Blood-brain barrier protein phosphorylation and dephosphorylation.

Abstract:

:Capillaries in vertebrate brain have unique permeability properties that make up the blood-brain barrier (BBB). Although it is known that capillaries are innervated by nerve endings of intracerebral origin and that brain capillary function is likely acutely regulated by neuronal inputs, the possible mechanisms of neuronal regulation of capillary function are at present unknown. One possible mode of regulation is via the phosphorylation of brain capillary proteins. The present studies characterize, for the first time, the major phosphoproteins in the bovine brain capillary using both intact bovine brain capillaries and plasma membrane fractions from bovine brain capillaries. The patterns of endogenous phosphorylation of capillary proteins are compared to similar patterns obtained with synaptosomal (P2) fractions from bovine brain. The major findings of this study are: (a) The activity of protein phosphorylation in brain capillaries is localized almost exclusively to the capillary plasma membrane, and is nearly comparable to the activity of protein phosphorylation in synaptosomal membranes. (b) A major phosphoprotein doublet in the capillary fraction comigrates on a sodium dodecyl sulfate gel with a major phosphoprotein doublet of approximate molecular weight of 80K in the synaptosomal fraction, and the latter is presumed to be synapsin I; in dephosphorylation assays the synaptosomal 80K phosphoprotein doublet is not subject to measurable dephosphorylation, whereas the capillary 80K doublet is subject to rapid dephosphorylation, and is essentially completely dephosphorylated within 5 s at 0 degrees C. (c) A prominent triplet of phosphoproteins with molecular weight of 50-55K is present in the capillary fraction, and is not present in the synaptosomal fraction; thus, this 50-55K triplet of phosphoproteins appears specific for brain capillaries.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Neurochem

authors

Pardridge WM,Yang J,Eisenberg J

doi

10.1111/j.1471-4159.1985.tb05534.x

subject

Has Abstract

pub_date

1985-10-01 00:00:00

pages

1141-7

issue

4

eissn

0022-3042

issn

1471-4159

journal_volume

45

pub_type

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