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DDR1 knockdown in BXPC3 cell line

ABSTRACT: Examination of effect of stable DDR1 knockdown by shRNA on transcriptional profile in BXPC3 cell line to understand role of DDR1 in tumorigenesis.

ORGANISM(S): Homo sapiens

PROVIDER: GSE39207 | GEO | 2014/05/01

SECONDARY ACCESSION(S): PRJNA170202

REPOSITORIES: GEO

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DDR1 knockdown in BXPC3 cell line

Project description:Examination of effect of stable DDR1 knockdown by shRNA on transcriptional profile in BXPC3 cell line to understand role of DDR1 in tumorigenesis. Transcriptional profiles of parental BXPC3 cell line was compared to BXPC3 cells stably transfected with non-target shRNA or DDR1 shRNA, N=3 for each condition.

2014-05-01 | E-GEOD-39207 | biostudies-arrayexpress

DDR1 knockdown in BXPC3 cell line

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Project description:Pancreatic ductal adenocarcinoma (PDAC) is a highly desmoplastic, aggressive cancer, frequently progressing and spreading by liver metastasis. Cancer-associated fibroblasts (CAF), extracellular matrix (ECM), and type I collagen (Col I) support or restrain PDAC progression and may impede blood supply and nutrient availability. The dichotomous role of the stroma in PDAC, and the mechanisms through which it influences patient survival and enables desmoplastic cancers to escape nutrient limitation remain poorly understood. Here we show that matrix metalloprotease (MMP)-cleaved or intact Col I (cCol I and iCol I, respectively) exert opposing effects on PDAC bioenergetics, macropinocytosis (MP), tumor growth and metastasis. While cCol I activates DDR1 (discoidin domain receptor-1)-NF-kB-p62-NRF2 signaling to promote PDAC growth, iCol I triggers DDR1 degradation and restrains PDAC growth. Patients whose tumors are iCol I enriched and DDR1 and NRF2 low have improved median survival compared to those with high cCol I, DDR1 and NRF2. Inhibition of DDR1-stimulated NF-kB or mitochondrial biogenesis blocked tumorigenesis in wildtype mice but not in mice expressing MMP-resistant Col I. The diverse effects of the tumor stroma on PDAC growth, metastasis, and patient survival are mediated through the Col I-DDR1-NF-kB-NRF2-mitochondrial biogenesis pathway, presenting new therapeutic opportunities.

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Project description:Differential expression of miRNAs between parental and cisplatin-resistant PDAC cells was analyzed to elucidate the role of miRNAs in the acquired resistance of pancreatic cancer cells to cisplatin. Cisplatin-resistant BxPC3-R cells were developed from the parental BxPC3 cell line by culturing them in medium with step-wise increasing concentration of cisplatin.

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2015-08-20 | E-GEOD-70940 | biostudies-arrayexpress

Gene expression analyses of SMAD4 knockdown in pancreatic cell line

Project description:The transforming growth factor β (TGF-β) signaling protein SMAD4 is lost in 60% of PDAC, and this has been associated with poorer prognosis. We expressed SMAD4 in human PDAC cell lines BxPC3, by selection of stable clones containing an inducible SMAD4 Tet-ON construct. After 24h of SMAD4 expression, TGF-β signaling-dependent G1-arrest was observed in BxPC3 cells with an increase in the G1-phase fraction from 48.9% to 71.5%. Microarray analysis of gene expression at 8h, 24h, and 48h after SMAD4 expression characterized the regulatory impact of SMAD4 expression in a SMAD4-null PDAC cell line and identified novel targets of TGF-β signaling.

2015-08-20 | GSE70940 | GEO

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