title: Growth delay of human pancreatic cancer cells by methylase inhibitor 5-aza-2'-deoxycytidine treatment is associated with activation of the interferon signalling pathway.
abstract: Alteration of methylation status has been recognized as a possible epigenetic mechanism of selection during tumorigenesis in pancreatic cancer. This type of cancer is characterized by poor prognosis partly due to resistance to conventional drug treatments. We have used microarray technology to investigate the changes in global gene expression observed after treatment of different pancreatic cancer cell lines with the methylase inhibitor 5-aza-2'-deoxycytidine (5-aza-CdR). We have observed that this agent is able to inhibit to various degrees the growth of three pancreatic cancer cell lines. In particular, this inhibition was associated with induction of interferon (IFN)-related genes, as observed in other tumour types. Thus, expression of STAT1 seems to play a key role in the cellular response to treatment with the cytosine analogue. Moreover, we found increased p21(WAF1) and gadd45A expression to be associated with the efficacy of the treatment; this induction may correlate with activation of the IFN signalling pathway. Expression of the p16(INK) protein was also linked to the ability of cells to respond to 5-aza-CdR. Finally, genome-wide demethylation induced sensitization that significantly increased response to further treatment with various chemotherapy agents.
authors.affiliation: Cancer Research UK, Molecular Oncology Unit, Imperial College School of Medicine at Hammersmith Campus, London, UK.
authors.forename: Edoardo
authors.initials: E
authors.lastname: Missiaglia
authors.forename: Massimo
authors.initials: M
authors.lastname: Donadelli
authors.forename: Marta
authors.initials: M
authors.lastname: Palmieri
authors.forename: Tatjana
authors.initials: T
authors.lastname: Crnogorac-Jurcevic
authors.forename: Aldo
authors.initials: A
authors.lastname: Scarpa
authors.forename: Nicholas R
authors.initials: NR
authors.lastname: Lemoine
mesh_terms: D000964:Antimetabolites, Antineoplastic / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000494:pharmacology; D001374:Azacitidine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D002945:Cisplatin / Q000494:pharmacology; D019175:DNA Methylation / Q000187:drug effects; D015254:DNA Modification Methylases / Q000037:antagonists & inhibitors*; D000077209:Decitabine; D003841:Deoxycytidine / Q000031:analogs & derivatives* / Q000494:pharmacology; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D007372:Interferons / Q000378:metabolism*; D010190:Pancreatic Neoplasms / Q000188:drug therapy* / Q000201:enzymology; D015398:Signal Transduction / Q000187:drug effects*; D000093542:Gemcitabine
chemical_list: D000964:Antimetabolites, Antineoplastic; D000970:Antineoplastic Agents; D003841:Deoxycytidine; D000077209:Decitabine; D007371:Interferon-gamma; D007372:Interferons; D015254:DNA Modification Methylases; D001374:Azacitidine; D002945:Cisplatin; D000093542:Gemcitabine