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Published on: January 29, 2015
Dystrophin-associated protein scaffolding in brain requires alpha-dystrobrevin
April D Bragg1, Sonal S Das, Stanley C Froehner
1Department of Physiology and Biophysics, University of Washington, Seattle, Washington 98195, USA.
Abstract:
Dystrophin and the alpha-dystrobrevins bind directly to the adapter protein syntrophin to form membrane-associated scaffolds. At the blood-brain barrier, alpha-syntrophin colocalizes with dystrophin and the alpha-dystrobrevins in perivascular glial endfeet and is required for localization of the water channel aquaporin-4. Earlier we have shown that localization of the scaffolding proteins gamma2-syntrophin, alpha-dystrobrevin-2, and dystrophin to glial endfeet is also dependent on the presence of alpha-syntrophin. In this study, we show that the expression levels of alpha-syntrophin, gamma2-syntrophin, and dystrophin at the blood-brain barrier are reduced in alpha-dystrobrevin-null mice. This is the first demonstration in which assembly of an astroglial protein scaffold containing syntrophin and dystrophin in perivascular astrocytes is dependent on the presence of alpha-dystrobrevin.
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