JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Lithocholic acid upregulates uPAR and cell invasiveness via MAPK and AP-1 signaling in colon cancer cells.

Cancer Letters 2010 April 2
The secondary bile acid lithocholic acid (LCA) induced expression of urokinase-type plasminogen activator receptor (uPAR) and enhanced cell invasiveness in colon cancer cells. A dominant negative mutant or a specific inhibitor of MEK-1 suppressed LCA-induced uPAR expression. Deletions and site-directed mutagenesis revealed that the AP-1 site was required for LCA-induced uPAR transcription. LCA-mediated enhanced cell invasiveness was partially abrogated by uPAR neutralizing antibody and inhibitors of both Erk-1/2 and AP-1. These results suggest that LCA induces uPAR expression via Erk-1/2 and AP-1 pathway and, in turn, stimulate invasiveness of human colon cancer cells.

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