Abstract:
:TRPA1 of insects and several tetrapod vertebrates except for those of rodents have been reported to be activated by noxious chemicals and also by high temperature with a relatively clear threshold. We previously analyzed the characteristics of two TRPA1 paralogs of zebrafish (zTRPA1a, b) and demonstrated that zTRPA1a is specialized for chemical sensing while zTRPA1b responds to thermal stimulations, that zTRPA1b responds to both cold and heat stimuli, and that heat stimulation gradually activates zTRPA1b without a clear threshold. In the medaka genome, a single TRPA1 (olTRPA1) gene is present. To examine if functional properties of olTRPA1 are similar to TRPA1 of land animals or either of zTRPA1a or zTRPA1b, we isolated a TRPA1 cDNA from medaka and performed functional analyses. OlTRPA1 showed a sensitivity to four noxious chemicals (allyl isothiocyanate, caffeine, carvacrol, methyl anthranilate). We observed that cold stimulation does not activate olTRPA1, but heat stimulation gradually activates olTRPA1 with an unclear threshold. Results suggested that a single TRPA1 functions as a chemical and thermal sensor in medaka, and that a gradual heat-activation without clear threshold might be a common feature for TRPA1 of fish living in water.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Oda M,Saito K,Hatta S,Kubo Y,Saitoh Odoi
10.1016/j.bbrc.2017.10.057subject
Has Abstractpub_date
2017-12-09 00:00:00pages
194-201issue
1-2eissn
0006-291Xissn
1090-2104pii
S0006-291X(17)32035-1journal_volume
494pub_type
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