Neurotensin regulates proliferation and stem cell function in the small intestine in a nutrient-dependent manner
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ABSTRACT:
PROVIDER: PRJNA758022 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
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| SRR15619232.fastq.gz | Fastqsanger.gz | |||
| SRR15619233.fastq.gz | Fastqsanger.gz | |||
| SRR15619234.fastq.gz | Fastqsanger.gz | |||
| SRR15619235.fastq.gz | Fastqsanger.gz | |||
| SRR15619236.fastq.gz | Fastqsanger.gz |
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Project description:Background & Aims: Intestinal stem cells (ISCs) are sensitive to dietary alterations and nutrient availability. Neurotensin (NT), a gut peptide localized predominantly to the small bowel and released by fat ingestion, stimulates the growth of intestinal mucosa under basal conditions and during periods of nutrient deprivation, suggesting a possible role for NT on ISC function. Methods: Lgr5-EGFP, NT wild type (Nt+/+) and Lgr5-EGFP, NT knockout (Nt-/-) mice were fed ad libitum (AL) or fasted for 48 h. Small intestine crypts were examined by RNAseq analysis. Results: Loss of NT impaired crypt cell proliferation and ISC function in a manner dependent on nutrient status. Under nutrient-rich conditions, NT stimulated the expression of genes that promote cell cycle progression, leading to crypt cell proliferation. Under conditions of nutrient depletion, NT stimulated WNT/β-catenin signaling and promoted an ISC gene signature, leading to enhanced ISC function. NT was required for the induction of WNT/β-catenin signaling and ISC-specific gene expression during nutrient depletion, and loss of NT reduced crypt cell proliferation and impaired ISC function and Lgr5 expression in the intestine during fasting. Conclusion: Collectively, our findings establish an evolutionarily conserved role for NT in ISC maintenance during nutritional stress.
2021-09-29 | GSE182828 | GEO
Project description:Background & aimsIntestinal stem cells (ISCs) are sensitive to dietary alterations and nutrient availability. Neurotensin (NT), a gut peptide localized predominantly to the small bowel and released by fat ingestion, stimulates the growth of intestinal mucosa under basal conditions and during periods of nutrient deprivation, suggesting a possible role for NT on ISC function.MethodsLeucine-rich repeat-containing G-protein coupled receptor 5-Enhanced Green Fluorescent Protein (Lgr5-EGFP) NT wild type (Nt+/+) and Lgr5-EGFP NT knockout (Nt-/-) mice were fed ad libitum or fasted for 48 hours. Small intestine tissue and crypts were examined by gene expression analyses, fluorescence-activated cell sorting, Western blot, immunohistochemistry, and crypt-derived organoid culture. Drosophila expressing NT in midgut enteroendocrine cells were fed a standard diet or low-energy diet and esg-green fluorescent protein+ ISCs were quantified via immunofluorescence.ResultsLoss of NT impaired crypt cell proliferation and ISC function in a manner dependent on nutrient status. Under nutrient-rich conditions, NT stimulated extracellular signal-regulated kinases 1 and 2 signaling and the expression of genes that promote cell-cycle progression, leading to crypt cell proliferation. Under conditions of nutrient depletion, NT stimulated WNT/β-catenin signaling and promoted an ISC gene signature, leading to enhanced ISC function. NT was required for the induction of WNT/β-catenin signaling and ISC-specific gene expression during nutrient depletion, and loss of NT reduced crypt cell proliferation and impaired ISC function and Lgr5 expression in the intestine during fasting. Conversely, the expression of NT in midgut enteroendocrine cells of Drosophila prevented loss of ISCs during nutrient depletion.ConclusionsCollectively, our findings establish an evolutionarily conserved role for NT in ISC maintenance during nutritional stress. GSE182828.
