ML365 inhibits TWIK2 channel to block ATP-induced NLRP3 inflammasome

Xiao-yan Wu, Jin-yan Lv, Shiqing ZHANG, Xin Yi, Zi-wei Xu, Yuan-xing Zhi, Bo-xin Zhao, Jianxin Pang, Kin Lam Yung*, Shu-wen Liu*, Ping-zheng Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Dysregulation of NLRP3 inflammasome results in uncontrolled inflammation, which participates in various chronic diseases. TWIK2 potassium channel mediates potassium efflux that has been reported to be an essential upstream mechanism for ATP-induced NLRP3 inflammasome activation. Thus, TWIK2 potassium channel could be a potential drug target for NLRP3-related inflammatory diseases. In the present study we investigated the effects of known K2P channel modulators on TWIK2 channel expressed in a heterologous system. In order to increase plasma membrane expression and thus TWIK2 currents, a mutant channel with three mutations (TWIK2I289A/L290A/Y308A) in the C-terminus was expressed in COS-7 cells. TWIK2 currents were assessed using whole-cell voltage-clamp recording. Among 6 known K2P channel modulators tested (DCPIB, quinine, fluoxetine, ML365, ML335, and TKDC), ML365 was the most potent TWIK2 channel blocker with an IC50 value of 4.07 ± 1.5 μM. Furthermore, ML365 selectively inhibited TWIK2 without affecting TWIK1 or THIK1 channels. We showed that ML365 (1, 5 μM) concentration-dependently inhibited ATP-induced NLRP3 inflammasome activation in LPS-primed murine BMDMs, whereas it did not affect nigericin-induced NLRP3, or non-canonical, AIM2 and NLRC4 inflammasomes activation. Knockdown of TWIK2 significantly impaired the inhibitory effect of ML365 on ATP-induced NLRP3 inflammasome activation. Moreover, we demonstrated that pre-administration of ML365 (1, 10, 25 mg/kg, ip) dose-dependently ameliorated LPS-induced endotoxic shock in mice. In a preliminary pharmacokinetic study conducted in rats, ML365 showed good absolute oral bioavailability with F value of 22.49%. In conclusion, ML365 provides a structural reference for future design of selective TWIK2 channel inhibitors in treating related inflammatory diseases.
Original languageEnglish
Pages (from-to)992–1000
Number of pages9
JournalActa Pharmacologica Sinica
Volume43
Issue number4
Early online date2 Aug 2021
DOIs
Publication statusPublished - Apr 2022

Scopus Subject Areas

  • Pharmacology, Toxicology and Pharmaceutics(all)
  • Neuroscience(all)

User-Defined Keywords

  • TWIK2
  • K2P channels
  • NLRP3
  • inflammasome
  • innate immunity
  • inflammatory diseases

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