Abstract: The present invention provides monoclonal antibodies which specifically recognize the shorter A? peptides obtained after cleavage of the APP protein mediated by ?-secretase, i.e. the A?-peptide fragments A?1-37, A?3-37, A?3p-37, A?1-37 and A?11p-37, and other like fragments ending at the 37th amino acid of APP, hereinafter also referred to as the A?x-37 peptides. It further provides hybridoma cells producing the monoclonal antibodies as well as methods for producing the antibodies and the hybridoma cells; and an immunoassay for an A?x-37 peptide by a competitive method or a sandwich method using the antibody of the present invention; and methods for measuring the level of A?x-37 peptides in a sample, such as a biological sample.

Abstract: The present invention provides monoclonal antibodies which specifically recognize the shorter A? peptides obtained after cleavage of the APP protein mediated by ?-secretase, i.e. the A?-peptide fragments A?1-37, A?3-37, A?3p-37, A?1-37 and A?11p-37, and other like fragments ending at the 37th amino acid of APP, hereinafter also referred to as the A?x-37 peptides. It further provides hybridoma cells producing the monoclonal antibodies as well as methods for producing the antibodies and the hybridoma cells; and an immunoassay for an A?x-37 peptide by a competitive method or a sandwich method using the antibody of the present invention; and methods for measuring the level of A?x-37 peptides in a sample, such as a biological sample.