Abstract
Hepatocyte growth factor (HGF) induces a three-phase response leading to the formation of branched tubular structures in epithelial cells1,2. The HGF receptor tyrosine kinase works through a Src homology (SH2) docking site that can activate several signalling pathways3. The first phase of the response (scattering), which results from cytoskeletal reorganization, loss of intercellular junctions and cell migration4, is dependent on phosphatidylinositol-3-OH kinase and Rac activation5,6. The second phase (growth) requires stimulation of the Ras–MAP kinase cascade7. Here we show that the third phase (tubulogenesis) is dependent on the STAT pathway. HGF stimulates recruitment of Stat-3 to the receptor, tyrosine phosphorylation, nuclear translocation and binding to the specific promoter element SIE. Electroporation of a tyrosine-phosphorylated peptide, which interferes with both the association of STAT to the receptor and STAT dimerization, inhibits tubule formation in vitro without affecting either HGF-induced ‘scattering’ or growth. The same result is obtained using a specific ‘decoy’ oligonucleotide that prevents STAT from binding to DNA and affecting the expression of genes involved in cell-cycle regulation (c-fos and waf-1). Activation of signal transducers that directly control transcription is therefore required for morphogenesis.
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Acknowledgements
We thank P. Giordano (Pharmacia & Upjohn) for peptide synthesis; C. Ponzetto for discussions; A. Cignetto for secretarial help; and E. Wright for help with the manuscript. This work was supported by an AIRC grant to P.M.C. M.A. is recipient of a FIRC Fellowship.
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Boccaccio, C., Andò, M., Tamagnone, L. et al. Induction of epithelial tubules by growth factor HGF depends on the STAT pathway. Nature 391, 285–288 (1998). https://doi.org/10.1038/34657
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DOI: https://doi.org/10.1038/34657
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