Abstract
Background
Congenital hydrocephalus (HCP) is a developmental brain disorder characterized by the abnormal accumulation of cerebrospinal fluid within the ventricles. It is caused by genetic and acquired factors that start during early embryogenesis with disruption of the neurogerminal areas. As might be expected, early-onset hydrocephalus alters the process of brain development leading to irreparable neurological deficit. A primary alteration of the ependyma/neural stem cells (affecting vesicle trafficking and abnormal cell junctions) leads to its loss or denudation and translocation of neural progenitor cells (NPCs) and neural stem cells (NSCs) into the cerebrospinal fluid (CSF). Under these abnormal conditions, morphological and functional processes, underlying the concept of astroglial reaction, are initiated in an attempt to recover homeostasis in the periventricular zone. This astroglial reaction includes astrocyte hypertrophy, hyperplasia, and development of a new layer with reorganized functional features that resemble the ependyma. Despite decades of research, there is a lack of information concerning the biological basis of the brain abnormalities that are associated with HCP.
Discussion
The present review of current literature discusses the neuropathological changes during gestation following the onset of congenital hydrocephalus and the unanswered questions into the pathophysiology of the disease. A better understanding of those missing points might help create novel therapeutic strategies that can reverse or even prevent the ultimate neurological impairment that affects this population and improve long-term clinical outcome.
Data availability
Data supporting the findings of this study are available within the article and its supplementary information.
Abbreviations
- CNS:
-
Central nervous system
- CSF:
-
Cerebrospinal fluid
- EEA1:
-
Early endosomal antigen 1
- ETV:
-
Endoscopic third ventriculostomy
- GFAP:
-
Glial fibrillary acidic protein
- HCP:
-
Hydrocephalus
- HTx:
-
Hydrocephalus Texas
- L1CAM:
-
L1 cell adhesion molecule
- NSC:
-
Neural stem cells
- NPC:
-
Neural progenitor cells
- PCCH:
-
Perspective Classification of Congenital Hydrocephalus
- RGM:
-
Repulsive guidance molecule
- SVZ:
-
Subventricular zone
- TNFα:
-
Tumor necrosis factor alpha
- TNFαR1:
-
Tumor necrosis factor alpha receptor 1
- VEGF:
-
Vascular endothelial growth factor
- VZ:
-
Ventricular zone
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We greatly appreciate Prof. Helen Jones for the invaluable help and advice during manuscript editing.
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Study concept and design: M.O.
Acquisition of data: MF.V., M. M, M.O
Analysis and interpretation of data: MF.V., M. M, M.O.
First draft of the manuscript: MF.V.
Drafting of the manuscript: MF.V., M. M, M.O.
Critical revision of the manuscript for important intellectual content: MF.V., M. M, M.O.
Study supervision: M.O.
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Varela, M.F., Miyabe, M.M. & Oria, M. Fetal brain damage in congenital hydrocephalus. Childs Nerv Syst 36, 1661–1668 (2020). https://doi.org/10.1007/s00381-020-04657-9
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DOI: https://doi.org/10.1007/s00381-020-04657-9