Quantitative Analysis of Notch mutant (Notch1&2-null, Psen1&2-null, RBPjk-null) and wild-type hair follicle transcriptomes by NGS
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE77997 | GEO | 2016/02/29
SECONDARY ACCESSION(S): PRJNA312317
REPOSITORIES: GEO
Similar Datasets
Project description:The goals of this study is to test whether NICD presence protects the RBPjk-null Hair Follicles by altering gene expression via association with other DNA binding proteins at P3, just before the conversion to TSLP-producing keratin cysts. Methods: Skin samples were embedded in OCT. Sectioned at 20μm thickness. Dehydrated in EtOH, and equilibrated to Xylene before the LCM procedure. Laser capture was performed with Arcturus Veritas. Methods: ~100 hair follicles from Notch-null, PS-null, RBPjk-null and wild-type samples were pooled into 3 biological replicates for each genotype and subjected to RNA isolation followed by RNA-Seq. Conclusions: A total of 2047 genes were differentially expressed (�1.5 fold) in three or more biological replicates of Notch mutant hair follicles compared to wild-type controls (p-value<0.05). Unsupervised hierarchical clustering analysis failed to distinguish between the mutants.
2016-02-29 | E-GEOD-77997 | biostudies-arrayexpress
Project description:Atopic dermatitis (AD) is a pruritic and inflammatory disorder characterized by elevated levels of thymic stromal lymphopoietin (TSLP). Pruritus is prevalent in epidermolysis bullosa (EB). Currently, epidermal barrier disruption is known to trigger TSLP upregulation, however, mechanisms controlling TSLP expression remain incompletely understood. Tslp levels were highly upregulated in the epidermis and in the serum of keratin-deficient mice. Cultured keratinocytes either lacking keratins or expressing the dominant K14p.Arg131Pro show highly increased TSLP. Re-expression of wild-type K14 normalized TSLP levels. We demonstrate that keratins regulate Tslp expression in parts through MEK1/2 activation. The finding that 8 out of 17 EBS patients show elevated TSLP serum levels supports a major role of keratins in TSLP regulation. Our data identify a novel, keratin-dependent and cell-intrinsic regulation of Tslp. Elevated TSLP levels likely explain the high prevalence of pruritus in EBS and additional forms of EB, suggesting TSLP as novel biomarker for pruritus in EB. MEK1/2, in addition to calcineurin inhibitors, might be suitable drugs to treat itch in EB. Investigation was carried out using Keratin deficient keratinocytes isolated from typeI keratin mice.
2016-03-26 | E-GEOD-79596 | biostudies-arrayexpress
Project description:Physiologically, Notch signal transduction plays a pivotal role in differentiation; pathologically, Notch signaling contributes to the development of cancer. Transcriptional activation of Notch target genes involves cleavage of the Notch receptor in response to ligand binding, production of the Notch intracellular domain (NICD), and NICD migration into the nucleus and assembly of a coactivator complex. Posttranslational modifications of the NICD are important for its transcriptional activity and protein turnover. Deregulation of Notch signaling and stabilizing mutations of Notch1 have been linked to leukemia development. We found that the methyltransferase CARM1 (coactivator-associated arginine methyltransferase 1; also known as PRMT4) methylated NICD at five conserved arginine residues within the C-terminal transactivation domain. CARM1 physically and functionally interacted with the NICD-coactivator complex and was found at gene enhancers in a Notch-dependent manner. Although a methylation-defective NICD mutant was biochemically more stable, this mutant was biologically less active as measured with Notch assays in embryos of Xenopus laevis and Danio rerio. Mathematical modeling indicated that full but short and transient Notch signaling required methylation of NICD. Analysis of gene expression upon inactivation and activation of Notch signaling in Beko cells.
