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Development of the blood-CSF barrier
Insights
The blood-cerebrospinal fluid (CSF) barrier matures rapidly in infants, with protein levels decreasing significantly in the first year. Barrier function is linked to conceptional age in preterm infants.
Area of Science:
- Neuroscience
- Developmental Biology
- Pediatrics
Background:
- The blood-cerebrospinal fluid (CSF) barrier is crucial for maintaining central nervous system homeostasis.
- Understanding its developmental trajectory is essential for diagnosing and managing neurological conditions in children.
Purpose of the Study:
- To investigate the developmental timeline of the blood-CSF barrier in healthy children from fetal stage to adolescence.
- To analyze protein and cell count changes in CSF and serum to assess barrier maturation and selectivity.
Main Methods:
- Collected CSF and serum samples from 185 healthy children (27 fetal weeks to 16 years).
- Measured total protein, individual protein concentrations (albumin, alpha 2-macroglobulin, IgG, IgM, IgA), and cell counts.
- Calculated serum:CSF ratios to evaluate barrier selectivity.
Main Results:
- Albumin, alpha 2-macroglobulin, and IgG were present in all CSF samples, with concentrations decreasing post-birth until age one.
- IgM was absent in CSF; IgA was found infrequently.
- Serum:CSF protein ratios increased, indicating reduced barrier selectivity during the first year.
- Maximal barrier maturation occurred around the third month of life, followed by a decline.
- Preterm infants' barrier status correlated with conceptional age, not birth timing.
Conclusions:
- The blood-CSF barrier undergoes significant development and maturation during early infancy.
- Barrier function shows dynamic changes in the first year, with reduced selectivity after initial maturation.
- Conceptional age is a key factor in blood-CSF barrier development for preterm infants.
Abstract:
The development of the blood-CSF barrier was investigated by establishing total protein, individual protein levels and cell-counts in the CSF and serum of 185 healthy children, with an age range from 27 fetal weeks to 16 years. Albumin, alpha 2-macroglobulin and immunoglobulin G were found in all CSF specimens. With the exception of IgG, their concentrations decreased continuously until the end of the first year of life. IgM was not present in the CSF and IgA was found in only a few cases. Serum:CSF ratios of individual proteins increased continuously from the fetal period to the first year and there was a decline in barrier selectivity during the same period. Maturation of the barrier was maximal during the third month of life, decreasing quickly thereafter. The barrier condition of preterm infants was closely related to conceptional age, but not to the time of birth.