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Pancreatic STAT5 activation promotes KrasG12D- and inflammation- induced acinar-to-ductal metaplasia and pancreatic cancer

ABSTRACT: Pancreatic STAT5 activation promotes KrasG12D- and inflammation- induced acinar-to-ductal metaplasia and pancreatic cancer

PROVIDER: PRJNA1069765 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR27747460.fastq.gz	Fastqsanger.gz
	SRR27747461.fastq.gz	Fastqsanger.gz
	SRR27747462.fastq.gz	Fastqsanger.gz
	SRR27747463.fastq.gz	Fastqsanger.gz
	SRR27747464.fastq.gz	Fastqsanger.gz

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Pancreatic STAT5 activation promotes KrasG12D- and inflammation- induced acinar-to-ductal metaplasia and pancreatic cancer

Project description:Pancreatic ductal adenocarcinoma (PDAC) remains a highly lethal malignancy due to its predilection for late-stage presentation. Signal transducer and activator of transcription 5 (STAT5) is a transcription factor implicated in the progression of various cancer types. However, its functional role in KRAS-driven pancreatic tumorigenesis remains unclear. We found that high levels of STAT5 in tumor cells were associated with a poorer prognosis in patients. The loss of Stat5 in acinar cells significantly reduced the development of acinar-to-ductal metaplasia (ADM) and PDAC lesions driven by KRAS mutation and pancreatitis. IL-22 signaling, induced by chronic inflammation, enhanced KRAS-mutant mediated STAT5 phosphorylation and the tumor-promoting function of IL-22 depends on the activation of STAT5. Chromatin immunoprecipitation assays revealed that STAT5 was directly bound to the promoters of ADM mediators HNF4a.

2025-01-25 | GSE254340 | GEO

mTORC1 and mTORC2 converge on the Arp2/3 complex to promote KrasG12D-induced acinar-to-ductal metaplasia and early pancreatic carcinogenesis

Project description:Oncogenic KrasG12D, a driver mutation of pancreatic ductal adenocarcinoma (PDAC), induces neoplastic transformation of acinar cells through acinar-to-ductal metaplasia (ADM). Here, we show that both functional complexes of mTOR (mechanistic target of rapamycin kinase, mTORC1 and mTORC2) are specifically activated in ADM. Murine models uncover that mTORC1 and mTORC2 cooperate to promote KrasG12D-driven ADM development. Proteomic analyses identify Arp2/3 complex, an actin nucleator, as the common downstream effector: mTORC1 is responsible for the protein synthesis of Rac1 and Arp3 while mTORC2 promotes the Arp2/3 complex activity via Akt/Rac1 signalling. Genetic ablation of Arp2/3 complex completely arrests KrasG12D-driven ADM development. The Arp2/3 complex-mediated y-branching of actin network promotes the basolateral spread of filamentous actin, which is indispensable for acinar cells-initiated carcinogenesis. Induced by oncogenic KrasG12D, ADM is a metaplastic phenotype of acinar cells that requires extensive actin rearrangements. mTORC1 and mTORC2, downstream targets of KrasG12D, have well-established oncogenic functions in PDAC development. The actin-related protein 2/3 (Arp2/3) complex is the first identified actin nucleator. Regarded as textbook knowledge, it is activated by EGFR/Rac1 signalling to promote the polymerisation of branched actin filaments from pre-existing filaments in numerous biological contexts. Hereby, we identify that mTORC1 and mTORC2 attain a dual, yet non-redundant, regulatory role in promoting Arp2/3 complex function, which is responsible for generating basolateral filamentous actin in ADM. Thus, the role of Arp2/3 complex fills up the missing gap between putative oncogenic signals and actin dynamics underlying PDAC initiation.

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Project description:To investigate the underlying changes during acinar-to-ductal metaplasia induced by different factos, pancreatic acinar cells were isolated from 5 week old wt, KrasG12D, Pi3kCAH1047R and Mek1dd mice. Acinar cells from wt mice were treated with medium (control), Tgfa or IL17a. RNA was isolated immediately after isolation (t=0 days) or after 2-3 days embedded in collagen.

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Transcriptional Profile Of Human Pancreatic Acinar Ductal Metaplasia

Project description:Aberrant acinar to ductal metaplasia (ADM), one of the earliest events involved in exocrine pancreatic cancer development, is typically studied using pancreata from transgenic mouse models. We used primary, human pancreatic acinar cells to evaluate the transcriptional profile during the course of ADM.

2022-06-01 | GSE179248 | GEO

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