Fasting upregulates the monocarboxylate transporter Mct1 at the rat blood-brain barrier through Ppar δ activation
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ABSTRACT:
PROVIDER: PRJNA1010118 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR25775119.fastq.gz | Fastqsanger.gz | |||
| SRR25775120.fastq.gz | Fastqsanger.gz | |||
| SRR25775121.fastq.gz | Fastqsanger.gz | |||
| SRR25775122.fastq.gz | Fastqsanger.gz | |||
| SRR25775123.fastq.gz | Fastqsanger.gz |
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Project description:Fasting is increasingly recognized as a potential therapeutic intervention in the field of neurology and psychiatry. However, its impact upon the blood-brain barrier (BBB), which strictly regulates the cerebral uptake of a wide range of endogenous compounds and drugs, is unknown. In this study we used a combination of in vivo and in vitro experiments to assess the response of the brain endothelium in rats that were fed ad libitum or fasted for one to three days. Fasting did not change the expression of the main drug efflux ATP-binding cassette transporters or P-glycoprotein activity at the BBB but modulated a restrictive set of solute carrier transporters. These included the monocarboxylate transporter Mct1, which is pivotal for the cerebral uptake of ketone bodies and thus for brain adaptation to fasting. Transcriptional profiling of freshly isolated brain endothelial cells showed that Ppar δ, a major lipid sensor, was selectively activated in response to fasting. In primary cultured rat brain endothelial cells, pharmacological agonists and free fatty acids selectively activated Ppar δ, resulting in the upregulation of Mct1 expression at the transcriptional and protein level. This was confirmed in vivo, by showing that dosing rats with a specific Ppar δ antagonist blocked the upregulation of Mct1 expression and activity induced by fasting. Altogether, our study describes for the first time a selective adaptive response of the brain vasculature to fasting and opens new perspectives for the metabolic manipulation of the BBB in the healthy or diseased brain.
2024-04-24 | GSE241803 | GEO
Project description:Fasting is increasingly recognized as a potential therapeutic intervention in the field of neurology and psychiatry. However, its impact upon the blood-brain barrier (BBB), which strictly regulates the cerebral uptake of a wide range of endogenous compounds and drugs, is unknown. In this study we used a combination of in vivo and in vitro experiments to assess the response of the brain endothelium in rats that were fed ad libitum or fasted for one to three days. Fasting did not change the expression of the main drug efflux ATP-binding cassette transporters or P-glycoprotein activity at the BBB but modulated a restrictive set of solute carrier transporters. These included the monocarboxylate transporter Mct1, which is pivotal for the cerebral uptake of ketone bodies and thus for brain adaptation to fasting. Transcriptional profiling of freshly isolated brain endothelial cells showed that Ppar d, a major lipid sensor, was selectively activated in response to fasting. In primary cultured rat brain endothelial cells, pharmacological agonists and free fatty acids selectively activated Ppar d, resulting in the upregulation of Mct1 expression at the transcriptional and protein level. This was confirmed in vivo, by showing that dosing rats with a specific Ppar d antagonist blocked the upregulation of Mct1 expression and activity induced by fasting. Altogether, our study describes for the first time a selective adaptive response of the brain vasculature to fasting and opens new perspectives for the metabolic manipulation of the BBB in the healthy or diseased brain.
To further confirm that the Ppar d pathway is active brain endothelial cells, we exposed pc-CECs to GW0742 in the presence or not of GSK0660 for 48 hours and analyzed the cell lysate using non-targeted quantitative proteomics (n=3).
