Quercetin inhibits acid-sensing ion channels through a putative binding site in the central vestibular region
| Autor: | Amal Kanti Bera, Anurag Singh, Mohona Mukhopadhyay, S. Sachchidanand |
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| Rok vydání: | 2017 |
| Předmět: |
Models
Molecular 0301 basic medicine CHO Cells Pharmacology Gene mutation 03 medical and health sciences chemistry.chemical_compound Cricetulus Animals Humans Homomeric heterocyclic compounds Receptor Acid-sensing ion channel Ion channel Neurons Binding Sites Cell Death GABAA receptor Chemistry General Neuroscience Acid Sensing Ion Channels HEK293 Cells 030104 developmental biology Acid Sensing Ion Channel Blockers NMDA receptor Calcium Quercetin |
| Zdroj: | Neuroscience. 348:264-272 |
| ISSN: | 0306-4522 |
| DOI: | 10.1016/j.neuroscience.2017.02.025 |
| Popis: | Acid-sensing ion channels (ASICs) are associated with many pathophysiological processes, such as neuronal death during ischemic stroke, epileptic seizure and nociception. However, there is a dearth of ASIC-specific therapeutic blockers. Here we report that quercetin, a plant flavonoid, which is known for its neuroprotective effect, reversibly inhibits homomeric rat ASIC1a, ASIC2a and ASIC3 with an IC50 of about 2µM. Also, quercetin prevents low pH-induced intracellular calcium rise and cell death in HEK-293 cells, which have endogenous expression of ASIC1a and 2a. The inhibitory effect of quercetin on ASICs is not due to membrane perturbation, as it did not have any effect on other channels, like NMDA receptor, GABAA receptor and P2X4 receptor. Unlike quercetin, another flavonoid resveratrol had no effect on ASIC1a. Computational analysis revealed that quercetin binds to the channel in a cavity at the central vestibule, lined by several charged residues like Q276, R369, E373 and E416 in ASIC1a. Mutation of Arg369 to Ala or Glu416 to Gln abolished the inhibitory effect of quercetin on rat ASIC1a completely, while Glu373 to Gln showed reduced sensitivity. Our results raise the possibility of using quercetin for targeting ASICs in vivo. |
| Databáze: | OpenAIRE |
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