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Isolation of Cerebrospinal Fluid from Rodent Embryos for use with Dissected Cerebral Cortical Explants
Published on: March 11, 2013
Analysis of cerebro-spinal fluid protein composition in early developmental stages in chick embryos
1Instituto de Neurociencias de Castilla y León, Spain. gato@med.uva.es
Insights
Chick embryonic cerebrospinal fluid (CSF) protein levels increase during development, with 21 fractions identified. These findings offer insights into neuroepithelial stem cell development.
Area of Science:
- Developmental Biology
- Neuroscience
- Biochemistry
Background:
- Cerebrospinal fluid (CSF) protein concentration and composition in early development are largely unknown.
- Foetal CSF has higher protein concentrations than adult CSF, with typically five major fractions identified.
- Early developmental stages of CSF protein dynamics require further investigation.
Purpose of the Study:
- To investigate the protein concentration and composition of chick embryonic CSF during early developmental stages (18 to 30 H.H.).
- To identify and characterize the protein fractions present in embryonic CSF.
- To understand the developmental regulation of CSF proteins and their potential biological roles.
Main Methods:
- Electrophoretic separation of CSF proteins.
- High-sensitivity silver staining for protein detection.
- Analysis of protein concentration changes during chick embryonic development.
Main Results:
- CSF protein concentration progressively increases from early developmental stages (18 to 30 H.H.) to foetal levels.
- A total of 21 distinct protein fractions were identified in chick embryonic CSF.
- Proteins were classified into three groups based on concentration changes: high-concentration (A), stable low-concentration (B), and changing low-concentration (C).
- All identified CSF protein fractions were also found in embryonic serum, suggesting early evolution of transport mechanisms.
Conclusions:
- Chick embryonic CSF protein composition undergoes significant changes during early development.
- The identified protein fractions, particularly those with changing concentrations, may play crucial biological roles.
- The presence of CSF proteins in embryonic serum indicates that neuroepithelial transport mechanisms develop early.
- This study provides a foundational understanding of embryonic CSF proteome, aiding research on neuroepithelial stem cells and in vitro studies.
Abstract:
Foetal cerebro-spinal fluid (CSF) has a very high protein concentration when compared to adult CSF, and in many species five major protein fractions have been described. However, the protein concentration and composition in CSF during early developmental stages remains largely unknown. Our results show that in the earliest stages (18 to 30 H.H.) of chick development there is a progressive increase in CSF protein concentration until foetal values are attained. In addition, by performing electrophoretic separation and high-sensitivity silver staining, we were able to identify a total of 21 different protein fractions in the chick embryo CSF. In accordance with the developmental pattern of their concentration, these can be classified as follows: A: high-concentration fractions which corresponded with the ones described in foetal CSF by other authors; B: low-concentration fractions which remained stable throughout the period studied; C: low-concentration fractions which show changes during this period. The evolution and molecular weight of the latter group suggest the possibility of an important biological role. Our data demonstrate that all the CSF protein fractions are present in embryonic serum; this could mean that the specific transport mechanisms in neuroepithelial cells described in the foetal period evolve in very early stages of development. In conclusion, this paper offers an accurate study of the protein composition of chick embryonic CSF, which will help the understanding of the influences on neuroepithelial stem cells during development and, as a result, the appropriate conditions for the in vitro study of embryonic/foetal nervous tissue cells.
