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Pancreatic Neoplasms: HELP
Articles by Sylvain Peuget
Based on 2 articles published since 2010
(Why 2 articles?)

Between 2010 and 2020, S. Peuget wrote the following 2 articles about Pancreatic Neoplasms.
+ Citations + Abstracts
1 Article Oxidative stress induced by inactivation of TP53INP1 cooperates with KrasG12D to initiate and promote pancreatic carcinogenesis in the murine pancreas. 2013

Al Saati, Talal / Clerc, Pascal / Hanoun, Naïma / Peuget, Sylvain / Lulka, Hubert / Gigoux, Véronique / Capilla, Florence / Béluchon, Benoît / Couvelard, Anne / Selves, Janick / Buscail, Louis / Carrier, Alice / Dusetti, Nelson / Dufresne, Marlène. ·Histology Facility, INSERM-US006 ANEXPLO/CREFRE, Toulouse, France. ·Am J Pathol · Pubmed #23578383.

ABSTRACT: Tumor protein p53-induced nuclear protein 1 (TP53INP1) is involved in cell stress response. Its expression is lost at the pancreatic intraepithelial neoplasia 1b (PanIN1b)/PanIN2 stage of pancreatic carcinogenesis. Our objective was to determine whether TP53INP1 loss of expression contributes to pancreatic cancer formation in a conditional KrasG12D mouse model. We generated Kras-INP1KO mice using LSL-Kras(G12D/+);Pdx1-Cre(+/-) mice (Kras mice) and TP53INP1(-/-) mice. Analysis of pancreases during ageing shows that in the presence of activated Kras, TP53INP1 loss of expression accelerated PanIN formation and increased pancreatic injury and the number of high-grade lesions as compared with what occurs in Kras mice. Moreover, cystic lesions resembling intraductal papillary mucinous neoplasm (IPMN) were observed as early as 2 months of age. Remarkably, TP53INP1 is down-regulated in human IPMN. Activation of the small GTPase Rac1 shows that more oxidative stress is generated in Kras-INP1KO than in Kras mice pancreas despite elevated levels of the Nrf2 antioxidant regulator. We firmly establish the link between Kras-INP1KO pancreatic phenotype and oxidative stress with rescue of the phenotype by the antioxidant action of N-acetylcysteine. Our data provide in vivo functional demonstration that TP53INP1 deficiency accelerates progression of pancreatic cancer, underlining its role in the occurrence of IPMN and highlighting the importance of TP53INP1 in the control of oxidative status during development of pancreatic cancer.

2 Article TP53INP1 decreases pancreatic cancer cell migration by regulating SPARC expression. 2011

Seux, M / Peuget, S / Montero, M P / Siret, C / Rigot, V / Clerc, P / Gigoux, V / Pellegrino, E / Pouyet, L / N'Guessan, P / Garcia, S / Dufresne, M / Iovanna, J L / Carrier, A / André, F / Dusetti, N J. ·INSERM, U624 Stress cellulaire, Marseille, France. ·Oncogene · Pubmed #21339733.

ABSTRACT: Tumor protein 53 induced nuclear protein 1 (TP53INP1) is a p53 target gene that induces cell growth arrest and apoptosis by modulating p53 transcriptional activity. TP53INP1 interacts physically with p53 and is a major player in the p53-driven oxidative stress response. Previously, we demonstrated that TP53INP1 is downregulated in an early stage of pancreatic cancerogenesis and when restored is able to suppress pancreatic tumor development. TP53INP1 downregulation in pancreas is associated with an oncogenic microRNA miR-155. In the present work, we studied the effects of TP53INP1 on cell migration. We found that TP53INP1 inactivation correlates with increased cell migration both in vivo and in vitro. The impact of TP53INP1 expression on cell migration was studied in different cellular contexts: mouse embryonic fibroblast and different pancreatic cancer cell lines. Its expression decreases cell migration by the transcriptional downregulation of secreted protein acidic and rich in cysteine (SPARC). SPARC is a matrix cellular protein, which governs diverse cellular functions and has a pivotal role in regulating cell-matrix interactions, cellular proliferation and migration. SPARC was also showed to be upregulated in normal pancreas and in pancreatic intraepithelial neoplasia lesions in a pancreatic adenocarcinoma mouse model only in the TP53INP1-deficient animals. This novel TP53INP1 activity on the regulation of SPARC expression could explain in part its tumor suppressor function in pancreatic adenocarcinoma by modulating cellular spreading during the metastatic process.