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• W2142045414 abstract "ENOX2 (tNOX), a tumor-associated cell surface ubiquinol (NADH) oxidase, functions as an alternative terminal oxidase for plasma membrane electron transport. Ubiquitous in all cancer cell lines studied thus far, ENOX2 expression correlates with the abnormal growth and division associated with the malignant phenotype. ENOX2 has been proposed as the cellular target for various quinone site inhibitors that demonstrate anticancer activity such as the green tea constituent epigallocatechin-3-gallate (EGCg) and the isoflavene phenoxodiol (PXD). Here we present a possible mechanism that explains how these substances result in apoptosis in cancer cells by ENOX2-mediated alterations of cytosolic amounts of NAD+ and NADH. When ENOX2 is inhibited, plasma membrane electron transport is diminished, and cytosolic NADH accumulates. We show in HeLa cells that NADH levels modulate the activities of two pivotal enzymes of sphingolipid metabolism: sphingosine kinase 1 (SK1) and neutral sphingomyelinase (nSMase). Their respective products sphingosine 1-phosphate (S1P) and ceramide (Cer) are key determinants of cell fate. S1P promotes cell survival and Cer promotes apoptosis. Using plasma membranes isolated from cervical adenocarcinoma (HeLa) cells as well as purified proteins of both bacterial and human origin, we demonstrate that NADH inhibits SK1 and stimulates nSMase, while NAD+ inhibits nSMase and has no effect on SK1. Additionally, intact HeLa cells treated with ENOX2 inhibitors exhibit an increase in Cer and a decrease in S1P. Treatments that stimulate cytosolic NADH production potentiate the antiproliferative effects of ENOX2 inhibitors while those that attenuate NADH production or stimulate plasma membrane electron transport confer a survival advantage. J. Cell. Biochem. 110: 1504–1511, 2010. © 2010 Wiley-Liss, Inc." @default.
• W2142045414 created "2016-06-24" @default.
• W2142045414 creator A5028061632 @default.
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• W2142045414 date "2010-06-01" @default.
• W2142045414 modified "2023-09-30" @default.
• W2142045414 title "Reciprocal Relationship Between Cytosolic NADH and ENOX2 Inhibition Triggers Sphingolipid-Induced Apoptosis in HeLa Cells" @default.
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• W2142045414 doi "https://doi.org/10.1002/jcb.22724" @default.
• W2142045414 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20518072" @default.
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