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Related Experiment Videos

Comparing intestinal versus diffuse gastric cancer using a PEFF-oriented proteomic pipeline.

Helisa Helena Wippel1, Marlon Dias Mariano Santos1, Milan Avila Clasen1

  • 1Computational Mass Spectrometry & Proteomics Group, Carlos Chagas Institute, Fiocruz - Paraná, Brazil.

Journal of Proteomics
|October 17, 2017
PubMed
Summary

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Comparing gastric cancer proteomic profiles revealed distinct molecular differences between intestinal and diffuse types, even within the same anatomical region. This study highlights key proteins and pathways specific to each cancer subtype.

Area of Science:

  • Oncology
  • Proteomics
  • Molecular Biology

Background:

  • Gastric cancer is a leading cause of cancer death globally.
  • Tumor anatomical region significantly impacts proteomic profiles, potentially confounding disease-specific findings.
  • Intestinal and diffuse gastric cancer subtypes exhibit distinct characteristics but their molecular mechanisms remain poorly understood.

Purpose of the Study:

  • To compare the proteomic profiles of intestinal and diffuse gastric adenocarcinoma from the same anatomical region (corpus).
  • To identify subtype-specific proteins and enriched pathways in gastric cancer.
  • To refine proteomic analysis pipelines for enhanced identification of post-translational modifications and mutations.

Main Methods:

  • Isobaric labeling (iTRAQ) for peptide quantification.
Keywords:
Diffuse adenocarcinomaGastric cancerIntestinal adenocarcinomaPEFFQuantitative proteomicsiTRAQ

Related Experiment Videos

  • Multi-dimensional liquid chromatography (HILIC and reversed-phase nano-LC) for fractionation.
  • High-resolution mass spectrometry (Q-Exactive Plus) coupled with an updated PatternLab pipeline utilizing the Comet-PEFF search engine.

    • Main Results:

    • Identified significant differences in proteomic profiles between intestinal and diffuse gastric cancer subtypes.
    • Disclosed key proteins such as apolipoprotein B-100, S100, and 14-3-3 proteins.
    • Highlighted distinct biological pathways enriched in each cancer type, underscoring subtype-specific molecular mechanisms.

    Conclusions:

    • Proteomic analysis must account for tumor anatomical region to avoid misattributing variations to disease specificity.
    • This study provides crucial insights into the molecular heterogeneity of gastric cancer subtypes.
    • The developed PEFF-tailored proteomic pipeline enhances protein identification and characterization.