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Can helminth antigens be exploited therapeutically to downregulate pathological Th1 responses?
Tim Raine1, Paola Zaccone, David W Dunne
1Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK.
Current Opinion in Investigational Drugs (London, England : 2000)
|December 3, 2004
Summary
Helminth infections may treat Th1 autoimmune diseases by modulating the immune system. Research in animal models shows promise for using helminth products to develop new therapies for human autoimmune conditions.
Area of Science:
- Immunology
- Parasitology
- Autoimmune Disease Research
Background:
- Helminth infections are common in developing countries, where Th1 autoimmune diseases are rare, suggesting an immunomodulatory role for helminths.
- A hypothesis proposes that helminth infections influence the immune system, leading to exploration of helminth antigens for treating autoimmune diseases.
- Initial studies utilized a Th1/Th2 paradigm, suggesting Th2-polarizing helminth infections correct Th1 autoimmune imbalances, though allergies are surprisingly uncommon.
Purpose of the Study:
- To review findings from animal models on the use of helminth infection and products for preventing Th1-mediated autoimmune diseases.
- To explore the complex immunomodulatory mechanisms of helminths beyond the Th1/Th2 paradigm.
- To suggest strategies for developing helminth-derived therapies for human Th1-mediated autoimmune pathologies.
Main Methods:
- Review of existing literature on helminth infections and autoimmune disease models in animals.
- Analysis of studies investigating the effects of helminth antigens on immune responses.
- Exploration of the genetic diversity of helminths (approx. 20,000 genes) for potential therapeutic products.
Main Results:
- Helminth infection and products have demonstrated success in preventing various Th1-mediated autoimmune diseases in animal models.
- Helminths induce strong Th2 polarization without typically causing allergies in the host, indicating complex immune regulation.
- Helminth infections impact host immunity at multiple levels, making the identification of specific therapeutic molecules challenging.
Conclusions:
- Helminth-derived products hold potential for treating human Th1-mediated autoimmune diseases.
- Further research is needed to identify specific helminth molecules and understand their mechanisms of action.
- Developing targeted therapies based on helminth immunomodulation requires careful consideration of their complex interactions with the host immune system.