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Curcumin Modulates Glycolytic Metabolism and Inflammatory Cytokines via Nrf 2 in Dalton's Lymphoma Ascites Cells In Vivo

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Background: Warburg effect is characterized by the upregulation of HIF-1 and c-Myc regulated LDH-A, even aerobically owing to hypoxic environment and alterations in oncogenes or tumor suppressor genes in cancer. Reduced antioxidant defence system in transformed cells favors higher ROS production, which plays a significant role in carcinogenesis and acts as an important regulator of NF-ΚB. In addition, various proinflammatory cytokines play active roles in maintenance and progression of cancer.

Objective: In continuation with our previous studies illustrating the long-term effect of curcumin using a liver tissue, present study was aimed to elucidate the anti-cancer effect of curcumin due to its long-term effect in the regulation of glycolytic metabolism, NF-ΚB activation, expression of proinflammatory cytokines in Dalton’s lymphoma ascites cells in vivo.

Method: Spectrophotometric assays, RT-PCR and EMSA were performed to address the problems.

Results: Results revealed that curcumin-induced activation of antioxidant enzymes, Nrf2 and downstream signaling gene NQO1. Reduction of oxidative stress, down-regulation of NADPH: Oxidase, decline in ROS and H2O2 levels were also observed. Activation of NF-ΚB, expression of COX2, HIF-1α and cMyc, as well as expression and activity of LDH-A were significantly reduced by curcumin. Besides, expression of proinflammatory cytokines was significantly down-regulated via reducing binding of nuclear protein with AP-1, NF-IL6, ETS and NF-ΚB binding elements of IL-1α, IL-1β, TNF-α and IL-6 promoters, respectively.

Conclusion: Curcumin downregulates glycolytic metabolism via modulation of stress-activated genes and reduces oxidative stress by enhancing antioxidant defence system, which inhibits activation of NF-ΚB signaling and expression of proinflammatory cytokines in Dalton’s lymphoma ascites cells in vivo.
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Keywords: NF-ΚB; Nrf2; Oxidative stress; anaerobic metabolism; antioxidant defence system; c-Myc; curcumin; proinflammatory cytokines

Document Type: Research Article

Publication date: 01 September 2018

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