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Neuronal development is promoted by weakened intrinsic antioxidant defences due to epigenetic repression of Nrf2.

Abstract：

:Forebrain neurons have weak intrinsic antioxidant defences compared with astrocytes, but the molecular basis and purpose of this is poorly understood. We show that early in mouse cortical neuronal development in vitro and in vivo, expression of the master-regulator of antioxidant genes, transcription factor NF-E2-related-factor-2 (Nrf2), is repressed by epigenetic inactivation of its promoter. Consequently, in contrast to astrocytes or young neurons, maturing neurons possess negligible Nrf2-dependent antioxidant defences, and exhibit no transcriptional responses to Nrf2 activators, or to ablation of Nrf2's inhibitor Keap1. Neuronal Nrf2 inactivation seems to be required for proper development: in maturing neurons, ectopic Nrf2 expression inhibits neurite outgrowth and aborization, and electrophysiological maturation, including synaptogenesis. These defects arise because Nrf2 activity buffers neuronal redox status, inhibiting maturation processes dependent on redox-sensitive JNK and Wnt pathways. Thus, developmental epigenetic Nrf2 repression weakens neuronal antioxidant defences but is necessary to create an environment that supports neuronal development.

journal_name

Nat Commun

journal_title

Nature communications

authors

Bell KF,Al-Mubarak B,Martel MA,McKay S,Wheelan N,Hasel P,Márkus NM,Baxter P,Deighton RF,Serio A,Bilican B,Chowdhry S,Meakin PJ,Ashford ML,Wyllie DJ,Scannevin RH,Chandran S,Hayes JD,Hardingham GE

doi

10.1038/ncomms8066

subject

Has Abstract

pub_date

2015-05-13 00:00:00

pages

7066

issn

2041-1723

pii

ncomms8066

journal_volume

6

pub_type

杂志文章

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