Oxidative and endoplasmic reticulum stress in β-cell dysfunction in diabetes

Area of Science:

• Endocrinology
• Cell Biology
• Diabetes Research

Background:

• Pancreatic beta-cell dysfunction, characterized by insufficient insulin production, is central to diabetes etiology.
• Oxidative stress and endoplasmic reticulum (ER) stress significantly impair beta-cell function, impacting insulin biosynthesis, secretion, inflammation, and apoptosis, particularly in type 2 diabetes (T2D).

Purpose of the Study:

• To review the detrimental effects of oxidative and ER stress on beta-cell function in diabetes.
• To explore the interplay between these stresses and their role in T2D pathophysiology.
• To highlight recent findings on inflammatory cytokines and the protective role of interleukin 22.

Main Methods:

• Literature review focusing on oxidative stress, ER stress, and beta-cell dysfunction in diabetes.
• Analysis of evidence linking environmental factors in T2D to beta-cell stress.
• Summary of experimental findings on inflammatory cytokines and interleukin 22's effects.

Main Results:

• Oxidative and ER stress are intertwined and directly impair insulin biosynthesis and secretion via the unfolded protein response.
• In T2D, beta-cell stress is exacerbated by environmental factors like glucolipotoxicity and inflammatory cytokines.
• Interleukin 22 demonstrates protective effects against oxidative stress in beta-cells and reverses diabetes pathophysiology in animal models.

Conclusions:

• Beta-cell dysfunction in T2D is driven by interconnected oxidative and ER stress, influenced by environmental factors.
• Interleukin 22 offers a potential therapeutic strategy for protecting beta-cells and managing diabetes.
• Evidence suggests beta-cell dysfunction is reversible in T2D, with opportunities for therapeutic intervention to restore glycaemic control.