Download MendeleyDiscovery and structural basis of endogenous and exogenous inhibitors of the proton-activated-chloride channel.
Zhang, H., Zhao, Z., Chen, X., Ma, Q., Zhen, W., Xu, Q., Wang, Y., He, B., Huang, Y., Xu, P., Xu, H., Lu, Z., Su, N., Yang, F.(2025) Cell Rep 44: 115998-115998
- PubMed: 40664207
- DOI: https://doi.org/10.1016/j.celrep.2025.115998
- Primary Citation of Related Structures:
8ZLB, 8ZLL, 9LHM, 9LI2 - PubMed Abstract:
The proton-activated chloride (PAC) channel is a broadly expressed chloride channel that senses extracellular acidification, regulates endosomal acidification, and participates in many processes, including acid-induced cell death and cancer cell migration. However, the lack of specific modulators has limited our understanding of its function and therapeutic potential. Here, we discovered that endogenous cholesterol (CHL) partially inhibits PAC channel activation. Moreover, we identified a series of CHL analogs and structurally related dyes as full antagonists of the PAC channel, with deoxycholic acid (DCA) and Evans blue (EB) as their representative compounds. By combining cryo-electron microscopy (cryo-EM) and patch-clamp recordings, we revealed the distinct binding and inhibition mechanisms of DCA and EB on this channel. Moreover, in malignant osteosarcoma cells, where PAC channel expression is upregulated, EB inhibited the migration and invasion of these cells. Therefore, we identified DCA and EB as pharmacological tools for the PAC channel, which forms a basis for future drug discovery targeting this channel.
- Liangzhu Laboratory, Zhejiang University Medical Center, Zhejiang University School of Medicine, Hangzhou, Zhejiang 311112, China; Kidney Disease Center of the First Affiliated Hospital and Department of Biophysics, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province 310058, China; Alibaba-Zhejiang University Joint Research Center of Future Digital Healthcare, Hangzhou, Zhejiang 310058, China.
Organizational Affiliation:
