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PROVIDER: PRJNA1011992 | ENA |
REPOSITORIES: ENA
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Project description:Bacteria can stimulate host lactate production, aiding their colonization and virulence. However, the role of pathogen-driven host lactate remains underexplored. We show that Pseudomonas aeruginosa (PA)-secreted quorum-sensing (QS) signaling molecule 2’-aminoacetophenone (2-AA) elevates and sustains lactate in PA-infected immune-cells and animal tissues. In support, 2-AA increases the protein abundance of the lactate transporter, MCT4, and lactyl-coenzyme A synthetase (guanosine triphosphate (GTP)-specific SCS (GTPSCS)), and GTPSCS’s interaction with the transcriptional coactivators CREB-binding protein (CBP) and p300. Lactate augmentation drives histone H3 lysine 18 lactylation (H3K18la) enrichment at the regulatory regions of key immune and metabolic genes. H3K18la and consequent transcriptional changes promote PA survival in macrophages. Inhibition of lactate or 2-AA synthesis impedes lactate augmentation and H3K18la and reduces PA survival in macrophages. The uncovered QS-driven H3K18la represents a seminal interplay during host-pathogen interaction. Targeting this QS-epigenetic axis may offer a viable therapeutic approach for chronic PA infection.
2025-12-01 | GSE302326 | GEO
Project description:Bacteria can stimulate host lactate production, aiding their colonization and virulence. However, the role of pathogen-driven host lactate remains underexplored. We show that Pseudomonas aeruginosa (PA)-secreted quorum-sensing (QS) signaling molecule 2’-aminoacetophenone (2-AA) elevates and sustains lactate in PA-infected immune-cells and animal tissues. In support, 2-AA increases the protein abundance of the lactate transporter, MCT4, and lactyl-coenzyme A synthetase (guanosine triphosphate (GTP)-specific SCS (GTPSCS)), and GTPSCS’s interaction with the transcriptional coactivators CREB-binding protein (CBP) and p300. Lactate augmentation drives histone H3 lysine 18 lactylation (H3K18la) enrichment at the regulatory regions of key immune and metabolic genes. H3K18la and consequent transcriptional changes promote PA survival in macrophages. Inhibition of lactate or 2-AA synthesis impedes lactate augmentation and H3K18la and reduces PA survival in macrophages. The uncovered QS-driven H3K18la represents a seminal interplay during host-pathogen interaction. Targeting this QS-epigenetic axis may offer a viable therapeutic approach for chronic PA infection.
2025-12-01 | GSE302311 | GEO
Project description:The organic acids lactate and diacetate are commonly used in combination in ready-to-eat foods because they show synergistic, i.e. greater than additive, ability to inhibit the growth of Listeria monocytogenes. Full genome microarrays were used to investigate the synergistic transcriptomic response of two L. monocytogenes strains, h7858 (serotype 4b) and f6854 (serotype 1/2a), to organic acid, under conditions controlling for osmotic and cold stress. Strains were exposed to BHI broth at 7°C with 4.65% water phase (w.p.) NaCl at pH 6.1 treated with 2% w.p. potassium lactate, 0.14% w.p. sodium diacetate, the combination of both at the same levels, or no inhibitors as control. RNA was extracted 8h after exposure, during lag phase, to capture gene expression changes during adaptation to the organic acid stress. Treatment with organic acids induced massive global transcriptional changes, with 1041 and 640 genes differentially expressed in h7858 and f6854. Major effects of treatment with lactate and diacetate are (i) a total of 474 and 209 genes, for h7858 and f6854, that showed synergistic expression differences, (ii) differential expression of membrane ion transport genes including those encoding ABC transporters of metals and decreased multi-drug transporter expression many ABC, PTS, and drug transporter systems, including increased PTS sugar transport and decreased multi-drug transporter expression, and (iii) altered metabolism including induction of a nutrient limiting stress response, reduction of menaquinone biosynthesis, and a shift from fermentative production of lactate and acetate and lactate to energetically less favorable, neutral acetoin. These data suggest that additional synergies in L. monocytogenes growth inhibition could be achieved by treatments that interfere with cellular energy generation processes. The dye-swapped, single loop design hybridizes a single biological replicate of both 2% water phase lactate (PL) and 0.14% water phase acetate (SDA) treatments to both the control (CTRL) and combination (PLSDA) treatments (4 hybridizations), using opposite dye labels for each sample, and a second biological replicate is hybridized with dye assignments swapped (4 more hybridizations) to balance labeling effects. The design was repeated twice comprising 16 hybridizations over 4 biological replicates for each strain, and 32 total hybridizations over both h7858 and f6854.
