Genetic and pharmacological evidence for low-abundance TRPV3 expression in primary vagal afferent neurons

Shaw-Wen Wu; Jonathan E M Lindberg; James H Peters

doi:10.1152/ajpregu.00366.2015

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Genetic and pharmacological evidence for low-abundance TRPV3 expression in primary vagal afferent neurons

Journal article

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Genetic and pharmacological evidence for low-abundance TRPV3 expression in primary vagal afferent neurons

Shaw-Wen Wu, Jonathan E M Lindberg and James H Peters

American journal of physiology. Regulatory, integrative and comparative physiology, Vol.310(9), pp.R794-R805

05/01/2016

DOI: https://doi.org/10.1152/ajpregu.00366.2015

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https://hdl.handle.net/2376/109227

PMCID: PMC5000774

PMID: 26843581

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Abstract

Mice, Inbred C57BL

RNA, Messenger - genetics

Cells, Cultured

Gene Expression Regulation - physiology

Rats

Male

Nodose Ganglion - cytology

Nodose Ganglion - metabolism

RNA, Messenger - metabolism

Rats, Sprague-Dawley

Vagus Nerve - cytology

TRPV Cation Channels - genetics

Mice, Knockout

TRPV Cation Channels - metabolism

Animals

Mice

Neurons, Afferent - metabolism

Primary vagal afferent neurons express a multitude of thermosensitive ion channels. Within this family of ion channels, the heat-sensitive capsaicin receptor (TRPV1) greatly influences vagal afferent signaling by determining the threshold for action-potential initiation at the peripheral endings, while controlling temperature-sensitive forms of glutamate release at central vagal terminals. Genetic deletion of TRPV1 does not completely eliminate these temperature-dependent effects, suggesting involvement of additional thermosensitive ion channels. The warm-sensitive, calcium-permeable, ion channel TRPV3 is commonly expressed with TRPV1; however, the extent to which TRPV3 is found in vagal afferent neurons is unknown. Here, we begin to characterize the genetic and functional expression of TRPV3 in vagal afferent neurons using molecular biology (RT-PCR and RT-quantitative PCR) in whole nodose and isolated neurons and fluorescent calcium imaging on primary cultures of nodose ganglia neurons. We confirmed low-level TRPV3 expression in vagal afferent neurons and observed direct activation with putative TRPV3 agonists eugenol, ethyl vanillin (EVA), and farnesyl pyrophosphate (FPP). Agonist activation stimulated neurons also containing TRPV1 and was blocked by ruthenium red. FPP sensitivity overlapped with EVA and eugenol but represented the smallest percentage of vagal afferent neurons, and it was the only agonist that did not stimulate neurons from TRPV3(-/-1) mice, suggesting FPP has the highest selectivity. Further, FPP was predictive of enhanced responses to capsaicin, EVA, and eugenol in rats. From our results, we conclude TRPV3 is expressed in a discrete subpopulation of vagal afferent neurons and may contribute to vagal afferent signaling either directly or in combination with TRPV1.

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Title: Genetic and pharmacological evidence for low-abundance TRPV3 expression in primary vagal afferent neurons
Creators: Shaw-Wen Wu - Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington
Jonathan E M Lindberg - Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington
James H Peters - Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington jamespeters@vetmed.wsu.edu
Publication Details: American journal of physiology. Regulatory, integrative and comparative physiology, Vol.310(9), pp.R794-R805
Academic Unit: Integrative Physiology and Neuroscience, Department of
Publisher: United States
Grant note: R01 DK092651 / NIDDK NIH HHS
Identifiers: 99900547479801842
Language: English
Resource Type: Journal article