Early methyl donor deficiency may induce persistent brain defects by reducing Stat3 signaling targeted by miR-124

被引：51

作者：

Kerek, R. ^{[1
,2
]}

Geoffroy, A. ^{[1
,2
]}

Bison, A. ^{[1
,2
]}

Martin, N. ^{[1
,2
]}

Akchiche, N. ^{[1
,2
]}

Pourie, G. ^{[1
,2
]}

Helle, D. ^{[1
,2
]}

Gueant, J-L ^{[1
,2
,3
]}

Bossenmeyer-Pourie, C. ^{[1
,2
]}

Daval, J-L ^{[1
,2
]}

机构：

[1] Fac Med, INSERM, U954, F-54500 Vandoeuvre Les Nancy, France

[2] Univ Lorraine, Fac Med Nancy, Vandoeuvre Les Nancy, France

[3] Inst Res Mental Retardat & Brain Aging, IRCCS, Oasi Maria SS, Troina, Italy

来源：

CELL DEATH & DISEASE | 2013年 / 4卷

关键词：

folate; vitamin B12; Stat3; miR-124; epigenetics; brain development; NEURAL-TUBE DEFECTS; FOLATE-DEFICIENCY; VITAMIN-B-12; DEFICIENCIES; SERINE PHOSPHORYLATION; COGNITIVE IMPAIRMENT; CELL PROLIFERATION; TRANSCRIPTION; DIFFERENTIATION; FETAL; HYPERHOMOCYSTEINEMIA;

D O I：

10.1038/cddis.2013.278

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

The methyl donors folate (vitamin B9) and vitamin B12 are centrepieces of the one-carbon metabolism that has a key role in transmethylation reactions, and thus in epigenetic and epigenomic regulations. Low dietary intakes of folate and vitamin B12 are frequent, especially in pregnant women and in the elderly, and deficiency constitutes a risk factor for various diseases, including neurological and developmental disorders. In this respect, both vitamins are essential for normal brain development, and have a role in neuroplasticity and in the maintenance of neuronal integrity. The consequences of a methyl donor deficiency (MDD) were studied both in vivo in rats exposed in utero, and in vitro in hippocampal progenitors (H19-7 cell line). Deficiency was associated with growth retardation at embryonic day 20 (E20) and postnatally with long-term brain defects in selective areas. mRNA and protein levels of the transcription factor Stat3 were found to be decreased in the brains of deprived fetuses and in differentiating progenitors (62 and 48% for total Stat3 protein, respectively), along with a strong reduction in its phosphorylation at both Tyr(705) and Ser(727) residues. Vitamin shortage also affected upstream kinases of Stat3 signaling pathway (phospho-Erk1/2, phospho-Src, phospho-JNK, and phospho-p38) as well as downstream target gene products (Bcl-2 and Bcl-xL), thus promoting apoptosis. Conversely, the expression of the Stat3 regulator miR-124 was upregulated in deficiency conditions (>= 65%), and its silencing by using siRNA partly restored Stat3 signaling in hippocampal neurons by increasing specifically the phosphorylation of Erk1/2 and Src kinases. Furthermore, miR-124 siRNA improved the phenotype of deprived cells, with enhanced neurite outgrowth. Taken together, our data suggest that downregulation of Stat3 signaling by miR-124 would be a key factor in the deleterious effects of MDD on brain development.

引用

页码：e755 / e755

页数：11

共 53 条

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