PUBLICATION
Identification of the hypertension drug niflumic acid as a glycine receptor inhibitor
- Authors
- Ito, D., Kawazoe, Y., Sato, A., Uesugi, M., Hirata, H.
- ID
- ZDB-PUB-200822-2
- Date
- 2020
- Source
- Scientific Reports 10: 13999 (Journal)
- Registered Authors
- Hirata, Hiromi
- Keywords
- none
- MeSH Terms
-
- Animals
- Anti-Inflammatory Agents, Non-Steroidal/pharmacology
- Convulsants/pharmacology
- Embryo, Nonmammalian/cytology
- Embryo, Nonmammalian/drug effects
- Embryo, Nonmammalian/physiology
- Female
- Glycine/pharmacology
- Membrane Potentials/drug effects
- Nifedipine/pharmacology
- Niflumic Acid/pharmacology*
- Oocytes/drug effects
- Oocytes/metabolism
- Oocytes/physiology
- Picrotoxin/pharmacology
- Receptors, Glycine/agonists
- Receptors, Glycine/antagonists & inhibitors*
- Receptors, Glycine/metabolism
- Strychnine/pharmacology
- Synaptic Transmission/drug effects*
- Synaptic Transmission/physiology
- Vasodilator Agents/pharmacology
- Xenopus laevis
- Zebrafish/embryology
- Zebrafish/metabolism
- PubMed
- 32814817 Full text @ Sci. Rep.
Citation
Ito, D., Kawazoe, Y., Sato, A., Uesugi, M., Hirata, H. (2020) Identification of the hypertension drug niflumic acid as a glycine receptor inhibitor. Scientific Reports. 10:13999.
Abstract
Glycine is one of the major neurotransmitters in the brainstem and the spinal cord. Glycine binds to and activates glycine receptors (GlyRs), increasing Cl- conductance at postsynaptic sites. This glycinergic synaptic transmission contributes to the generation of respiratory rhythm and motor patterns. Strychnine inhibits GlyR by binding to glycine-binding site, while picrotoxin blocks GlyR by binding to the channel pore. We have previously reported that bath application of strychnine to zebrafish embryos causes bilateral muscle contractions in response to tactile stimulation. To explore the drug-mediated inhibition of GlyRs, we screened a chemical library of ~ 1,000 approved drugs and pharmacologically active molecules by observing touch-evoked response of zebrafish embryos in the presence of drugs. We found that exposure of zebrafish embryos to nifedipine (an inhibitor of voltage-gated calcium channel) or niflumic acid (an inhibitor of cyclooxygenase 2) caused bilateral muscle contractions just like strychnine-treated embryos showed. We then assayed strychnine, picrotoxin, nifedipine, and niflumic acid for concentration-dependent inhibition of glycine-mediated currents of GlyRs in oocytes and calculated IC50s. The results indicate that all of them concentration-dependently inhibit GlyR in the order of strychnine > picrotoxin > nifedipine > niflumic acid.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping