Ciliogenesis and cerebrospinal fluid flow in the developing Xenopus brain are regulated by foxj1

Cilia

Kerstin Feistel³  Thomas Thumberger²  Christina Müller³  Peter Walentek¹  Cathrin Hagenlocher³ 

[1] Present address: Department of Molecular and Cell Biology, Center for Integrative Genomics, University of California at Berkeley, Berkeley, California 94720, USA;Centre for Organismal Studies, Im Neuenheimer Feld 230, University of Heidelberg, 69120 Heidelberg, Germany;Institute of Zoology, University of Hohenheim, Garbenstr. 30, Stuttgart 70593, Germany

关键词: Zona limitans intrathalamica;    Xenopus;    Subcommissural organ;    Reissner’s fiber;    Hydrocephalus;    Foxj1;    Choroid plexus;    Cerebrospinal fluid flow;    Brain;    Cilia;   

Others  :  795331
DOI  :  10.1186/2046-2530-2-12

 received in 2013-05-06, accepted in 2013-09-03,  发布年份 2013

【 摘 要 】

Background

Circulation of cerebrospinal fluid (CSF) through the ventricular system is driven by motile cilia on ependymal cells of the brain. Disturbed ciliary motility induces the formation of hydrocephalus, a pathological accumulation of CSF resulting in ventricle dilatation and increased intracranial pressure. The mechanism by which loss of motile cilia causes hydrocephalus has not been elucidated. The aim of this study was: (1) to provide a detailed account of the development of ciliation in the brain of the African clawed frog Xenopus laevis; and (2) to analyze the relevance of ependymal cilia motility for CSF circulation and brain ventricle morphogenesis in Xenopus.

Methods

Gene expression analysis of foxj1, the bona fide marker for motile cilia, was used to identify potentially ciliated regions in the developing central nervous system (CNS) of the tadpole. Scanning electron microscopy (SEM) was used to reveal the distribution of mono- and multiciliated cells during successive stages of brain morphogenesis, which was functionally assessed by bead injection and video microscopy of ventricular CSF flow. An antisense morpholino oligonucleotide (MO)-mediated gene knock-down that targeted foxj1 in the CNS was applied to assess the role of motile cilia in the ventricles.

Results

RNA transcripts of foxj1 in the CNS were found from neurula stages onwards. Following neural tube closure, foxj1 expression was seen in distinct ventricular regions such as the zona limitans intrathalamica (ZLI), subcommissural organ (SCO), floor plate, choroid plexus (CP), and rhombomere boundaries. In all areas, expression of foxj1 preceded the outgrowth of monocilia and the subsequent switch to multiciliated ependymal cells. Cilia were absent in foxj1 morphants, causing impaired CSF flow and fourth ventricle hydrocephalus in tadpole-stage embryos.

Conclusions

Motile ependymal cilia are important organelles in the Xenopus CNS, as they are essential for the circulation of CSF and maintenance of homeostatic fluid pressure. The Xenopus CNS ventricles might serve as a novel model system for the analysis of human ciliary genes whose deficiency cause hydrocephalus.

【 授权许可】

   
2013 Hagenlocher et al.; licensee BioMed Central Ltd.

【 图 表 】

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