In the present study, we investigated the importance of histone deacetylase 6 (HDAC6) for glucocorticoid receptor (GR) mediated effects on glucose metabolism, and its potential as a therapeutic target for the prevention of glucocorticoid (GC)-induced diabetes. Dexamethasone (dex)-induced hepatic glucose output and GR translocation were analysed in wildtype (wt) and HDAC6-deficient (HDAC6ko) mice. The effect of the specific HDAC6-inhibitor tubacin was analysed in-vitro. Wt and HDAC6ko mice were subjected to 3 weeks dex treatment before analysis of glucose and insulin tolerance. HDAC6ko mice showed impaired dex-induced hepatic GR translocation. Accordingly, dex induced expression of a large number of hepatic genes was significantly attenuated in mice lacking HDAC6 and by tubacin in-vitro. Glucose output of primary hepatocytes from HDAC6ko mice was diminished. A significant improvement of dex-induced whole-body glucose intolerance as well as insulin resistance in HDAC6ko mice compared to wt littermates was observed. The present study demonstrates that HDAC6 is an essential regulator of hepatic GC stimulated gluconeogenesis and impairment of whole body glucose metabolism through modification of GR nuclear translocation. Selective pharmacological inhibition of HDAC6 may provide a future therapeutic option against the pro-diabetogenic actions of GCs.
Histone deacetylase 6 (HDAC6) is an essential modifier of glucocorticoid-induced hepatic gluconeogenesis.
Sex, Specimen part, TreatmentView Samples
Small endogenous C. elegans RNAs from L4 and young adult worms were prepared for sequencing using a protocol derived from Batista et al., (2008) and Lau et al. (2001). The small-RNA libraries were constructed using a method that does not require a 5' monophosphate (called 5' monophosphate-independent method, Ambros et al., 2003) to profile secondary siRNAs that have 5' triphosphorylated G. All preprocessed small-RNA reads were mapped to genome (ce6), allowing no mismatches. After excluding miRNAs, 21U RNAs, rRNAs, and other structural ncRNAs, the remaining reads were classified as 22G RNAs, 26G RNAs, and other siRNAs, based on their length and 5' terminal nucleotide. Overall design: Small-RNA libraries were sequenced in L4 and young adult stages in C.elegans.
Long noncoding RNAs in C. elegans.
Cell line, SubjectView Samples
In cell stress, mRNA in the cytoplasm is sequestered to the insoluble ribonucleoprotein (RNP) compartments containing stress granules. These RNP granules are known to be involved in the control of mRNA processing and decay, but it has been elusive whether the mRNA redistribution in cell stress is universal or specific to a subset of transcripts. Here we provide a transcriptome-wide profiles of the RNP granules in cell stress and show that mRNA accumulation in stress granule differentially affects individual transcripts. mRNA species accumulated in stress granules are largely conserved across distinct stress types, such as in endoplasmic reticulum stress, heat shock and arsenic stress. Many mRNA species involved in cell survival and proliferation are more dynamically redistributed, suggesting that mRNA sequestration can be a specific response mechanism through which cells can reshape the landscape of their transcriptome and affect the cell fate determination in stress conditions . Overall design: 24 samples are analyzed, which include 3 replicates for control (DMSO) cytoplasmic fraction, 3 replicates of control (DMSO) RNP granule fraction, 3 replicates of Thapsigargin treated cytoplasmic fraction, 3 replicates of Thapsigargin treated RNP granule fraction, 2 replicates of control (H2O) cytoplasmic fraction, 2 replicates of control (H2O) RNP granule fractions, 2 replicates of heat shock (HS) treated cytoplsmic fraction (HS), 2 replicates of heat shock (HS) treated RNP granule fraction, 2 replicates of arsenite treated cytoplasmic fraction, and 2 replicates of arsenite treated RNP granule fraction.
Systematic Characterization of Stress-Induced RNA Granulation.
Cell line, Treatment, SubjectView Samples
BP and ER encode proteins that act synergistically to regulate Arabidopsis inflorescence architecture. To search for genes/proteins that influence the BP/ER signaling pathways, we conducted mutagenesis of the bp er double mutant and found that a mutation in FILAMENTOUS FLOWER (FIL) suppresses many of the morphological/developmental defects in bp er. Given that FIL encodes a Zn-finger containing transcription factor, microarray analysis was conducted on bp er vs. the bp er fil line to identify genes that are misregulated and which might implicate specific genes/proteins/pathways that are involved in regulating inflorescence development.
A novel Filamentous Flower mutant suppresses brevipedicellus developmental defects and modulates glucosinolate and auxin levels.
