Cited by 78Parasitic Diseases Research and TreatmentParasites and Host InteractionsHelminth infection and control

Proinflammatory cytokines dominate the early immune response to filarial parasites

Babu, Subash, Nutman, Thomas B·2003·The Journal of Immunology

Abstract

Although the early human immune response to the infective-stage larvae (L3) of Brugia malayi has not been well-characterized in vivo (because of the inability to determine the precise time of infection), the consensus has been that it must involve a predominant Th2 environment. We have set up an in vitro system to study this early immune response by culturing PBMC from unexposed individuals with live L3 of B. malayi. After 24 h of culture, T cell responses were examined by flow cytometry and by quantitative real-time RT-PCR for multiple cytokines. T cells were activated early following exposure to L3 as indicated by up-regulation of surface markers CD69 and CD71. The frequency of T cells expressing proinflammatory Th1 cytokines (IFN-gamma, TNF-alpha, GM-CSF, IL-1alpha, and IL-8) but not Th2 cytokines (IL-4, IL-5, IL-6, IL-10, and IL-13) was significantly increased in response to L3. This T cell response occurred in both the CD4 and CD8 T cell compartment and was restricted to the effector/memory pool (CD45RO(+)). This T cell response was not due to LPS activity from the parasite or from its endosymbiont, Wolbachia; moreover, it required the presence of APC as well as direct contact with live L3. Real-time RT-PCR analysis of multiple cytokines in the T cells confirmed the increased expression of proinflammatory Th1 cytokines. Up-regulation of these cytokines suggests that the primary immune response to the live infective stage of the parasite is not predominantly Th2 in nature but rather dominated by a proinflammatory response.

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Crossref · 10.4049/jimmunol.171.12.6723

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Authors
Babu, S., & Nutman, T. B.
Affiliations
National Institutes of Health (US)
Venue
The Journal of Immunology
Published
2003-12
Volume
171
Issue
12
Pages
6723-6732
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W2166067725
Cited by
78
References
39
Citations by year
2025: 3 · 2022: 4 · 2021: 4 · 2020: 1 · 2019: 6 · 2018: 4 · 2017: 4 · 2016: 3 · 2015: 2 · 2014: 5 · 2013: 5 · 2012: 4
FWCI
3.11
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Parasitic Diseases Research and Treatment
  • Life Sciences › Immunology and Microbiology › Parasitology › Parasites and Host Interactions
  • Health Sciences › Veterinary › Small Animals › Helminth infection and control
Keywords
Brugia malayi, filariasis, infective larvae, Th1 response, inflammatory cytokines, Th2 immune response, T cell activation, CD69, transferrin receptor, CD45RO+ memory T cells, CD4 and CD8 T cells, antigen-presenting cells, Wolbachia, interferon-gamma, TNF-α, GM-CSF, IL-1α, interleukin-8
MeSH terms
Animals, Antigen-Presenting Cells, Antigens, Helminth, Cell Communication, Cells, Cultured, Flow Cytometry, Host-Parasite Interactions, Humans, Lipopolysaccharides, Lymphocyte Activation, T-Lymphocytes, CD4-Positive T-Lymphocytes, Cytokines, Brugia malayi, CD8-Positive T-Lymphocytes, Th1 Cells, Inflammation Mediators, Reverse Transcriptase Polymerase Chain Reaction

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