Aphanius farsicus strain:Barmeshoor Spring-Stream
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ABSTRACT:
PROVIDER: PRJNA203358 | ENA |
REPOSITORIES: ENA
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Project description:Kappa Opioid receptors（KORs） belong to family A of G-protein–coupled receptors (GPCRs), and the involvement of their ligands in analgesia and sedation has been extensively studied. KORs, which are expressed in the central and peripheral nervous systems are well known to exert potent anti-nociceptive effects by negatively modulating excitatory neurotransmission. The present study reveals that acute activation of KOR weaken SERT function via protein kinase B/Akt (Akt) and calcium calmodulin dependent kinase II (CaMKII) dependent signaling pathways. Therefore, studying phosphorylation will be helpful to elucidate the cellular mechanisms and downstream effector(s). Studies correlating the dysphoric effects of KOR agonists to the G-protein–independent activation of the p38 MAPK pathway suggest that identification of KOR agonists biased to G-protein–mediated signaling could lead to the development of therapeutics with reduced side effects. Therefore, to better understand the cellular mechanisms and downstream effector(s) by which KOR ligands produce these effects, we employed dimethyl labeling quantitative proteomic approach in this study. In this study, three monoclonal HEK293T cell lines with KOR over-expression were successfully constructed as our experimental models. Then, mass spectrometry-based quantitative approach, based on dimethyl labeling and TiO2 beads-coupled phosphopeptides enrichment, was utilized to analyze the KOR-mediated dynamic phosphorylation network in these three KOR-over-expressed monoclonal cell lines disturbed by LPK-26 or U50,488 treatments. Further Substrate-kinase prediction analysis of 212 up-regulated phosphosites indicated that 18 kinases, such as AKT1 and p70S6K, were involved in the up-regulation of KOR phosphorylation. The up-regulated phosphorylation of AKT1 and p70S6K were further confirmed by western blot, which was consistent with our mass spectrometry results. In summary, quantitative phosphoproteomic study of KOR-over-expressed cells upon agonist stimulation paves the way to systematical investigation of KOR-mediated phosphorylation network dynamics, which will be helpful to research about targeted therapy of KOR related diseases and mechanism study of analgesia addiction.
2022-02-23 | PXD008349 | Pride