期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 278, 期 37, 页码 35079-35085出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M303098200
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资金
- NEI NIH HHS [EY13574] Funding Source: Medline
- NHLBI NIH HHS [HL59198, HL73856] Funding Source: Medline
- NIBIB NIH HHS [EB00415] Funding Source: Medline
- NIDDK NIH HHS [DK35124] Funding Source: Medline
- Telethon [GP0296Y01] Funding Source: Medline
Deletion of Phe-508 (DeltaF508) is the most common mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) causing cystic fibrosis. DeltaF508-CFTR has defects in both channel gating and endoplasmic reticulum-to-plasma membrane processing. We identified six novel classes of high affinity potentiators of defective DeltaF508-CFTR Cl- channel gating by screening 100,000 diverse small molecules. Compounds were added 15 min prior to assay of iodide uptake in epithelial cells co-expressing DeltaF508-CFTR and a high sensitivity halide indicator (YFP-H148Q/I152L) in which DeltaF508-CFTR was targeted to the plasma membrane by culture at 27 degreesC for 24 h. Thirty-two compounds with submicromolar activating potency were identified; most had tetrahydrobenzothiophene, benzofuran, pyramidinetrione, dihydropyridine, and anthraquinone core structures (360-480 daltons). Further screening of > 1000 structural analogs revealed tetrahydrobenzothiophenes that activated DeltaF508-CFTR Cl- conductance reversibly with K-d < 100 nM. Single-cell voltage clamp analysis showed characteristic CFTR currents after ΔF508-CFTR activation. Activation required low concentrations of a cAMP agonist, thus mimicking the normal physiological response. A Bayesian computational model was developed using tetrahydrobenzothiophene structure-activity data, yielding insight into the physical character and structural features of active and inactive potentiators and successfully predicting the activity of structural analogs. Efficient potentiation of defective ΔF508-CFTR gating was also demonstrated in human bronchial epithelial cells from a ΔF508 cystic fibrosis subject after 27 °C temperature rescue. In conjunction with correctors of defective ΔF508-CFTR processing, small molecule potentiators of defective ΔF508-CFTR gating may be useful for therapy of cystic fibrosis caused by the ΔF508 mutation.
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