Expression of mutant huntingtin blocks exocytosis in PC12 cells by depletion of complexin II
Journal
Journal of Biological Chemistry
Journal Volume
278
Journal Issue
33
Pages
30849
Date Issued
2003-08-15
Author(s)
Edwardson, J. Michael
Gong, Belvin
Wyttenbach, Andreas
Bai, Jihong
Jackson, Meyer B.
Chapman, Edwin R.
Morton, A. Jennifer
Abstract
Huntington's disease (HD) is an autosomal dominant neurodegenerative disorder caused by an expanded CAG repeat in the HD gene. We reported recently that complexin II, a protein involved in neurotransmitter release, is depleted from both the brains of mice carrying the HD mutation and from the striatum of post mortem HD brains. Here we show that this loss of complexin II is recapitulated in PC12 cells expressing the HD mutation and is accompanied by a dramatic decline in Ca2+-triggered exocytosis of neurotransmitter. Overexpression of complexin II (but not complexin I) rescued exocytosis, demonstrating that the decline in neurotransmitter release is a direct consequence of complexin II depletion. Complexin II depletion in the brain may account for some of the abnormalities in neurotransmission associated with HD.
Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Type
journal article
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