Abstract
Despite expression of oncogenic KRAS, premalignant pancreatic intraepithelial neoplasia 1 (PanIN1) lesions rarely become fully malignant pancreatic ductal adenocarcinoma (PDAC). The molecular mechanisms through which established risk factors, such as chronic pancreatitis, acinar cell damage, and/or defective autophagy increase the likelihood of PDAC development are poorly understood. We show that accumulation of the autophagy substrate p62/SQSTM1 in stressed KrasG12D acinar cells is associated with PDAC development and maintenance of malignancy in human cells and mice. p62 accumulation promotes neoplastic progression by controlling the NRF2-mediated induction of MDM2, which acts through p53-dependent and -independent mechanisms to abrogate checkpoints that prevent conversion of differentiated acinar cells to proliferative ductal progenitors. MDM2 targeting may be useful for preventing PDAC development in high-risk individuals. Todoric et al. demonstrate that pancreatitis-induced accumulation of the autophagy substrate p62/SQSTM1 in the context of oncogenic KRAS promotes progression to pancreatic ductal adenocarcinoma. This p62 function relies on NRF2-driven induction of MDM2 and both p53 dependent and independent activity of MDM2.
Original language | English |
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Pages (from-to) | 824-839.e8 |
Journal | Cancer Cell |
Volume | 32 |
Issue number | 6 |
Early online date | 16 Nov 2017 |
DOIs | |
Publication status | Published - 11 Dec 2017 |
Keywords
- acinar cell reprogramming
- IKKα
- impaired autophagy
- MDM2
- NRF2
- p62
- pancreatic ductal adenocarcinoma
ASJC Scopus subject areas
- Oncology
- Cell Biology
- Cancer Research