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Transcriptional effects of CTGF inhibition and gemcitabine in the KPC mouse model of pancreatic ductal adenocarcinoma

ABSTRACT: Pancreatic ductal adenocarcinoma (PDA) is characterized by abundant desmoplasia and poor tissue perfusion. These features are proposed to limit access of therapies to neoplastic cells and blunt treatment efficacy. Indeed, several agents that target the PDA microenvironment promote chemotherapy delivery and improve anti-neoplastic responses in murine models of PDA. Here, we employed the FG-3019 monoclonal antibody directed against the pleiotropic matricellular signaling molecule connective tissue growth factor (CTGF/CCN2). FG-3019 treatment increased PDA cell killing and led to a dramatic tumor response without altering gemcitabine delivery. Microarray expression profiling revealed the down-regulation by FG-3019 of several anti-apoptotic transcripts, including the master regulator Xiap, down-regulation of which has been shown to sensitize PDA to gemcitabine. Decreases in XIAP protein by FG-3019 in the presence and absence of gemcitabine were confirmed by immunoblot, while increases in XIAP protein were seen in PDA cell lines treated with recombinant CTGF. Therefore, alterations in survival cues following targeting of tumor microenvironmental factors may play an important role in treatment responses in animal models and, by extension, PDA patients. Total RNA was isolated from KPC mouse PDA tumors 9 days after initiation of treatment with IgG (n=7 biological replicates), FG-3019 (n=5), IgG + gemcitabine (n=6), or FG-3019 + gemcitabine (n=6) and hybridized to Affymetrix 430A 2.0 microarrays. CEL files were processed by GC-RMA and rescaled using median per-gene normalization in GeneSpring GX 7.3.1.

ORGANISM(S): Mus musculus  

SUBMITTER: Albrecht Neesse   Mark D Sternlicht  David A Tuveson  Kristopher K Frese  Todd W Seeley  Mark D. Sternlicht 

PROVIDER: E-GEOD-46203 | ArrayExpress | 2013-06-24



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