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Tick saliva reprograms macrophages into immunosuppressive hubs that regulate T-cell immunity in Rhipicephalus
Hayato Nakamura1, Tomohiro Okagawa1,2, Naoya Maekawa1
1Department of Disease Control, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
Communications Biology
|April 30, 2026
Summary
Cattle tick saliva suppresses host immunity by reprogramming macrophages. These immune cells then inhibit T-cell responses, facilitating pathogen transmission and disease.
Area of Science:
- Immunology
- Parasitology
- Molecular Biology
Background:
- Ticks transmit pathogens via saliva with immunomodulatory effects.
- Cellular mechanisms of tick saliva-induced immune suppression are not well understood.
Purpose of the Study:
- Identify the cellular players and mechanisms behind tick saliva-mediated immune suppression.
- Investigate how Rhipicephalus microplus saliva impacts T-cell immunity.
Main Methods:
- Co-culture assays with tick saliva, T cells, and CD14+ cells (macrophages).
- Flow cytometry to analyze cytokine production (IFN-γ, TNF, IL-10, TGF-β).
- Transcriptomic and functional analyses of reprogrammed macrophages.
- Immunofluorescence of tick-feeding sites.
Main Results:
- Tick saliva inhibited T-cell production of IFN-γ and TNF.
- Saliva enhanced IL-10 and TGF-β in regulatory T cells.
- Macrophage depletion abolished saliva-induced immunosuppression.
- Tick saliva reprogrammed macrophages to an immunosuppressive phenotype (reduced MHC II, attenuated inflammation, suppressed chemokines).
- Tick-feeding sites showed increased IL-10+ macrophages and T cells.
Conclusions:
- Macrophages are central to tick saliva-induced immunosuppression.
- Tick saliva reprograms macrophages to suppress T-cell immunity.
- This immune evasion strategy aids pathogen transmission by arthropod vectors.
