Stabilization of granulocyte-macrophage colony-stimulating factor RNA in a human eosinophil-like cell line requires the AUUUA motifs

S. Esnault, J. A. Jarzembowski, J. S. Malter

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Human eosinophils activated by calcium ionophore produce granulocyte- macrophage colony-stimulating factor (GM-CSF). In T lymphocytes GM-CSF messenger RNA (mRNA) stability is regulated by 3' untranslated region (UTR) adenosine-uridine-rich elements (AREs). We show endogenous GM-CSF mRNA is rapidly induced in an eosinophil cell-line (AML14.3D10) after activation with ionomycin. To calculate the decay rate of GM-CSF mRNA in activated cells, eosinophils were transfected with wild-type, full-length GM-CSF mRNA or a mutant version lacking the AUUUA motifs. In unstimulated cells, wild-type GM- CSF mRNA decayed with a half-life time (t(1/2)) of 6 ± 2 min while the mutant decayed with a t(1/)2 of 20 ± 4 min, demonstrating the dominant, destabilizing effect of multiple AUUUA motifs. Within 1 hr of activation by ionomycin, the half-life of transfected wild-type mRNA increased by 2.5- fold, which increased up to 4-fold after 2 hr of activation. The half-life of the mutant GM-CSF was unaffected by ionomycin, demonstrating that ionophore- mediated stabilization requires intact AUUUA motifs. Actinomycin D (ActD) stabilized wild-type GM-CSF mRNA as well, causing poly(A) tail elongation and translation inhibition. These data show that in eosinophil-like cell lines, GM-CSF mRNA is exquisitely unstable but can be markedly stabilized by calcium ionophore. Both effects require intact 3' UTR AREs.

Original languageEnglish (US)
Pages (from-to)575-584
Number of pages10
JournalProceedings of the Association of American Physicians
Issue number6
Publication statusPublished - 1998



  • Ionophore
  • MRNA stability

ASJC Scopus subject areas

  • Medicine(all)

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