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- W1988068469 abstract "The localization of four membrane-bound aminopeptidases—aminopeptidase A, aminopeptidase M, dipeptidylpeptidase IV, and γ-glutamyl transpeptidase—known as characteristic enzymes of the blood-brain barrier was studied in the microvasculature of some circumventricular organs of the mouse brain (subfornical organ, area postrema, choroid plexus, and neurohypophysis). Enzyme activities were demonstrated histochemically in chloroform-acetone-pretreated cryostat sections applying an azo-coupling method. Reactions were evaluated using light microscopy and end-point microdensitometry. The results revealed differences in microvascular enzyme pattern between circumventricular organs and regions having a blood-brain barrier. Moreover, the cytochemical picture of the circumventricular organs themselves was not uniform. Dipeptidylpeptidase IV reaction showed a strongly reduced activity in the microvessels of all studied circumventricular organs. On the other hand, aminopeptidase M seemed to be present in both the leaky and the tight capillaries. Only a low activity of aminopeptidase A was found in parts of the choroid endothelium and the subfornical organ microvasculature. γ-Glutamyl trans-peptidase could neither be detected in the capillary part of the choroid plexus nor in the neurohypophysis. We are led to conclude that at least dipeptidylpeptidase IV might be involved in special mechanisms of the blood-brain barrier." @default.
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- W1988068469 date "1992-03-01" @default.
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- W1988068469 title "Aminopeptidases in the circumventricular organs of the mouse brain: A histochemical study" @default.
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- W1988068469 doi "https://doi.org/10.1016/0306-4522(92)90257-3" @default.
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