Increased plasma amyloid beta protein 1-42 levels in Down syndrome
P D Mehta1, A J Dalton, S P Mehta
1Department of Immunology, New York State Institute for Basic Research, Staten Island 10314-6399, USA. pdmehta@worldnet.att.net
Abstract:
Amyloid beta protein 1-40 (A beta40) and A beta42 levels were quantitated in plasma from 43 persons with Down syndrome (DS; 26-68 years of age), 43 age-matched normal controls, and 19 non-DS mentally retarded (MR) persons (26-91 years of age) by using a sandwich enzyme linked immunosorbent assay. A beta40 levels were higher in DS and MR than controls, but were similar between DS and MR groups. A beta42 levels were higher in DS than controls or MR persons. The ratios of A beta42/A beta40 were higher in DS than controls or MR persons. The findings are consistent with those seen in DS brains.
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