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Related Experiment Videos

Mycobacterial glycolipid cord factor trehalose 6,6'-dimycolate causes a decrease in serum cortisol during the

Jeffrey K Actor1, Jessica Indrigo, Christopher M Beachdel

  • 1Department of Pathology and Laboratory Medicine, University of Texas-Houston Medical School, Houston, TX 77030, USA. Jeffrey.K.Actor@uth.tmc.edu

Neuroimmunomodulation
|May 22, 2003
PubMed
Summary

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Mycobacterial glycolipid trehalose 6,6'-dimycolate (TDM) reduces serum cortisol, enabling granuloma formation in mice. High cortisol levels in A/J mice impair this immune response, offering insights into tuberculosis immunopathology.

Area of Science:

  • Immunology
  • Endocrinology
  • Microbiology

Background:

  • Mycobacterial glycolipids, like trehalose 6,6'-dimycolate (TDM), modulate host immune responses.
  • Cortisol plays a critical role in regulating inflammation and immune cell function.
  • Granuloma formation is a key host defense mechanism against mycobacterial infections.

Purpose of the Study:

  • To investigate the effect of TDM on serum cortisol levels in mice.
  • To explore the relationship between cortisol levels and the development of TDM-induced lung granulomas.
  • To understand the immunopathological implications of TDM-mediated cortisol modulation in the context of tuberculosis.

Main Methods:

  • Intravenous administration of purified TDM to C57BL/6 and A/J mice.
  • Measurement of serum cortisol levels at various time points post-TDM administration.

Related Experiment Videos

  • Assessment of lung granuloma formation and immune cell responses (cytokine and chemokine mRNA induction).
  • Histological examination of suprarenal glands in A/J mice.
  • In vivo modulation of immune response using hydrocortisone treatment in C57BL/6 mice.

    • Main Results:

    • TDM administration rapidly decreased serum cortisol in C57BL/6 mice, coinciding with granuloma formation and immune gene induction.
    • Optimal granuloma formation and immune responsiveness were observed only after significant cortisol reduction.
    • Hydrocortisone treatment abolished inflammatory responses in C57BL/6 mice.
    • A/J mice, exhibiting impaired granuloma formation, had higher baseline cortisol levels and altered cortisol kinetics upon TDM administration.
    • A/J mice showed suprarenal gland abnormalities and dysregulated cytokine responses, potentially linked to high constitutive cortisol.

    Conclusions:

    • TDM influences serum cortisol levels, impacting the host's ability to mount an effective granulomatous response.
    • Elevated cortisol, as seen in A/J mice, can suppress pulmonary immunoresponsiveness and hinder granuloma initiation.
    • This study highlights a unique mechanism by which a mycobacterial glycolipid modulates host cortisol, with significant implications for tuberculosis immunopathology.