The Adhesion GPCR ADGRL2 engages Galpha13 to Enable Epidermal Differentiation
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PROVIDER: PRJNA1303752 | ENA |
REPOSITORIES: ENA
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Project description:The Adhesion GPCR ADGRL2 engages Galpha13 to Enable Epidermal Differentiation
| PRJNA1303753 | ENA
Project description:Homeostasis relies on signaling networks controlled by cell membrane receptors. Although G-protein-coupled receptors (GPCRs) are the largest family of transmembrane receptors, their specific roles in the epidermis are not fully understood. Dual CRISPR-Flow and single cell Perturb-seq knockout screens of all epidermal GPCRs were thus performed, uncovering an essential requirement for adhesion GPCR ADGRL2 (latrophilin 2) in epidermal differentiation. Among potential downstream guanine nucleotide-binding G proteins, ADGRL2 selectively activated Gα13. Perturb-seq of epidermal G proteins and follow-up tissue knockouts verified that Gα13 is also required for epidermal differentiation. A cryo-electron microscopy (cryo-EM) structure in lipid nanodiscs showed that ADGRL2 engages with Gα13 at multiple interfaces, including via a novel interaction between ADGRL2 intracellular loop 3 (ICL3) and a Gα13-specific QQQ glutamine triplet sequence in its GTPase domain. In situ gene mutation of this interface sequence impaired epidermal differentiation, highlighting an essential new role for an ADGRL2-Gα13 axis in epidermal differentiation.
| S-EPMC11888183 | biostudies-literature
Project description:Latrophilin 2 (ADGRL2), an adhesion GPCR, mediates signaling through its intracellular loop 3 via a unique QQQ binding patch within the Gα13 GTPase domain, playing a critical role in the regulation of normal epidermal differentiation.
2025-03-19 | GSE281860 | GEO
Project description:The GPCR Latrophilin2 Signals via Gα13 to Regulate Epidermal Differentiation
| PRJNA1186065 | ENA
Project description:Data for Alternative Splicing of Adhesion-GPCR Latrophilin-3 Controls Synapse Formation
| PRJNA1005253 | ENA
Project description:Adhesion GPCR ADGRE2 maintains proteostasis to promote progression in acute myeloid leukemia
| PRJNA1087687 | ENA
Project description:In this study, we use the epidermis as a model system to elucidate the cellular effects and signaling feedback sequelae of mTORC1 loss-of-function in epithelial tissue. In mice with conditional epidermal loss of mTORC1 components Rheb or Rptor, we find that mTORC1 loss-of-function unexpectedly results in a profound skin barrier defect with epidermal abrasions, blistering and early postnatal lethality, due to a thinned epidermis with decreased desmosome expression and incomplete biochemical differentiation. Impaired cell-cell adhesion in the context of mTORC1 loss-of-function is caused by constitutive activation of Rho kinase (ROCK) signaling with increased cytoskeletal tension, and inhibition or silencing of ROCK1 is sufficient to rescue keratinocyte adhesion and biochemical differentiation. mTORC1 loss-of-function results in marked feedback up-regulation of upstream TGF-β signaling, triggering ROCK activity and its downstream effects on desmosomal gene expression. These findings elucidate a novel role for mTORC1 in the regulation of epithelial barrier formation, cytoskeletal tension and cell adhesion and underscore the complexity of signaling feedback after mTORC1 inhibition
2020-04-14 | GSE102026 | GEO
Project description:How synapses are assembled and specified in brain is incompletely understood. Latrophilin-3, a postsynaptic adhesion-GPCR, mediates Schaffer-collateral synapse formation in the hippocampus but the mechanisms involved remained unclear. Here we show that Latrophilin-3 organizes synapses by a convergent dual-pathway mechanism by which Latrophilin-3 simultaneously activates GaS/cAMP-signaling and recruits phase-separated postsynaptic protein scaffolds. We found that cell type-specific alternative splicing of Latrophilin-3 controls its G protein coupling mode, resulting in Latrophilin-3 variants that predominantly signal via Gas and cAMP or via Gα12/13. A CRISPR-mediated genetic switch of Latrophilin-3 alternative splicing from a GaS- to a Gα12/13-coupled mode impaired synaptic connectivity similar to the overall deletion of Latrophilin-3, suggesting that GaS/cAMP-signaling by Latrophilin-3 splice variants mediates synapse formation. Moreover, GaS- but not Gα12/13-coupled splice variants of Latrophilin-3 recruit phase-transitioned postsynaptic protein scaffolds that are clustered by binding of presynaptic Latrophilin-3 ligands. Strikingly, neuronal activity promotes alternative splicing of the synaptogenic variant of Latrophilin-3, thereby enhancing synaptic connectivity. Together, these data suggest that activity-dependent alternative splicing of a key synaptic adhesion molecule controls synapse formation by parallel activation of two convergent pathways, GaS/cAMP signaling and the phase separation of postsynaptic protein scaffolds.
2023-10-19 | GSE240791 | GEO
Project description:Adhesion GPCR CD97 promotes spleen dendritic cell retention and function through sensing of CD55-expressing red blood cells
| PRJNA780483 | ENA
Project description:Acute myeloid leukemia (AML) is an aggressive and heterogenous hematological malignancy. In elderly patients, AML incidence is high and has a poor prognosis due to a lack of effective therapies. G-protein coupled receptors (GPCRs) play integral roles in physiological processes and human diseases. Particularly, one-third of adhesion GPCRs, the second largest group of GPCRs, are highly expressed in hematopoietic stem and progenitor cells or lineage cells. Therefore, we investigated the role of adhesion GPCRs in AML and whether they could be harnessed as anti-leukemia targets. Systematic screening of the impact of adhesion GPCRs on AML functionality by combined bioinformatic and functional analyses revealed high expression of ADGRE2 in AML, particularly in leukemic stem cells (LSCs), which was associated with poor patient outcomes. Silencing ADGRE2 not only exerted anti-leukemia effects in AML cell lines and AML patient-derived cells in vitro but also delayed AML progression in xenograft models in vivo. Mechanistically, ADGRE2 activated PLC-β/PKC/MEK/ERK signaling to enhance expression of AP-1 and transcriptionally drive expression of DUSP1, a protein phosphatase. DUSP1 de-phosphorylated Ser16 in the J-domain of the co-chaperone DNAJB1, which facilitated DNAJB1-HSP70 interaction and maintenance of proteostasis in AML. Finally, combined inhibition of MEK, AP-1, and DUSP1 exhibited robust therapeutic efficacy in AML xenograft mouse models. Collectively, this study deciphers the roles and mechanisms of ADGRE2 in AML and provides a promising therapeutic strategy for treating AML.
2024-03-19 | GSE261574 | GEO