Developmental heterogeneity of cardiac fibroblasts does not predict pathological proliferation and activation
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ABSTRACT: The resulting heat map shows an increased expression of ECM and ECM regulatory genes, 'activated' fibroblast genes, and cell cycle genes in the THY1+HE- sorted cells and in Tie2 and Tbx18-derived cardiac fibroblasts from TAC relative to sham RNA-seq of Thy1+HE- cells isolated 7 days after injury in mice that underwent sham and transaortic constriction (TAC) operations.
Project description:The resulting heat map shows an increased expression of ECM and ECM regulatory genes, 'activated' fibroblast genes, and cell cycle genes in the THY1+HE- sorted cells and in Tie2 and Tbx18-derived cardiac fibroblasts from TAC relative to sham
Project description:miRNA pattern of cardic myocytes, cardiac fibroblasts and cardiac endothelial cells isolated from adult mice hearts at different time points after transaortic constriction (TAC) or sham surgery.
Project description:Mouse embryonic fibroblasts were reprogrammed using Oct4, Sox2, Klf4 and cMyc genes. At day 5, cells were sorted as Thy1 positive and Thy1 negative populations. microRNA expression profile from Thy1+ and Thy1- cells was compared with original MEFs (D0) to identify significantly changed microRNAs during initial stage of reprogramming
Project description:MicroRNAs (miRs) play a key role in the control of gene expression in a wide array of tissue systems where their functions include the regulation of self-renewal, cellular differentiation, proliferation, and apoptosis. However, the functional importance of individual miRs in controlling spermatogonial stem cell (SSC) homeostasis has not been investigated. Using high-throughout sequencing, we profiled the expression of miRs in the Thy1+ testis cell population, which is highly enriched for SSCs, and the Thy1- cell population, composed primarily of testis somatic cells. In addition, we profiled the global expression of miRs in cultured germ cells, also enriched for SSCs. Our results demonstrate that miR-21, along with miR-34c, -182, -183, -146a, -465a-3p, -465b-3p, -465c-3p, and -465c-5p are preferentially expressed in the Thy1+ SSC-enriched population, as compared to Thy1- somatic cells, and we further observed that Thy1+ SSC-enriched testis cells and SSC-enriched cultured germ cells share remarkably similar miR expression profiles. Spermatogonial Stem Cell enriched cell populations (freshly isolated and short-term cultured) and somatic cell populations were isolated from C57B/L6 mouse donors and subjected to small RNA isolation and sequencing.
Project description:Black six animals received either an Adeno associated virus leading to overexpression of Luciferase or Histone deacetyase 4 aminoacids 1-201. After 3 weeks of expression, animals got transaortic banding (TAC) to induce pathological cardiac remodeling. We compared both groups to Back six animals with sham surgery and overexpression of Luziferase. 3 male animals per group (5 replicates) at an age of 8 weeks were treated with an adenoassociated virus (AAV) containing a coding sequence for Luziferase or Histone Deacetylase 4 (aminoacids 1-201) und der the control of the MLC-promoter. Both groups were then exposed to transaortic constriction. As a control served AAV treated animals with overepression of luziferase and sham.
Project description:C57BL/6N animals received at the age of 6 weeks either adeno associated virus from serotype 9 (AAV9) leading to cardiac overexpression of luciferase (Luc, as control) or amino acids 1-201 of histone deacetyase 4 (HDAC4-NT) under the control of the cardiac myocyte-specific CMV-enhanced short (260bp) myosin light chain promoter (CMVenh/MLC260). Transaortic constriction (TAC) and sham operation was conducted 6 weeks later in 12 week old mice to induce pathological pressure overload. Organs were harvested 4 weeks after TAC at the age of 16 weeks and total RNA was used for microarray analysis. Three groups were compared: 1) sham-operated mice that were pretreated with AAV9 (CMVenh/MLC260)-Luc, 2) TAC-operated mice that were pretreated with AAV9 (CMVenh/MLC260)-Luc, 3) TAC-operated mice that were pre-treated with AAV9 (CMVenh/MLC260)-HDAC4-NT.
