Elevation Of Growth Hormone (GH) And Prolactin Receptors ... - PubMed

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Abstract

The effect of elevated serum ovine GH (oGH) concentration on liver somatotrophic and lactogenic receptors was studied in transgenic mice expressing a metallothionein 1(MT)-oGH fusion gene. The mice belonged to three different pedigrees and were killed between 14 and 63 weeks of age. The levels of GH receptor (GH-R) and PRL receptor (PRL-R) determined by competitive binding assays were similar to those observed in late pregnant, nontransgenic mice. This observation was made for all transgenic mice expressing elevated serum oGH levels, irrespective of sex, final size, or age. Cross-linking studies revealed that binding occurred predominantly to a Mr 48,000 polypeptide with a small amount of binding to polypeptides of Mr 60,000, 70,000, and 100,000 in transgenic mice as well as in a late pregnant, nontransgenic mouse. Total cellular RNA was isolated from livers of transgenic and nontransgenic mice and analyzed on Northern blots using probes specific for GH-R and PRL-R. Results showed that the levels of messenger RNA for both GH-R and PRL-R were elevated in transgenic mice expressing high levels of serum oGH. Since levels of PRL in these mice were within the normal range, these results demonstrate that oGH is capable of inducing hepatic GH-R and PRL-R in vivo and that PRL is not required for the induction of its own receptor. These data also demonstrate, for the first time, the suitability of transgenic mice expressing a foreign GH for the study of the regulation of hepatic GH and PRL receptors.

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