N-cinnamoylanthranilates as human TRPA1 modulators: Structure-activity relationships and channel binding sites
Chandrabalan, Arundhasa; McPhillie, Martin J.; Morice, Alyn H.; Boa, Andrew N.; Sadofsky, Laura R.
Martin J. McPhillie
Alyn H. Morice
Dr Andrew Boa A.N.Boa@hull.ac.uk
Dr Laura Sadofsky L.R.Sadofsky@hull.ac.uk
Lecturer in Respiratory Medicine/ Academic lead for postgraduate training in HYMS
The transient receptor potential ankyrin 1 (TRPA1) channel is a non-selective cation channel, which detects noxious stimuli leading to pain, itch and cough. However, the mechanism(s) of channel modulation by many of the known, non-reactive modulators has not been fully elucidated. N-cinnamoylanthranilic acid derivatives (CADs) contain structural elements from the TRPA1 modulators cinnamaldehyde and flufenamic acid, so it was hypothesized that specific modulators could be found amongst them and more could be learnt about modulation of TRPA1 with these compounds. A series of CADs was therefore screened for agonism and antagonism in HEK293 cells stably transfected with WT-human (h)TRPA1, or C621A, F909A or F944A mutant hTRPA1. Derivatives with electron-withdrawing and/or electron-donating substituents were found to possess different activities. CADs with inductive electron-withdrawing groups were agonists with desensitizing effects, and CADs with electron-donating groups were either partial agonists or antagonists. Site-directed mutagenesis revealed the CADs do not undergo conjugate addition reaction with TRPA1 and reveal that F944 is a key residue involved in the non-covalent modulation of TRPA1 by CADs, as well as many other structurally distinct non-reactive TRPA1 ligands already reported.
|Journal Article Type||Article|
|Publication Date||May 15, 2019|
|Journal||European Journal of Medicinal Chemistry|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Chandrabalan, A., McPhillie, M. J., Morice, A. H., Boa, A. N., & Sadofsky, L. R. (2019). N-cinnamoylanthranilates as human TRPA1 modulators: Structure-activity relationships and channel binding sites. European Journal of Medicinal Chemistry, 170, 141-156. https://doi.org/10.1016/j.ejmech.2019.02.074|
|Keywords||Organic Chemistry; Pharmacology; Drug Discovery; General Medicine|
© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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