Cloning and in vivo expression of bovine growth hormone receptor mRNA

S. D. Hauser, M. F. McGrath, R. J. Collier, G. G. Krivi

Research output: Contribution to journalArticle

142 Scopus citations

Abstract

A cDNA for the bovine growth hormone (bGH) receptor has been cloned out of a cDNA library prepared from liver of a pregnant Holstein heifer. The cDNA clone hybridizes to a single 4.5 kb mRNA species and shares a high degree of sequence homology with growth hormone receptors cloned from other species. Utilizing the bGH receptor cDNA as a probe, a relatively high level of bGH-receptor mRNA was detected in bovine liver. In comparison to liver values, lower concentrations of bGH-receptor mRNA were detected in bovine kidney, anterior pituitary, and mammary gland. Because specific binding sites for bGH have not been convincingly demonstrated in isolated cell membranes from whole bovine mammary tissue, mammary tissue from two pregnant heifers (separate experiments) was separated into fractions enriched for epithelium, stroma, and blood components. These fractions were then probed for growth hormone receptor mRNA using solution hybridization-nuclease protection assays performed on isolated RNA. The assay results indicated that a low level of bGH-receptor mRNA is relatively evenly distributed throughout the mammary tissues of the two cows studied. In contrast, experiments using a probe to bovine insulin-like growth factor-I (IGF-I) indicate that the IGF-I mRNA is localized in the stromal/blood component of the mammary gland. These data suggest a possible paracrine mechanism for bGH action in the mammary gland.

Original languageEnglish (US)
Pages (from-to)187-200
Number of pages14
JournalMolecular and Cellular Endocrinology
Volume72
Issue number3
DOIs
StatePublished - Sep 10 1990

Keywords

  • Bovine growth hormone receptor
  • Growth hormone receptor
  • Growth hormone, bovine

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology

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