HMGN1 contributes to the shortened latency of liver tumorigenesis by changing a chromatin structure and expression of relevant genes
Loss of the nucleosome-binding protein HMGN1 affects the rate of N-nitrosodiethylamine-induced hepatocarcinogenesis in mice.
Specimen part, TreatmentView Samples
To understand the role of LSD1 in B cell differentiation, mice with B cell conditional deletion of LSD1 were intravenously inoculated with LPS. After 3 days, B220+GL7-CD138- naïve B cells and CD138+ plasmablasts were FACS-sorted from the spleens and RNA-seq was performed to identify LSD1-target regulated genes. Overall design: RNA-seq on control or LSD1-deficient murine naïve B cells or plasmablasts.
The Histone Demethylase LSD1 Regulates B Cell Proliferation and Plasmablast Differentiation.
Sex, Specimen part, Cell line, SubjectView Samples
Gene expression profile studies have identified an interferon signature in whole blood or mononuclear cell samples from patients with systemic lupus erythematosus. This study was designed to determine whether specific lymphocyte and myeloid subsets freshly isolated from the blood of systemic lupus erythematosus patients demonstrated unique gene expression profiles compared to subsets isolated from healthy controls.
Combined deficiency of proapoptotic regulators Bim and Fas results in the early onset of systemic autoimmunity.
No sample metadata fieldsView Samples
A soy diet worsens the progression of an inherited form of hypertrophic cardiomyopathy (HCM) in male mice when compared to casein-fed mice. Females are largely resistant to this diet effect and better preserve cardiac function. We hypothesized that the abundant phytoestrogens found in soy are mainly responsible for this diet-dependent phenotype. Indeed, feeding male mice a phytoestrogen-supplemented casein-based diet can recapitulate the negative outcome seen when male mice are fed a standard soy-based diet.
Estrogenic compounds are not always cardioprotective and can be lethal in males with genetic heart disease.
Sex, Specimen partView Samples
5 strains of rat, WKY, spontaneously hypertensive rat (SHR) and 3 reciprocal congenic strains (WconSA, SconSA and SISA) were used to generate expression data across the genome using the Affymetrix rat genome chip set comprising the 230 A and 230 B chips. 5 animals from each strain were used. Expression data was determined for 2 ages: 6 week and 24 week with whole kidney RNA.
Genetic dissection of a blood pressure quantitative trait locus on rat chromosome 1 and gene expression analysis identifies SPON1 as a novel candidate hypertension gene.
Age, Specimen partView Samples
B cells provide humoral immunity by differentiating into antibody-secreting plasma cells, a process that requires cell division and is linked to DNA hypomethylation and gene regulation. Conversely, accumulation of DNA methylation in B cell differentiation is less apparent. To determine the role of de novo DNA methylation in B cell differentiation, the de novo DNA methyltransferases, Dnmt3a and Dnmt3b, were deleted in B cells resulting in phenotypically normal B cell development in the bone marrow, spleen and lymph nodes. However, upon immunologic challenge, mice deficient for Dnmt3a and Dnmt3b (Dnmt3-deficient) accumulated more antigen-specific B cells and bone marrow chimeras showed this was cell-autonomous. Additionally, a five-fold increase in splenic and bone marrow plasma cells was observed. Molecular analysis revealed that Dnmt3-deficient bone marrow plasma cells failed to repress gene expression to the same level as their Dnmt3ab-sufficient counterparts. This was coupled with a failure of Dnmt3-deficient germinal center B cells and plasma cells to gain and/or maintain DNA methylation at several thousand loci that were clustered in enhancers of genes that function in B cell activation and homing. Analysis of chromatin accessibility showed Dnmt3-deficient plasma cells had increased accessibility at several genes involved in hematopoiesis and B cell differentiation. These data show that de novo DNA methylation limits B cell activation, proliferation and differentiation, and support a model whereby DNA methylation represses the aberrant transcription of genes silenced in B cell differentiation to maintain plasma cell homeostasis. Overall design: Naïve lymph node B cells (B220+ GL7- Fas-), Phycoerythrin-specific germinal center B cells (B220+ GL7+ Fas+ PE+), and bone marrow plasma cells (CD138+) were compared between Cd19cre/wtDnmt3afl/flDnmt3bfl/fl (Dnmt3-deficient) and littermate control Cd19wt/wtDnmt3afl/flDnmt3bfl/fl (Dnmt3-sufficient) mice using RRBS, RNA-seq, and ATAC-seq. Naïve lymph node B cells were taken from naïve mice, whereas PE-specific germinal center B cells and bone marrow plasma cells were isolated from mice that had been immunized with phycoerythrin 30 days prior. This Series includes the RNA-seq component of the study.
