Adipose Tissue in Obesity-Related Inflammation and Insulin Resistance: Cells, Cytokines, and Chemokines

Adipose Tissue in Obesity-Related Inflammation and Insulin Resistance: Cells, Cytokines, and Chemokines

2013 | Kassem Makki, Philippe Froguel, and Isabelle Wolowczuk
Adipose tissue is a complex organ with diverse functions, including energy storage, metabolic regulation, and immune functions. It contains various immune cells, such as macrophages and T cells, making it a key player in both metabolism and immunity. Obesity and lipodystrophy disrupt adipose tissue function, leading to changes in cytokine, chemokine, and hormone expression, as well as immune cell composition. These changes contribute to systemic inflammation and insulin resistance. This review discusses how adipose-resident immune cells regulate inflammation and insulin resistance through cytokine and chemokine secretion, highlighting major research questions in the field. Obesity is a proinflammatory condition, with adipose tissue and immune cells contributing to increased levels of proinflammatory cytokines. Chronic low-grade systemic inflammation, termed "metabolic inflammation," is a key factor in the development of insulin resistance and type 2 diabetes. Adipose tissue, particularly white adipose tissue (WAT), is the main site of systemic inflammation in obesity. Adipokines, such as TNF-α, IL-6, leptin, adiponectin, and resistin, play critical roles in insulin resistance. These adipokines can have proinflammatory or anti-inflammatory effects, influencing insulin signaling and glucose metabolism. TNF-α is a potent proinflammatory cytokine secreted by adipose tissue macrophages, contributing to insulin resistance. IL-6 is a multifaceted cytokine involved in inflammation, immune responses, and metabolism. It is secreted by WAT and can influence insulin resistance. Leptin, secreted by adipocytes, regulates energy balance and metabolism but is often resistant in obesity, leading to reduced lipid oxidation and insulin resistance. Adiponectin, an anti-inflammatory adipokine, improves insulin sensitivity and is reduced in obesity. Resistin, secreted by adipocytes, can interfere with insulin signaling and promote inflammation. IL-7, a cytokine supporting T cell survival, is also secreted by adipose tissue and contributes to body weight regulation. Adipose tissue remodeling in obesity involves changes in immune cell composition, with a shift from anti-inflammatory M2 macrophages to proinflammatory M1 macrophages. Myeloid-derived suppressor cells (MDSCs) play a role in insulin sensitivity and may be involved in the development of insulin resistance. Understanding the complex interactions between adipose tissue, immune cells, and adipokines is crucial for developing therapeutic strategies to improve insulin resistance and metabolic health in obese individuals.Adipose tissue is a complex organ with diverse functions, including energy storage, metabolic regulation, and immune functions. It contains various immune cells, such as macrophages and T cells, making it a key player in both metabolism and immunity. Obesity and lipodystrophy disrupt adipose tissue function, leading to changes in cytokine, chemokine, and hormone expression, as well as immune cell composition. These changes contribute to systemic inflammation and insulin resistance. This review discusses how adipose-resident immune cells regulate inflammation and insulin resistance through cytokine and chemokine secretion, highlighting major research questions in the field. Obesity is a proinflammatory condition, with adipose tissue and immune cells contributing to increased levels of proinflammatory cytokines. Chronic low-grade systemic inflammation, termed "metabolic inflammation," is a key factor in the development of insulin resistance and type 2 diabetes. Adipose tissue, particularly white adipose tissue (WAT), is the main site of systemic inflammation in obesity. Adipokines, such as TNF-α, IL-6, leptin, adiponectin, and resistin, play critical roles in insulin resistance. These adipokines can have proinflammatory or anti-inflammatory effects, influencing insulin signaling and glucose metabolism. TNF-α is a potent proinflammatory cytokine secreted by adipose tissue macrophages, contributing to insulin resistance. IL-6 is a multifaceted cytokine involved in inflammation, immune responses, and metabolism. It is secreted by WAT and can influence insulin resistance. Leptin, secreted by adipocytes, regulates energy balance and metabolism but is often resistant in obesity, leading to reduced lipid oxidation and insulin resistance. Adiponectin, an anti-inflammatory adipokine, improves insulin sensitivity and is reduced in obesity. Resistin, secreted by adipocytes, can interfere with insulin signaling and promote inflammation. IL-7, a cytokine supporting T cell survival, is also secreted by adipose tissue and contributes to body weight regulation. Adipose tissue remodeling in obesity involves changes in immune cell composition, with a shift from anti-inflammatory M2 macrophages to proinflammatory M1 macrophages. Myeloid-derived suppressor cells (MDSCs) play a role in insulin sensitivity and may be involved in the development of insulin resistance. Understanding the complex interactions between adipose tissue, immune cells, and adipokines is crucial for developing therapeutic strategies to improve insulin resistance and metabolic health in obese individuals.
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Understanding Adipose Tissue in Obesity-Related Inflammation and Insulin Resistance%3A Cells%2C Cytokines%2C and Chemokines