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Related Experiment Videos

Thyroxine administration prevents streptococcal cell wall-induced inflammatory responses

P A Rittenhouse1, E Redei

  • 1Department of Psychiatry, University of Pennsylvania, Philadelphia 19104, USA.

Endocrinology
|April 1, 1997
PubMed
Summary

Hypothyroidism exacerbates inflammation in a rheumatoid arthritis model, while hyperthyroidism offers protection. This suggests a link between thyroid hormones and the hypothalamic-pituitary-adrenal axis in regulating inflammatory responses.

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Area of Science:

  • Endocrinology
  • Immunology
  • Rheumatology

Background:

  • Streptococcal cell wall (SCW) administration models rheumatoid arthritis, with inflammation severity influenced by glucocorticoid levels.
  • Low glucocorticoids, often seen in hypothyroidism, can amplify SCW-induced inflammation.
  • The hypothalamic-pituitary-adrenal (HPA) axis and thyroid axis interactions in inflammation are not fully understood.

Purpose of the Study:

  • To investigate the impact of experimentally induced hypothyroidism and hyperthyroidism on inflammatory responses to SCW.
  • To explore the relationship between thyroid status, glucocorticoid levels, and the HPA axis activity.
  • To identify potential therapeutic targets for rheumatoid arthritis and related inflammatory disorders.

Main Methods:

  • Adult female rats were assigned to control, hyperthyroid (L-T4), or hypothyroid (6-propyl-thiouracil) groups for 7 weeks.

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  • Hormonal levels (TSH, ACTH, corticosterone) and gene expression (preproTRH, POMC) were measured.
  • Inflammatory markers (macrophage inflammatory protein-1alpha, interleukin-1beta mRNA) were assessed post-SCW administration via Northern blot.

    • Main Results:

    • Hypothyroidism increased TSH and preproTRH mRNA while decreasing POMC mRNA, ACTH, and corticosterone.
    • Hyperthyroidism yielded opposite results, indicating altered HPA axis function.
    • SCW administration led to greater inflammatory marker expression in hypothyroid rats compared to controls.
    • Hyperthyroid rats exhibited significantly inhibited inflammatory markers following SCW challenge.

    Conclusions:

    • Hyperthyroidism, associated with elevated glucocorticoids, confers protection against SCW-induced inflammation.
    • Hypothyroidism exacerbates inflammation, likely due to diminished HPA axis activity.
    • An inverse relationship between preproTRH and pituitary-adrenal function suggests cross-talk between the thyroid and HPA axes, offering potential therapeutic insights for inflammatory diseases.