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Chronic helminth infections induce immunomodulation: consequences and mechanisms.

Elly van Riet1, Franca C Hartgers, Maria Yazdanbakhsh

  • 1Department of Parasitology, Leiden University Medical Centre, Leiden, The Netherlands. p.h.van_riet@lumc.nl

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Chronic helminth infections modulate immune responses, potentially reducing allergies but impairing vaccine efficacy. Helminth molecules offer therapeutic potential for inflammatory diseases by targeting immune pathways.

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Area of Science:

  • Immunology
  • Parasitology
  • Molecular Medicine

Background:

  • Over a billion people globally are chronically infected with helminths, leading to significant morbidity.
  • Helminth infections induce T helper 2 and regulatory immune responses, crucial for parasite survival and pathology limitation.
  • These immune modulations may suppress responses to other antigens, impacting allergies, autoimmune diseases, and vaccine effectiveness.

Purpose of the Study:

  • To explore the immunological impact of helminth infections on host responses.
  • To investigate the potential therapeutic applications of helminth-derived molecules for inflammatory conditions.
  • To understand how helminth infections affect vaccine efficacy in endemic regions.

Main Methods:

  • Analysis of immune skewing towards T helper 2 and regulatory responses in helminth infections.
  • Identification of helminth-derived molecules that modulate dendritic cell and Toll-like receptor (TLR) signaling.
  • Evaluation of the impact of helminth infections on responses to non-helminth antigens and vaccines.

Main Results:

  • Chronic helminth infections are characterized by a shift towards T helper 2 and regulatory immune responses.
  • Helminth molecules can induce these responses by modulating dendritic cells, sometimes via TLR signaling.
  • Helminth infections may temper immune responses to allergens, self-antigens, and vaccines.

Conclusions:

  • Helminth-derived molecules hold therapeutic promise for allergies and inflammatory diseases.
  • Understanding helminth-induced immune modulation is critical for improving vaccine efficacy in endemic areas.
  • Targeting these pathways could enhance vaccine responses or control inflammation.