TY - JOUR
T1 - Differential and epigenetic gene expression profiling identifies frequent disruption of the RELN pathway in pancreatic cancers
AU - Sato, Norihiro
AU - Fukushima, Noriyoshi
AU - Chang, Rubens
AU - Matsubayashi, Hiroyuki
AU - Goggins, Michael
N1 - Funding Information:
Supported by National Cancer Institute grants CA90709 and CA62924, the Michael Rolfe Foundation, and the National Pancreas Foundation.
PY - 2006/2
Y1 - 2006/2
N2 - Background & Aims: Recently described genome-wide approaches robustly detect many candidate genes that are regulated by DNA methylation, but many of these genes do not represent important targets for functional inactivation. Here we used a microarray-based strategy to identify biologically relevant genes associated with epigenetic silencing in pancreatic cancer. Methods: We compared information from differential gene expression analysis with the transcriptional responses to epigenetic modifiers. Results: Using this approach, we identified 7 novel targets for aberrant methylation in pancreatic cancer. One of the genes identified, RELN (Reelin), a key regulator of neuronal migration, is frequently silenced in pancreatic cancers, as are several of its downstream mediators. Importantly, small interfering RNA-mediated knockdown of RELN in pancreatic cancer cells that retain RELN expression resulted in greatly enhanced cell motility, invasiveness, and colony-forming ability. Increased cell motility was also induced by knockdown of downstream components of the RELN pathway, including ApoER2, VLDLR, and DAB1. Treatment of pancreatic cancer cells with histone deacetylase inhibitors, valproic acid and suberoylanilide hydroxamic acid, restored the expression of RELN and DAB1 and markedly inhibited their migration. Conclusions: The high prevalence of the silencing of RELN pathway components and its reversal by histone deacetylase inhibitors suggest the importance of this pathway as a diagnostic and therapeutic target for pancreatic cancer.
AB - Background & Aims: Recently described genome-wide approaches robustly detect many candidate genes that are regulated by DNA methylation, but many of these genes do not represent important targets for functional inactivation. Here we used a microarray-based strategy to identify biologically relevant genes associated with epigenetic silencing in pancreatic cancer. Methods: We compared information from differential gene expression analysis with the transcriptional responses to epigenetic modifiers. Results: Using this approach, we identified 7 novel targets for aberrant methylation in pancreatic cancer. One of the genes identified, RELN (Reelin), a key regulator of neuronal migration, is frequently silenced in pancreatic cancers, as are several of its downstream mediators. Importantly, small interfering RNA-mediated knockdown of RELN in pancreatic cancer cells that retain RELN expression resulted in greatly enhanced cell motility, invasiveness, and colony-forming ability. Increased cell motility was also induced by knockdown of downstream components of the RELN pathway, including ApoER2, VLDLR, and DAB1. Treatment of pancreatic cancer cells with histone deacetylase inhibitors, valproic acid and suberoylanilide hydroxamic acid, restored the expression of RELN and DAB1 and markedly inhibited their migration. Conclusions: The high prevalence of the silencing of RELN pathway components and its reversal by histone deacetylase inhibitors suggest the importance of this pathway as a diagnostic and therapeutic target for pancreatic cancer.
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U2 - 10.1053/j.gastro.2005.11.008
DO - 10.1053/j.gastro.2005.11.008
M3 - Article
C2 - 16472607
AN - SCOPUS:32044467674
SN - 0016-5085
VL - 130
SP - 548
EP - 565
JO - Gastroenterology
JF - Gastroenterology
IS - 2
ER -