國家衛生研究院 NHRI:Item 3990099045/8022
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    題名: Arginine starvation impairs mitochondrial respiratory function in ASS1-Deficient breast cancer cells
    作者: Qiu, FM;Chen, YR;Liu, XY;Chu, CY;Shen, LJ;Xu, JH;Gaur, S;Forman, HJ;Zhang, H;Zheng, S;Yen, Y;Huang, J;Kung, HJ;Ann, DK
    貢獻者: Institute of Molecular and Genomic Medicine
    摘要: Autophagy is the principal catabolic response to nutrient starvation and is necessary to clear dysfunctional or damaged organelles, but excessive autophagy can be cytotoxic or cytostatic and contributes to cell death. Depending on the abundance of enzymes involved in molecule biosynthesis, cells can be dependent on uptake of exogenous nutrients to provide these molecules. Argininosuccinate synthetase 1 (ASS1) is a key enzyme in arginine biosynthesis, and its abundance is reduced in many solid tumors, making them sensitive to external arginine depletion. We demonstrated that prolonged arginine starvation by exposure to ADI-PEG20 (pegylated arginine deiminase) induced autophagy-dependent death of ASS1-deficient breast cancer cells, because these cells are arginine auxotrophs (dependent on uptake of extracellular arginine). Indeed, these breast cancer cells died in culture when exposed to ADI-PEG20 or cultured in the absence of arginine. Arginine starvation induced mitochondrial oxidative stress, which impaired mitochondrial bioenergetics and integrity. Furthermore, arginine starvation killed breast cancer cells in vivo and in vitro only if they were autophagy-competent. Thus, a key mechanism underlying the lethality induced by prolonged arginine starvation was the cytotoxic autophagy that occurred in response to mitochondrial damage. Last, ASS1 was either low in abundance or absent in more than 60% of 149 random breast cancer bio-samples, suggesting that patients with such tumors could be candidates for arginine starvation therapy.
    日期: 2014-04
    關聯: Science Signaling. 2014 Apr;7(319):Article number ra31.
    Link to: http://dx.doi.org/10.1126/scisignal.2004761
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1945-0877&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000334055300001
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84904421955
    顯示於類別:[龔行健] 期刊論文

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