An asymmetrically dimethylarginated nuclear 90 kDa protein (p90aDMA) induced by interleukin (IL)-2, IL-4 or IL-6 in the tumor microenvironment is selectively degraded by autophagy

Sun,Lei; Xia,Wu-Yan; Zhao,Shao-Hua; Liu,Ning; Liu,Shan-Shan; Xiu,Peng; Li,Lin-Feng; Cao,Xue-Lei; Gao,Jian-Xin

doi:10.3892/ijo.2016.3450

An asymmetrically dimethylarginated nuclear 90 kDa protein (p90aDMA) induced by interleukin (IL)-2, IL-4 or IL-6 in the tumor microenvironment is selectively degraded by autophagy

Authors:
- Lei Sun
- Wu-Yan Xia
- Shao-Hua Zhao
- Ning Liu
- Shan-Shan Liu
- Peng Xiu
- Lin-Feng Li
- Xue-Lei Cao
- Jian-Xin Gao
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Affiliations: State Key Laboratory of Oncogenes and Related Genes, Renji-Med X Clinical Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China, Department of Geriatric Cardiology, Qi Lu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China, Department of Biliary-Pancreatic Surgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, P.R. China, Department of Clinical Laboratory, Qi Lu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
Published online on: March 23, 2016 https://doi.org/10.3892/ijo.2016.3450
Pages: 2461-2471

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Abstract

Protein arginine methylation is a common posttranslational modification resulting in the generation of asymmetric dimethylarginine (aDMA) and symmetric dimethylarginine (sDMA). Currently, the regulation of aDMA or sDMA by hypoxia, nutrient stavation or cytokines in the tumor microenvironment remains largely unknown. Here we show that p90aDMA, p70aDMA and p90sDMA, endogenous proteins containing aDMA or sDMA with mass 70 or 90 kDa, were widely and dominantly expressed in breast cancer cell lines. Notably, it was p90aDMA rather than p90sDMA that accumulated in the nucleus upon stimulation of cancer cells with interleukin (IL)-2, IL-4, IL-6 but not IL-8. In addition, the p90aDMA accumulation could be inhibited after treatment with a global methyltrasferase inhibitor, adenosine-2',3'-dialdehyde (AdOx). It seemed that some endogenous proteins in cancer cells were asymmetrically arginine-methylated upon exposure to some cytokines.. Furthermore, endogenous proteins of aDMA, such as p90aDMA and p70aDMA, were degraded in response to hypoxia, nutrient starvation and rapamycin treatment in breast and cervical cancer cells. IL-2/4/6 slightly increased basal autophagy but slightly decreased the rapamycin‑induced autophagy in cancer cells, suggesting that IL-2/4/6 and autophagy inducers play distinct roles in the regulation of aDMA of proteins. Conversely, rapamycin accumulated p90sDMA in MDA-MB‑231 and MCF-7 cells. Taken together, our results add a new dimension to the complexity of arginine methylated regulation in response to various stimuli and provide the first evidence that aDMA serves as one specific degradation signal of selective autophagy.

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