2024-08-15 | PXD044587 | JPOST Repository
Project description:BackgroundThe blood-brain barrier (BBB) is pivotal for the maintenance of brain homeostasis and it strictly regulates the cerebral transport of a wide range of endogenous compounds and drugs. While fasting is increasingly recognized as a potential therapeutic intervention in neurology and psychiatry, its impact upon the BBB has not been studied. This study was designed to assess the global impact of fasting upon the repertoire of BBB transporters.MethodsWe used a combination of in vivo and in vitro experiments to assess the response of the brain endothelium in male rats that were fed ad libitum or fasted for one to three days. Brain endothelial cells were acutely purified and transcriptionaly profiled using RNA-Seq. Isolated brain microvessels were used to assess the protein expression of selected BBB transporters through western blot. The molecular mechanisms involved in the adaptation to fasting were investigated in primary cultured rat brain endothelial cells. MCT1 activity was probed by in situ brain perfusion.ResultsFasting did not change the expression of the main drug efflux ATP-binding cassette transporters or P-glycoprotein activity at the BBB but modulated a restrictive set of solute carrier transporters. These included the ketone bodies transporter MCT1, which is pivotal for the brain adaptation to fasting. Our findings in vivo suggested that PPAR δ, a major lipid sensor, was selectively activated in brain endothelial cells in response to fasting. This was confirmed in vitro where pharmacological agonists and free fatty acids selectively activated PPAR δ, resulting in the upregulation of MCT1 expression. Moreover, dosing rats with a specific PPAR δ antagonist blocked the upregulation of MCT1 expression and activity induced by fasting.ConclusionsAltogether, our study shows that fasting affects a selected set of BBB transporters which does not include the main drug efflux transporters. Moreover, we describe a previously unknown selective adaptive response of the brain vasculature to fasting which involves PPAR δ and is responsible for the up-regulation of MCT1 expression and activity. Our study opens new perspectives for the metabolic manipulation of the BBB in the healthy or diseased brain.
| S-EPMC11003008 | biostudies-literature
Project description:Many cancers rely on glycolytic metabolism to fuel rapid proliferation. This has spurred interest in designing drugs that target tumor glycolysis such as AZD3965, a small molecule inhibitor of Monocarboxylate Transporter 1 (MCT1) currently undergoing Phase I evaluation for cancer treatment. Since MCT1 mediates proton-linked transport of monocarboxylates such as lactate and pyruvate across the plasma membrane (Halestrap and Meredith, 2004), AZD3965 is thought to block tumor growth through disruption of lactate transport and glycolysis. Here we show that MCT1 inhibition impairs proliferation of glycolytic breast cancer cells that express MCT4 via disruption of pyruvate rather than lactate export. We found that MCT1 expression is elevated in glycolytic breast tumors and cell lines as well as in malignant breast and lung tissues. High MCT1 expression predicts poor prognosis in breast and lung cancer patients. Stable knockdown and AZD3965-mediated inhibition of MCT1 promote oxidative metabolism. Acute inhibition of MCT1 reduces pyruvate export rate but does not consistently alter lactate transport or glycolytic flux in breast cancer cells that also express MCT4. Despite the lack of glycolysis impairment, MCT1 loss-of-function decreases breast cancer cell proliferation and blocks growth of mammary fat pad xenograft tumors. Our data suggest that MCT1 expression is elevated in glycolytic cancers to promote pyruvate export, which when inhibited enhances oxidative metabolism and reduces proliferation. This study presents an alternative molecular consequence of MCT1 inhibitors that further supports their use as anti-cancer therapeutics. Since MCT1 levels are elevated in glycolytic and malignant breast tumors, we hypothesized that MCT1 may contribute to the Warburg effect metabolic phenotype. To test this hypothesis, we generated whole genome microarray data from breast cancer cell lines either a) expressing a short hairpin (sh)RNA-mediated stable knockdown of MCT1; or b) treated for 24 hours with an MCT1 inhibitor (AZD3965). Scramble shRNA or DMSO were used as controls, and all conditions were analzed in triplicate. The cell lines used â HS578T, SUM149PT, and SUM159PT â are among the most glycolytic in a panel of 31 breast cancer cell lines.
