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IL-1β caused pancreatic β-cells apoptosis is mediated in part by endoplasmic reticulum stress via the induction of endoplasmic reticulum Ca2+ release through the c-Jun N-terminal kinase pathway

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Abstract

Endoplasmic reticulum (ER) homeostasis is crucial for β-cell function and survival. Direct as well as indirect evidence has pointed toward Ca2+ as an important determinant of interleukin-1β (IL-1β)-induced β-cell dysfunction and apoptosis. In the present study, we show that IL-1β-induced apoptosis and necrosis in primary rat β-cells and MIN6 cells largely depends on ER stress, ER Ca2+ release, and c-Jun N-terminal kinase (JNK) activation. β-cells also showed marked sensitivity to apoptosis induced by sarcoendoplasmic reticulum Ca2+ ATPase (SERCA) blockers, thapsigargin and cyclopiazonic acid (CPA). IL-1β induced ER Ca2+ release, which was paralleled by an IL-1β-dependent induction of JNK activation and the ER stress response, including activation of PRK (RNA-dependent protein kinase)-like ER kinase (PERK). Furthermore, reduced activation of JNK, utilizing JNK inhibitor SP600125, resulted in significant protection from IL-1β- or thapsigargin-induced apoptosis via ER stress. In conclusion, our results suggest that the IL-1β-induced depletion of ER Ca2+ and activation of the ER stress via JNK pathway are potential contributory mechanisms to β-cell death.

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Abbreviations

CPA:

Cyclopiazonic acid

eIF2α:

α Subunit of translation initiation factor 2

ER:

Endoplasmic reticulum

IL-1β:

Interleukin-1β

JNK:

c-Jun N-terminal kinase

PBA:

4-Phenyl butyric acid

PERK:

Double-stranded RNA-activated kinase-like kinase

SERCA:

Sarcoendoplasmic reticulum Ca2+ ATPase

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Acknowledgments

This work was sponsored by National Natural Science Foundation of China to Qin Wang (30770837) and supported by Shanghai Leading Academic Discipline Project, Project Number: B205.

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Correspondence to Q. Wang.

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Wang, Q., Zhang, H., Zhao, B. et al. IL-1β caused pancreatic β-cells apoptosis is mediated in part by endoplasmic reticulum stress via the induction of endoplasmic reticulum Ca2+ release through the c-Jun N-terminal kinase pathway. Mol Cell Biochem 324, 183–190 (2009). https://doi.org/10.1007/s11010-008-9997-9

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