期刊
JOURNAL OF ALZHEIMERS DISEASE
卷 50, 期 2, 页码 517-525出版社
IOS PRESS
DOI: 10.3233/JAD-150696
关键词
Amyloid; amyloid-beta; conformation; monoclonal antibody; IAPP; synuclein
资金
- NIH [AG 033069, AG00538]
- Cure Alzheimer's fund
- NATIONAL INSTITUTE ON AGING [R01AG033069, P01AG000538] Funding Source: NIH RePORTER
Recently we reported that several monoclonal antibodies that recognize linear segments of amyloid-beta (A beta) also recognize amyloid fibrils, but not monomers of unrelated sequences, indicating that recognition of a linear sequence segment is not a reliable indicator of sequence specificity. We asked whether any of the commonly used commercially available A beta antibodies also recognize fibrils of unrelated sequence. Here we report that 4G8, which recognizes residues 18-23 of the A beta sequence and is widely believed to be sequence-specific, also recognizes fibrils formed from alpha-synuclein and islet amyloid polypeptide (IAPP). The recognition of amyloid fibrils is aggregation-dependent because 4G8 does not recognize alpha-synuclein or IAPP monomer. 4G8 also stains fibrillar alpha-synuclein aggregates in human multiple system atrophy brain where it colocalizes with anti-alpha-synuclein monoclonal antibody LB509 immunoreactivity. We also found that LB509 recognizes A beta fibrils, but not monomer, indicating that generic epitope-reactive antibodies are also produced in response to alpha-synuclein immunization. Taken together, our results indicate that generic fibril conformational epitope specificity may be a pervasive property among monoclonal antibodies raised against amyloid-forming antigens and that the specificity of their immunoreactivity should be rigorously established and otherwise interpreted with caution.
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