Abstract
Trans-2-Pentenal (pentenal), an α,β-unsaturated aldehyde, induces increases in [Ca2+]i in cultured neonatal rat trigeminal ganglion (TG) neurons. Since all pentenal-sensitive neurons responded to a specific TRPA1 agonist, allyl isothiocyanate (AITC) and neurons from TRPA1 knockouts failed to respond to pentenal, TRPA1 appears to be sole initial transduction site for pentenal-evoked trigeminal response, as reported for the structurally related irritant, acrolein. Furthermore, because the neuronal sensitivity to pentenal is strictly dependent upon the presence of extracellular Na+/Ca2+, as we showed previously, we investigated which types of voltage-gated sodium/calcium channels (VGSCs/VGCCs) are involved in pentenal-induced [Ca2+]i increases as a downstream mechanisms. The application of tetrodotoxin (TTX) significantly suppressed the pentenal-induced increase in [Ca2+]i in a portion of TG neurons, suggesting that TTX-sensitive (TTXs) VGSCs contribute to the pentenal response in those neurons. Diltiazem and ω-agatoxin IVA, antagonists of L- and P/Q-type VGCCs, respectively, both caused significant reductions of the pentenal-induced responses. ω-Conotoxin GVIA, on the other hand, caused only a small decrease in the size of pentenal-induced [Ca2+]i rise. These indicate that both L- and P/Q-type VGCCs are involved in the increase in [Ca2+]i produced by pentenal, while N-type calcium channels play only a minor role. This study demonstrates that TTXs VGSCs, L- and P/Q-type VGCCs play a significant role in the pentenal-induced trigeminal neuronal responses as downstream mechanisms following TRPA1 activation.
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Abbreviations
- VOC:
-
Volatile organic compound
- TG:
-
Trigeminal ganglion
- AITC:
-
Allyl isothiocyanate
- VGSC:
-
Voltage-gated sodium channel
- VGCC:
-
Voltage-gated calcium channel
- TTX:
-
Tetrodotoxin
- TRP:
-
Transient receptor potential
- nAChR:
-
Nicotinic acetylcholine receptor
- CGRP:
-
Calcitonin gene-related peptide
- HBSS:
-
Hank’s balanced salt solution
- PS:
-
Penicillin–streptomycin
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Acknowledgments
Randy Peoples and Valerie Audige provided excellent cell culture support. This research was supported by funding from Japan Tobacco Inc.
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Inoue, T., Bryant, B.P. Multiple Cation Channels Mediate Increases in Intracellular Calcium Induced by the Volatile Irritant, Trans-2-Pentenal in Rat Trigeminal Neurons. Cell Mol Neurobiol 30, 35–41 (2010). https://doi.org/10.1007/s10571-009-9428-9
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DOI: https://doi.org/10.1007/s10571-009-9428-9