1. Dietary AGEs involvement in colonic inflammation and cancer: insights from an in vitro enterocyte model.
- Author
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Geicu OI, Stanca L, Voicu SN, Dinischiotu A, Bilteanu L, Serban AI, and Calu V
- Subjects
- Adenocarcinoma etiology, Adenocarcinoma genetics, Adenocarcinoma metabolism, Adenocarcinoma pathology, Antigens, Neoplasm genetics, Antigens, Neoplasm metabolism, Caseins chemistry, Catalase genetics, Catalase metabolism, Cell Line, Tumor, Colonic Neoplasms etiology, Colonic Neoplasms genetics, Colonic Neoplasms metabolism, Colonic Neoplasms pathology, Enterocytes metabolism, Enterocytes pathology, Extracellular Matrix drug effects, Extracellular Matrix metabolism, Glycogen Synthase Kinase 3 beta genetics, Glycogen Synthase Kinase 3 beta metabolism, Glycosylation, Humans, I-kappa B Proteins genetics, I-kappa B Proteins metabolism, Interleukin-1beta genetics, Interleukin-1beta metabolism, Interleukin-8 genetics, Interleukin-8 metabolism, Matrix Metalloproteinase 2 genetics, Matrix Metalloproteinase 2 metabolism, Matrix Metalloproteinase 9 genetics, Matrix Metalloproteinase 9 metabolism, Mitogen-Activated Protein Kinases genetics, Mitogen-Activated Protein Kinases metabolism, Models, Biological, NF-kappa B genetics, NF-kappa B metabolism, Phosphorylation, Proto-Oncogene Proteins c-akt genetics, Proto-Oncogene Proteins c-akt metabolism, Signal Transduction, Superoxide Dismutase genetics, Superoxide Dismutase metabolism, TOR Serine-Threonine Kinases genetics, TOR Serine-Threonine Kinases metabolism, Caseins pharmacology, Enterocytes drug effects, Gene Expression Regulation, Neoplastic, Glycation End Products, Advanced pharmacology
- Abstract
The number of colon cancer cases is increasing worldwide, and type II diabetes patients have an increased risk of developing colon cancer. Diet-borne advanced glycation end-products (AGEs) may promote neoplastic transformation; however, the mechanisms involved remain elusive. The present study helped to define the relationship between dietary AGEs and cancer progression. C2BBe1 adenocarcinoma enterocytes were exposed to 200 µg/mL glycated casein (AGEs-Csn) for up to 24 h. AGEs-Csn exposure resulted in increased cell proliferation, maladaptative changes in SOD and CAT activity and moderate levels of hydrogen peroxide (H
2 O2 ) intracellular accumulation. AGEs-Csn activated pro-survival and proliferation signalling, such as the phosphorylation of mTOR (Ser2448) and Akt (Ser473). GSK-3β phosphorylation also increased, potentially inducing extracellular matrix remodelling and thus enabling metastasis. Moreover, AGEs-Csn induced MMP-1, -3, -7, -9 and -10 expression and activated MMP-2 and MMP-9, which are regulators of the extracellular matrix and cytokine functions. AGEs-Csn induced inflammatory responses that included extracellular IL-1β at 6 h; time-dependent increases in IL-8; RAGE and NF-κB p65 upregulation; and IκB inhibition. Co-treatment with anti-RAGE or anti-TNF-α blocking antibodies and AGEs-Csn partially counteracted these changes; however, IL-8, MMP-1 and -10 expression and MMP-9 activation were difficult to prevent. AGEs-Csn perpetuated signalling that led to cell proliferation and matrix remodelling, strengthening the link between AGEs and colorectal cancer aggressiveness.- Published
- 2020
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