Human Molecular Genetics, 2001, Vol. 10, No. 17 1829-1845
© 2001 Oxford University Press
Polyglutamine expansions cause decreased CRE-mediated transcription and early gene expression changes prior to cell death in an inducible cell model of Huntingtons disease
Wellcome Trust Centre for Molecular Mechanisms in Disease, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Addenbrookes Hospital, Hills Road, Cambridge CB2 2XY, UK, 1Taisho Laboratory of Functional Genomics, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, 630-0101, Japan, 2Molecular Diagnostic Laboratory, Department of Clinical Biochemistry, Aarhus University Hospital, Brendstrupgaardsvej, 8200 Aarhus N., Denmark and 3University Department of Clinical Neurosciences, Royal Free and University College Medical School, UCL, London NW3 2PF, and Institute of Neurology, Queen Square, London WC1N 3BG, UK
Huntingtons disease (HD) is one of 10 known diseases caused by a (CAG)n trinucleotide repeat expansion that is translated into an abnormally long polyglutamine tract. We have developed stable inducible neuronal (PC12) cell lines that express huntingtin exon 1 with varying CAG repeat lengths under doxycycline (dox) control. The expression of expanded repeats is associated with aggregate formation, caspase-dependent cell death and decreased neurite outgrowth. Post-mitotic cells expressing mutant alleles were more prone to cell death compared with identical cycling cells. To determine early metabolic changes induced by this mutation in cell models, we studied changes in gene expression after 18 h dox induction, using Affymetrix arrays, cDNA filters and adapter-tagged competitive PCR (ATAC-PCR). At this time point there were low rates of inclusion formation, no evidence of mitochondrial compromise and no excess cell death in the lines expressing expanded compared with wild-type repeats. The expression profiles suggest novel targets for the HD mutation and were compatible with impaired cAMP response element (CRE)-mediated transcription, which we confirmed using CRE-luciferase reporter assays. Reduced CRE-mediated transcription may contribute to the loss of neurite outgrowth and cell death in polyglutamine diseases, as these phenotypes were partially rescued by treating cells with cAMP or forskolin.
+ To whom correspondence should be addressed. Tel: +44 1223 762608; Fax: +44 1223 331206; Email: dcr1000@cus.cam.ac.uk The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors.
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