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Proc Natl Acad Sci U S A. 2014 Sep 30;111(39):14147-52. doi: 10.1073/pnas.1404171111. Epub 2014 Aug 13.

Arginine starvation-associated atypical cellular death involves mitochondrial dysfunction, nuclear DNA leakage, and chromatin autophagy.

Author information

1
Department of Biochemistry and Molecular Medicine, UC Davis Comprehensive Cancer Center, Sacramento, CA 95817; NSF Center for Biophotonics Science and Technology, University of California, Davis, CA 95817; Integrated Laboratory, Center of Translational Medicine and Graduate Institute of Translational Medicine, Taipei Medical University, Taipei, Taiwan 110, Republic of China; and.
2
Department of Molecular Pharmacology, Beckman Research Institute, City of Hope, Duarte, CA 91010;
3
Department of Molecular and Cellular Biology and.
4
Integrated Laboratory, Center of Translational Medicine and Department of Molecular Pharmacology, Beckman Research Institute, City of Hope, Duarte, CA 91010;
5
Department of Biochemistry and Molecular Medicine, UC Davis Comprehensive Cancer Center, Sacramento, CA 95817; NSF Center for Biophotonics Science and Technology, University of California, Davis, CA 95817;
6
Department of Surgery, Division of Surgical Oncology, University of California, Davis, CA 95817;
7
Integrated Laboratory, Center of Translational Medicine and Department of Molecular Pharmacology, Beckman Research Institute, City of Hope, Duarte, CA 91010; dann@coh.org hkung@nhri.org.tw.
8
Department of Biochemistry and Molecular Medicine, UC Davis Comprehensive Cancer Center, Sacramento, CA 95817; Integrated Laboratory, Center of Translational Medicine and National Health Research Institutes, Taipei, Taiwan 115, Republic of China dann@coh.org hkung@nhri.org.tw.

Abstract

Autophagy is the principal catabolic prosurvival pathway during nutritional starvation. However, excessive autophagy could be cytotoxic, contributing to cell death, but its mechanism remains elusive. Arginine starvation has emerged as a potential therapy for several types of cancers, owing to their tumor-selective deficiency of the arginine metabolism. We demonstrated here that arginine depletion by arginine deiminase induces a cytotoxic autophagy in argininosuccinate synthetase (ASS1)-deficient prostate cancer cells. Advanced microscopic analyses of arginine-deprived dying cells revealed a novel phenotype with giant autophagosome formation, nucleus membrane rupture, and histone-associated DNA leakage encaptured by autophagosomes, which we shall refer to as chromatin autophagy, or chromatophagy. In addition, nuclear inner membrane (lamin A/C) underwent localized rearrangement and outer membrane (NUP98) partially fused with autophagosome membrane. Further analysis showed that prolonged arginine depletion impaired mitochondrial oxidative phosphorylation function and depolarized mitochondrial membrane potential. Thus, reactive oxygen species (ROS) production significantly increased in both cytosolic and mitochondrial fractions, presumably leading to DNA damage accumulation. Addition of ROS scavenger N-acetyl cysteine or knockdown of ATG5 or BECLIN1 attenuated the chromatophagy phenotype. Our data uncover an atypical autophagy-related death pathway and suggest that mitochondrial damage is central to linking arginine starvation and chromatophagy in two distinct cellular compartments.

KEYWORDS:

ADI-PEG20; arginine auxotrophy; cancer therapy; metabolic stress; prostate cancer

Comment in

PMID:
25122679
PMCID:
PMC4191793
DOI:
10.1073/pnas.1404171111
[Indexed for MEDLINE]
Free PMC Article

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