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IGF-1 - Growth Factor, Function & Medicine

IGF-1 (Insulin-like Growth Factor 1) is a naturally occurring hormone that regulates growth, cell regeneration, and metabolism. It is widely used as a clinical marker for growth hormone status.

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Things worth knowing about "IGF-1"

IGF-1 (Insulin-like Growth Factor 1) is a naturally occurring hormone that regulates growth, cell regeneration, and metabolism. It is widely used as a clinical marker for growth hormone status.

What is IGF-1?

IGF-1 (Insulin-like Growth Factor 1) is a protein hormone produced primarily by the liver in response to stimulation by growth hormone (GH), which is secreted by the pituitary gland. IGF-1 mediates many of the growth-promoting effects of GH and acts on nearly all tissues in the body. Its name reflects its structural similarity to insulin.

Mechanism of Action

IGF-1 binds to specific cell-surface receptors known as IGF-1 receptors, triggering a signaling cascade that regulates a wide range of cellular processes:

Stimulation of cell growth and division (proliferation)
Inhibition of programmed cell death (apoptosis)
Enhancement of protein synthesis in muscle tissue
Regulation of glucose and fat metabolism
Promotion of bone and cartilage growth, especially during childhood

In the bloodstream, most IGF-1 is bound to carrier proteins called IGF-binding proteins (IGFBPs), which regulate its availability and biological activity.

Medical Relevance

As a Laboratory Marker

Because IGF-1 levels in the blood are more stable and less pulsatile than growth hormone itself, it is used clinically as an indirect marker of growth hormone status. Elevated or reduced IGF-1 concentrations can indicate a variety of medical conditions.

Conditions Associated with Altered IGF-1 Levels

Acromegaly: Elevated IGF-1 due to excess growth hormone production in adults, leading to enlargement of the hands, feet, and facial features.
Gigantism: Elevated IGF-1 during childhood causing excessive body growth.
Growth hormone deficiency: Low IGF-1 levels, associated with delayed growth in children and metabolic disturbances in adults.
Liver disease: Since IGF-1 is predominantly produced in the liver, hepatic disorders can lower its levels.
Malnutrition: Insufficient caloric or protein intake leads to reduced IGF-1 production.

IGF-1 and Nutrition

Diet has a notable influence on IGF-1 levels. High-protein diets, particularly those rich in animal proteins, are associated with increased IGF-1 concentrations. Dairy products in particular have been linked to elevated IGF-1 in several studies. Conversely, caloric restriction and fasting lower IGF-1 levels, a topic of significant interest in longevity and aging research.

Diagnosis

IGF-1 is measured through a standard blood test. Reference ranges vary by age and sex, as IGF-1 levels peak during puberty and decline progressively with age. Results must always be interpreted within the broader clinical context, often alongside additional hormonal tests such as GH stimulation testing.

Therapeutic Use

Recombinant human IGF-1, known as mecasermin, is an approved medication for children with severe primary IGF-1 deficiency who do not respond adequately to growth hormone therapy. Its use is strictly supervised by specialist physicians.

Safety Concerns and Misuse

Due to its anabolic and growth-promoting properties, IGF-1 is sometimes misused in competitive sports and anti-aging medicine. This carries serious health risks, including an increased risk of certain cancers, hypoglycemia (low blood sugar), and cardiovascular complications. IGF-1 is listed on the World Anti-Doping Agency (WADA) prohibited substances list.

References

Laron Z. - Insulin-like growth factor 1 (IGF-1): a growth hormone. Molecular Pathology, 2001; 54(5): 311-316. PubMed.
Clemmons DR. - Metabolic actions of insulin-like growth factor-I in normal physiology and diabetes. Endocrinology and Metabolism Clinics of North America, 2012; 41(2): 425-443. PubMed.
World Health Organization (WHO) - Growth Hormone and IGF-1 in clinical diagnostics. WHO Technical Report Series, Geneva.

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