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Neurospheres from neural stem/neural progenitor cells (NSPCs) of non-hydrocephalic HTx rats produce neurons, astrocytes and multiciliated ependyma: the cerebrospinal fluid of normal and hydrocephalic rats supports such a differentiation

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Abstract

Fetal onset hydrocephalus and abnormal neurogenesis are two inseparable phenomena turned on by a cell junction pathology first affecting neural stem/progenitor cells (NSPCs) and later the multiciliated ependyma. The neurological impairment of children born with hydrocephalus is not reverted by derivative surgery. NSPCs and neurosphere (NE) grafting into the cerebrospinal fluid (CSF) of hydrocephalic fetuses thus appears as a promising therapeutic procedure. There is little information about the cell lineages actually forming the NE as they grow throughout their days in vitro (DIV). Furthermore, there is no information on how good a host the CSF is for grafted NE. Here, we use the HTx rat, a model with hereditary hydrocephalus, with the mutation expressed in about 30% of the litter (hyHTx), while the littermates develop normally (nHTx). The investigation was designed (i) to establish the nature of the cells forming 4 and 6-DIV NE grown from NSPCs collected from PN1/nHTx rats and (ii) to study the effects on these NEs of CSF collected from nHTx and hyHTx. Immunofluorescence analyses showed that 90% of cells forming 4-DIV NEs were non-committed multipotential NSPCs, while in 6-DIV NE, 40% of the NSPCs were already committed into neuronal, glial and ependymal lineages. Six-DIV NE further cultured for 3 weeks in the presence of fetal bovine serum, CSF from nHTx or CSF from hyHTx, differentiated into neurons, astrocytes and βIV-tubulin+ multiciliated ependymal cells that were joined together by adherent junctions and displayed synchronized cilia beating. This supports the possibility that ependymal cells are born from subpopulations of NSC with their own time table of differentiation. As a whole, the findings indicate that the CSF is a supportive medium to host NE and that NE grafted into the CSF have the potential to produce neurons, glia and ependyma.

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Abbreviations

AJ:

adherent junctions

AQP4:

aquaporin 4

BrdU:

bromodeoxyuridine

CSF:

cerebrospinal fluid

DIV:

days in vitro

EGF:

epidermal growth factor

FBS:

fetal bovine serum

FGF:

fibroblast growth factor

GFAP:

glial fibrillary acidic protein

GJ:

gap junctions

hyHTx:

hydrocephalic Texas rat

NSPCs:

neural stem and progenitor cells

NE:

neurospheres

nHTX:

non-hydrocephalic Texas rat

PN:

postnatal

SVZ:

subventricular zone

VZ:

ventricular zone

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Acknowledgements

The authors wish to acknowledge the valuable technical support of Mrs Clara Jara, and Confocal and Electron Microscopy Core Facilities of Universidad Austral de Chile. Monoclonal antibodies against nestin and BrdU were obtained from the Developmental Studies Hybridoma Bank developed under the auspices of the NICHD and maintained by The University of Iowa, Department of Biological Sciences, Iowa City, Iowa.

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Correspondence to Montserrat Guerra.

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Supported by Fondecyt 1111018 to EMR; Hydrocephalus Association Established Investigator Award No. 51002705 to PM, EMR, CJ; Doctoral CONICYT Fellowship (Chile) to RH.

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ESM 1

6DIV neurospheres cultured in the presence of FGF and then further cultured for 21 d in the presence of 5% FBS but no FGF. Phase contrast microscopy of an area similar to that shown in Fig. 6(d). The arrows point to cilia beating of ependymal cells generated in vitro. (PPTX 52118 kb)

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Henzi, R., Guerra, M., Vío, K. et al. Neurospheres from neural stem/neural progenitor cells (NSPCs) of non-hydrocephalic HTx rats produce neurons, astrocytes and multiciliated ependyma: the cerebrospinal fluid of normal and hydrocephalic rats supports such a differentiation. Cell Tissue Res 373, 421–438 (2018). https://doi.org/10.1007/s00441-018-2828-8

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  • DOI: https://doi.org/10.1007/s00441-018-2828-8

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