TRPC4 ion channel protein is selectively expressed in a subpopulation of dopamine neurons in the ventral tegmental area

TL;DR

This study identifies TRPC4 ion channels in a specific subset of dopamine neurons in the VTA, suggesting a role in modulating social and emotional behaviors through dopamine regulation.

Contribution

It is the first to demonstrate TRPC4 expression in a subpopulation of VTA dopamine neurons and its potential impact on social and emotional regulation.

Findings

TRPC4 mRNA is present in the VTA and substantia nigra.

TRPC4 protein is localized on a subpopulation of dopamine neurons.

TRPC4 may influence dopamine release affecting social and emotional behaviors.

Abstract

The nonselective cation channel TRPC4 has been shown to be present in high abundance in the corticolimbic regions of the brain and play a pivotal role in modulating cellular excitability due to their involvement in intracellular Ca2+ regulation. Recently we reported their involvement in socialization and regulating anxiety-like behaviors in rats. Given the important role for dopamine in modulating emotions involved in social anxiety we investigated whether TRPC4 protein and mRNA was found on dopaminergic neurons of the ventral tegmental area (VTA). Using emulsion autoradiography we found that TRPC4 mRNA is indeed present in the VTA and the substantia nigra. Additionally, immunohistochemistry verified it's presence on a subpopulation of dopamine neurons in the VTA. We confirmed these findings by testing Trpc4 knock-out rats in addition to wild-type animals. This novel finding suggests that TRPC4 plays a pivotal role in regulating dopamine release in a sub-population of neurons that may modulate emotional and cognitive responses in social situations.