SWI/SNF component ARID1A restrains pancreatic neoplasia formation

Sam C. Wang, Ibrahim Nassour, Shu Xiao, Shuyuan Zhang, Xin Luo, Jeon Lee, Lin Li, Xuxu Sun, Liem H. Nguyen, Jen Chieh Chuang, Lan Peng, Scott Daigle, Jeanne Shen, Hao Zhu

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Objective ARID1A is commonly mutated in pancreatic ductal adenocarcinoma (PDAC), but the functional effects of ARID1A mutations in the pancreas are unclear. Understanding the molecular mechanisms that drive PDAC formation may lead to novel therapies. Design Concurrent conditional Arid1a deletion and Kras activation mutations were modelled in mice. Small-interfering RNA (siRNA) and CRISPR/Cas9 were used to abrogate ARID1A in human pancreatic ductal epithelial cells. Results We found that pancreas-specific Arid1a loss in mice was sufficient to induce inflammation, pancreatic intraepithelial neoplasia (PanIN) and mucinous cysts. Concurrent Kras activation accelerated the development of cysts that resembled intraductal papillary mucinous neoplasm. Lineage-specific Arid1a deletion confirmed compartment-specific tumour-suppressive effects. Duct-specific Arid1a loss promoted dilated ducts with occasional cyst and PDAC formation. Heterozygous acinar-specific Arid1a loss resulted in accelerated PanIN and PDAC formation with worse survival. RNA-seq showed that Arid1a loss induced gene networks associated with Myc activity and protein translation. ARID1A knockdown in human pancreatic ductal epithelial cells induced increased MYC expression and protein synthesis that was abrogated with MYC knockdown. ChIP-seq against H3K27ac demonstrated an increase in activated enhancers/promoters. Conclusions Arid1a suppresses pancreatic neoplasia in a compartment-specific manner. In duct cells, this process appears to be associated with MYC-facilitated protein synthesis.

Original languageEnglish (US)
Pages (from-to)1259-1270
Number of pages12
JournalGut
Volume68
Issue number7
DOIs
StatePublished - Jul 1 2019

Keywords

  • Cancer genetics
  • Pancreatic cancer
  • Pancreatic tumours

ASJC Scopus subject areas

  • Gastroenterology

Fingerprint Dive into the research topics of 'SWI/SNF component ARID1A restrains pancreatic neoplasia formation'. Together they form a unique fingerprint.

  • Cite this

    Wang, S. C., Nassour, I., Xiao, S., Zhang, S., Luo, X., Lee, J., Li, L., Sun, X., Nguyen, L. H., Chuang, J. C., Peng, L., Daigle, S., Shen, J., & Zhu, H. (2019). SWI/SNF component ARID1A restrains pancreatic neoplasia formation. Gut, 68(7), 1259-1270. https://doi.org/10.1136/gutjnl-2017-315490