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  • Original Paper
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ARK5 suppresses the cell death induced by nutrient starvation and death receptors via inhibition of caspase 8 activation, but not by chemotherapeutic agents or UV irradiation

Abstract

AMPK is a serine/threonine protein kinase family and we recently identified a novel member, ARK5. The activation of ARK5 is triggered by Akt, and ARK5 induces tumor cell survival during nutrient starvation. In the current study, we investigated the mechanisms of induction of cell survival by ARK5. Human hepatoma HepG2 cells undergo necrotic cell death within 24 h after the start of glucose starvation, and the cell death signaling has been found to be mediated by death-receptor-independent activation of caspase 8. When HepG2 cells were transfected with ARK5 expression vector and subjected to several cell death stimuli, ARK5 was found to suppress cell death by glucose starvation, TRAIL, and TNF-α, but not by ultraviolet irradiation, camptothecin, or doxorubicin. Western blotting analysis revealed that both TRAIL and glucose starvation induced Bid cleavage and FLIP degradation following caspase 8 activation in a time-dependent manner, and ARK5 overexpression clearly delayed Bid cleavage, FLIP degradation, and caspase 8 activation. On the basis of the results of this study, we report that cell survival induced by ARK5 is, at least in part, due to inhibition of caspase 8 activation.

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Abbreviations

AMPK:

AMP-activated protein kinase

CPT:

camptothecin

Dox:

doxorubicin

PI:

propidium iodide

TNF:

tumor necrosis factor

TRAIL:

TNF-related apoptosis-inducing ligand

UV:

ultraviolet

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Acknowledgements

This work was partly supported by a grant for the second-term comprehensive 10-year strategy of cancer control from the Ministry of Health, Welfare and Labour, and a grant for Medical Frontier Program from the Ministry of Health, Welfare and Labour. AS, GK, and JL are recipients of the Research Resident Fellowship Award from the Foundation for Promotion of Cancer Research.

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Correspondence to Hiroyasu Esumi.

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Suzuki, A., Kusakai, Gi., Kishimoto, A. et al. ARK5 suppresses the cell death induced by nutrient starvation and death receptors via inhibition of caspase 8 activation, but not by chemotherapeutic agents or UV irradiation. Oncogene 22, 6177–6182 (2003). https://doi.org/10.1038/sj.onc.1206899

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