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      Metformin and caffeic acid regulate metabolic reprogramming in human cervical carcinoma SiHa/HTB-35 cells and augment anticancer activity of Cisplatin via cell cycle regulation.

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          Abstract

          Metformin shows benefits in anticancer prevention in humans. In this study, normal human fibroblasts (FB) and metastatic cervical cancer cells (SiHa) were exposed to 10 mM Metformin (Met), 100 μM Caffeic Acid (trans-3,4-dihydroxycinnamic acid, CA) or combination of the compounds. Both drugs were selectively toxic towards cancer cells, but neither Met nor CA treatment suppressed growth of normal cells. Met and CA regulated metabolic reprogramming in SiHa tumor cells through different mechanisms: Met suppressed regulatory enzymes Glurtaminase (GLS) and Malic Enzyme 1 (ME1) and enhanced pyruvate oxidation via tricarboxylic acids (TCA) cycle, while CA acted as glycolytic inhibitor. Met/CA treatment impaired expression of Sterol Regulatory Element-Binding Protein 1 (SREBP1c) which resulted in alleviation of de novo synthesis of unsaturated fatty acid. The toxic action of CisPt was supported by Met and CA not only in tumor cells, but also during co-culture of SiHa GFP+ cells with fibroblasts. Furthermore, Met and CA augmented Cisplatin (CisPt) action against quiescent tumor cells involving reprogramming of cell cycle. Our findings provide new insights into specific targeting of mitochondrial metabolism in neoplastic cells and into designing new cisplatin-based selective strategies for treating cervical cancer in humans with regard to the role of tumor microenvironment.

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          Author and article information

          Journal
          Food Chem. Toxicol.
          Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association
          Elsevier BV
          1873-6351
          0278-6915
          Aug 2017
          : 106
          : Pt A
          Affiliations
          [1 ] Department of Radioligands, Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland. Electronic address: mtyszka@poczta.fm.
          [2 ] Department of Clinical Immunology, Institute of Pediatrics, Jagiellonian University Medical College, Wielicka 265, 30-663 Krakow, Poland. Electronic address: k.bukowska-strakova@uj.edu.pl.
          [3 ] Department of Transplantation, Faculty of Medicine, Jagiellonian University Medical College, Wielicka 258, 30-688 Krakow, Poland. Electronic address: mmajka@cm-uj.krakow.pl.
          Article
          S0278-6915(17)30300-9
          10.1016/j.fct.2017.05.065
          28576465
          1632bf98-ec9d-49b3-a464-e96f12dc13c7
          History

          Apoptosis,Caffeic Acid,Cancer,Cisplatin,Metabolic reprogramming,Metformin

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