A mercaptoacetamide-based Class II histone deacetylase inhibitor increases dendritic spine density via RasGRF1/ERK pathway

Jung Min Song, You Me Sung, Jin Han Nam, Hyejin Yoon, Andrew Chung, Emily Moffat, Mira Jung, Daniel T S Pak, Jungsu Kim, Hyang Sook Hoe

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Background: The accumulation of amyloid-β (Aβ) leads to the loss of dendritic spines and synapses, which is hypothesized to cause cognitive impairments in Alzheimer's disease (AD) patients. In our previous study, we demonstrated that a novel mercaptoacetamide-based class II histone deacetylase inhibitor (HDACI), known as W2, decreased Aβ levels and improved learning and memory in mice. However, the underlying mechanism of this effect is unknown. Objective: Because dendritic spine formation is associated with cognitive performance, here we investigated whether HDACI W2 regulates dendritic spine density and its molecular mechanism of action. Methods: To examine the effect of HDACI W2 on dendritic spine density, we conducted morphological analysis of dendritic spines using GFP transfection and Golgi staining. In addition, to determine the molecular mechanism of W2 effects on spines, we measured the levels of mRNAs and proteins involved in the Ras signaling pathway using quantitative real-time PCR, immunocytochemistry, and western analysis. Results: We found that HDACI W2 altered dendritic spine density and morphology in vitro and in vivo. Additionally, W2 increased the mRNA or protein levels of Ras GRF1 and phospho-ERK. Moreover, knockdown of RasGRF1 and inhibition of ERK activity prevented the W2-mediated spinogenesis in primary hippocampal neurons. Conclusion: Our Class II-selective HDACI W2 promotes the formation and growth of dendritic spines in a RasGRF1 and ERK dependent manner in primary hippocampal neurons.

Original languageEnglish (US)
Pages (from-to)591-604
Number of pages14
JournalJournal of Alzheimer's Disease
Volume51
Issue number2
DOIs
StatePublished - Mar 15 2016

Keywords

  • Alzheimer's disease
  • dendritic spine
  • HDAC inhibitor
  • ras signaling

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Geriatrics and Gerontology
  • Clinical Psychology

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    Song, J. M., Sung, Y. M., Nam, J. H., Yoon, H., Chung, A., Moffat, E., Jung, M., Pak, D. T. S., Kim, J., & Hoe, H. S. (2016). A mercaptoacetamide-based Class II histone deacetylase inhibitor increases dendritic spine density via RasGRF1/ERK pathway. Journal of Alzheimer's Disease, 51(2), 591-604. https://doi.org/10.3233/JAD-150717