Abstract:
:In a transgenic mouse model of the neurodegenerative disorder Huntington's disease (HD), age-dependent neurologic defects are accompanied by progressive alterations in glucose tolerance that culminate in the development of diabetes mellitus and insulin deficiency. Pancreatic islets from HD transgenic mice express reduced levels of the pancreatic islet hormones insulin, somatostatin, and glucagon and exhibit intrinsic defects in insulin production. Intranuclear inclusions accumulate with aging in transgenic pancreatic islets, concomitant with the decline in glucose tolerance. HD transgenic mice develop an age-dependent reduction of insulin mRNA expression and diminished expression of key regulators of insulin gene transcription, including the pancreatic homeoprotein PDX-1, E2A proteins, and the coactivators CBP and p300. Disrupted expression of a subset of transcription factors in pancreatic beta cells by a polyglutamine expansion tract in the huntingtin protein selectively impairs insulin gene expression to result in insulin deficiency and diabetes. Selective dysregulation of gene expression in triplet repeat disorders provides a mechanism for pleiotropic cellular dysfunction that restricts the toxicity of ubiquitously expressed proteins to highly specialized subpopulations of cells.
journal_name
Neurobiol Disjournal_title
Neurobiology of diseaseauthors
Andreassen OA,Dedeoglu A,Stanojevic V,Hughes DB,Browne SE,Leech CA,Ferrante RJ,Habener JF,Beal MF,Thomas MKdoi
10.1006/nbdi.2002.0562keywords:
subject
Has Abstractpub_date
2002-12-01 00:00:00pages
410-24issue
3eissn
0969-9961issn
1095-953Xpii
S0969996102905620journal_volume
11pub_type
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