Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 311, Issue 3, Pages 786-792Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2003.10.060
Keywords
pancreatic adenocarcinoma; cancer; focal adhesion kinase; FAK; gemcitabine; siRNA; RNA; interference
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Focal adhesion kinase (FAK) is an important regulator of cellular signaling, migration, apoptosis, and cell cycle progression. We tested the hypothesis that FAK is a determinant of gemcitabine chemoresistance in pancreatic adenocarcinoma cells and examined the effect of inhibiting FAK expression on gemcitabine-induced cytotoxicity in vitro and in vivo. FAK expression was quantified by Western and Northern blots. Expression of FAK was suppressed using small interfering RNA (siRNA). Gemcitabine-induced cytotoxicity was quantified and apoptosis was characterized. Akt activity was determined by in vitro kinase assay. We assessed the therapeutic applicability of FAK siRNA in a nude mouse orthotopic xenograft model. While not affecting cellular proliferation or apoptosis in the absence of gemcitabine, FAK siRNA potentiated gemcitabine-induced cytotoxicity in vitro and in vivo. FAK siRNA treatment suppressed Akt activity, which may contribute to its chemosensitizing effect. (C) 2003 Elsevier Inc. All rights reserved.
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