期刊
MOLECULAR PSYCHIATRY
卷 14, 期 11, 页码 1004-1016出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/mp.2009.10
关键词
Alzheimer; IL-33; brain expression; polymorphism; CAA
资金
- Ministere de l'enseignement superieur et de la Recherche (MESR)
- Alzheimer's association [IIRG-06-25487]
- France Alzheimer Association
- Pasteur Institute of Lille
- Nord-Pas de Calais
- Genoscreen
- INSERM
- genopole of Lille
- CPER-neuroscience
- US National Institute on Aging [AG13672, AG05133]
- Fondation pour la Recherche Medicale
- Caisse Nationale Maladie des Travailleurs Salaries
- Direction Generale de la Sante
- MGEN
- Institut de la Longevite
- Agence Francaise de Securite Sanitaire des Produits de Sante
- Aquitaine and Bourgogne Regional Councils
- jont French Ministry of Research/INSERM
- Eisai
The only recognized genetic determinant of the common forms of Alzheimer's disease (AD) is the epsilon 4 allele of the apolipoprotein E gene (APOE). To identify new candidate genes, we recently performed transcriptomic analysis of 2741 genes in chromosomal regions of interest using brain tissue of AD cases and controls. From 82 differentially expressed genes, 1156 polymorphisms were genotyped in two independent discovery subsamples (n = 945). Seventeen genes exhibited at least one polymorphism associated with AD risk, and following correction for multiple testing, we retained the interleukin (IL)-33 gene. We first confirmed that the IL-33 expression was decreased in the brain of AD cases compared with that of controls. Further genetic analysis led us to select three polymorphisms within this gene, which we analyzed in three independent case-control studies. These polymorphisms and a resulting protective haplotype were systematically associated with AD risk in non-APOE epsilon 4 carriers. Using a large prospective study, these associations were also detected when analyzing the prevalent and incident AD cases together or the incident AD cases alone. These polymorphisms were also associated with less cerebral amyloid angiopathy (CAA) in the brain of non-APOE epsilon 4 AD cases. Immunohistochemistry experiments finally indicated that the IL-33 expression was consistently restricted to vascular capillaries in the brain. Moreover, IL-33 overexpression in cellular models led to a specific decrease in secretion of the A beta(40) peptides, the main CAA component. In conclusion, our data suggest that genetic variants in IL-33 gene may be associated with a decrease in AD risk potentially in modulating CAA formation. Molecular Psychiatry (2009) 14, 1004-1016; doi:10.1038/mp.2009.10; published online 10 February 2009
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