Activation of Drosophila melanogaster TRPA1 Isoforms by Citronellal and Menthol.
Int J Mol Sci
; 22(20)2021 Oct 12.
Article
in En
| MEDLINE
| ID: mdl-34681657
ABSTRACT
BACKGROUND:
The transient receptor potential ankyrin 1 (TRPA1) cation channels function as broadly-tuned sensors of noxious chemicals in many species. Recent studies identified four functional TRPA1 isoforms in Drosophila melanogaster (dTRPA1(A) to (D)), but their responses to non-electrophilic chemicals are yet to be fully characterized.METHODS:
We determined the behavioral responses of adult flies to the mammalian TRPA1 non-electrophilic activators citronellal and menthol, and characterized the effects of these compounds on all four dTRPA1 channel isoforms using intracellular Ca2+ imaging and whole-cell patch-clamp recordings.RESULTS:
Wild type flies avoided citronellal and menthol in an olfactory test and this behavior was reduced in dTrpA1 mutant flies. Both compounds activate all dTRPA1 isoforms in the heterologous expression system HEK293T, with the following sensitivity series dTRPA1(C) = dTRPA1(D) > dTRPA1(A) â« dTRPA1(B) for citronellal and dTRPA1(A) > dTRPA1(D) > dTRPA1(C) > dTRPA1(B) for menthol.CONCLUSIONS:
dTrpA1 was required for the normal avoidance of Drosophila melanogaster towards citronellal and menthol. All dTRPA1 isoforms are activated by both compounds, but the dTRPA1(B) is consistently the least sensitive. We discuss how these findings may guide further studies on the physiological roles and the structural bases of chemical sensitivity of TRPA1 channels.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Drosophila Proteins
/
Drosophila melanogaster
/
Aldehydes
/
TRPA1 Cation Channel
/
Acyclic Monoterpenes
/
Menthol
Type of study:
Prognostic_studies
Limits:
Animals
/
Female
/
Humans
/
Male
Language:
En
Journal:
Int J Mol Sci
Year:
2021
Type:
Article
Affiliation country:
Belgium