The present invention relates to an improved
antibody specifically binding to
amyloid-β oligomers (AβOs). Specifically, the present invention relates to an improved form of the
antibody W20. Compared with the
antibody W20, the improved form of the antibody W20 has a significantly improved affinity to AβOs, and can more significantly inhibit the aggregation of Aβ and the AβOs-induced
toxicity of
nerve cells, more effectively improve the
cognition and
memory functions of an Alzheimer's
disease model mouse, and reduce
pathological changes in the brain of the mouse. The improved form of the antibody can specifically bind to oligomers of an
amyloid-β, α-
synuclein, mHTT and SOD 1, can inhibit the aggregation and
cytotoxicity of various amyloids, and has a better potential for treating various
amyloid diseases, such as Parkinson's
disease, Huntington's
disease, and
amyotrophic lateral sclerosis, than the antibody W20. The improved form of the antibody can specifically bind to a highly toxic amyloid
protein oligomer Aβo*3F, and has a better AD diagnosis value. The
amino acid sequence of the antibody W20 is as shown in SEQ ID NO: 1.