Abstract:
:alpha2-Macroglobulin (A2M) is a proteinase inhibitor found in association with senile plaques (SP) in Alzheimer's disease (AD). A2M has been implicated biochemically in binding and degradation of the amyloid beta (Abeta) protein which accumulates in SP. We studied the relationship between Alzheimer's disease and a common A2M polymorphism, Val1000 (GTC)/Ile1000 (ATC), which occurs near the thiolester active site of the molecule. In an initial exploratory data set (90 controls and 171 Alzheimer's disease) we noted an increased frequency of the G/G genotype from 0.07 to 0.12. We therefore tested the hypothesis that the G/G genotype is over-represented in Alzheimer's disease in an additional independent data set: a group of 359 controls and 566 Alzheimer's disease patients. In the hypothesis testing cohort, the G/G genotype increased from 0.07 in controls to 0.12 in Alzheimer's disease (P < 0.05, Fisher's exact test). The odds ratio for Alzheimer's disease associated with the G/G genotype was 1.77 (1.16-2.70, P < 0.01) and in combination with APOE4 was 9.68 (95% CI 3.91-24.0, P < 0.001). The presence of the G allele was associated with an increase in Abeta burden in a small series. The A2M receptor, A2M-r/LRP, is a multifunctional receptor whose ligands include apolipoprotein E and the amyloid precursor protein. These four proteins have each been genetically linked to Alzheimer's disease, suggesting that they may participate in a common disease pathway.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Liao A,Nitsch RM,Greenberg SM,Finckh U,Blacker D,Albert M,Rebeck GW,Gomez-Isla T,Clatworthy A,Binetti G,Hock C,Mueller-Thomsen T,Mann U,Zuchowski K,Beisiegel U,Staehelin H,Growdon JH,Tanzi RE,Hyman BTdoi
10.1093/hmg/7.12.1953subject
Has Abstractpub_date
1998-11-01 00:00:00pages
1953-6issue
12eissn
0964-6906issn
1460-2083pii
ddb240journal_volume
7pub_type
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