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. 1994 Jan 18;91(2):499–503. doi: 10.1073/pnas.91.2.499

Cloning and in situ localization of a brain-derived porin that constitutes a large-conductance anion channel in astrocytic plasma membranes.

R Dermietzel 1, T K Hwang 1, R Buettner 1, A Hofer 1, E Dotzler 1, M Kremer 1, R Deutzmann 1, F P Thinnes 1, G I Fishman 1, D C Spray 1, et al.
PMCID: PMC42976  PMID: 7507248

Abstract

We have cloned a protein from bovine brain, brain-derived voltage-dependent anion channel 1 (BR1-VDAC), that is identical to a recently sequenced plasmalemmal-bound porin from human lymphocytes. mRNA hybridization indicates that BR1-VDAC is widely distributed throughout nervous and nonnervous tissues. In situ localization substantiated that the BR1-VDAC is associated with the plasmalemma of astrocytes. A monoclonal antibody that recognizes the N terminus of the BR1-VDAC protein completely blocks an astrocytic high-conductance anion channel that has electrophysiological similarities with the mitochondrial VDAC. Since the high-conductance anion channel in astrocytes has been shown to respond to hypoosmotic solutions, its molecular identification provides the basis for a better understanding of volume regulation in brain tissue.

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Selected References

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