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https://www.selleckchem.com/products/pf-07321332.html In silico binding simulations identify several potential binding sites for citicoline on 20S proteasome, and their topology envisages the possibility that, by occupying some of these pockets, citicoline may induce a conformational shift of the 20S proteasome, allowing to sketch a working hypothesis for the structural basis of its function as allosteric modulator. In addition, we show that over the same concentration range citicoline affects the distribution of assembled proteasome populations and turn-over of ubiquitinated proteins in SH-SY5Y and SK-N-BE human neuroblastoma cells, suggesting its potential role as a regulator of proteostasis in nervous cells. The remarkable effects exhibited by classical psychedelics in recent clinical trials have spawned considerable interest in 5-HT2A receptor (5-HT2AR) activation as a treatment strategy for several psychiatric/cognitive disorders. In this study we have continued our development of 25CN-NBOH, one of the most 5-HT2AR-selective agonists reported to date, as a pharmacological tool for exploration of 5-HT2AR expression and functions. The importance of the 2' and 3' positions in 25CN-NBOH as structural hotspots for its 5-HT2AR activity was investigated by synthesis and pharmacological characterization of six novel analogs at 5-HT2AR and 5-HT2CR in binding and functional assays. While the 5-HT2AR activity of 25CN-NBOH was retained in 3'-methyl, 2',3'-chroman, 2',3'-dihydrofuran and 2',3'-furan analogs, the 3'-methoxy and 3'-ethyl analogs displayed substantially lower binding affinities and agonist potencies than 25CN-NBOH. Interestingly, the 2',3'-substitution pattern was also a key determinant of agonist efficacy, asvity in 25CN-NBOH, substantiates the potential in this compound and its analogs as tools for in vivo studies of 5-HT2AR, and introduces a novel selective agonist radioligand as another potentially valuable tool for future explorations of this receptor. MO

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