Abstract:
:While numerous strategies exist for biomarker discovery, the bottleneck to product development and routine use at the clinic is in the verification phase of candidate biomarkers. The aim of this study was to establish a robust and high-throughput product ion monitoring (PIM) assay that is potentially capable of rapidly verifying candidates from discovery phase experiments. Using prostate-specific antigen (PSA), a model biomarker, and a routinely used mass spectrometer for discovery platforms, an ion trap (LTQ, Thermo), the utility of this instrument to perform PIM was explored. The proteotypic doubly charged intact peptide LSEPAELTDAVK ( m/ z 637) fragmenting to m/ z 943 (PAELTDAVK) was monitored. A limit of detection of 10 attomoles with a coefficient of variation (CV) of <20% was obtained for a purified recombinant PSA digest. Immunoextraction of endogenous PSA from serum using a monoclonal antibody on a 96-well microtiter plate, followed by PIM on the LTQ, enabled quantification of PSA down to less than 1 ng/mL with a limit of detection of 0.1 ng/mL and CVs < 20%. Mascot searching and ion ratio confirmation further supported the conclusion that the quantified moiety in serum was the PSA peptide. We conclude that this methodology could be adapted quickly and easily to other candidates, thus providing a much needed technology to bridge the gap between discovery and validation platforms.
journal_name
J Proteome Resjournal_title
Journal of proteome researchauthors
Kulasingam V,Smith CR,Batruch I,Buckler A,Jeffery DA,Diamandis EPdoi
10.1021/pr7005999subject
Has Abstractpub_date
2008-02-01 00:00:00pages
640-7issue
2eissn
1535-3893issn
1535-3907journal_volume
7pub_type
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
pub_type: 杂志文章
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
pub_type: 杂志文章
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
pub_type: 杂志文章
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journal_title:Journal of proteome research
pub_type: 杂志文章
doi:10.1021/pr034081k
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
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journal_title:Journal of proteome research
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