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Neonatal Maternal Separation Alters the Capacity of Adult Neural Precursor Cells to Differentiate into Neurons Via Methylation of Retinoic Acid Receptor Gene Promoter

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Title: Neonatal Maternal Separation Alters the Capacity of Adult Neural Precursor Cells to Differentiate into Neurons Via Methylation of Retinoic Acid Receptor Gene Promoter
Authors: Boku, Shuken Browse this author →KAKEN DB
Toda, Hiroyuki Browse this author
Nakagawa, Shin Browse this author →KAKEN DB
Kato, Akiko Browse this author
Inoue, Takeshi Browse this author →KAKEN DB
Koyama, Tsukasa Browse this author →KAKEN DB
Hiroi, Noboru Browse this author
Kusumi, Ichiro Browse this author →KAKEN DB
Keywords: Adult neurogenesis
Dentate gyrus
DNA methylation
DNA methyltransferase
Maternal separation
Retinoic acid receptor
Issue Date: 15-Feb-2015
Publisher: Elsevier
Journal Title: Biological psychiatry
Volume: 77
Issue: 4
Start Page: 335
End Page: 344
Publisher DOI: 10.1016/j.biopsych.2014.07.008
Abstract: BACKGROUND: Early life stress is thought to contribute to psychiatric disorders, but the precise mechanisms underlying this link are poorly understood. As neonatal stress decreases adult hippocampal neurogenesis, which, in turn, functionally contributes to many behavioral phenotypes relevant to psychiatric disorders, we examined how in vivo neonatal maternal separation (NMS) impacts the capacity of adult hippocampal neural precursor cells via epigenetic alterations in vitro. METHODS: Rat pups were separated from their dams for 3 hours daily from postnatal day (PND) 2 to PND 14 or were never separated from the dam (as control animals). We isolated adult neural precursor cells from the hippocampal dentate gyrus at PND 56 and assessed rates of proliferation, apoptosis, and differentiation in cell culture. We also evaluated the effect of DNA methylation at the retinoic acid receptor (RAR) promoter stemming from NMS on adult neural precursor cells. RESULTS: NMS attenuated neural differentiation of adult neural precursor cells but had no detectible effect on proliferation, apoptosis, or astroglial differentiation. The DNA methyltransferase (DNMT) inhibitor, 5-aza-dC, reversed a reduction by NMS of neural differentiation of adult neural precursor cells. NMS increased DNMT1 expression and decreased expression of RAR alpha. An RAR alpha agonist increased neural differentiation and an antagonist reduced retinoic acid-induced neural differentiation. NMS increased the methylated portion of RAR alpha promoter, and the DNMT inhibitor reversed a reduction by NMS of RAR alpha messenger RNA expression. CONCLUSIONS: NMS attenuates the capacity of adult hippocampal neural precursor cells to differentiate into neurons by decreasing expression of RAR alpha through DNMT1-mediated methylation of its promoter.
Type: article (author version)
URI: http://hdl.handle.net/2115/58027
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 久住 一郎

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