Počet záznamů: 1
Lithocholic acid inhibits P2X2 and potentiates P2X4 receptor channel gating
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SYSNO ASEP 0532987 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Lithocholic acid inhibits P2X2 and potentiates P2X4 receptor channel gating Tvůrce(i) Sivčev, Sonja (FGU-C) RID, ORCID
Slavíková, Barbora (UOCHB-X) RID, ORCID
Ivetic, Milorad (FGU-C) RID, ORCID
Knězů, Michal (FGU-C) RID
Kudová, Eva (UOCHB-X) RID, ORCID
Zemková, Hana (FGU-C) RID, ORCIDČíslo článku 105725 Zdroj.dok. Journal of Steroid Biochemistry and Molecular Biology. - : Elsevier - ISSN 0960-0760
Roč. 202, Sep (2020)Poč.str. 15 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova ATP ; purinergic P2X receptors ; bile acids ; lithocholic acid ; ivermectin ; allosteric modulation Vědní obor RIV FH - Neurologie, neurochirurgie, neurovědy Obor OECD Neurosciences (including psychophysiology Vědní obor RIV – spolupráce Ústav organické chemie a biochemie - Neurologie, neurochirurgie, neurovědy CEP GA18-05413S GA ČR - Grantová agentura ČR LQ1604 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy ED1.1.00/02.0109 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora FGU-C - RVO:67985823 ; UOCHB-X - RVO:61388963 UT WOS 000568822300006 EID SCOPUS 85089244463 DOI https://doi.org/10.1016/j.jsbmb.2020.105725 Anotace The family of ATP-gated purinergic P2X receptors comprises seven bunits (P2X1-7) that are unevenly distributed in the central and peripheral nervous systems as well as other organs. Endogenous modulators of P2X receptors are phospholipids, steroids and neurosteroids. Here, we analyzed whether bile acids, which are natural products derived from cholesterol, affect P2X receptor activity. We examined the effects of primary and secondary bile acids and newly synthesized derivatives of lithocholic acid on agonist-induced responses in HEK293T cells expressing rat P2X2, P2X4 and P2X7 receptors. Electrophysiology revealed that low micromolar concentrations of lithocholic acid and its structural analog 4-dafachronic acid strongly inhibit ATP-stimulated P2X2 but potentiate P2X4 responses, whereas primary bile acids and other secondary bile acids exhibit no or reduced effects only at higher concentrations. Agonist-stimulated P2X7 responses are significantly potentiated by lithocholic acid at moderate concentrations. Structural modifications of lithocholic acid at positions C-3, C-5 or C-17 abolish both inhibitory and potentiation effects to varying degrees, and the 3 alpha-hydroxy group contributes to the ability of the molecule to switch between potentiation and inhibition. Lithocholic acid allosterically modulates P2X2 and P2X4 receptor sensitivity to ATP, reduces the rate of P2X4 receptor desensitization and antagonizes the effect of ivermectin on P2X4 receptor deactivation. Alanine-scanning mutagenesis of the upper halve of P2X4 transmembrane domain-1 revealed that residues Phe48, Val43 and Tyr42 are important for potentiating effect of lithocholic acid, indicating that modulatory sites for lithocholic acid and ivermectin partly overlap. Lithocholic acid also inhibits ATP-evoked currents in pituitary gonadotrophs expressing native P2X2, and potentiates ATP currents in nonidentified pituitary cells expressing P2X4 receptors. These results indicate that lithocholic acid is a bioactive steroid that may help to further unveil the importance of the P2X2, and P2X4 receptors in many physiological processes. Pracoviště Fyziologický ústav Kontakt Lucie Trajhanová, lucie.trajhanova@fgu.cas.cz, Tel.: 241 062 400 Rok sběru 2021 Elektronická adresa https://doi.org/10.1016/j.jsbmb.2020.105725
Počet záznamů: 1