Project description:JorA might inhibit the proliferation, migration and promote apoptosis of GC cells AGS by down-regulating the expression of target LGR5 and β-catenin, and then regulating the LGR5/Wnt/β-catenin signaling pathway.
Project description:Gastric cancer is a global health concern. Molecular alterations in various signaling pathways have been implicated in the development and late-stage progression/metastasis of gastric cancer. Reports have suggested that Wnt signaling pathway might contribute to gastric carcinogenesis by stimulating migration and invasion of gastric cancer cells. This study aimed at analysing the proteome change upon CAMKK2 inhibition in gastric cancer cells using LC-MS/MS based quantitative proteomic approach. A TMT based quantitative approach was used to identify the significantly altered proteins upon CAMKK2 inhibition. Gene Ontology (GO) analysis and pathway analysis was done for the significantly altered proteins and was later validated by immunoblotting.
Project description:We hypothesized that DKK3 may exert oncogenic function supecifically in head and neck squamous cell carcinoma (HNSCC). DKK3 overexpression in HNSCC cell resulted in elevated cellular proliferation, migration, invasion and in vivo tumor growth. This elevated malignant properties was not driven by Wnt/beta-catenin pathway.
Project description:The Wnt pathway is a key regulator of embryonic development, cell growth, differentiation, polarity formation, neural development, carcinogenesis, and stem cell self-renewal, and deregulation of the Wnt signalling is associated with many human disease. The central player in the Wnt pathway is β-catenin, A recent study has shown that β-catenin/Tcf/Lef signaling pathway is an essential growth-regulatory pathway in cardiomyocytes. We used DNA microarrays to detail the global trends in gene expression underlying β-catenin-overexpressed cardiomyocytes and identified distinct classes of up- or down-regulated genes during this process. Our findings suggest that β-catenin plays a critical role in regulating cardiac dysfunction at transcriptional level and may provide novel insight into how β-catenin modulates heart diseases. Cardiomyocytes were infected with GFP control or β-catenin adenoviruses for RNA extraction and hybridization on Affymetrix microarrays. We sought to define the effects of β-catenin on the global programme of gene expression in primary cardiomyocytes. To that end, neonatal rat cardiomyocytes were infected with GFP control (G) or β-catenin adenovirus (B) for 24 hours.
Project description:Progastrin is a pro-hormone that, in physiological conditions, is maturated in gastrin in G cells of the stomach. The role of the gastrin is to stimulate the secretion of gastric acids during digestion. It is also important for the regulation of cell growth of the gastric mucosal.
In a healthy person, progastrin is not detectable in the peripheral blood. However, progastrin is abnormally released in the blood of patients with different cancers (colorectal, gastric, ovarian, breast, cervix uterus, melanoma...) The gene GAST coding for progastrin is a direct target gene of the WNT/ß-catenin oncogenic pathway. The activation of this oncogenic pathway is an early event in cancer development.
Chronic activation of the WNT/ß-catenin oncogenic pathway occurs in almost all human solid tumors and is a central mechanism in cancer biology that induces cellular proliferation, blocking of differentiation leading to primary tumor growth and metastasis formation.
Progastrin measured in the peripheral blood of patients on treatments, could be a new powerful marker for diagnosis and prognosis at different stages.
Project description:The Wnt pathway is a key regulator of embryonic development, cell growth, differentiation, polarity formation, neural development, carcinogenesis, and stem cell self-renewal, and deregulation of the Wnt signalling is associated with many human disease. The central player in the Wnt pathway is β-catenin, A recent study has shown that β-catenin/Tcf/Lef signaling pathway is an essential growth-regulatory pathway in cardiomyocytes. We used DNA microarrays to detail the global trends in gene expression underlying β-catenin-overexpressed cardiomyocytes and identified distinct classes of up- or down-regulated genes during this process. Our findings suggest that β-catenin plays a critical role in regulating cardiac dysfunction at transcriptional level and may provide novel insight into how β-catenin modulates heart diseases.
Project description:Because of its insensitivity to existing radiotherapy, namely chemotherapy and targeted treatments, triple-negative breast cancer (TNBC) remains a great challenge to overcome. Increasing evidence has indicated abnormal Wnt/β-catenin pathway activation in TNBC but not luminal or HER2+ breast cancer, and lncRNAs play a key role in a variety of cancers. Through lncRNA microarray profiling between activated and inactivated wnt/β-catenin pathway of TNBC tissues, lnc-WAL (wnt/β-catenin associated lncRNA; WAL) was selected as the top upregulated lncRNA in wnt/β-catenin pathway activation compared with the inactivation group. RIP-seq was used to compare the β-catenin and IgG groups, where lnc-WAL could interact with β-catenin. Clinically, increased lnc-WAL in TNBC tumor tissue was associated with shorter survival. lnc-WAL promoted EMT, the proliferation, migration and invasion of breast cancer stem cells (BCSCs), and TNBC cells. Mechanistically, lnc-WAL inhibited β-catenin protein degradation via Axin-mediated phosphorylation at serine 45. Subsequently, β-catenin accumulated in the nucleus and activated the target genes. Importantly, wnt/β-catenin pathway activation stimulated the transcription of lnc-WAL. These results pointed to a master regulatory role of lnc-WAL/Axin/β-catenin in the malignant progression of TNBC. Our findings provide important clinical translational evidence that lnc-WAL may be a potential therapeutic target against TNBC.
Project description:We have employed whole genome microarray expression profiling as a discovery platform to identify genes with the potential to distinguish between the gastric cancer and adjacent nontumor tissue. The human gastric cancer tissue belonging to low-differentiated adenocarcinoma and adjacent nontumor tissue were analysed. Expression of TIPE1 and Wnt family from this signature was quantified in the same kind of samples by real-time PCR, confirming the change pattern.
Project description:The Notch signaling pathway regulates fate decision, proliferation and differentiation of intestinal epithelial cells. However, the role of Notch signaling in colorectal cancer progression is largely unknown. Here we show that Notch signaling suppresses the progression of colorectal tumorigenesis, even though it augments tumor initiation. In contrast to adenomas of Apcmin mice, Notch-inactivated Apcmin adenomas showed more malignant characteristics, such as submucosal invasion and loss of glandular pattern. Conversely, Notch-activated Apcmin adenomas showed a reversion from high-grade to low-grade features, such as the restoration of adherent junctions. Expression profiling revealed that Notch signaling promotes the differentiation of tumor cells with down regulation of Wnt/beta-catenin target genes and inhibition of epithelial-mesenchymal transition. Comparison of mouse and human expression profiles also suggests the common role of Notch in inhibition of tumor progression. Interestingly, Notch signaling suppressed the expression of beta-catenin responsive genes through chromatin modification of Tcf4/beta-catenin binding sides. Our results suggest that Notch signaling has dual roles in colorectal tumorigenesis: promoting adenoma initiation, while inhibiting tumor progression to colorectal cancer. mRNAs from normal (WT, Notch-activated and Notch-inactivated) and tumor (WT, Notch-activated and Notch-inactivated) tissues were profiled.
Project description:Knock-down or overexpression of LAP2beta regulated migration and invasion of gastric cancer cells in vivo and in vitro studies. To investigate the underlying mechanism for LAP2beta-regulated migration and invasion, we compared the gene expression changes between the mock cells and the stable cells. Total RNA was purified from the mock cells and the stable cells overexpressing LAP2beta