Abstract
The infiltration, accumulation and degranulation of eosinophils in the lung represents a hallmark of active asthma. In vivo or in vitro eosinophil activation triggers the secretion of the antiapoptotic cytokine granulocyte-macrophage colony-stimulating factor (GM-CSF). We now identify Pin1, a cis-trans isomerase, as an essential component of the ribonucleoprotein complex responsible for GM-CSF mRNA stabilization, cytokine secretion and the survival of activated eosinophils. Pin1 regulated the association of the AU-rich element–binding proteins AUF1 and hnRNP C with GM-CSF mRNA, accelerating or slowing decay, respectively. These data indicate Pin1 is a key mediator of GM-CSF production.
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Acknowledgements
We thank J. Sedgwick for eosinophils; K.P. Lu (Harvard University, Boston, Massachusetts) for the Pin1 WW domain cDNA; N. Jarjour for bronchoscopy samples; P. Bertics for critical reading of the manuscript; and members of the lab and the UW-Asthma SCOR group for suggestions. Supported by the National Institutes of Health (P50HL56396 to J.S.M.).
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Supplementary Table 1
Possible Pin1 targets in AREBPs. (PDF 29 kb)
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Shen, ZJ., Esnault, S. & Malter, J. The peptidyl-prolyl isomerase Pin1 regulates the stability of granulocyte-macrophage colony-stimulating factor mRNA in activated eosinophils. Nat Immunol 6, 1280–1287 (2005). https://doi.org/10.1038/ni1266
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DOI: https://doi.org/10.1038/ni1266
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