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Adipose Tissue Hormones (Adipokines) – Function & Role

Adipose tissue hormones are signaling molecules produced by fat cells that regulate metabolism, appetite, and immune function throughout the body.

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Things worth knowing about "Adipose Tissue Hormones"

Adipose tissue hormones are signaling molecules produced by fat cells that regulate metabolism, appetite, and immune function throughout the body.

What Are Adipose Tissue Hormones?

Adipose tissue hormones, commonly known as adipokines, are hormone-like signaling molecules secreted by fat cells (adipocytes). For a long time, adipose tissue was considered merely a passive energy storage depot. It is now recognized as an active endocrine organ that releases a wide range of bioactive molecules capable of influencing numerous physiological processes throughout the body.

Adipokines act on the brain, liver, skeletal muscles, cardiovascular system, and immune system. They play a central role in regulating appetite, energy balance, insulin sensitivity, and inflammatory responses.

Key Adipose Tissue Hormones

Leptin

Leptin is one of the most well-known adipokines. It is secreted in proportion to fat mass and signals to the brain, particularly the hypothalamus, that sufficient energy reserves are available. Leptin suppresses appetite and promotes energy expenditure. In individuals with obesity, a condition known as leptin resistance can develop, in which the brain no longer responds adequately to elevated leptin levels.

Adiponectin

Adiponectin has anti-inflammatory and insulin-sensitizing properties. It enhances the sensitivity of cells to insulin and helps protect blood vessels from damage. Notably, adiponectin levels decrease as body weight increases, and low levels are associated with an elevated risk of type 2 diabetes and cardiovascular disease.

Resistin

Resistin was originally discovered in the context of insulin resistance. It promotes inflammatory processes and inhibits insulin action. Elevated resistin levels have been linked to type 2 diabetes, atherosclerosis, and other metabolic disorders.

Visfatin

Visfatin (also known as NAMPT or PBEF) is produced primarily by visceral adipose tissue (abdominal fat). It has insulin-like properties and is involved in inflammatory and immune responses. Elevated visfatin levels are observed in individuals with obesity and metabolic syndrome.

Chemerin

Chemerin regulates the differentiation of fat cells and influences immune cell function. Elevated chemerin levels are associated with obesity, high blood pressure, and metabolic syndrome.

Relevance to Health

The balance of adipose tissue hormones is critical for maintaining a healthy metabolism. An imbalance, as commonly seen in obesity, can contribute to a range of serious conditions:

Type 2 diabetes mellitus
Cardiovascular disease
Chronic low-grade inflammation
Metabolic syndrome
Non-alcoholic fatty liver disease (NAFLD)

Factors That Influence Adipokine Levels

Several lifestyle factors affect the production and activity of adipokines:

Body weight: Excess weight, particularly visceral fat, shifts the adipokine profile in an unfavorable direction.
Physical activity: Regular exercise improves the adipokine profile by increasing adiponectin levels and restoring leptin sensitivity.
Diet: A balanced, anti-inflammatory diet (e.g., Mediterranean diet) has a positive effect on adipokine regulation.
Sleep: Sleep deprivation can reduce leptin production and increase appetite.

Diagnosis and Clinical Relevance

Measuring adipokines, particularly leptin and adiponectin, can be clinically useful for assessing the risk of metabolic diseases. However, these laboratory values are not yet routinely determined in general practice and are more commonly used in specialized diagnostics and research settings.

References

Fasshauer M, Bluher M. Adipokines in health and disease. Trends in Pharmacological Sciences, 2015; 36(7): 461-470.
World Health Organization (WHO). Obesity and Overweight. Fact Sheet, 2024. Available at: https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight
Scherer PE. Adipose tissue: from lipid storage compartment to endocrine organ. Diabetes, 2006; 55(6): 1537-1545.

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