Insulin-like growth factor 2 (IGF2)
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IGF2 Structure, Expression, and Genetic Imprinting
Insulin-like growth factor 2 (IGF2) is a protein hormone closely related to insulin and IGF1, sharing significant sequence homology and structural similarities. The IGF2 gene is subject to parental imprinting, meaning it is primarily expressed from the paternal allele in both humans and mice. This imprinting is crucial for normal growth regulation, and disruptions can lead to various growth disorders and diseases, such as Beckwith-Wiedemann and Silver-Russell syndromes, which are characterized by abnormal growth patterns and tumor susceptibility 128.
IGF2 in Growth, Development, and Metabolism
IGF2 plays a central role in fetal development, regulating cell proliferation, differentiation, and survival. It is highly expressed during embryogenesis and is essential for normal tissue and organ growth. In adults, IGF2 continues to influence metabolic processes and is involved in maintaining tissue homeostasis and regeneration, particularly through its effects on stem cell activity and self-renewal 2478. The liver is the main endocrine source of IGF2, but it also acts locally in many tissues through autocrine and paracrine mechanisms .
IGF2 and Disease: Cancer, Fibrosis, and Cardiovascular Disorders
Cancer and Tumorigenesis
IGF2 is frequently overexpressed in various cancers, including childhood and adult malignancies such as Wilms' tumor, breast, colon, and lung cancers. Its overexpression is linked to increased cell proliferation, resistance to apoptosis, and tumor progression. IGF2 also contributes to cancer metastasis and helps tumors evade immune surveillance, making it a factor in poor prognosis and resistance to chemotherapy. Loss of imprinting of the IGF2 gene is a common feature in several cancers and overgrowth syndromes 1289.
Fibrosis
IGF2 is implicated in the development of fibrotic diseases, where it promotes fibroblast proliferation and excessive extracellular matrix production. This leads to tissue scarring and organ dysfunction in conditions affecting the skin, oral cavity, heart, lung, liver, and kidneys .
Cardiovascular Disease
There is evidence that IGF2 influences the size of atherosclerotic lesions, suggesting a role in cardiovascular disease, although the mechanisms are less well understood compared to its role in growth and cancer .
IGF2 in the Central Nervous System and Cognitive Function
Recent research highlights the importance of IGF2 in the adult central nervous system, particularly in memory consolidation and cognitive function. IGF2 is highly expressed in the brain and interacts with specific receptors to support hippocampus-dependent memory. Alterations in IGF2 expression are observed in various psychiatric and neurological disorders, including schizophrenia, depression, Alzheimer's disease, and post-traumatic stress disorder. IGF2 is being explored as a potential therapeutic target for cognitive impairments and memory dysfunctions 456.
IGF2 Receptors, Binding Proteins, and Secretion
IGF2 exerts its effects through several receptors, mainly the type 1 IGF receptor (IGF1R) and the insulin receptor isoform A (IR-A), which mediate its growth-promoting and anti-apoptotic actions. The type 2 IGF receptor (IGF2R) is primarily involved in IGF2 degradation and may also play a role in memory processes. IGF2 activity is further regulated by binding proteins that localize and modulate its interaction with receptors. Recent studies have identified TMED10 as a key protein in the secretion of IGF2, facilitating its export from the endoplasmic reticulum and Golgi apparatus, which is essential for its function in myoblast differentiation and possibly other tissues 2610.
Conclusion
IGF2 is a multifunctional growth factor with critical roles in embryonic development, adult tissue maintenance, metabolism, and disease. Its dysregulation is linked to a range of disorders, including cancer, fibrosis, cardiovascular disease, and cognitive dysfunction. Ongoing research continues to uncover new functions and regulatory mechanisms of IGF2, highlighting its potential as a therapeutic target in multiple fields 1234+5 MORE.
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