Defining human insulin-like growth factor I gene regulation

Aditi Mukherjee, Damir Alzhanov, Peter Rotwein

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Growth hormone (GH) plays an essential role in controlling somatic growth and in regulating multiple physiological processes in humans and other species. Insulin-like growth factor I (IGF-I), a conserved, secreted 70-amino acid peptide, is a critical mediator of many of the biological effects of GH. Previous studies have demonstrated that GH rapidly and potently promotes IGF-I gene expression in rodents and in some other mammals through the transcription factor STAT5b, leading to accumulation of IGF-I mRNAs and production of IGF-I. Despite this progress, very little is known about how GH or other trophic factors control human IGF1 gene expression, in large part because of the absence of any cellular model systems that robustly express IGF-I. Here, we have addressed mechanisms of regulation of human IGF-I by GH after generating cells in which the IGF1 chromosomal locus has been incorporated into a mouse cell line. Using this model, we found that physiological levels of GH rapidly stimulate human IGF1 gene transcription and identify several potential transcriptional enhancers in chromatin that bind STAT5b in a GH-regulated way. Each of the putative enhancers also activates a human IGF1 gene promoter in reconstitution experiments in the presence of the GH receptor, STAT5b, and GH. Thus we have developed a novel experimental platform that now may be used to determine how human IGF1 gene expression is controlled under different physiological and pathological conditions.

Original languageEnglish (US)
Pages (from-to)E519-E529
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume311
Issue number2
DOIs
StatePublished - Aug 1 2016

Fingerprint

Insulin-Like Growth Factor I
Growth Hormone
Genes
Gene Expression
STAT5 Transcription Factor
Physiological Phenomena
Somatotropin Receptors
Chromatin
Mammals
Rodentia
Amino Acids
Cell Line
Messenger RNA
Peptides
Growth

Keywords

  • Chromatin immunoprecipitation
  • Epigenetics
  • Gene transcription
  • Growth hormone
  • Insulin-like growth factor I
  • Signal transducer and activator of transcription 5b

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Medicine(all)
  • Physiology (medical)

Cite this

Defining human insulin-like growth factor I gene regulation. / Mukherjee, Aditi; Alzhanov, Damir; Rotwein, Peter.

In: American Journal of Physiology - Endocrinology and Metabolism, Vol. 311, No. 2, 01.08.2016, p. E519-E529.

Research output: Contribution to journalArticle

Mukherjee, Aditi ; Alzhanov, Damir ; Rotwein, Peter. / Defining human insulin-like growth factor I gene regulation. In: American Journal of Physiology - Endocrinology and Metabolism. 2016 ; Vol. 311, No. 2. pp. E519-E529.
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