2011-11-03 | E-GEOD-25195 | biostudies-arrayexpress
Project description:Abstract: Therapeutic targeting of tumor angiogenesis with VEGF inhibitors results in demonstrable but transitory efficacy in certain human tumors and mouse models of cancer, limited by unconventional forms of adaptive/evasive resistance. In one such mouse model, potent angiogenesis inhibitors elicit compartmental reorganization of cancer cells around remaining blood vessels. The glucose and lactate transporters GLUT1 and MCT4 are induced in distal hypoxic cells in a HIF1α-dependent fashion, indicative of glycolysis. Tumor cells proximal to blood vessels instead express the lactate transporter MCT1, and p-S6, the latter reflecting mTOR signaling. Normoxic cancer cells import and metabolize lactate, resulting in upregulation of mTOR signaling via glutamine metabolism enhanced by lactate catabolism. Thus metabolic symbiosis is established in the face of angiogenesis inhibition, whereby hypoxic cancer cells import glucose and export lactate, while normoxic cells import and catabolize lactate. mTOR signaling inhibition disrupts this metabolic symbiosis, associated with upregulation of the glucose transporter GLUT2.
2016-07-15 | GSE80436 | GEO
Project description:The organic acids lactate and diacetate are commonly used in combination in ready-to-eat foods because they show synergistic, i.e. greater than additive, ability to inhibit the growth of Listeria monocytogenes. Full genome microarrays were used to investigate the synergistic transcriptomic response of two L. monocytogenes strains, h7858 (serotype 4b) and f6854 (serotype 1/2a), to organic acid, under conditions controlling for osmotic and cold stress. Strains were exposed to BHI broth at 7°C with 4.65% water phase (w.p.) NaCl at pH 6.1 treated with 2% w.p. potassium lactate, 0.14% w.p. sodium diacetate, the combination of both at the same levels, or no inhibitors as control. RNA was extracted 8h after exposure, during lag phase, to capture gene expression changes during adaptation to the organic acid stress. Treatment with organic acids induced massive global transcriptional changes, with 1041 and 640 genes differentially expressed in h7858 and f6854. Major effects of treatment with lactate and diacetate are (i) a total of 474 and 209 genes, for h7858 and f6854, that showed synergistic expression differences, (ii) differential expression of membrane ion transport genes including those encoding ABC transporters of metals and decreased multi-drug transporter expression many ABC, PTS, and drug transporter systems, including increased PTS sugar transport and decreased multi-drug transporter expression, and (iii) altered metabolism including induction of a nutrient limiting stress response, reduction of menaquinone biosynthesis, and a shift from fermentative production of lactate and acetate and lactate to energetically less favorable, neutral acetoin. These data suggest that additional synergies in L. monocytogenes growth inhibition could be achieved by treatments that interfere with cellular energy generation processes.
