Regulation of the voltage-gated Ca2+ channel CaVα2δ-1 subunit expression by the transcription factor Egr-1.

Abstract:

:It is well known that the CaVα2δ auxiliary subunit regulates the density of high voltage-activated Ca2+ channels in the plasma membrane and that alterations in their functional expression might have implications in the pathophysiology of diverse human diseases such as neuropathic pain. However, little is known concerning the transcriptional regulation of this protein. We previously characterized the promoter of CaVα2δ, and here we report its regulation by the transcription factor Egr-1. Using the neuroblastoma N1E-115 cells, we found that Egr-1 interacts specifically with its binding site in the promoter, affecting the transcriptional regulation of CaVα2δ. Overexpression and knockdown analysis of Egr-1 showed significant changes in the transcriptional activity of the CaVα2δ promoter. Egr-1 also regulated the expression of CaVα2δ at the level of protein. Also, functional studies showed that Egr-1 knockdown significantly decreases Ca2+ currents in dorsal root ganglion (DRG) neurons, while overexpression of the transcription factor increased Ca2+ currents in the F11 cell line, a hybrid of DRG and N18TG2 neuroblastoma cells. Studying the effects of Egr-1 on the transcriptional expression of CaVα2δ could help to understand the regulatory mechanisms of this protein in both health and disease.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

González-Ramírez R,Martínez-Hernández E,Sandoval A,Gómez-Mora K,Felix R

doi

10.1016/j.neulet.2018.03.005

subject

Has Abstract

pub_date

2018-04-23 00:00:00

pages

136-141

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(18)30174-5

journal_volume

673

pub_type

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