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Abstract. Here we hypothesized that the water-soluble lysosomal enzymes may cross the bloodâbrain-barrier and reach the brain using the mechanism of unspecific fluid-phase endocytosis.n fact, there has been increasing evidence that when high serum levels of lysosomal enzymes are achieved, either by GT or ERT, a small fraction of the enzyme is able to cross the BBB by mechanisms not clearly understood [6] , [7] and [8] . Table 1.
The blood-brain barrier (BBB) is a diffusion barrier, which impedes influx of most compounds from blood to brain. Three cellular elements of the brain microvasculature compose the BBB-endothelial cells, astrocyte end-feet, and pericytes (PCs).Tight junctions (TJs), present between the cerebral endothelial cells, form a diffusion barrier, which selectively excludes most blood-borne substances from entering the brain.hree cellular elements of the brain microvasculature compose the BBB-endothelial cells, astrocyte end-feet, and pericytes (PCs). Tight junctions (TJs), present between the cerebral endothelial cells, form a diffusion barrier, which selectively excludes most blood-borne substances from entering the brain.