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  • Title: The nature of the decrease in blood-cerebrospinal fluid barrier exchange during postnatal brain development in the rat.
    Author: Habgood MD, Knott GW, Dziegielewska KM, Saunders NR.
    Journal: J Physiol; 1993 Aug; 468():73-83. PubMed ID: 8254533.
    Abstract:
    1. The blood-cerebrospinal fluid (CSF) exchange of a wide range of passively transported lipid insoluble compounds (0.43-5.4 nm molecular radius) has been investigated in rats at different stages of postnatal development (2 days old to adult). A novel 'litter-based' model for investigating blood-CSF barrier exchange in immature animals is described. 2. At each age investigated there was a clear inverse correlation between molecular radius and blood-CSF barrier exchange, in addition to an overall decrease in blood-CSF barrier exchange with increasing age. 3. The decrease in blood-CSF barrier exchange with age was not consistent with a reduction in pore diameters, nor does it appear to be due to an increase in the CSF sink effect with age. It seems likely to be due to a relative decrease in the number of a population of large diameter pores.
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