No sample metadata fieldsView Samples
A chemical screen was performed in search of compounds that modify plant responses to sucrose. This screen uncovered that sulfamethoxazole (SMX), a folate biosynthesis inhibitor, acted synergistically with sucrose to inhibit hypocotyl elongation, suggesting interaction between these two pathways. Transcriptome analysis was performed to identify changes in transcript abundance that may underpin crosstalk between sucrose and SMX. Three-day-old dark-grown seedlings were treated to sucrose and SMX at concentrations that induced no change in hypocotyl elongation when administered independently, yet restricted elongation when both were present in the growth media (10mM and 0.2M, respectively). This analysis uncovered multiple core auxin signalling components that exhibit altered transcript abundance in response to co-treatment with sucrose and SMX, suggesting that auxin signalling mediates crosstalk between these two pathways. This study highlights an input through which metabolic status can shape plant growth and development through hormone signalling.
Interplay between sucrose and folate modulates auxin signaling in Arabidopsis.
Specimen partView Samples
Gametogenesis is dependent on the expression of germline-specific genes. However, it remains unknown how the germline epigenome is distinctly established from that of somatic lineages. Here we show that genes commonly expressed in somatic lineages and spermatogenesis-progenitor cells undergo repression in a genome-wide manner in late stages of the male germline and identify underlying mechanisms. SCML2, a germline-specific subunit of a Polycomb repressive complex 1 (PRC1), establishes the unique epigenome of the male germline through two distinct antithetical mechanisms. SCML2 works with PRC1 and promotes RNF2-dependent ubiquitination of H2A, thereby marking somatic/progenitor genes on autosomes for repression. Paradoxically, SCML2 also prevents RNF2-dependent ubiquitination of H2A on sex chromosomes during meiosis, thereby enabling unique epigenetic programming of sex chromosomes for male reproduction. Our results reveal divergent mechanisms involving a shared regulator by which the male germline epigenome is distinguished from that of the soma and progenitor cells. Overall design: RNA-seq and ChIP-seq analyses using wild-type and Scml2-KO spermatogenic cells
Poised chromatin and bivalent domains facilitate the mitosis-to-meiosis transition in the male germline.
No sample metadata fieldsView Samples
High throughput massively parallel sequencing on mRNA libraries generated from cortices of bexarotene or vehicle treated APP/PS1 Overall design: Read counts analyzed for differential gene expression using edgeR
RNA-sequencing reveals transcriptional up-regulation of Trem2 in response to bexarotene treatment.
Specimen part, Cell line, SubjectView Samples
A majority of metazoan mRNAs are under microRNA (miRNA)/Argonaute (Ago)-mediated control of RNA stability at the post-transcriptional level. Although the molecular mechanism of the miRNA-mediated repression of target mRNAs through Ago/TNRC6 pathway have been largely elucidated, however, the existence of alternative TNRC6-independent miRNA-mediated post-transcriptional gene regulation pathway remains unknown. Here, we suggest that endogenous miRNAs (endo-miRNAs) can downregulate the target mRNAs via the alternative molecular pathway, Ago-associated UPF1/SMG7, core mediators of nonsense-mediated mRNA decay. Global analyses of mRNAs in a response to UPF1 RNA interference in miRNA-deficient cells reveal that 3'UTR-length-dependent mRNA decay by UPF1 requires endo-miRNA targeting via CUG motif. The repression of miRNA targets is more additively or synergistically accomplished by combination of Ago2 and UPF1 through UPF1-associated SMG7, recruiting CCR4-NOT deadenylase complex, in TNRC6-independent manner. We expect that the new miRNA-mediated mRNA decay pathway enables the miRNA targeting to become more predictable and expand the miRNA-mRNA regulatory network. Overall design: Examination of 11 different knockdown condition in HeLa cell type
UPF1/SMG7-dependent microRNA-mediated gene regulation.
Disease, Cell line, Treatment, SubjectView Samples
Recently, we have shown that disturbed flow caused by partial ligation of mouse carotid artery rapidly induces endothelial dysfunction and atherosclerosis within two weeks. To understand the molecular mechanisms by which disturbed flow induces atherosclerosis, we carried out genome-wide microarray study using endothelial RNAs isolated from the flow-disturbed left and the contralateral right common carotid artery (LCA and RCA) in C57BL/6 mice.
Discovery of novel mechanosensitive genes in vivo using mouse carotid artery endothelium exposed to disturbed flow.
Sex, Specimen part, TimeView Samples
Comparison of gene expression signatures in undifferentiated hESCs against differentiated embryoid bodies to identify key signatures defining self-renewal of hESCs.
Discovery of consensus gene signature and intermodular connectivity defining self-renewal of human embryonic stem cells.
Specimen part, Cell lineView Samples