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Time-resolved cellular effects induced by TcdA from Clostridium difficile.

Nelli Jochim1, Ralf Gerhard, Ingo Just

  • 1Hannover Medical School, Institute of Toxicology, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.

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Clostridium difficile toxin A (TcdA) alters colon cell proteomes, impacting cytoskeleton and signaling pathways. Quantitative proteome analysis revealed specific protein changes after TcdA exposure, offering insights into toxin effects.

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Area of Science:

  • Proteomics
  • Cellular Biology
  • Microbiology

Background:

  • Clostridium difficile is a major cause of infectious diarrhea and colitis.
  • Toxins A (TcdA) and B (TcdB) are key virulence factors, inactivating host cell GTPases via glucosylation.
  • Toxin activity leads to cytoskeleton disruption and cell death.

Purpose of the Study:

  • To investigate proteome alterations in Caco-2 colon cells treated with recombinant wild-type TcdA (rTcdA-wt) or a mutant TcdA.
  • To quantitatively analyze changes in protein abundance using the isotope-coded protein label (ICPL) approach.

Main Methods:

  • Quantitative proteomic analysis using ICPL.
  • Liquid chromatography/electrospray ionization mass spectrometry (LC/ESI-MS) for protein identification.
  • Analysis at two time points (5h and 24h) post-toxin treatment.

Main Results:

  • rTcdA-wt treatment altered 150 proteins at 5h and 61 proteins at 24h.
  • A glucosyltransferase-deficient mutant (rTcdA-mut) affected fewer proteins (50 at 5h, none at 24h).
  • Affected proteins were involved in signaling, cytoskeleton, cell-cell contacts, translation, and metabolism.

Conclusions:

  • LC/MS and ICPL provide comprehensive proteome data on cellular responses to TcdA.
  • The study offers new insights into the cellular mechanisms of clostridial glucosylating toxins (CGT).