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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 barrier function of the bloodâbrain barrier is due to: (1) tight junctions that restrict movement of substances between the endothelial cells, (2) specific transport proteins that determine which substances can cross the barrier transcellularly and (3) enzymes that may degrade or alter substances prior to passage.rain capillaries form a tight barrier except in specialised areas. Tight junctions restrict paracellular movement of substances across the bloodâbrain barrier. Astrocytes contribute to differentiation of the bloodâbrain barrier. Transport across the bloodâbrain barrier may be passive or active.