Abstract
Introduction
The effects of insulin resistance in human diseases are of paramount importance. Since the original proposal by the WHO indicating insulin resistance as the common substrate of the metabolic syndrome, large data are now available on its significance in cardiovascular diseases, nonalcoholic fatty liver disease and cancer risk.
Materials and methods
We reviewed the evidence linking hyperinsulinemia to insulin resistance and ultimately to increased cancer risk. Insulin resistance, by reducing substrate flux along the PI3-K pathway, is followed by compensatory hyperinsulinemia, considered a potential stimulus for cancerogenesis along the MAP-K pathway. Adaptive mechanisms of fat storage, promoted by insulin resistance, chronically maintained in an obesiogenic environment, may lead to oxidative stress and inflammation and modify the immune responses, further increasing the carcinogenic potential. The increased cancer risk associated with obesity, type 2 diabetes and nonalcoholic fatty liver may thus be fueled by hyperinsulinemia. Insulin secretagogs and insulin treatment, by raising circulating insulin levels, further increase cancer risk, whereas insulin sensitizers are associated with decreased cancer risk (all sites) and specifically decrease hepatocellular carcinoma. Likewise, drugs related to the incretin system, which are weight neutral or even reduce whole-body and hepatic fat, improve insulin sensitivity and potentially reduce the cancer risk.
Conclusion
New diabetes treatments might thus help decrease the future burden of diabetes-associated cancer and particularly of hepatocellular carcinoma.
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Abbreviations
- ChREBP:
-
Carbohydrate response element-binding protein
- DPP-4i:
-
Dipeptidyl-peptidase-4 inhibitors
- EGP:
-
Endogenous glucose production
- FFA:
-
Free fatty acid
- FPI:
-
Fasting plasma insulin
- G6PC:
-
Glucose 6-phosphatase
- GCKR:
-
Glucokinase regulatory protein
- GLP-1:
-
Glucagon-like peptide-1
- GLUT:
-
Glucose transporter
- HCC:
-
Hepatocellular carcinoma
- IR:
-
Insulin resistance
- LDL:
-
Low-density lipoprotein
- LPL:
-
Stimulating lipoprotein-lipase
- MAP-K:
-
Mitogen-activated protein kinase
- NAFLD:
-
Nonalcoholic fatty liver disease
- PI3-K:
-
Phosphatidyl-inositol-3-kinase
- PPAR:
-
Peroxisome proliferator-activated receptor
- ROS:
-
Reactive oxygen species
- T2DM:
-
Type 2 diabetes
- TZDs:
-
Thiazolidinediones
- VLDL:
-
Very-low-density lipoprotein
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Acknowledgements
The authors have received funding from the European Community’s Seventh Framework Program (FP7/2007–2013) under grant agreement no. HEALTH-F2-2009-241762 for the project FLIP. S.M. is supported by a specific research contract within the same program.
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The report will present data derived from the literature; no specific experiments were carried out on human or animal subjects requiring Ethical standard statements.
Conflict of interest
Luca Montesi, Arianna Mazzotti, Simona Moscatiello Gabriele Forlani, Giulio Marchesini declare that no conflict of interest exists in relation to the material included in this report.
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Based on a lecture given at the Fourth Kolkata Liver Meeting, West Bengal, India, on 16 December 2012.
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Montesi, L., Mazzotti, A., Moscatiello, S. et al. Insulin resistance: mechanism and implications for carcinogenesis and hepatocellular carcinoma in NASH. Hepatol Int 7 (Suppl 2), 814–822 (2013). https://doi.org/10.1007/s12072-013-9451-2
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DOI: https://doi.org/10.1007/s12072-013-9451-2