2015-03-26 | GSE62528 | GEO
Project description:Atopic dermatitis (AD) is a pruritic and inflammatory disorder characterized by elevated levels of thymic stromal lymphopoietin (TSLP). Pruritus is prevalent in epidermolysis bullosa (EB). Currently, epidermal barrier disruption is known to trigger TSLP upregulation, however, mechanisms controlling TSLP expression remain incompletely understood. Tslp levels were highly upregulated in the epidermis and in the serum of keratin-deficient mice. Cultured keratinocytes either lacking keratins or expressing the dominant K14p.Arg131Pro show highly increased TSLP. Re-expression of wild-type K14 normalized TSLP levels. We demonstrate that keratins regulate Tslp expression in parts through MEK1/2 activation. The finding that 8 out of 17 EBS patients show elevated TSLP serum levels supports a major role of keratins in TSLP regulation. Our data identify a novel, keratin-dependent and cell-intrinsic regulation of Tslp. Elevated TSLP levels likely explain the high prevalence of pruritus in EBS and additional forms of EB, suggesting TSLP as novel biomarker for pruritus in EB. MEK1/2, in addition to calcineurin inhibitors, might be suitable drugs to treat itch in EB.
2016-03-26 | GSE79596 | GEO
Project description:Physiologically, Notch signal transduction plays a pivotal role in differentiation; pathologically, Notch signaling contributes to the development of cancer. Transcriptional activation of Notch target genes involves cleavage of the Notch receptor in response to ligand binding, production of the Notch intracellular domain (NICD), and NICD migration into the nucleus and assembly of a coactivator complex. Posttranslational modifications of the NICD are important for its transcriptional activity and protein turnover. Deregulation of Notch signaling and stabilizing mutations of Notch1 have been linked to leukemia development. We found that the methyltransferase CARM1 (coactivator-associated arginine methyltransferase 1; also known as PRMT4) methylated NICD at five conserved arginine residues within the C-terminal transactivation domain. CARM1 physically and functionally interacted with the NICD-coactivator complex and was found at gene enhancers in a Notch-dependent manner. Although a methylation-defective NICD mutant was biochemically more stable, this mutant was biologically less active as measured with Notch assays in embryos of Xenopus laevis and Danio rerio. Mathematical modeling indicated that full but short and transient Notch signaling required methylation of NICD. Analysis of gene expression upon inactivation and activation of Notch signaling in Beko cells. Beko cells were treated with DAPT or DMSO for 24h. Or Beko cells were infected with a DNMAML-ER or Notch1-ER fusion protein. After Selection cells were treated with 4-OHT (Tamoxifen) or Ethanol for 48h.
2015-03-26 | E-GEOD-62528 | biostudies-arrayexpress
Project description:Expression of a constitutively active Notch-1 intracellular domain (NICD) in MCF-10A cells was found to induce two distinct types of 3D structures: large, hyperproliferative structures and small, growth-arrested structures with reduced cell-to-matrix adhesion. These heterogeneous phenotypes reflect differences in Notch pathway activation levels. High Notch activity caused loss of cell adhesion and inhibition of proliferation, whereas low Notch activity maintained matrix adhesion and provoked a strong hyperproliferative response. In order to gain insight into the dosage-dependent transcriptional events triggered by Notch1 activation, gene expression profiles induced 48 hours after infection of MCF-10A cells with retroviral vectors expressing full-length Notch-1, L1601P+âP, or NICD were compared. Full-length Notch-1 induced the weakest effect, L1601P+âP induced an intermediate effect and NICD induced the strongest effect. Results provide insight into the dichotomous activites of Notch during development and tumorigenesis. Twelve samples were harvested 48 h after retroviral infection with either vector control, full-length Notch1, Notch1 L1601P+âP, or NICD. Each condition was performed in triplicate.
2010-03-23 | E-GEOD-20285 | biostudies-arrayexpress
Project description:Analysis of differential gene expression in Psen-null and RBPjk-null epidermal keratinocytes. The hypothesis tested in the present study was that canonical Notch signals could be present at the beginning of epidermal stratification (E13.5) in the RBPj-null epidermis. If an early signal was preserved by epigenetic memory, E18.5 RBPj-null epidermis would resemble the wild-type at the transcriptional level.
