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Resistin: Hormone, Function and Metabolic Role
Resistin is a hormone produced by fat tissue that can promote insulin resistance and influence inflammatory processes. It plays a role in metabolic diseases such as type 2 diabetes.
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Resistin is a hormone produced by fat tissue that can promote insulin resistance and influence inflammatory processes. It plays a role in metabolic diseases such as type 2 diabetes.
What is Resistin?
Resistin is a protein hormone primarily produced by fat cells (adipocytes). Its name is derived from the phrase resistance to insulin. Resistin belongs to a group of signaling molecules known as adipokines – hormones secreted by fat tissue that exert wide-ranging effects throughout the body. In humans, resistin is also produced by immune cells called macrophages, which distinguishes human resistin biology from that of rodents.
Mechanism of Action
Resistin acts on multiple tissues and influences metabolism in several ways:
- Insulin resistance: Resistin impairs the ability of insulin to facilitate glucose uptake in the liver, muscle, and fat tissue, leading to elevated blood sugar levels.
- Pro-inflammatory effects: Resistin activates inflammatory signaling pathways and stimulates the production of inflammatory cytokines such as TNF-alpha and interleukin-6.
- Lipid metabolism: Resistin can inhibit fat breakdown and promote fat storage in the body.
Medical Significance
Association with Metabolic Diseases
Elevated resistin levels in the blood have been associated with several conditions:
- Type 2 diabetes mellitus: High resistin concentrations can reduce insulin sensitivity and contribute to the development of type 2 diabetes.
- Metabolic syndrome: In overweight and obese individuals, resistin levels are often elevated, increasing the risk of cardiovascular disease.
- Atherosclerosis: Resistin promotes inflammatory changes in blood vessels, contributing to the development of arterial plaque (hardening of the arteries).
- Non-alcoholic fatty liver disease (NAFLD): Resistin has also been linked to the onset and progression of fatty liver disease.
Resistin and Inflammatory Conditions
Since human resistin is primarily produced by macrophages, it plays an important role in inflammatory diseases. Elevated resistin levels have been found in patients with rheumatoid arthritis, inflammatory bowel disease, and other chronic inflammatory conditions.
Resistin Compared to Other Adipokines
Adipokines are hormones secreted by fat tissue and include resistin, leptin, adiponectin, and visfatin. While leptin primarily regulates appetite and adiponectin has anti-inflammatory properties, resistin tends to promote inflammation and metabolic dysfunction. An imbalance of these hormones – often driven by excess body weight – can increase the risk of chronic disease.
Diagnosis and Measurement
Resistin can be measured in blood serum. Elevated levels may indicate underlying inflammation or metabolic risk. However, resistin testing is not yet a routine clinical parameter and is mainly used in research settings. Reference values may vary depending on the laboratory.
Factors Affecting Resistin Levels
Several factors influence resistin levels in the blood:
- Body weight: Overweight and obesity are associated with higher resistin levels.
- Diet: A high-fat, pro-inflammatory diet can increase resistin secretion.
- Physical activity: Regular exercise may help reduce resistin levels.
- Chronic inflammation: Inflammatory diseases increase resistin production by macrophages.
- Medications: Certain antidiabetic drugs such as thiazolidinediones (e.g., pioglitazone) may lower resistin levels.
References
- Steppan C. M. et al. - The hormone resistin links obesity to diabetes. Nature. 2001;409(6818):307-312.
- Filkova M. et al. - The role of resistin as a regulator of inflammation: implications for various human pathologies. Clinical Immunology. 2009;133(2):157-170.
- Schwartz D. R., Lazar M. A. - Human resistin: found in translation from mouse to man. Trends in Endocrinology and Metabolism. 2011;22(7):259-265.
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