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-Structure paper
| タイトル | Development of a clinically viable MRGPRX4 inverse agonist for cholestatic itch treatment. |
|---|---|
| ジャーナル・号・ページ | Nat Chem Biol, Year 2026 |
| 掲載日 | 2026年4月9日 |
著者 | Jun Yang / Ruichao Shen / Chunyu Wang / Wenneng Zhu / Han Ke / Junping Fan / Mengna Zhang / Yingjun Liu / Shuai Li / Guochuan Li / Xiaoming Wang / Yulong Li / Can Cao / Xiaoguang Lei / ![]() |
| PubMed 要旨 | Chronic itch, particularly in cholestatic and uremic conditions, poses a notable clinical burden, yet treatment options remain inadequate. MRGPRX4 (hX4), a bile-acid-sensing G-protein-coupled ...Chronic itch, particularly in cholestatic and uremic conditions, poses a notable clinical burden, yet treatment options remain inadequate. MRGPRX4 (hX4), a bile-acid-sensing G-protein-coupled receptor predominantly expressed in human sensory neurons, has emerged as a critical mediator of cholestatic pruritus. Here we identified and characterized HEP-50768, a potent and selective small-molecule inverse agonist of hX4 through high-throughput screening and structure-activity optimization. Structural elucidation through cryo-electron microscopy of the hX4-inverse agonist complex structure revealed the unique binding mode and inhibitory mechanism of HEP-50768. In hX4-humanized rats, HEP-50768 robustly suppressed bile-acid-induced pruritic behaviors. Comprehensive preclinical absorption, distribution, metabolism, excretion and safety profiling was performed in both rats and monkeys, and these findings establish HEP-50768 as a promising therapeutic candidate for chronic itch, supporting its advancement to clinical evaluation. |
リンク | Nat Chem Biol / PubMed:41957282 |
| 手法 | EM (単粒子) |
| 解像度 | 2.56 - 2.63 Å |
| 構造データ | EMDB-64829, PDB-9v81: EMDB-64830, PDB-9v82: |
| 化合物 | ![]() PDB-1l9y: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / signal transduction / SIGNALING PROTEIN / G protein-coupled receptor |
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homo sapiens (ヒト)

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