Glycobiology Advance Access published online on May 4, 2007
Glycobiology, doi:10.1093/glycob/cwm047
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Published by Oxford University Press 2007
High-Throughput Carbohydrate Microarray Profiling of 27 Antibodies Demonstrates Widespread Specificity Problems
Laboratory of Medicinal Chemistry, Center for Cancer Research, National Cancer Institute, 376 Boyles St. Bldg 376, Rm 109, Frederick, MD 21702
* To whom correspondence should be addressed. Jeffrey C. Gildersleeve, Laboratory of Medicinal Chemistry, Center for Cancer Research, National Cancer Institute, 376 Boyles St., Bldg 376, Rm 109, Frederick, MD 21702. Phone: 301-846-5699; Fax: 301-846-6033 Email: gildersleevej{at}ncifcrf.gov
Received on February 7, 2007; revised on April 16, 2007; accepted on April 17, 2007
Progress towards understanding the biological roles of carbohydrates has been remarkably slow and efforts to exploit this class of biopolymers as diagnostic and therapeutic targets have proven extremely challenging. Both basic and clinical research rely heavily on identifying and monitoring expression levels of carbohydrates. Over the last 30 years, the majority of expression information has been derived from antibody and lectin binding studies. Using a carbohydrate microarray containing 80 different glycans and glycoproteins, the specificities of 27 anti-glycan antibodies were evaluated including antibodies to histo-blood group A, B, and H antigens (81FR2.2, CLCP-19B, B389, 92FR-A2, B480, B460, B376, and B393), Lewis antigens (7LE, 15C02, 28, ZC-18C, 121SLE, CA199.02, PR.5C5, 2-25LE, BR55, T174, T218, F3, A70-C/C8, FR4A5, and K21) and other tumor-associated antigens (B389, 1A4, B1.1, and 5B5). In total, evaluation of over 2000 individual carbohydrate-protein interactions was carried out. More than half of the antibodies considered to be specific for their designated antigen were found to cross-react with other glycans. The cross-reactive glycans could be mistaken for the designated antigen in biopsy samples or other biological samples leading to inaccurate conclusions.
Key words: Glycan Array / Antibodies / Blood Group Antigens / Lewis Antigens / Tumor-Associated Carbohydrate Antigens
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