Lectin precipitation using phytohemagglutinin-L(4) coupled to avidin-agarose for serological biomarker discovery in colorectal cancer.

Abstract

N-acetylglucosaminyltransferase V (GnT-V) has been reported to be upregulated in malignant cancer cells, and its targets have been sought after with regard to biomarker identification. The low capacity and high false positive rates of 2-DE gel-based lectin blots using phytohemagglutinin-L(4) (L-PHA) prompted us to develop a novel protocol for identifying GnT-V targets, in which serum proteins were subjected to immunodepletion, alkylation, and lectin precipitation using L-PHA coupled to avidin-agarose bead complexes, and tryptic digestion. Proteins captured by L-PHA conjugates were analyzed by a nano-LC-FT-ICR/LTQ MS. Here, we report 26 candidate biomarkers for colorectal cancer (CRC) that show 100% specificity and sensitivities of greater than 50%. Not only can these candidate proteins be used as analytes for validation, but the novel protocol described herein can be applied to biomarker discovery in nonCRCs.

• Authors: Yong-Sam Kim, Ok Lye Son, Ju Yeon Lee, Sun Hee Kim, Sejeong Oh, Yoon Suk Lee, Cheorl-Ho Kim, Jong Shin Yoo, Jeong-Hwa Lee, Eiji Miyoshi, Naoyuki Taniguchi, Samir M Hanash, Hyang Sook Yoo, Jeong Heon Ko
• Journal: Proteomics (Proteomics) Vol. 8 Issue 16 Pg. 3229-35 (Aug 2008) ISSN: 1615-9861 [Electronic] Germany
• PMID: 18633972 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Biomarkers, Tumor
• Lectins
• Phytohemagglutinins
• Avidin
• Sepharose

Topics

• Avidin (chemistry)
• Biomarkers, Tumor (blood, chemistry)
• Chemical Precipitation
• Chromatography, Affinity
• Colorectal Neoplasms (blood)
• Humans
• Lectins (chemistry)
• Mass Spectrometry
• Phytohemagglutinins (chemistry)
• Sepharose (chemistry)