Development of a specific ELISA for the quantitative study of amino-terminally truncated beta-amyloid peptides.
Clinical studies for disease modifying drugs in Alzheimer's disease are in real need for a sensitive biochemical diagnostic and therapeutic marker. Encouraging results have been obtained by measuring levels of pathology related proteins such as amyloid beta (Abeta) peptides and tau proteins in cerebrospinal fluid (CSF) and plasma of patients. We and other research groups have shown that truncated Abeta11-40 and Abeta11-42 is also a potential marker and that it is produced and deposited in the brains of patients and transgenic mouse models. Because of a lack of quantitative methods for specific measurement of the truncated Abeta it has not been possible to evaluate the true value of this potential biomarker. To overcome these limitations we developed a novel monoclonal antibody-based sandwich enzyme-linked immunosorbent assay (ELISA) to measure Abeta11-40 and Abeta11-42 levels in biological materials. For this purpose monoclonal antibodies were produced that react specifically with amyloid precursor protein (APP) products generated by cleavage at position 11 of the Abeta sequence. The assay has the sensitivity, selectivity and dynamic range to allow specific, direct quantitation of truncated Abeta11 peptides in cell culture medium, cerebrospinal fluid and brain tissue extracts.
El Mouedden
Mohammed
M
Johnson & Johnson Pharmaceutical Research and Development, Division of Janssen Pharmaceutica N.V., Turnhoutseweg 30, B-2340 Beerse, Belgium.
Vandermeeren
Marc
M
Meert
Theo
T
Mercken
Marc
M
D000544:Alzheimer Disease / Q000134:cerebrospinal fluid*; D016229:Amyloid beta-Peptides / Q000134:cerebrospinal fluid*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D006168:Guinea Pigs; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D010446:Peptide Fragments / Q000134:cerebrospinal fluid*; D012680:Sensitivity and Specificity
D016229:Amyloid beta-Peptides; D000911:Antibodies, Monoclonal; D010446:Peptide Fragments