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Early stage-specific immune responses in primary experimental human hookworm infection
Stefan M Geiger1, Ricardo T Fujiwara, Helton Santiago
1Fundação Oswaldo Cruz, Centro de Pesquisas René Rachou, Avenida Augusto de Lima 1715, CEP: 30190-002, Belo Horizonte-MG, Brazil. stefan@cpqrr.fiocruz.br
Microbes and Infection
|October 14, 2008
Summary
Cellular immune responses to hookworm (Necator americanus) infection involve dynamic changes in T-cell proliferation and cytokine production, offering potential biomarkers for infection staging.
Area of Science:
- Immunology
- Parasitology
- Infectious Diseases
Background:
- Hookworm infections affect millions globally, causing significant morbidity.
- Understanding the host immune response is crucial for developing effective interventions.
- Necator americanus is a primary cause of human hookworm disease.
Purpose of the Study:
- To characterize the cellular immune response during different stages of human hookworm infection.
- To identify potential immune markers for staging hookworm infection.
- To investigate immune responses following treatment and potential reinfection.
Main Methods:
- Two human volunteers were infected with Necator americanus.
- Immune responses were assessed against stage-specific antigens (larval and adult worm extracts).
- Cellular proliferation, TNF-alpha, CCL17, and IL-10 levels were measured in peripheral blood mononuclear cells (PBMCs).
Main Results:
- Peripheral blood eosinophilia correlated with juvenile worm arrival.
- Cellular reactivity initially increased then decreased during pre-patency, rising again during patency.
- Elevated TNF-alpha and CCL17 were detected during infection, decreasing post-treatment.
- A significant rise in IL-10 was observed during late pre-patency.
Conclusions:
- Cellular immune responses to Necator americanus infection are dynamic and stage-specific.
- Cytokine and chemokine profiles may serve as biomarkers for classifying infection status, particularly in egg-negative individuals.
- Further research in endemic areas could validate these markers for improved patient classification.
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