2016-02-29 | GSE77813 | GEO
Project description:In this study, we explored the transcriptomic consequences of strong activation of the Notch pathway in embryonic human neural stem cells and in gliomas. For this we used a forced expression of the Notch intracellular domain (NICD). Glioblastoma multiforms (GBMs) are highly vascularized brain tumors containing a subpopulation of multipotent cancer stem cells. These cells closely interact with endothelial cells in neurovascular niches. In this study we have uncovered a close link between the Notch1 pathway and the tumoral vascularization process of GBM stem cells. We observed that although the Notch1 receptor was activated, the typical target proteins (HES5, HEY1, HEY2) were not or barely expressed in two explored GBM stem cell cultures. Notch1 signalling activation by expression of the intracellular form (NICD) in these cells was found to reduce their growth rate and migration which was accompanied by the sharp reduction of neural stem cell transcription factor expression (ASCL1, OLIG2, SOX2) while HEY1/2, KLF9, SNAI2 transcription factors were upregulated. Expression of OLIG2 and growth were restored after termination of Notch1 stimulation. Remarkably, NICD expression induced the expression of pericyte cell markers (NG2, PDGFRb and a-smooth muscle actin (aSMA)) in GBM stem cells. This was paralleled with the induction of several angiogenesis-related factors most notably cytokines (HB-EGF, IL8, PLGF), metalloprotease (MMP9) and adhesion proteins (VCAM-1, ICAM-1, ITGA9). In xenotransplantation experiments, contrasting with the infiltrative and poorly-vascularized tumors obtained with control GBM stem cells, Notch1 stimulation resulted in poorly-disseminating but highly-vascularized grafts containing large vessels with lumen. Notch1-stimulated GBM cells expressed pericyte cell markers and closely associated with endothelial cells. These results reveal an important role for the Notch1 pathway in regulating GBM stem cell plasticity and angiogenic properties. Embryonic human neural progenitors obtained from Lonza, the U87 glioma cell line, and glioma cancer stem cells (Gb4 and Gb7) characterized in Guichet et al. (Glia, 2013, 61(2), 225-39) were infected with lentiviruses expressing YFP or YFP-IRES-NICD (activated form of Notch receptor). After 48h, RNA were extracted for Affymetrix microarray analysis.
2014-06-04 | E-GEOD-44561 | biostudies-arrayexpress
Project description:Analysis of differential gene expression of total skin from different Notch signaling pathway mutants (specifically PSmut, RBPjmut, and PSRmut). Preselin1&2 are the core components of g-secretase enzyme which essential for the Notch receptor activation. RBPjk is the DNA-binding partner of the Notch Intracellular Domain. The hypothesis tested in the present study was RBPjmut skin would resemble the wild-type skin at the transcriptional level, since RBPjmut mice exhibit milder phenotype than PSmut or PSRmut mice.
2016-02-29 | GSE77887 | GEO
Project description:Somatic NOTCH1 mutations are found in ~60% of T lineage acute lymphoblastic leukemias (T-ALLs). Notch1 is cleaved by γ secretase to generate activated Notch intracellular domain (NICD) proteins. The NOTCH1 mutations found in T-ALL constitutively activate Notch1 signaling by increasing NICD levels. Genetic alterations in components of the Ras/PI3 kinase (PI3K)/Akt pathway are also highly prevalent in T-ALL, and often coexist with NOTCH1 mutations. Exposing a T-ALL cell line to the PI3 kinase (PI3K) inhibitor GDC-0941 generated drug resistant clones that down-regulated NICD expression. To address the in vivo relevance of this unexpected observation, we transplanted primary wild-type (WT) and KrasG12D mutant T-ALLs into recipient mice, and treated them with GDC-0941 alone and in combination with the MEK inhibitor PD0325901 (PD901). Although many leukemias responded dramatically to these targeted agents in vivo, drug-resistant clones invariably emerged. Multiple resistant T-ALLs lost NICD expression through mechanisms that included loss of Notch1 mutations found in the parental T-ALL. These GDC-0941-resistant leukemias exhibited reduced expression of many Notch1 target genes, elevated levels of phosphorylated Akt (pAkt), and displayed cross-resistance to γ secretase inhibitors (GSIs). Consistent with these data, inhibiting Notch1 activity in T-ALL cells enhanced PI3K signaling, providing a likely mechanism for in vivo selection against clones with Notch1 pathway activation. Thus, oncogenic Notch1 mutations that promote clonal outgrowth during malignant transformation unexpectedly “switch” to become deleterious during treatment with a PI3K inhibitor. These data advance our understanding of T-ALL pathogenesis and have implications for implementing new therapeutic regimens. We analyzed 28 mouse T-ALL samples obtained after in vivo treatment with GDC-0941 alone or GDC-0941 + PD0325901. These T-ALL samples are either Kras wild type or harbor a KrasG12D mutations.
2014-06-24 | E-GEOD-48260 | biostudies-arrayexpress