosphate

IP3R:

Inositol 1,4,5-trisphosphate receptor

ITPR:

Inositol 1,4,5-trisphosphate receptor gene

MOMP:

Mitochondrial outer membrane permeabilization

mPTP:

Mitochondrial permeability transition pore

mTORC1:

Mechanistic target of rapamycin complex 1

ROS:

Reactive oxygen species

SMAC:

Second mitochondria-derived activator of caspases

SOCE:

Store-operated Ca2+ entry

XIAP:

X-linked inhibitor of apoptosis protein

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Acknowledgements

Research work performed in our laboratory on this topic was supported by grants from the Research Foundation—Flanders (FWO) (G073109N, G057112N, G081913N, G063413N, G0C9114N, G092715N, G0A3416N, G090118N and G0A6919N), the Inter University Attraction Poles program P7/13 and by the Research Council of the KU Leuven (Concerted Actions G.O.A. 09/012 and grants 14/101 and C14/19/099). T.V. obtained a postdoctoral fellowship of the FWO. G.B. and J.B.P. are part of the FWO Scientific Research Network CaSign (W0.019.17N).

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The authors declare no conflict of interest.

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Correspondence to Jan B. Parys .

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Parys, J.B., Bultynck, G., Vervliet, T. (2021). IP3 Receptor Biology and Endoplasmic Reticulum Calcium Dynamics in Cancer. In: Agellon, L.B., Michalak, M. (eds) Cellular Biology of the Endoplasmic Reticulum . Progress in Molecular and Subcellular Biology, vol 59. Springer, Cham. https://doi.org/10.1007/978-3-030-67696-4_11

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