Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA246152 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:G protein-coupled receptors (GPCRs) are well known to signal via cyclic AMP (cAMP) production at the plasma membrane, but it is now clear that various GPCRs also signal after internalization. Apart from its temporal impact through prolonging the cellular response, we wondered if the endosome-initiated signal encodes any discrete spatial information. Using the beta2-adrenoceptor (β2-AR) as a model, we show that endocytosis is required for the full repertoire of downstream cAMP-dependent transcriptional control. Next, we describe an orthogonal optogenetic approach to definitively establish that the location of cAMP production is indeed the critical variable determining the transcriptional response. Finally, our results suggest that this spatial encoding scheme helps cells functionally discriminate chemically distinct β2-AR ligands according to differences in their ability to promote receptor endocytosis. These findings reveal a discrete principle for achieving cellular signalling specificity, based on endosome-mediated spatial encoding of intracellular second messenger production and 'location aware' downstream transcriptional control.
2014-11-01 | GSE57274 | GEO
Project description:Beta-hydroxybutyrate (BHB) is a ketone body synthesized during fasting or strenuous exercise. Our previous study demonstrated that a cyclic ketogenic diet (KD), which induces BHB levels similar to fasting every other week, reduces midlife mortality and improves memory in aging mice. BHB actively regulates gene expression and inflammatory activation through non-energetic signaling pathways. Neither of these activities has been well-characterized in the brain and they may represent mechanisms by which BHB affects brain function during aging. First, we analyzed hepatic gene expression in an aging KD-treated mouse cohort using bulk RNA-seq. In addition to the downregulation of TOR pathway activity, cyclic KD reduces inflammatory gene expression in the liver. We observed via flow cytometry that KD also modulates age-related systemic T cell functions. Next, we investigated whether BHB affects brain cells transcriptionallyin vitro. Gene expression analysis in primary human brain cells (microglia, astrocytes, neurons) using RNA-seq shows that BHB causes a mild level of inflammation in all three cell types. However, BHB inhibits the more pronounced LPS-induced inflammatory gene activation in microglia. Furthermore, we confirmed that BHB similarly reduces LPS-induced inflammation in primary mouse microglia and bone marrow-derived macrophages (BMDMs). BHB is recognized as an inhibitor of histone deacetylase (HDAC), an inhibitor of NLRP3 inflammasome, and an agonist of the GPCR Hcar2. Nevertheless, in microglia, BHB's anti-inflammatory effects are independent of these known mechanisms. Finally, we examined the brain gene expression of 12-month-old male mice fed with one-week and one-year cyclic KD. While a one-week KD increases inflammatory signaling, a one-year cyclic KD reduces neuroinflammation induced by aging. In summary, our findings demonstrate that BHB mitigates the microglial response to inflammatory stimuli, like LPS, possibly leading to decreased chronic inflammation in the brain after long-term KD treatment in aging mice.
2024-01-31 | GSE252513 | GEO
Project description:GPCR endocytosis confers uniformity in responses to chemically distinct ligands
| PRJNA344802 | ENA
Project description:Many G protein-coupled receptors (GPCRs) trigger a second phase of G protein-dependent signaling from internal membranes after agonist-induced endocytosis. However, individual GPCRs differ significantly in their ability to internalize after activation, and it remains unclear if this confers selectivity on cellular signaling through natively coexpressed GPCRs. We addressed this question by examining the activation of the cyclic AMP (cAMP) / cAMP-dependent protein kinase (PKA) pathway by three ligands that stimulate three distinct, endogenously coexpressed GPCRs in HEK293 cells: isoproterenol (Iso) which primarily activates the β2-adrenergic receptor (β2AR), vasoactive intestinal peptide (VIP) which primarily activates the vasoactive intestinal peptide receptor 1 (VIPR1/VPAC1), and 5'-N-ethylcarboxamidoadenosine (NECA) which primarily activates the adenosine 2B receptor (A2BR). Using location-targeted biosensors and a transcriptional reporter, we demonstrate that each ligand triggers a unique cellular signaling profile and that these responses are differentially sensitive to endocytic inhibition. VIP elicited a response that was endocytosis-dependent at every level in the pathway tested, from upstream global cAMP elevation to downstream activation of nuclear PKA, while Iso elicited a response that was dependent on endocytosis selectively at downstream steps. In contrast, NECA robustly activated the entire cAMP signaling cascade independently of endocytosis, consistent with our observation that human A2BR does not robustly internalize after activation. We conclude that endocytosis indeed sculpts downstream cAMP signaling by GPCRs in a receptor-specific manner. Our results add to the evolving view of compartmentalized signaling in the cAMP / PKA pathway and suggest that differences in GPCR trafficking can encode receptor-specific signaling profiles through a shared signal transduction pathway.
2025-02-24 | GSE290019 | GEO
Project description: Not available
| S-EPMC2531291 | biostudies-literature
Project description:RNA extracted at 240min. Samples are rRNA depleted. Expression measurement of Homo sapiens genes.
2019-07-31 | GSE114179 | GEO
Project description:Virus infection may induce excessive interferon (IFN) responses that can lead to host tissue injury or even death. β-arrestin 2 regulates multiple cellular events through the G protein-coupled receptor (GPCR) signaling pathways. Here we demonstrate that β-arrestin 2 also promotes virus-induced production of IFN-β and clearance of viruses in macrophages. β-arrestin 2 interacts with cyclic GMP-AMP synthase (cGAS) and increases the binding of dsDNA to cGAS to enhance cyclic GMP-AMP (cGAMP) production and the downstreatm stimulator of interferon genes (STING) and innate immune responses. Mechanistically, deacetylation of β-arrestin 2 at Lys171 facilitates the activation of the cGAS–STING signaling and the production of IFN-β. In vitro, viral infection induces the degradation of β-arrestin 2 to facilitate immune evasion, while a β-blocker, carvedilol, rescues β-arrestin 2 expression to maintain the antiviral immune response. Our results thus identify a viral immune-evasion pathway via the degradation of β-arrestin 2, and also hint that carvedilol, approved for treating heart failure, can potentially be repurposed as an antiviral drug candidate.
2020-10-22 | GSE159735 | GEO
Project description:Expression of Cyclic AMP associated genes on primary culture human myometrial cells
| PRJNA305399 | ENA
Project description: Not available
| S-EPMC4686780 | biostudies-literature
Project description: Not available
| S-EPMC3743458 | biostudies-literature