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Childs Nerv Syst. 2014 Aug;30(8):1343-53. doi: 10.1007/s00381-014-2428-1. Epub 2014 May 10.

A critical role of noggin in developing folate-nonresponsive NTD in Fkbp8 -/- embryos.

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  • 1Developmental Neurobiology Laboratory, Department of Pediatric Neurosurgery, Developmental Biology Program, Lurie Children's Research Center, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, IL, 60614, USA.

Abstract

PURPOSE:

Maternal folate intake has reduced the incidence of human neural tube defects by 60-70 %. However, 30-40 % of cases remain nonresponsive to folate intake. The main purpose of this study was to understand the molecular mechanism of folate nonresponsiveness in a mouse model of neural tube defect.

METHODS:

We used a folate-nonresponsive Fkbp8 knockout mouse model to elucidate the molecular mechanism(s) of folate nonresponsiveness. Neurospheres were grown from neural stem cells isolated from the lumbar neural tube of E9.5 Fkbp8 (-/-) and wild-type embryos. Immunostaining was used to determine the protein levels of oligodendrocyte transcription factor 2 (Olig2), Nkx6.1, class III beta-tubulin (TuJ1), O4, glial fibrillary acidic protein (GFAP), histone H3 Lys27 trimethylation (H3K27me3), ubiquitously transcribed tetratricopeptide repeat (UTX), and Msx2, and quantitative real-time (RT)-PCR was used to determine the message levels of Olig2, Nkx6.1, Msx2, and noggin in neural stem cells differentiated in the presence and absence of folic acid.

RESULTS:

Fkbp8 (-/-)-derived neural stem cells showed (i) increased noggin expression; (ii) decreased Msx2 expression; (iii) premature differentiation--neurogenesis, oligodendrogenesis (Olig2 expression), and gliogenesis (GFAP expression); and (iv) increased UTX expression and decreased H3K27me3 polycomb modification. Exogenous folic acid did not reverse these markers.

CONCLUSIONS:

Folate nonresponsiveness could be attributed in part to increased noggin expression in Fkbp8 (-/-) embryos, resulting in decreased Msx2 expression. Folate treatment further increases Olig2 and noggin expression, thereby exacerbating ventralization.

PMID:
24817375
DOI:
10.1007/s00381-014-2428-1
[PubMed - indexed for MEDLINE]
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