Polycomb repressor complex 1 promotes gene silencing through H2AK119 mono-ubiquitination in acinar-to-ductal metaplasia and pancreatic cancer cells.
Acinar-to-ductal metaplasia (ADM) occurring in cerulein-mediated pancreatitis or in oncogenic Kras-driven pancreatic cancer development is accompanied by extensive changes in the transcriptional program. In this process, acinar cells shut down the expression of acinar specific differentiation genes...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2016
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| In: |
OncoTarget
Year: 2015, Volume: 7, Issue: 10, Pages: 11424-11433 |
| ISSN: | 1949-2553 |
| DOI: | 10.18632/oncotarget.6717 |
| Online Access: | Resolving-System, Volltext: https://dx.doi.org/10.18632/oncotarget.6717 Verlag, Volltext: http://www.oncotarget.com/index.php?journal=oncotarget&page=article&op=view&path[]=6717&pubmed-linkout=1 
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| Author Notes: | Simone Benitz, Ivonne Regel, Tobias Reinhard, Anna Popp, Isabell Schäffer, Susanne Raulefs, Bo Kong, Irene Esposito, Christoph W. Michalski, Jörg Kleeff |
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| 245 | 1 | 0 | |a Polycomb repressor complex 1 promotes gene silencing through H2AK119 mono-ubiquitination in acinar-to-ductal metaplasia and pancreatic cancer cells. |c Simone Benitz, Ivonne Regel, Tobias Reinhard, Anna Popp, Isabell Schäffer, Susanne Raulefs, Bo Kong, Irene Esposito, Christoph W. Michalski, Jörg Kleeff |
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| 520 | |a Acinar-to-ductal metaplasia (ADM) occurring in cerulein-mediated pancreatitis or in oncogenic Kras-driven pancreatic cancer development is accompanied by extensive changes in the transcriptional program. In this process, acinar cells shut down the expression of acinar specific differentiation genes and re-express genes usually found in embryonic pancreatic progenitor cells. Previous studies have demonstrated that a loss of acinar-specific transcription factors sensitizes the cells towards oncogenic transformation, ultimately resulting in cancer development. However, the mechanism behind the transcriptional silencing of acinar cell fate genes in ADM and pancreatic cancer is largely unknown. Here, we analyzed whether elevated levels of the polycomb repressor complex 1 (PRC1) components Bmi1 and Ring1b and their catalyzed histone modification H2AK119ub in ADMs and tumor cells, are responsible for the mediation of acinar gene silencing. Therefore, we performed chromatin-immunoprecipitation in in vitro generated ADMs and isolated murine tumor cells against the repressive histone modifications H3K27me3 and H2AK119ub. We established that the acinar transcription factor complex Ptf1-L is epigenetically silenced in ADMs as well as in pancreatic tumor cells. For the first time, this work presents a possible mechanism of acinar gene silencing, which is an important prerequisite in the initiation and maintenance of a dedifferentiated cell state in ADMs and tumor cells. | ||
| 520 | |a differentiation gene silencing; histone mono-ubiquitination; pancreatic cancer; polycomb repressor complex | ||
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