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. 1986 Dec;83(24):9343–9347. doi: 10.1073/pnas.83.24.9343

Regulation of insulin-like growth factor I gene expression by growth hormone.

L S Mathews, G Norstedt, R D Palmiter
PMCID: PMC387134  PMID: 3467309

Abstract

Recombinant clones containing exon 3 of the insulin-like growth factor I (IGF-I) gene were isolated from a mouse genomic library. These sequences were used to generate an RNA probe, which was used in a solution hybridization assay to quantitate IGF-I mRNA in various murine tissues as a function of growth hormone status. The liver is the major site of IGF-I synthesis and the level of IGF-I mRNA is regulated about 10-fold by growth hormone in the growth hormone-deficient lit/lit mouse. Nuclear run-on assays were used to show that growth hormone regulation is manifested in part at the transcriptional level. Growth hormone also affects the size distribution of hepatic IGF-I mRNAs. Pancreas showed the highest non-hepatic expression, but every tissue analyzed contained some IGF-I mRNA. Expression was not growth hormone-dependent in most non-hepatic tissues.

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