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Published on: August 1, 2013
Triptolide affects the differentiation, maturation and function of human dendritic cells.
Ke-Jian Zhu1, Qian-Yun Shen, Hao Cheng
1Department of Dermatology and Venereology, Sir Run Run Shaw Hospital, Medical College, Zhejiang University, Hangzhou 310016, PR China. zhukejian@mail.hz.zj.cn
International Immunopharmacology
|June 15, 2005
Summary
Triptolide, derived from a Chinese herb, suppresses dendritic cell (DC) differentiation and maturation, potentially explaining its immunosuppressive effects. It also induces DC apoptosis but enhances their phagocytic capacity.
Area of Science:
- Immunology
- Pharmacology
- Cell Biology
Background:
- Triptolide, a component of Tripterygium wilfordii, exhibits anti-inflammatory and immunosuppressive properties via T cell inhibition.
- The impact of triptolide on dendritic cells (DCs), crucial for initiating immune responses, remains largely unknown.
- Dexamethasone (Dex), a known immunosuppressant, modulates DC development and influences immune response initiation.
Purpose of the Study:
- To investigate the effects of triptolide on the differentiation, maturation, and function of human monocyte-derived dendritic cells (MoDC) in vitro.
- To compare the effects of triptolide with dexamethasone (Dex) on MoDC development and function.
- To elucidate the role of DCs as potential targets for triptolide's immunosuppressive activity.
Main Methods:
- MoDC were differentiated in vitro using GM-CSF and IL-4.
- Triptolide and Dex were applied to MoDC to assess their impact on differentiation and maturation markers (e.g., CD1a, CD40, CD80, CD86, HLA-DR, CD83).
- Lymphocyte proliferation in allogeneic mixed lymphocyte reactions, apoptosis (APO2*7, TUNEL assay), and phagocytic capacity were evaluated.
Main Results:
- Both triptolide and Dex inhibited MoDC differentiation and maturation, evidenced by altered expression of key surface markers and reduced lymphocyte stimulation.
- Higher concentrations of triptolide and Dex induced apoptosis in MoDC.
- Triptolide, unlike Dex, enhanced the phagocytic capacity of MoDC.
Conclusions:
- Triptolide suppresses DC differentiation and maturation, contributing to its overall immunosuppressive effects.
- DCs are identified as a primary target for triptolide's immunosuppressive activity.
- Triptolide's dual action on DCs—inhibiting differentiation/maturation while enhancing phagocytosis—warrants further investigation.
