Abstract
Insulin resistance (IRe) and a failure of insulin secretion are the major features of the early pathophysiology of type-2 diabetes mellitus (T2D) but the etiology is still not well understood. We suggest that: 1. The cellular mechanisms that protect against oxidative stress per se are capable of creating a reactive species-dependent IRe. 2. Reactive speciesinduced mitochondrial dysfunction can lead to disruption of lipid metabolism, increased intracellular lipid content, and can also contribute to lipid-dependent IRe in myocytes and adipocytes. 3. Metabolic secretagogues that stimulate insulin secretion by the activation of initial steps in the glucose-stimulated insulin secretion pathway can also lead to increased reactive species production and cellular destruction contributing to ß-cell damage and apoptosis. These events that underlie the repair mechanisms in ß-cells, muscle and adipocytes, are important factors in the early etiology of T2D, leading to both IRe and decreased insulin secretion. This hypothesis is supported by data from multiple disciplines and includes aging, obesity and genetic factors in promoting multiple failures in this system leading to the onset of T2D. On the basis of this hypothesis therapeutic strategies should be directed towards increasing insulin secretion and reducing IRe without increasing reactive species production or concentration. Pharmacological or other approaches that result in the activation of mitochondrial biogenesis could be beneficial for both IRe and T2D.
Keywords: Beta-cells, Insulin resistance, Lipids, Mitochondria, Reactive oxygen species
Current Diabetes Reviews
Title: Reactive Species, Cellular Repair and Risk Factors in the Onset of Type 2 Diabetes Mellitus: Review and Hypothesis
Volume: 2 Issue: 2
Author(s): Leonid E. Fridlyand and Louis H. Philipson
Affiliation:
Keywords: Beta-cells, Insulin resistance, Lipids, Mitochondria, Reactive oxygen species
Abstract: Insulin resistance (IRe) and a failure of insulin secretion are the major features of the early pathophysiology of type-2 diabetes mellitus (T2D) but the etiology is still not well understood. We suggest that: 1. The cellular mechanisms that protect against oxidative stress per se are capable of creating a reactive species-dependent IRe. 2. Reactive speciesinduced mitochondrial dysfunction can lead to disruption of lipid metabolism, increased intracellular lipid content, and can also contribute to lipid-dependent IRe in myocytes and adipocytes. 3. Metabolic secretagogues that stimulate insulin secretion by the activation of initial steps in the glucose-stimulated insulin secretion pathway can also lead to increased reactive species production and cellular destruction contributing to ß-cell damage and apoptosis. These events that underlie the repair mechanisms in ß-cells, muscle and adipocytes, are important factors in the early etiology of T2D, leading to both IRe and decreased insulin secretion. This hypothesis is supported by data from multiple disciplines and includes aging, obesity and genetic factors in promoting multiple failures in this system leading to the onset of T2D. On the basis of this hypothesis therapeutic strategies should be directed towards increasing insulin secretion and reducing IRe without increasing reactive species production or concentration. Pharmacological or other approaches that result in the activation of mitochondrial biogenesis could be beneficial for both IRe and T2D.
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Cite this article as:
Fridlyand E. Leonid and Philipson H. Louis, Reactive Species, Cellular Repair and Risk Factors in the Onset of Type 2 Diabetes Mellitus: Review and Hypothesis, Current Diabetes Reviews 2006; 2 (2) . https://dx.doi.org/10.2174/157339906776818541
DOI https://dx.doi.org/10.2174/157339906776818541 |
Print ISSN 1573-3998 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6417 |
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