| A key role for Mg(2+) in TRPM7's control of ROS levels during cell stress. | |
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MedLine Citation:
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PMID: 22587440 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The TRPM7 (transient receptor potential melastatin 7) channel has been shown to play a pivotal role in cell survival during brain ischaemia as well as in the survival of other cell types challenged with apoptotic stimuli. Ca(2+) is thought to be central to the channel's ability to regulate ROS (reactive oxygen species) production. However, channel-mediated entry of Mg(2+) and Zn(2+) have also been implicated in cell death. In the present study, we show that depletion of TRPM7 by RNA interference in fibroblasts increases cell resistance to apoptotic stimuli by decreasing ROS levels in an Mg(2+)-dependent manner. Depletion of TRPM7 lowered cellular Mg(2+), decreased the concentration of ROS and lessened p38 MAPK (mitogen-activated protein kinase) and JNK (c-Jun N-terminal kinase) activation as well as decreased caspase 3 activation and PARP [poly(ADP-ribose) polymerase] cleavage in response to apoptotic stimuli. Re-expression of TRPM7 or of a kinase-inactive mutant of TRPM7 in TRPM7-knockdown cells increased cellular Mg(2+) and ROS levels, as did expression of the Mg(2+) transporter SLC41A2 (solute carrier family 41 member 2). In addition, expression of SLC41A2 increased the sensitivity of TRPM7-knockdown cells to apoptotic stimuli and boosted ROS generation in response to cell stress. Taken together, these data uncover an essential role for Mg(2+) in TRPM7's control of cell survival and in the regulation of cellular ROS levels. |
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Authors:
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Hsiang-Chin Chen; Li-Ting Su; Omayra González-Pagán; Jeffrey D Overton; Loren W Runnels |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: The Biochemical journal Volume: 445 ISSN: 1470-8728 ISO Abbreviation: Biochem. J. Publication Date: 2012 Aug |
Date Detail:
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Created Date: 2012-07-13 Completed Date: 2012-09-26 Revised Date: 2013-04-16 |
Medline Journal Info:
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Nlm Unique ID: 2984726R Medline TA: Biochem J Country: England |
Other Details:
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Languages: eng Pagination: 441-8 Citation Subset: IM |
Affiliation:
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Department of Pharmacology, UMDNJ-Robert Wood Johnson Medical School, 675 Hoes Lane, Piscataway, NJ 08854, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Apoptosis Cation Transport Proteins / metabolism Cell Survival Gene Knockdown Techniques JNK Mitogen-Activated Protein Kinases / metabolism Magnesium / metabolism* Mice Oxidative Stress RNA Interference Reactive Oxygen Species / metabolism Recombinant Proteins / genetics, metabolism Swiss 3T3 Cells TRPM Cation Channels / antagonists & inhibitors, genetics, metabolism* p38 Mitogen-Activated Protein Kinases / metabolism |
| Grant Support | |
ID/Acronym/Agency:
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GM080753/GM/NIGMS NIH HHS; R01 GM080753/GM/NIGMS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Cation Transport Proteins; 0/Reactive Oxygen Species; 0/Recombinant Proteins; 0/Slc41a2 protein, mouse; 0/TRPM Cation Channels; 7439-95-4/Magnesium; EC 2.7.1.-/Trpm7 protein, mouse; EC 2.7.11.24/JNK Mitogen-Activated Protein Kinases; EC 2.7.11.24/p38 Mitogen-Activated Protein Kinases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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