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The Adenosine A3 Receptor Agonist Cl-IB-MECA Induces Cell Death Through Ca2+/ROS-Dependent Down Regulation of ERK and Akt in A172 Human Glioma Cells

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Abstract

Adenosine A3 receptor (A3AR) is coupled to G proteins that are involved in a variety of intracellular signaling pathways and physiological functions. 2-Chloro-N 6-(3-iodobenzyl) adenosine-5′-N-methylcarboxamide (Cl-IB-MECA), an agonist of A3AR, has been reported to induce cell death in various cancer cells. However, the effect of CI-IB-MECA on glioma cell growth is not clear. This study was undertaken to examine the effect of CI-IB-MECA on glioma cell viability and to determine its molecular mechanism. CI-IB-MECA inhibited cell proliferation and induced cell death in a dose- and time-dependent manner. Treatment of CI-IB-MECA resulted in an increase in intracellular Ca2+ followed by enhanced reactive oxygen species (ROS) generation. EGTA and N-acetylcysteine (NAC) blocked the cell death induced by CI-IB-MECA, suggesting that Ca2+ and ROS are involved in the Cl-IB-MECA-induced cell death. Western blot analysis showed that CI-IB-MECA induced the down-regulation of extracellular signal-regulated kinases (ERK) and Akt, which was prevented by EGTA, NAC, and the A3AR antagonist MRS1191. Transfection of constitutively active forms of MEK, the upstream kinase of ERK, and Akt prevented the cell death. CI-IB-MECA induced caspase-3 activation and the CI-IB-MECA-induced cell death was blocked by the caspase inhibitors DEVD-CHO and z-VAD-FMK. In addition, expression of XIAP and Survivin were decreased in cells treated with Cl-IB-MECA. Collectively, these findings demonstrate that CI-IB-MECA induce a caspase-dependent cell death through suppression of ERK and Akt mediated by an increase in intracellular Ca2+ and ROS generation in human glioma cells. These suggest that A3AR agonists may be a potential therapeutic agent for induction of apoptosis in human glioma cells.

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Acknowledgments

This work was supported for 2 years by Pusan National University Research Grant.

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  1. Department of Physiology, School of Medicine, Pusan National University, Beomeo-ri, Mulgeum-eup, Yangsan, 626-870, Gyungsangnam-do, Republic of Korea

    Thae Hyun Kim, Yong Keun Kim & Jae Suk Woo

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Correspondence to Jae Suk Woo.

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Kim, T.H., Kim, Y.K. & Woo, J.S. The Adenosine A3 Receptor Agonist Cl-IB-MECA Induces Cell Death Through Ca2+/ROS-Dependent Down Regulation of ERK and Akt in A172 Human Glioma Cells. Neurochem Res 37, 2667–2677 (2012). https://doi.org/10.1007/s11064-012-0855-5

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  • DOI: https://doi.org/10.1007/s11064-012-0855-5

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