Characterization of antibodies that selectively detect alpha-synuclein in pathological inclusions.

Acta Neuropathologica
Elisa A WaxmanBenoit I Giasson

Abstract

Sensitive detection of alpha-synuclein (alpha-syn) pathology is important in the diagnosis of disorders like Parkinson's disease, dementia with Lewy bodies, and multiple system atrophy and in providing better insights into the etiology of these diseases. Several monoclonal antibodies that selectively react with aggregated alpha-syn in pathological inclusions and reveal extensive and underappreciated alpha-syn pathology in the brains of diseased patients were previously reported by Duda et al. (Ann Neurol 52:205-210, 2002). We sought to characterize the specificity of some of these antibodies (Syn 505, Syn 506 and Syn 514); using C-terminal and N-terminal truncations of alpha-syn, all three antibodies were determined to require N-terminal epitopes that minimally comprise amino acids 2-4, but possibly extend to amino acid 12 of alpha-syn. The selectivity of these antibodies was further assessed using biochemical analysis of human brains and reactivity to altered recombinant alpha-syn proteins with duplication variants of amino acids 1-12. In addition, by expressing wild-type or a double mutant (E46K/A53T) of alpha-syn in cultured cells and by comparing their immunoreactivities to another antibody (SNL-4), which has a similar prim...Continue Reading

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