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Project description:The conformational ensembles of G-protein coupled receptors (GPCRs) include inactive and active states. Spectroscopy techniques, including NMR, show that agonists, antagonists and other ligands shift the ensemble toward specific states depending on the pharmacological efficacy of the ligand. How receptors recognize ligands and the kinetic mechanism underlying this population shift is poorly understood. Here, we investigate the kinetic mechanism of neurotensin recognition by neurotensin receptor 1 (NTS1) using 19F-NMR, hydrogen-deuterium exchange mass spectrometry and stopped-flow fluorescence spectroscopy. Our results indicate slow-exchanging conformational heterogeneity on the extracellular surface of ligand-bound NTS1. Numerical analysis of the kinetic data of neurotensin binding to NTS1 shows that ligand recognition follows an induced fit mechanism, in which conformational changes occur after neurotensin binding. This approach is applicable to other GPCRs to provide insight into the kinetic regulation of ligand recognition by GPCRs.
2023-12-09 | PXD045464 | Pride
Project description:Neurotensin(NTS), a gut hormone, is known to impact whole body energy metabolism. Here we investigated the impact of neurotensin on the liver in fed (ad libitum) and fasted (22h) female mice livers from NTS wild type (WT) and knockout (KO) mice. Our goal was to investigate the regulation of energy metabolism pathways in the liver that are regulated by neurotensin, specifically lipid uptake and mitochondrial metabolism.
2025-04-30 | GSE290723 | GEO
Project description:Nutrition has a vital role in shaping the intestinal microbiome. The impact of nutrients and the consequences of enteral deprivation on the small intestinal mucosal microbiota, specifically in early life, has not been well described. Our aim was to study the impact of enteral deprivation on the small intestine mucosal microbiome and to search for factors that shape this interaction in early life. Host seem to be the most dominant factor in the structure of the early life mucosal microbial small intestine community. Under conditions of nutrient deprivation, there are specific changes in host proteomics. Further research is needed to better define and understand this host-microbe-nutrition interaction in the small intestine.
2024-07-16 | PXD044961 | Pride
Project description:The adult intestine is a regionalized organ, whose size and cellular composition is adjusted in response to nutrient status. This involves dynamic regulation of intestinal stem cell (ISC) proliferation and differentiation. How nutrient signaling integrates with mechanisms controlling cell fate to achieve regional changes in intestinal cell composition remains unclear. Here we show that nutrient adaptation involves highly region-specific control of intestinal cell size, number and differentiation. Our data uncovered a mechanism by which mTOR complex 1 activation increases ISC size in a region-specific manner. This promotes Delta expression to direct cell fate towards the absorptive enteroblast lineage, while inhibiting secretory enteroendocrine cell differentiation. Thus, ISC size acts as an early fate determinant allowing regional control of intestinal cell differentiation in response to nutrition.
2024-02-14 | GSE222254 | GEO
Project description:Neurotensin-Neurotensin Receptor 2 signaling in adipocytes regulates food intake through ceramide metabolism
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Project description:Calorie-rich foods, particularly those high in fat and sugar, evoke pleasure in both humans and animals. However, prolonged consumption of such foods may reduce their hedonic value, potentially contributing to obesity. Here, we investigated this phenomenon in mice on a chronic high-fat diet (HFD). While these mice preferred high-fat food over regular chow in their home cages, they showed reduced interest in calorie-rich foods in a no-effort setting. This paradoxical decrease in hedonic feeding has been reported previously, but its neurobiological basis remains unclear. We found that in regular diet mice, neurons in the lateral nucleus accumbens projecting to the ventral tegmental area (NAcLat→VTA) encoded hedonic feeding behaviors. In HFD mice, this behavior was reduced and uncoupled from neural activity. Optogenetic stimulation of the NAcLat→VTA pathway increased hedonic feeding in regular diet mice but not in HFD mice, though this behavior was restored when HFD mice returned to a regular diet. HFD mice exhibited reduced neurotensin expression and release in the NAcLat→VTA pathway. Furthermore, neurotensin knockout in the NAcLat and neurotensin receptor blockade in the VTA each abolished optogenetic-induced hedonic feeding behavior. Enhancing neurotensin signaling via overexpression normalized aspects of diet-induced obesity, including weight gain and hedonic feeding. Altogether, our findings identify a neural circuit mechanism linking the devaluation of hedonic foods with obesity.
2025-03-27 | GSE287548 | GEO
Project description:The lateral septum contains a number of molecularly defined cell populations. We used the viral-TRAP protocol (Nectow et al.,2017) to profile lateral septum neurotensin neurons.
2020-08-30 | GSE154758 | GEO