Growth Hormone Regulatory Mechanisms in Insulin-like Growth Factor Gene Expression

Growth hormone (GH) exerts its anabolic and metabolic actions largely through the induction of insulin-like growth factor I (IGF-I) gene expression in target tissues, notably the liver. Upon GH binding to its transmembrane receptor, an intracellular cascade is initiated that culminates in the activation of key transcription factors, of which the signal transducer and activator of transcription 5b (Stat5b) is pre-eminent. Activated Stat5b translocates to the nucleus where it recognises specific DNA elements in both promoter and enhancer regions of the IGF-I locus, recruiting co-activators and remodelling chromatin to permit robust transcription. Beyond this classical pathway, emerging evidence highlights the contribution of epigenetic modifications—such as DNA methylation and histone marks—at IGF-I regulatory sites, which can fine-tune gene responsiveness to GH in a tissue-specific and developmental context. Genetic polymorphisms in the GH receptor and IGF-I promoter also modulate individual sensitivity, while long-range enhancers dispersed across the locus integrate hormonal cues to shape transcriptional output. Together, these mechanisms ensure that IGF-I levels are precisely calibrated to support somatic growth, tissue repair and metabolic homeostasis, with dysregulation implicated in growth disorders, metabolic syndromes and age-related decline.

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Growth Hormone Regulatory Mechanisms in Insulin-like Growth Factor Gene Expression publication trend

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Technical terms

Growth hormone (GH): A peptide hormone produced by the pituitary gland that stimulates growth, cell reproduction and metabolism, primarily by inducing IGF-I expression.

Insulin-like growth factor I (IGF-I): A hormone produced in response to GH that mediates many of its anabolic and growth-promoting effects on tissues.

Stat5b: A transcription factor activated by GH-triggered signalling; it binds to specific DNA motifs in the IGF-I gene to initiate transcription.

Epigenetic regulation: The modification of DNA or histone proteins—such as methylation or acetylation—that alters gene activity without changing the DNA sequence.

Promoter: A region of DNA upstream of a gene where transcription factors and RNA polymerase assemble to begin gene transcription.

References

1. Genetic and Epigenetic Modulation of Growth Hormone Sensitivity Studied With the IGF-1 Generation Test. The Journal of Clinical Endocrinology & Metabolism (2015).
2. GH/IGF-1 Signaling and Current Knowledge of Epigenetics; a Review and Considerations on Possible Therapeutic Options. International Journal of Molecular Sciences (2017).
3. Diversification of the insulin-like growth factor 1 gene in mammals. PLOS ONE (2017).
4. Mechanisms of Growth Hormone (GH) Action IDENTIFICATION OF CONSERVED Stat5 BINDING SITES THAT MEDIATE GH-INDUCED INSULIN-LIKE GROWTH FACTOR-I GENE ACTIVATION*. Journal of Biological Chemistry (2003).
5. Dispersed Chromosomal Stat5b-binding Elements Mediate Growth Hormone-activated Insulin-like Growth Factor-I Gene Transcription*. Journal of Biological Chemistry (2010).