Transcriptome profiling of GLUTag cells with NaHS and GSH treatment
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA912111 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR22730677_1.fastq.gz | Fastqsanger.gz | |||
| SRR22730677_2.fastq.gz | Fastqsanger.gz | |||
| SRR22730678_1.fastq.gz | Fastqsanger.gz | |||
| SRR22730678_2.fastq.gz | Fastqsanger.gz | |||
| SRR22730679_1.fastq.gz | Fastqsanger.gz |
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2013-04-02 | E-GEOD-45677 | biostudies-arrayexpress
Project description:The essential thiol antioxidant, glutathione (GSH) is recruited into the nucleus of mammalian cells early in cell proliferation, suggesting a key role of the nuclear thiol pool in cell cycle regulation. However, the functions of nuclear GSH (GSHn) and its integration with the cytoplasmic GSH (GSHc) pools in whole cell redox homeostasis and signaling are unknown. Here we show that GSH is recruited into the nucleus early in cell proliferation in Arabidopsis thaliana, confirming the requirement for localization of GSH in the nucleus as a universal feature of cell cycle regulation. GSH accumulation in the nucleus was triggered by treatments that synchronize cells at G1/S as identified by flow cytometry and marker transcripts. Significant decreases in transcripts associated with oxidative signaling and stress tolerance occurred when GSH was localized in the nucleus. Increases in GSH1 and GSH2 transcripts accompanied the large increase in total cellular GSH observed during cell proliferation, but only GSH2 was differentially expressed in cells with high GSHn relative to those with an even intracellular distribution of GSH. Of the 7 Bcl-2 associated (BAG) genes in A. thaliana, only the nuclear-localized BAG 6 was differentially expressed in cells with high GSHn compared to GSHc. We conclude that GSHn is associated with decreased oxidative signaling and stress responses and that whole cell redox homeostasis is restored as the cell cycle progresses by enhanced GSH synthesis and accumulation in the cytoplasm. Arabidopsis cells were harvested at points during cell proliferation where GSH was localized either in the nucleus (GSHn) or where GSH was distributed throughout the cytoplasm (GSHc) for RNA extraction and hybridization on Affymetrix microarrays. We selected three stages where the GSH was into the nucleus and three stages where the GSH was distributed throughout the cells.
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Project description:The essential thiol antioxidant, glutathione (GSH) is recruited into the nucleus of mammalian cells early in cell proliferation, suggesting a key role of the nuclear thiol pool in cell cycle regulation. However, the functions of nuclear GSH (GSHn) and its integration with the cytoplasmic GSH (GSHc) pools in whole cell redox homeostasis and signaling are unknown. Here we show that GSH is recruited into the nucleus early in cell proliferation in Arabidopsis thaliana, confirming the requirement for localization of GSH in the nucleus as a universal feature of cell cycle regulation. GSH accumulation in the nucleus was triggered by treatments that synchronize cells at G1/S as identified by flow cytometry and marker transcripts. Significant decreases in transcripts associated with oxidative signaling and stress tolerance occurred when GSH was localized in the nucleus. Increases in GSH1 and GSH2 transcripts accompanied the large increase in total cellular GSH observed during cell proliferation, but only GSH2 was differentially expressed in cells with high GSHn relative to those with an even intracellular distribution of GSH. Of the 7 Bcl-2 associated (BAG) genes in A. thaliana, only the nuclear-localized BAG 6 was differentially expressed in cells with high GSHn compared to GSHc. We conclude that GSHn is associated with decreased oxidative signaling and stress responses and that whole cell redox homeostasis is restored as the cell cycle progresses by enhanced GSH synthesis and accumulation in the cytoplasm.
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Project description:Hydrogen sulfide (H2S), a traditionally known cytotoxic gas, has been recently included in the gasotransmitters family. Previous studies demonstrated that lifelong treatment with a slow H2S releasing donor extends yeast chronological lifespan (CLS), but it is not clear when the action of H2S benefits to CLS during yeast growth. Therefore, we investigated the effects of short H2S treatments at different time during yeast cell growth in the lifespan extension by using NaHS, a fast H2S-releasing donor. We show that short NaHS treatments at 4 days after inoculation extend yeast CLS while NaHS treatments earlier than 3 days after inoculation fail to do so. To reveal the mechanism of different consequences on yeast CLS of NaHS treatments at different times, we analyzed the transcriptome of Saccharomyces cerevisiae strain BY4742 with or without the early and late NaHS treatments. We found that the early and late NaHS treatments had similar effects on the expression of genes involved in pathways which are related to CLS regulation. Follow up qPCR and ROS analyses suggest that altered expression of some antioxidant genes by the early NaHS treatments were not stable enough to benefit CLS. Moreover, transcriptome data also indicated that some genes were regulated differently by the early and late H2S treatment such as genes involved in cell wall integrity. Specifically, we found that the expression of YPK2, a human SGK2 homolog and also a key regulator of the yeast cell wall synthesis, was significantly altered by the late NaHS treatment but not altered by the early NaHS treatment. Finally, the key role of YPK2 in CLS regulation by H2S is revealed by CLS data showing that the late NaHS treatment did not enhance the CLS of a ypk2 knockout mutant. This study sheds light on the molecular mechanism of CLS extension induced by H2S, and for the first time addresses the importance of H2S treatment timing for lifespan extension.
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