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Trafficking of nuclear heparin-binding epidermal growth factor-like growth factor into an epidermal growth factor receptor-dependent autocrine loop in response to oxidative stress



Trafficking of nuclear heparin-binding epidermal growth factor-like growth factor into an epidermal growth factor receptor-dependent autocrine loop in response to oxidative stress



Cancer Research 65(18): 8242-8249



Heparin-binding epidermal growth factor (EGF)-like growth factor (HB-EGF) accumulates in the nucleus in aggressive transitional cell carcinoma (TCC) cells and this histologic feature is a marker of poor prognosis in human bladder cancer tissues. Here we report that HB-EGF can be exported from the nucleus during stimulated processing and secretion of the growth factor. Production of reactive oxygen species (ROS) resulted in mobilization of the HB-EGF precursor, proHB-EGF, from the nucleus of TCCSUP bladder cancer cells to a detergent-resistant membrane compartment, where the growth factor was cleaved by a metalloproteinase-mediated mechanism and shed into the extracellular space. Inhibition of nuclear export suppressed HB-EGF shedding. Production of ROS resulted in EGF receptor (EGFR) and Akt1 phosphorylation in HB-EGF-expressing cells. HB-EGF also stimulated cell proliferation and conferred cytoprotection when cells were challenged with cisplatin. These findings show that the nucleus can serve as an intracellular reservoir for a secreted EGFR ligand and, thus, can contribute to an autocrine loop leading to cell proliferation and protection from apoptotic stimuli.

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Accession: 012701812

Download citation: RISBibTeXText

PMID: 16166300

DOI: 10.1158/0008-5472.can-05-0942


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