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A proteomic analysis of human bile.

Troels Zakarias Kristiansen1, Jakob Bunkenborg, Mads Gronborg

  • 1McKusick-Nathans Institute of Genetic Medicine and Department of Biological Chemistry, Johns Hopkins University, Baltimore, MD 21205, USA.

Molecular & Cellular Proteomics : MCP
|April 16, 2004
PubMed
Summary

Researchers characterized the human bile proteome, identifying 87 unique proteins and 33 glycosylation sites. This proteomic analysis method can help discover novel biomarkers in body fluids.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Human Physiology

Background:

  • The composition of human bile, particularly its proteome, remains incompletely understood.
  • Identifying proteins in bile is crucial for understanding its physiological roles and potential disease associations.

Purpose of the Study:

  • To comprehensively characterize the human bile proteome.
  • To identify novel proteins and glycosylation sites within human bile.
  • To establish a broadly applicable proteomic analysis strategy for body fluids.

Main Methods:

  • Fractionation of human bile using one-dimensional gel electrophoresis and lectin affinity chromatography.
  • Analysis of fractions using liquid chromatography tandem mass spectrometry (LC-MS/MS).
  • Identification of glycosylation sites via lectin affinity chromatography and enzymatic (18)O-labeling.

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Main Results:

  • Identification of 87 unique proteins in human bile, with a majority not previously reported.
  • Discovery of several novel proteins and known proteins with unknown functions in bile.
  • Characterization of 33 glycosylation sites, providing insights into bile protein post-translational modifications.

Conclusions:

  • The study provides the most comprehensive proteome map of human bile to date.
  • The developed proteomic strategy is versatile and applicable to other body fluids.
  • This methodology, combined with differential tagging, holds potential for identifying cancer biomarkers in various biological samples.