Expression and stability of insulin-like growth factor-I (IGF-I) mRNA splicing variants in the GH3 rat pituitary cell line

William L. Lowe, Martin Adamo, Derek LeRoith, Charles T. Roberts

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We have employed Northern blot analyses and solution hybridization/RNase protection assays to evaluate the presence and stability of IGF-I mRNA splicing variants in the GH3 rat pituitary cell line. All of the IGF-I mRNA size classes and IGF-I mRNAs with alternately-spliced 5′-untranslated regions and E-peptide coding regions seen in adult rat liver also were present in GH3 cells, although the proportions of the 5′ splicing variants were significantly altered. In actinomycin D-treated cells, all IGF-I mRNA splicing variants were equally stable; thus, changes in the levels of some splicing variants were not due to differential mRNA stability. Additionally, all IGF-I mRNA size classes seen on Northern blots were equally stable; this data suggests that the large IGF-I mRNA species is not a precursor of the smaller species.

Original languageEnglish (US)
Pages (from-to)1174-1179
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume162
Issue number3
DOIs
StatePublished - Aug 15 1989
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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