B cell activation and plasma cell differentiation are inhibited by de novo DNA methylation.
Sex, Specimen part, SubjectView Samples
To understand the role of EZH2 in Plasmablast function EZH2 was inducibly deleted using tamoxifen and B cells stimulated to differentiate with LPS in vivo. After 3 days, CD138+ cells were enriched from the spleens and RNA-seq was performed to identify the genes targeted by EZH2 for repression. Overall design: RNAseq on control or EZH2-deficient murine plasmablasts.
EZH2 Represses the B Cell Transcriptional Program and Regulates Antibody-Secreting Cell Metabolism and Antibody Production.
Sex, Specimen part, Cell line, Treatment, SubjectView Samples
The integrated stress response (ISR) controls cellular adaptations to nutrient deprivation, redox imbalances and ER stress. ISR genes are upregulated in stressed cells, primarily by the bZIP transcription factor ATF4 through its recruitment to cis-regulatory C/EBP:ATF response elements (CAREs) together with a dimeric partner of uncertain identity. Here we show that C/EBP:ATF4 heterodimers, but not C/EBP:ATF4 dimers, are the predominant CARE binding species in stressed cells. C/EBP and ATF4 associate with genomic CAREs in a mutually-dependent manner and co-regulate many ISR genes. By contrast, the C/EBP family members C/EBP and CHOP were largely dispensable for induction of stress genes. Cebpg/ MEFs proliferate poorly and exhibit oxidative stress due to reduced glutathione levels and impaired expression of several glutathione biosynthesis pathway genes. Cebpg/ mice (C57BL/6 background) display reduced body size and microphthalmia, similar to ATF4-null animals. In addition, C/EBP-deficient newborns die from atelectasis and respiratory failure which can be mitigated by in utero exposure to the anti-oxidant, N-acetyl-cysteine. Cebpg/ mice on a mixed strain background show improved viability but, upon aging, develop significantly fewer malignant solid tumors compared to WT animals. Our findings identify C/EBP as a novel anti-oxidant regulator and an obligatory ATF4 partner that controls redox homeostasis in normal and cancerous cells.
C/EBPγ Is a Critical Regulator of Cellular Stress Response Networks through Heterodimerization with ATF4.
Specimen partView Samples
Inflammation has pleiotropic effects on carcinogenesis and tumor progression. Signaling through the adaptor protein MyD88 promotes carcinogenesis in several chemically induced cancer models. Interestingly, we observed a protective role for MyD88 in the development of AOM/DSS colitis-associated cancer. The inability of Myd88-/- mice to heal ulcers generated upon injury creates an inflammatory environment that increases the frequency of mutations and results in a dramatic increase in adenoma formation and cancer progression. Susceptibility to colitis development and enhanced polyp formation were also observed in Il18-/- mice upon AOM/DSS treatment, suggesting that the phenotype of MyD88 knockouts is in part due to their inability to signal through the IL-18 receptor. This study revealed a previously unknown level of complexity surrounding MyD88 activities downstream of different receptors that differentially impact tissue homeostasis and carcinogenesis.
MyD88-mediated signaling prevents development of adenocarcinomas of the colon: role of interleukin 18.
Specimen part, Disease, Disease stageView Samples
Tfh and B cells were cultured together with or without Tfr cells. After 4 days Tfh and B cells were sorted and prepared for 3'' targeted RNA-seq. Overall design: Examination of transcriptional changes upon suppression of Tfh and B cells.
Suppression by T<sub>FR</sub> cells leads to durable and selective inhibition of B cell effector function.
Specimen part, Cell line, SubjectView Samples