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Interferons in multiple sclerosis: warnings from experiences

A Billiau1

  • 1Rega Institute, University of Leuven, Belgium.

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|June 1, 1995
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Summary

Targeting single cytokines for autoimmune diseases may yield unexpected results. Animal models show cytokine interventions can worsen disease, contrasting with clinical trial expectations for therapies like interferon gamma (IFN-γ).

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Area of Science:

  • Immunology
  • Autoimmune Diseases
  • Therapeutic Interventions

Background:

  • Single cytokine targeting is a key strategy for autoimmune disease therapy.
  • Animal models are crucial for understanding immune network interventions.
  • Clinical trial outcomes sometimes diverge from preclinical findings.

Purpose of the Study:

  • To review evidence from animal models regarding cytokine-targeted therapies in autoimmune diseases.
  • To highlight discrepancies between animal model results and human clinical trials.
  • To investigate paradoxical effects of cytokine neutralization in vivo.

Main Methods:

  • Review of existing literature on animal models of autoimmune diseases.
  • Analysis of experimental data from models like experimental autoimmune encephalitis (EAE) in mice.
  • Examination of the effects of administering cytokines and anti-cytokine antibodies.

Main Results:

  • Interferon gamma (IFN-γ) administration reduced disease severity in an EAE mouse model, while anti-IFN-γ antibodies aggravated it.
  • Clinical trials with IFN-γ showed disease relapses, contradicting model findings.
  • Neutralizing anti-interleukin-6 (IL-6) antibodies increased IL-6 serum titers in mice due to immune complex formation.

Conclusions:

  • Animal models may not accurately predict human responses to cytokine-based therapies.
  • Cytokine neutralization can have complex and sometimes adverse effects, such as immune complex formation.
  • Therapeutic strategies targeting single cytokines require careful consideration of potential paradoxical outcomes.

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