Epigenetic regulation of Arc and c-Fos in the hippocampus after acute electroconvulsive stimulation in the rat.

TY - JOUR

T1 - Epigenetic regulation of Arc and c-Fos in the hippocampus after acute electroconvulsive stimulation in the rat.

AU - Dyrvig, Mads

AU - Hansen, Henrik H

AU - Christiansen, Søren Hofman Oliveira

AU - Woldbye, David Paul Drucker

AU - Mikkelsen, Jens D.

AU - Lichota, Jacek

PY - 2012/8/1

Y1 - 2012/8/1

N2 - Electroconvulsive stimulation (ECS) remains one of the most effective treatments of major depression. However, the underlying molecular changes still remain to be elucidated. Since ECS causes rapid and significant changes in gene expression we have looked at epigenetic regulation of two important immediate early genes that are both induced after ECS: c-Fos and Arc. We examined Arc and c. -Fos protein expression and found Arc present over 4. h, in contrast to c-Fos presence lasting only 1. h. Both genes had returned to baseline expression at 24. h post-ECS. Histone H4 acetylation (H4Ac) is one of the important epigenetic marks associated with gene activation. We show increased H4Ac at the c-Fos promoter at 1. h post-ECS. Surprisingly, we also observed a significant increase in DNA methylation of the Arc gene promoter at 24. h post-ECS. DNA methylation, which is responsible for gene silencing, is a rather stable covalent modification. This suggests that Arc expression has been repressed and may consequently remain inhibited for a prolonged period post-ECS. Arc plays a critical role in the maintenance phase of long-term potentiation (LTP) and consolidation of memory in the rat brain. Thus, this study is one of the first to demonstrate DNA methylation as a regulator of ECS-induced gene expression and it provides a molecular link to the memory deficits observed after ECS.

AB - Electroconvulsive stimulation (ECS) remains one of the most effective treatments of major depression. However, the underlying molecular changes still remain to be elucidated. Since ECS causes rapid and significant changes in gene expression we have looked at epigenetic regulation of two important immediate early genes that are both induced after ECS: c-Fos and Arc. We examined Arc and c. -Fos protein expression and found Arc present over 4. h, in contrast to c-Fos presence lasting only 1. h. Both genes had returned to baseline expression at 24. h post-ECS. Histone H4 acetylation (H4Ac) is one of the important epigenetic marks associated with gene activation. We show increased H4Ac at the c-Fos promoter at 1. h post-ECS. Surprisingly, we also observed a significant increase in DNA methylation of the Arc gene promoter at 24. h post-ECS. DNA methylation, which is responsible for gene silencing, is a rather stable covalent modification. This suggests that Arc expression has been repressed and may consequently remain inhibited for a prolonged period post-ECS. Arc plays a critical role in the maintenance phase of long-term potentiation (LTP) and consolidation of memory in the rat brain. Thus, this study is one of the first to demonstrate DNA methylation as a regulator of ECS-induced gene expression and it provides a molecular link to the memory deficits observed after ECS.

U2 - 10.1016/j.brainresbull.2012.05.004

DO - 10.1016/j.brainresbull.2012.05.004

M3 - Journal article

C2 - 22613772

SN - 0361-9230

VL - 88

SP - 507

EP - 513

JO - Brain Research Bulletin

JF - Brain Research Bulletin

ER -