Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts
Abstract The transcriptional repressor Rev-erbα is known to down-regulate fatty acid metabolism and gluconeogenesis gene expression. In animal models, disruption of Rev-erbα results in global changes in exercise performance, oxidative capacity, and blood glucose levels. However, the complete extent...
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| Format: | Article |
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Nature Portfolio
2021-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-91516-5 |
| _version_ | 1818403215739191296 |
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| author | Sean P. Gillis Hongwei Yao Salu Rizal Hajime Maeda Julia Chang Phyllis A. Dennery |
| author_facet | Sean P. Gillis Hongwei Yao Salu Rizal Hajime Maeda Julia Chang Phyllis A. Dennery |
| author_sort | Sean P. Gillis |
| collection | DOAJ |
| description | Abstract The transcriptional repressor Rev-erbα is known to down-regulate fatty acid metabolism and gluconeogenesis gene expression. In animal models, disruption of Rev-erbα results in global changes in exercise performance, oxidative capacity, and blood glucose levels. However, the complete extent to which Rev-erbα-mediated transcriptional repression of metabolism impacts cell function remains unknown. We hypothesized that loss of Rev-erbα in a mouse embryonic fibroblast (MEF) model would result in global changes in metabolism. MEFs lacking Rev-erbα exhibited a hypermetabolic phenotype, demonstrating increased levels of glycolysis and oxidative phosphorylation. Rev-erbα deletion increased expression of hexokinase II, transketolase, and ribose-5-phosphate isomerase genes involved in glycolysis and the pentose phosphate pathway (PPP), and these effects were not mediated by the transcriptional activator BMAL1. Upregulation of oxidative phosphorylation was not accompanied by an increase in mitochondrial biogenesis or numbers. Rev-erbα repressed proliferation via glycolysis, but not the PPP. When treated with H2O2, cell viability was reduced in Rev-erbα knockout MEFs, accompanied by increased ratio of oxidized/reduced NADPH, suggesting that perturbation of the PPP reduces capacity to mount an antioxidant defense. These findings uncover novel mechanisms by which glycolysis and the PPP are modulated through Rev-erbα, and provide new insights into how Rev-erbα impacts proliferation. |
| first_indexed | 2024-12-14T08:20:43Z |
| format | Article |
| id | doaj.art-81035a3f2c70403c89406b56f3664cac |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-14T08:20:43Z |
| publishDate | 2021-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-81035a3f2c70403c89406b56f3664cac2022-12-21T23:09:49ZengNature PortfolioScientific Reports2045-23222021-06-0111111210.1038/s41598-021-91516-5Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblastsSean P. Gillis0Hongwei Yao1Salu Rizal2Hajime Maeda3Julia Chang4Phyllis A. Dennery5Department of Molecular Biology, Cellular Biology, and Biochemistry, Brown UniversityDepartment of Molecular Biology, Cellular Biology, and Biochemistry, Brown UniversityDepartment of Molecular Biology, Cellular Biology, and Biochemistry, Brown UniversityDepartment of Molecular Biology, Cellular Biology, and Biochemistry, Brown UniversityDepartment of Molecular Biology, Cellular Biology, and Biochemistry, Brown UniversityDepartment of Molecular Biology, Cellular Biology, and Biochemistry, Brown UniversityAbstract The transcriptional repressor Rev-erbα is known to down-regulate fatty acid metabolism and gluconeogenesis gene expression. In animal models, disruption of Rev-erbα results in global changes in exercise performance, oxidative capacity, and blood glucose levels. However, the complete extent to which Rev-erbα-mediated transcriptional repression of metabolism impacts cell function remains unknown. We hypothesized that loss of Rev-erbα in a mouse embryonic fibroblast (MEF) model would result in global changes in metabolism. MEFs lacking Rev-erbα exhibited a hypermetabolic phenotype, demonstrating increased levels of glycolysis and oxidative phosphorylation. Rev-erbα deletion increased expression of hexokinase II, transketolase, and ribose-5-phosphate isomerase genes involved in glycolysis and the pentose phosphate pathway (PPP), and these effects were not mediated by the transcriptional activator BMAL1. Upregulation of oxidative phosphorylation was not accompanied by an increase in mitochondrial biogenesis or numbers. Rev-erbα repressed proliferation via glycolysis, but not the PPP. When treated with H2O2, cell viability was reduced in Rev-erbα knockout MEFs, accompanied by increased ratio of oxidized/reduced NADPH, suggesting that perturbation of the PPP reduces capacity to mount an antioxidant defense. These findings uncover novel mechanisms by which glycolysis and the PPP are modulated through Rev-erbα, and provide new insights into how Rev-erbα impacts proliferation.https://doi.org/10.1038/s41598-021-91516-5 |
| spellingShingle | Sean P. Gillis Hongwei Yao Salu Rizal Hajime Maeda Julia Chang Phyllis A. Dennery Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts Scientific Reports |
| title | Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts |
| title_full | Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts |
| title_fullStr | Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts |
| title_full_unstemmed | Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts |
| title_short | Loss of the transcriptional repressor Rev-erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts |
| title_sort | loss of the transcriptional repressor rev erbα upregulates metabolism and proliferation in cultured mouse embryonic fibroblasts |
| url | https://doi.org/10.1038/s41598-021-91516-5 |
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