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Related Experiment Videos

Methylcholanthrene causes increased thymocyte apoptosis

C T Lutz1, G Browne, C R Petzold

  • 1Department of Pathology, University of Iowa, Iowa City 52242, USA. charles-lutz@uiowa.edu

Toxicology
|August 26, 1998
PubMed
Summary
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Methylcholanthrene (MCA), a polycyclic aromatic hydrocarbon (PAH), causes thymus atrophy through apoptosis, independent of glucocorticoid and aryl hydrocarbon receptors. This immune suppression affects B and T cell responses.

Area of Science:

  • Immunology
  • Toxicology
  • Cell Biology

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) like methylcholanthrene (MCA) are known carcinogens and teratogens.
  • PAHs, including MCA, can suppress B cell and T cell immune responses and induce thymus atrophy.
  • Previous studies indicated MCA's role in immune suppression and thymus atrophy.

Purpose of the Study:

  • To investigate the mechanisms underlying MCA-induced thymus atrophy.
  • To determine the roles of glucocorticoid hormone receptor and aryl hydrocarbon receptor (AhR) in MCA-mediated thymus atrophy.
  • To elucidate the cellular processes involved in MCA-induced thymocyte apoptosis.

Main Methods:

  • MCA treatment in adrenalectomized mice and different mouse strains (C57BL/6, DBA/2) with varying AhR expression.

Related Experiment Videos

  • In situ and ex vivo assays of thymocytes to assess apoptosis.
  • Evaluation of MCA-induced thymus atrophy in genetically modified mice (deficient in TNF-alpha receptor-1 or p53, or overexpressing bcl-2).

    • Main Results:

    • MCA treatment induced thymus atrophy in adrenalectomized mice and in mice with differing AhR expression levels.
    • MCA-mediated thymus atrophy occurs independently of glucocorticoid hormone receptor and AhR.
    • MCA treatment directly induced thymocyte apoptosis, with apoptotic cells being rapidly phagocytosed by thymic macrophages (Mphi).
    • Mice deficient in tumor necrosis factor-alpha receptor-1 or p53, or overexpressing bcl-2, were susceptible to MCA-induced thymus atrophy.

    Conclusions:

    • MCA-induced thymus atrophy is mediated by mechanisms independent of glucocorticoid hormone receptor and AhR.
    • MCA directly triggers thymocyte apoptosis, contributing to thymus atrophy.
    • Specific genetic factors (TNF-alpha receptor-1, p53, bcl-2) influence susceptibility to MCA-induced thymus atrophy.