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Acidic fibroblast growth factor (FGF-1) signaling inhibits peroxynitrite-induced cell death during pancreatic tumorigenesis


Acidic fibroblast growth factor (FGF-1) signaling inhibits peroxynitrite-induced cell death during pancreatic tumorigenesis



Free Radical Biology and Medicine 30(9): 957-966



ISSN/ISBN: 0891-5849

PMID: 11316575

DOI: 10.1016/s0891-5849(01)00479-8

Previous immunohistochemical studies have demonstrated enhanced appearance of FGF-1 and nitrotyrosine, a footprint of reactive nitrogen species peroxynitrite (ONOO(-)), in human pancreatic adenocarcinoma. We have examined the consequences of constitutive exposure to FGF-1 in nontumorigenic rat ductal epithelial cells (ARIP). ARIP cells were transduced with either a secreted chimera of FGF-1, ARIP(FGF-1), or a control plasmid, 65 RIP(betag). These cells were evaluated for alteration in growth and morphology, responses to ONOO(-) (protein tyrosine nitration/phosphorylation), and in vivo tumor formation. ARIP(FGF-1) cells, in contrast to 65 RIP(betag), demonstrated a transformed morphology, a 2-fold increased growth rate, and enhanced protein tyrosine phosphorylation. Treatment with 150 microM ONOO(-) resulted in 86 and 7% (p <.01) death of ARIP(betag) and ARIP(FGF-1), respectively. Exposure of 65 RIP(betag) cells to ONOO(-) enhanced tyrosine phosphorylation and tyrosine nitration of several polypeptides. Cell signaling by FGF-1 enhanced both phosphorylation and nitration of tyrosine residues in target proteins modified by ONOO(-). ARIP(betag) cells failed to exhibit tumor formation in nude mice, but at d 7 in vivo cells were TUNEL and nitrotyrosine positive and FGF-1 negative. ARIP(FGF-1) cells readily formed tumor nodules, exhibiting features of pancreatic adenocarcinoma and demonstrating FGF-1-positive, nitrotyrosine-positive, and TUNEL-negative epithelium. These results suggest an interdependent role between FGF-1 and ONOO(-) during the development and progression of pancreatic adenocarcinoma.

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