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Preparation of Tumor Antigen-loaded Mature Dendritic Cells for Immunotherapy
Published on: August 1, 2013
Complement protein C1q induces maturation of human dendritic cells
Eszter Csomor1, Zsuzsa Bajtay, Noémi Sándor
1Department of Immunology, Eötvös Loránd University, Pázmány Péter s. 1/C, Budapest H-1117, Hungary.
Molecular Immunology
|March 27, 2007
Summary
The complement protein C1q triggers dendritic cell maturation, enhancing their ability to activate T cells and promote a Th1 immune response. This suggests C1q-opsonized antigens are key in immune regulation and autoimmunity.
Area of Science:
- Immunology
- Cell Biology
- Complement System
Background:
- Dendritic cell (DC) maturation is induced by various stimuli, including microbial products and cytokines.
- Immune complexes contain C1q, and C1q can bind to apoptotic cells and pathogens independently of antibodies.
- The role of C1q in DC function and maturation is not fully understood.
Purpose of the Study:
- To investigate the impact of C1q on human dendritic cell (DC) functions.
- To determine if C1q can induce DC maturation and influence their cytokine secretion and T-cell activation capabilities.
Main Methods:
- Human monocyte-derived immature DCs (imMDCs) were cultured on immobilized C1q.
- DC maturation was assessed by monitoring surface marker expression (CD80, CD83, CD86, MHCII, CCR7).
- Functional activity was evaluated through cytokine secretion assays and allogeneic T-cell activation assays.
Main Results:
- C1q bound to imMDCs in a dose-dependent manner and induced NF-kappaB translocation.
- Immobilized C1q induced DC maturation, enhancing IL-12 and TNF-alpha secretion and T-cell stimulating capacity.
- C1q-matured DCs promoted a Th1-type response, indicated by increased IFN-gamma, and elevated IL-10 levels.
Conclusions:
- C1q induces human DC maturation and enhances their immune-stimulatory functions.
- C1q-opsonized antigens may play a significant role in initiating and regulating immune responses.
- These findings are relevant to C1q's role in clearing apoptotic cells and its association with autoimmune diseases.
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