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1.
  • Wang, Jijing, et al. (författare)
  • First Immunoassay for Measuring Isoaspartate in Human Serum Albumin
  • 2021
  • Ingår i: Molecules. - : MDPI. - 1431-5157 .- 1420-3049. ; 26:21
  • Tidskriftsartikel (refereegranskat)abstract
    • Isoaspartate (isoAsp) is a damaging amino acid residue formed in proteins mostly as a result of spontaneous deamidation of asparaginyl residues. An association has been found between isoAsp in human serum albumin (HSA) and Alzheimer’s disease (AD). Here we report on a novel monoclonal antibody (mAb) 1A3 with excellent specificity to isoAsp in the functionally important domain of HSA. Based on 1A3 mAb, an indirect enzyme-linked immunosorbent assay (ELISA) was developed, and the isoAsp occupancy in 100 healthy plasma samples was quantified for the first time, providing the average value of (0.74 ± 0.13)%. These results suggest potential of isoAsp measurements for supplementary AD diagnostics as well as for assessing the freshness of stored donor blood and its suitability for transfusion.
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2.
  • Wang, Jijing, et al. (författare)
  • Testing the link between isoaspartate and Alzheimer's disease etiology
  • 2023
  • Ingår i: Alzheimer's & Dementia. - : John Wiley & Sons. - 1552-5260 .- 1552-5279. ; 19:4, s. 1491-1502
  • Tidskriftsartikel (refereegranskat)abstract
    • Isoaspartate (isoAsp) is a damaging amino acid residue formed in proteins as a result of spontaneous deamidation. IsoAsp disrupts protein structures, making them prone to aggregation. Here we strengthened the link between isoAsp and Alzheimer's disease (AD) by novel approaches to isoAsp analysis in human serum albumin (HSA), the most abundant blood protein and a major carrier of amyloid beta (A beta) and phosphorylated tau (p-tau) in blood. We discovered a reduced amount of anti-isoAsp antibodies (P < 0.0001), an elevated isoAsp level in HSA (P < 0.001), more HSA aggregates (P < 0.0001), and increased levels of free A beta (P < 0.01) in AD blood compared to controls. We also found that deamidation significantly reduces HSA capacity to bind with A beta and p-tau (P < 0.05). These suggest the presence in AD of a bottleneck in clearance of A beta and p-tau, leading to their increased concentrations in the brain and facilitating their aggregations there.
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