Project description:Small hepatocyte-like progenitor cells (SHPCs) are hepatocytic progenitor cells that transiently form clusters in rat livers treated with retrorsine and with 70% partial hepatectomy (PH). We previously reported that transplantation of Thy1+ cells derived from D-galactosamine-treated livers promotes SHPC expansion, resulting in the acceleration of liver regeneration. Extracellular vesicles (EVs) produced by Thy1+ cells act on sinusoidal endothelial cells (SECs) and Kupffer cells to secrete IL17B and IL25, respectively, resulting in SHPC activation through IL17 receptor B (RB) signaling. Our aim is to identify factors in Thy1-EVs that activate IL17RB signaling. Thy1+ cells isolated from rats with D-galactosamine-induced liver injury were cultured for one week. Although some liver stem/progenitor cells proliferated into colonies, others maintained as mesenchymal cells (MCs). Thy1-MCs or Thy1-liver stem/progenitor cells were transplanted into retrorsine/PHtreated livers to examine their effects on SHPCs. SHs isolated from adult rat livers were used to validate factors regulating growth induction. The number and size of SHPCs remarkably increased in livers transplanted with Thy1-MCs. Comprehensive analysis of Thy1-MC-EVs revealed that miR-199a-5p, CINC-2, and MCP-1 are candidates for stimulating SHPC growth. Administration of the miR-199a-5p mimic, and not CINC-2, promoted SH growth. SECs treated with CINC-2 induced IL17b expression and their conditioned medium promoted SH growth. Thy1-MC transplantation may accelerate liver regeneration due to SHPCs expansion, which is stimulated by CINC-2/IL17RB signaling and miR-199a-5p.
Project description:We used human embryonic stem cell-derived retinal ganglion cells (RGCs) to characterize the transcriptome of 1,174 cells at the single cell level. The human embryonic stem cell line BRN3B-mCherry A81-H7 was differentiated to RGCs using a guided differentiation approach. Cells were harvested at day 36 and incubated with THY1 antibody (Miltenyi) before undergoing FACS. THY1 positive and THY1 negative cells were subsequently prepared for single cell RNA sequencing. Single cell suspensions were loaded onto 10X Genomics Single Cell 3' Chips along with the reverse transcription master mix as per the manufacturer's protocol for the Chromium Single Cell 3' v2 Library (10X Genomics; PN-120233), to generate single cell gel beads in emulsion. Libraries were then sequenced on an Illumina HiSeq 2500.
Project description:Accumulation of activated cardiac fibroblasts plays a key role in heart failure progression. These cells deposit excessive extracellular matrix that leads to mechanical stiffness, myocyte uncoupling and ischemia. To investigate whether two developmentally distinct cardiac fibroblast populations exhibit distinct expression profiles in response to cardiac injury, and therefore might necessitate distinct therapeutic targeting, we performed microarray analysis on FACS sorted cells. Tie2cre lineage traced CFs, non Tie2cre lineage traced cardiac fibroblasts and endothelial cells were isolated from left ventricle of SHAM operated and banded hearts at the onset of fibrosis, one week after surgery. We used microarrays to detail the global programme of gene expression in cardiac fibroblasts and endothelium following pressure overload. Tie2cre lineage traced, non-tie2cre lineage traced fibroblasts and endothelial cells were sorted from left ventricle of 3 SHAM operated and 3 TAC operated adult male Black Swiss mice. Tie2cre lineage traced, non-tie2cre lineage traced fibroblasts and endothelial cells were sorted from left ventricle of 3 SHAM operated and 3 Transaortic Constriction (TAC) operated adult male Black Swiss mice for RNA extraction and Affymetrix microarray analysis. Hypertrophy in TAC animals, an lack of hypertrophy in SHAM operated animals, was evaluated by hemodynamic measurements before surgery and one week after surgery. Cells were isolated one week after surgery.
Project description:miR-133a-3p is a highly abundant cardiomyocyte-enriched microRNA whose expression is persistently decreased in response to pressure overload (or transverse aortic constriction, TAC) in mice. Overexpression of miR-133a in cardiomyocytes of mouse hearts in vivo (under the control of the Myh6 promoter) decreases pressure overload-induced apoptosis and fibrosis. In previous studies using microarray platforms, we detected numerous mRNAs whose transcript levels were altered by either or both of miR-133a overexpression and pressure overload. The data set presented here builds upon our previous study in these mice by examining mRNA-RISC associations (using Ago2-immunoprecipitated RNA) and global mRNA abundances via RNA-sequencing procedures, and tests the hypothesis that mRNAs targeted by overexpressed miR-133a are dissimilar between sham and TAC contexts. Cardiac polyadenylated RNA (mRNA) profiles were generated from nontransgenic and transgenic mouse hearts of FVB/N background, on Illumina HiSeq 2000 instruments. Male mice 8-12 weeks of age were used in these studies, and subjected to sham surgery or 1 week of pressure-overload via transverse aortic constriction (TAC). 3 nontransgenic sham, 7 transgenic sham, 5 nontransgenic TAC, 4 transgenic TAC, each with mRNA-seq and RISC-seq (mRNA-seq of Ago2 immunoprecipitate) data.