2016-03-08 | E-GEOD-76675 | biostudies-arrayexpress
Project description:Many cancers rely on glycolytic metabolism to fuel rapid proliferation. This has spurred interest in designing drugs that target tumor glycolysis such as AZD3965, a small molecule inhibitor of Monocarboxylate Transporter 1 (MCT1) currently undergoing Phase I evaluation for cancer treatment. Since MCT1 mediates proton-linked transport of monocarboxylates such as lactate and pyruvate across the plasma membrane (Halestrap and Meredith, 2004), AZD3965 is thought to block tumor growth through disruption of lactate transport and glycolysis. Here we show that MCT1 inhibition impairs proliferation of glycolytic breast cancer cells that express MCT4 via disruption of pyruvate rather than lactate export. We found that MCT1 expression is elevated in glycolytic breast tumors and cell lines as well as in malignant breast and lung tissues. High MCT1 expression predicts poor prognosis in breast and lung cancer patients. Stable knockdown and AZD3965-mediated inhibition of MCT1 promote oxidative metabolism. Acute inhibition of MCT1 reduces pyruvate export rate but does not consistently alter lactate transport or glycolytic flux in breast cancer cells that also express MCT4. Despite the lack of glycolysis impairment, MCT1 loss-of-function decreases breast cancer cell proliferation and blocks growth of mammary fat pad xenograft tumors. Our data suggest that MCT1 expression is elevated in glycolytic cancers to promote pyruvate export, which when inhibited enhances oxidative metabolism and reduces proliferation. This study presents an alternative molecular consequence of MCT1 inhibitors that further supports their use as anti-cancer therapeutics.
2016-03-08 | GSE76675 | GEO
Project description:Monocarboxylate transporter 1 (MCT1) exhibits essential roles in cellular metabolism and energy supply. Although MCT1 is highly expressed in activated B cells, it is not clear how MCT1-governed monocarboxylates transportation is functionally coupled to antibody production during the glucose metabolism. Here, we report that B cell-lineage deficiency of MCT1 significantly influences the class-switch recombination (CSR), rendering impaired IgG antibody responses in Mct1f/fMb1Cre mice after immunization. Metabolic flux reveals that glucose metabolism is significantly reprogrammed from glycolysis to oxidative phosphorylation in Mct1-deficient B cells upon activation. Consistently, activation-induced cytidine deaminase (AID), is severely suppressed in Mct1-deficient B cells due to the decreased level of pyruvate metabolite. Mechanistically, MCT1 is required to maintain the optimal concentration of pyruvate to secure the sufficient acetylation of H3K27 for the elevated transcription of AID in activated B cells. Clinically, we found that MCT1 expression levels are significantly upregulated in systemic lupus erythematosus patients, and Mct1 deficiency can alleviate the symptoms of bm12-induced murine lupus model. Collectively, these results demonstrate that MCT1-mediated pyruvate metabolism is required for IgG antibody CSR through an epigenetic dependent AID transcription, revealing MCT1 as a potential target for vaccine development and SLE disease treatment.
2023-12-14 | PXD047325 | Pride
Project description:MCT1 was deleted in Saccharomyces cerevisiae and gene expression was measured over a timecourse.
2020-06-02 | GSE151606 | GEO
Project description:Active thermogenic adipocytes voraciously consume energy substrates like fatty acids and glucose to maintain body temperature upon cold exposure. Despite strong evidence for the involvement of brown adipose tissue (BAT) in controlling systemic energy homeostasis upon nutrient excess, it is unclear how the activity of brown adipocytes is regulated in times of nutrient scarcity. Therefore, this study aimed to scrutinize factors that modulate BAT activity to balance thermogenic and energetic needs upon simultaneous fasting and cold-exposure. For an unbiased view we performed transcriptomic and miRNA sequencing analysis of BAT from acutely fasted (24 hours) mice under mild cold exposure. Combining these data with in-depth bioinformatic analyses and in vitro experiments, we defined a previously undescribed axis of p53 and miR-92a-1-5p that is highly upregulated by fasting in thermogenic adipocytes. p53, a fasting-responsive transcription factor, was previously shown to control genes involved in the thermogenic program and miR-92a-1-5p was found to negatively correlate with human BAT activity. Here, we elucidated fructose transporter Slc2a5 as one direct downstream target of this axis and show that fructose can be taken up by and metabolized in brown adipocytes. In sum, this study delineates a fasting-induced pathway involving p53 and miR-92a-1-5p impinging on Slc2a5 and suggests a contribution of fructose as an energy substrate in thermogenic adipocytes.
2022-05-11 | GSE199963 | GEO
Project description:MCT1 deletion in Saccharomyces cerevisiae
| PRJNA636574 | ENA
Project description:Using RNA-seq we identified the gene expression changes in MCT1-deficient B cells.
2023-11-22 | GSE247200 | GEO