Quantitative plasma proteome analysis reveals aberrant level of blood coagulation-related proteins in nasopharyngeal carcinoma

Pei Hua Peng, Chih Ching Wu, Shu Chen Liu, Kai Ping Chang, Chi De Chen, Ya Ting Chang, Chia Wei Hsu, Yu Sun Chang, Jau Song Yu

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Nasopharyngeal carcinoma (NPC), one of the most common cancers in Southeast Asia, is not easily diagnosed until advanced stages. To discover potential biomarkers for improving NPC diagnosis, we herein identified the aberrant plasma proteins in NPC patients. We first removed the top-seven abundant proteins from plasma samples of healthy controls and NPC patients, and then labeled the samples with different fluorescent cyanine dyes. The labeled samples were then mixed equally and fractionated with ion-exchange chromatography followed by SDS-PAGE. Proteins showing altered levels in NPC patients were identified by in-gel tryptic digestion and LC-MS/MS. When the biological roles of the 45 identified proteins were assessed via MetaCore™ analysis, the blood coagulation pathway emerged as the most significantly altered pathway in NPC plasma. Plasma kallikrein (KLKB1) and thrombin-antithrombin III complex (TAT) were chosen for evaluation as the candidate NPC biomarkers because of their involvement in blood coagulation. ELISAs confirmed the elevation of their plasma levels in NPC patients versus healthy controls. Western blot and activity assays further showed that the KLKB1 active form was significantly increased in NPC plasma. Collectively, our results identified the significant alteration of blood coagulation pathway in NPC patients, and KLKB1 and TAT may represent the potential NPC biomarkers.

Original languageEnglish
Pages (from-to)744-757
Number of pages14
JournalJournal of Proteomics
Volume74
Issue number5
DOIs
StatePublished - 1 May 2011

Keywords

  • Blood coagulation
  • Nasopharyngeal carcinoma
  • Plasma kallikrein
  • Plasma proteome
  • Protein fractionation
  • Tumor marker

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