Abstract：
:Current medications inadequately treat the symptoms of chronic pain experienced by over 50 million people in the United States, and may come with substantial adverse effects signifying the need to find novel treatments. One novel therapeutic target is the Transient Receptor Potential A1 channel (TRPA1), an ion channel that mediates nociception through calcium influx of sensory neurons. Drug discovery still relies heavily on animal models, including zebrafish, a species in which TRPA1 activation produces hyperlocomotion. Here, we investigated if this hyperlocomotion follows zebrafish TRPA1 pharmacology and evaluated the strengths and limitations of using TRPA1-mediated hyperlocomotion as potential preclinical screening tool for drug discovery. To support face validity of the model, we pharmacologically characterized mouse and zebrafish TRPA1 in transfected HEK293 cells using calcium assays as well as in vivo. TRPA1 agonists and antagonists respectively activated or blocked TRPA1 activity in HEK293 cells, mice, and zebrafish in a dose-dependent manner. However, our results revealed complexities including partial agonist activity of TRPA1 antagonists, bidirectional locomotor activity, receptor desensitization, and off-target effects. We propose that TRPA1-mediated hyperlocomotion in zebrafish larvae has the potential to be used as in vivo screening tool for novel anti-nociceptive drugs but requires careful evaluation of the TRPA1 pharmacology.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Ko MJ,Ganzen LC,Coskun E,Mukadam AA,Leung YF,van Rijn RMdoi
10.1038/s41598-019-38852-9subject
Has Abstractpub_date
2019-02-20 00:00:00pages
2430issue
1issn
2045-2322pii
10.1038/s41598-019-38852-9journal_volume
9pub_type
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