Reciprocal regulation of autophagy and dNTP pools in human cancer cells

Wei Chen, Lisheng Zhang, Keqiang Zhang, Bingsen Zhou, Mei Ling Kuo, Shuya Hu, Linling Chen, Michelle Tang, Yun Ru Chen, Lixin Yang, David K. Ann, Yun Yen

研究成果: 雜誌貢獻文章

28 引文 斯高帕斯(Scopus)

摘要

Ribonucleotide reductase (RNR) plays a critical role in catalyzing the biosynthesis and maintaining the intracellular concentration of 4 deoxyribonucleoside triphosphates (dNTPs). Unbalanced or deficient dNTP pools cause serious genotoxic consequences. Autophagy is the process by which cytoplasmic constituents are degraded in lysosomes to maintain cellular homeostasis and bioenergetics. However, the role of autophagy in regulating dNTP pools is not well understood. Herein, we reported that starvation- or rapamycin-induced autophagy was accompanied by a decrease in RNR activity and dNTP pools in human cancer cells. Furthermore, downregulation of the small subunit of RNR (RRM2) by siRNA or treatment with the RNR inhibitor hydroxyurea substantially induced autophagy. Conversely, cancer cells with abundant endogenous intracellular dNTPs or treated with dNTP precursors were less responsive to autophagy induction by rapamycin, suggesting that autophagy and dNTP pool levels are regulated through a negative feedback loop. Lastly, treatment with si-RRM2 caused an increase in MAP1LC3B, ATG5, BECN1, and ATG12 transcript abundance in xenografted Tu212 tumors in vivo. Together, our results revealed a previously unrecognized reciprocal regulation between dNTP pools and autophagy in cancer cells.

原文英語
頁(從 - 到)1272-1284
頁數13
期刊Autophagy
10
發行號7
DOIs
出版狀態已發佈 - 一月 1 2014

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

指紋 深入研究「Reciprocal regulation of autophagy and dNTP pools in human cancer cells」主題。共同形成了獨特的指紋。

  • 引用此

    Chen, W., Zhang, L., Zhang, K., Zhou, B., Kuo, M. L., Hu, S., Chen, L., Tang, M., Chen, Y. R., Yang, L., Ann, D. K., & Yen, Y. (2014). Reciprocal regulation of autophagy and dNTP pools in human cancer cells. Autophagy, 10(7), 1272-1284. https://doi.org/10.4161/auto.28954