2011-11-03 | GSE25195 | GEO
Project description:Transcriptional consequences of DNA gyrase inhibition
| PRJNA94637 | ENA
Project description:Fibroblast to myofibroblast differentiation is crucial for the initial healing response but excessive myofibroblast activation leads to pathological fibrosis. Therefore, it is imperative to understand the mechanisms underlying myofibroblast formation. Here we report that mitochondrial calcium (mCa2+) signaling is a regulatory mechanism in myofibroblast differentiation and fibrosis. We demonstrate that inhibition of mCa2+ uptake in fibroblasts enhances myofibroblast formation and this translates to increased fibrosis following injury. Fibrotic signaling alters the gating of the mitochondrial calcium uniporter (mtCU) to reduce mCa2+ uptake and induce specific changes in metabolism. mCa2+-dependent metabolic reprogramming leads to the activation of αKG-dependent demethylases which epigenetically modify promoter regions specific to the myofibroblast gene program resulting in differentiation. Our results uncover an important role for mCa2+ uptake beyond metabolic regulation and cell death and demonstrate that mCa2+ signaling regulates the epigenome to influence cellular differentiation.
2019-08-22 | GSE135530 | GEO
Project description:The balance between glycolytic and oxidative metabolism shifts during differentiation of human embryonic stem cells (hESCs) and during reprogramming of somatic cells into pluripotent stem cells. However the contribution of glycolytic metabolism to various stages of pluripotency is not well understood. Additionally, few tools have been developed that modulate pluripotent stem cell glycolytic metabolism to influence self-renewal or differentiation. Here we show that the degree of human pluripotency is associated with glycolytic rate, whereby naive hESCs exhibit higher glycolytic flux, increased MYC transcriptional activity, and elevated nuclear N-MYC levels relative to primed hESCs. Consistently, the inner cell mass of human blastocysts also exhibits increased MYC transcriptional activity relative to primed hESCs and elevated nuclear N-MYC levels. Expression of the lactate transporter, monocarboxylate transporter 1 (MCT1), is strongly associated with the pluripotent state, and reduction of glycolysis using a small molecule inhibitor towards MCT1 decreases self-renewal of naïve hESCs and feeder-free cultured primed hESCs, but not that of primed hESCs grown in feeder-supported conditions. Lastly, reduction of glycolytic metabolism via MCT1 inhibition in feeder-free primed hESCs enhances neural lineage specification. These findings validate the association between glycolytic metabolism and pluripotency, reveal differences in the glucose metabolism of feeder- versus feeder-free cultured hESCs, and show that pharmacologic regulation of glycolysis can influence self-renewal and initial cell fate specification of human pluripotent stem cells.
2016-08-16 | GSE83491 | GEO
Project description:Higher 13C-lactate labeling was seen in the more aggressive tumors, including all triple negative breast cancers. There was a significant correlation between lactate labeling and expression of the monocarboxylate transporter (MCT1), which mediates tumor cell pyruvate uptake, and a weaker correlation with expression of LDHA, which catalyzes label exchange between the injected pyruvate and the endogenous lactate pool.
| EGAS00001004118 | EGA
Project description:Inflammatory skin diseases are spurred by unchecked immune-epithelial circuits. Although the function of cytokine and chemokine signals in facilitating this crosstalk is well established, the specific metabolic mediators involved and their simultaneous contribution to dysregulation of these two distinct cellular compartments is unclear. Here, we employed scRNA-seq, spatial transcriptomics, and immunofluorescence across multiple disease indications to elucidate a dysfunctional epithelial state marked by Hypoxia Inducible Factor 1 alpha (HIF1⍺). Ex vivo HIF1⍺ blockade of human Psoriasis (PsO) lesions led to a reduction in pathological gene expression via modulation of glucose metabolism. Epidermal-specific loss of HIF1⍺ or its transcriptional target, glucose transporter 1, curtailed both epidermal pathology and the cutaneous immune response in murine PsO. Glycolytic metabolism sustained epithelial hyperproliferation and differentiation, while lactate, its terminal product, was crucial for sustaining Type 17 response. Notably, inhibition of lactate dehydrogenase A or the lactate transporters MCT1/4 selectively attenuated the Type 17 response, underscoring a divergent requirement for glucose and lactate in epithelial and immune cells, respectively. Collectively, these findings identify therapeutically targetable immune-epithelial circuits by unveiling a remarkable coordination of metabolic processed between the epithelial and immune compartments in inflammatory skin disease.
2024-04-01 | GSE237767 | GEO