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Linear time-invariant Systems01:23

Linear time-invariant Systems

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A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
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Related Experiment Video

Updated: Feb 2, 2026

Development of a Larval Zebrafish Infection Model for Clostridioides difficile
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Clostridioides difficile Activates Human Mucosal-Associated Invariant T Cells.

Isabel Bernal1,2,3, Julia Danielle Hofmann4, Björn Bulitta3

  • 1Institute of Medical Microbiology and Hospital Hygiene, Infection Immunology, Otto von Guericke University Magdeburg, Magdeburg, Germany.

Frontiers in Microbiology
|November 10, 2018
PubMed
Summary

Clostridioides difficile infection activates mucosal-associated invariant T (MAIT) cells via riboflavin metabolites. Hypervirulent strains are most potent, linking C. difficile metabolism to T cell immunity and gut inflammation.

Keywords:
C. difficile infectionMAIT cellsMR1-antigen presentationmucosal immunityriboflavin synthesis

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Area of Science:

  • Immunology
  • Microbiology
  • Gastroenterology

Background:

  • Clostridioides difficile infection (CDI) causes severe intestinal inflammation.
  • The immunological mechanisms of CDI-related immunopathology are not fully understood.

Purpose of the Study:

  • To investigate the role of mucosal-associated invariant T (MAIT) cells in C. difficile infection.
  • To explore the interaction between C. difficile metabolism and host immune responses.

Main Methods:

  • Analysis of MAIT cell activation by different C. difficile strains (non-toxigenic, RT027, RT023).
  • Confirmation of riboflavin synthesis in C. difficile.
  • Assessment of MAIT cell responses (CD69, IFNγ, granzyme B, perforin) upon activation by C. difficile.
  • Investigation of cytokine-induced (IL-12, IL-18) lytic granule release.

Main Results:

  • Both non-toxigenic and hypervirulent C. difficile strains induced an effector phenotype in MAIT cells.
  • C. difficile produces riboflavin metabolites that activate MAIT cells via MR1.
  • Activated MAIT cells expressed CD69, IFNγ, granzyme B, and perforin, with lytic granule release mainly induced by IL-12 and IL-18.
  • Hypervirulent C. difficile strains were most effective in activating MAIT cells.

Conclusions:

  • MAIT cell activation is linked to C. difficile metabolism and contributes to CDI immunopathology.
  • This study provides the first evidence of a connection between C. difficile metabolism and human innate T cell immunity.