Journal
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE
Volume 1832, Issue 6, Pages 742-753Publisher
ELSEVIER
DOI: 10.1016/j.bbadis.2013.02.006
Keywords
Huntington's disease; Brain-type creatine kinase; Neuritogenesis; Protein aggregate; Proteasome
Funding
- Academia Sinica [AS-94-TP-B17, AS-97-TP-B02, AS-100-TP2-B02]
- National Science Council, Taiwan [NSC97-2321-B-001-030, NSC98-2321-B-001-017, NSC99-2321-B-001-012, NSC100-2321-B-001-009]
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Huntington's disease (HD) is a hereditary neurodegenerative disorder caused by a CAG repeat expansion in the huntingtin (HTT) gene. Brain-type creatine kinase (CKB) is an enzyme involved in energy homeostasis via the phosphocreatine-creatine kinase system. Although downregulation of CKB was previously reported in brains of HD mouse models and patients, such regulation and its functional consequence in HD are not fully understood. In the present study, we demonstrated that levels of CKB found in both the soma and processes were markedly reduced in primary neurons and brains of HD mice. We show for the first time that mutant HTT (mHTT) suppressed the activity of the promoter of the C.KB gene, which contributes to the lowered CKB expression in HD. Exogenous expression of wild-type CKB, but not a dominant negative CKB mutant, rescued the ATP depletion, aggregate formation, impaired proteasome activity, and shortened neurites induced by mHTT. These findings suggest that negative regulation of CKB by mHTT is a key event in the pathogenesis of HD and contributes to the neuronal dysfunction associated with HD. In addition, besides dietary supplementation with the CKB substrate, strategies aimed at increasing CKB expression might lead to the development of therapeutic treatments for HD. (C) 2013 Elsevier B.V. All rights reserved.
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