Ulcerative colitis: functional analysis of the in-depth proteome.

Area of Science:

• Gastroenterology
• Proteomics
• Molecular Biology

Background:

• Ulcerative colitis (UC) is a major form of inflammatory bowel disease.
• The exact cause and pathophysiology of UC remain incompletely understood.
• This study aims to identify critical pathophysiological features in UC using proteomics.

Purpose of the Study:

• To identify key pathophysiological features in ulcerative colitis (UC) using deep proteomics.
• To compare protein abundance differences between UC patients and healthy controls.
• To uncover novel molecular mechanisms underlying UC.

Main Methods:

• Collected colon mucosa biopsies from untreated UC patients and healthy controls.
• Performed quantitative proteomics using bottom-up analysis with MaxQuant.
• Analyzed proteome data with Perseus and enrichment analysis with ClueGO.

Main Results:

• Generated the deepest proteome dataset from colon mucosa biopsies to date (8562 identified proteins).
• Identified decreased protein abundances in UC for metallothioneins, PPAR-inducible proteins, and collagen.
• Observed increased abundances in UC for immune response and endoplasmic reticulum protein processing, including unfolded protein response and signal peptidase complex proteins.

Conclusions:

• This explorative study highlights significantly affected functions in UC tissue.
• The findings substantially complement existing knowledge on UC pathophysiology.
• A novel discovery is the decreased abundance of signal peptidase complex proteins in UC.