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Updated: Aug 12, 2026
Isolation of Mouse Lung Dendritic Cells
Published on: November 22, 2011
A subset of cytolytic dendritic cells in rat
B Trinité1, C Voisine, H Yagita
1Institut National de la Santé et de la Recherche Médicale Unité 437 and Institut de Transplantation et de Recherche en Transplantation, Nantes, France.
Insights
Freshly isolated rat splenic dendritic cells (DCs) show cytotoxic activity against specific target cells. This natural cytotoxicity is mediated by a CD4-negative subset of DCs through a calcium-independent mechanism.
Area of Science:
- Immunology
- Cell Biology
Background:
- Dendritic cells (DCs) are crucial leukocytes for antigen processing and T cell presentation.
- Previous studies demonstrated cytotoxic activity in cultured rat splenic DCs.
Purpose of the Study:
- To investigate the cytotoxic function of freshly prepared dendritic cells from rat lymphoid organs.
- To characterize the subset of dendritic cells responsible for cytotoxicity and the underlying mechanism.
Main Methods:
- Isolation of dendritic cells from rat spleen, lymph nodes, and thymus using the DC-specific OX62 mAb and magnetic beads.
- Flow cytometry (FACS) analysis to identify DC subsets based on CD4, OX41, CD5, CD90, and class II expression.
- Assessment of cytotoxic activity against YAC-1 and K562 target cells.
Main Results:
- Fresh splenic DCs, but not lymph node or thymic DCs, exhibited significant cytotoxic activity.
- Cytotoxicity was primarily associated with a CD4-negative splenic DC subset (80-85%).
- Fresh splenic DC cytotoxicity against YAC-1 cells was calcium-independent and not mediated by Fas ligand, TRAIL, or TNF-alpha.
Conclusions:
- Rat spleen contains a naturally cytolytic CD4-negative dendritic cell subset.
- This subset plays a role in both innate and adaptive immunity.
- Rat dendritic cells employ distinct cytotoxic mechanisms based on their maturation or activation state.
Abstract:
Dendritic cells (DCs) are a rare population of leukocytes specialized in Ag processing and presentation to T cells. We have previously shown that cultured rat splenic DCs exhibit a cytotoxic activity against selected target cells. In this study, we analyzed this function in DCs freshly prepared from lymphoid organs using the DC-specific OX62 mAb and magnetic beads. Freshly extracted splenic DCs, but not lymph node and thymic DCs, exhibited a strong and moderate cytotoxic activity against YAC-1 and K562 target cells, respectively. FACS analyses showed that spleen contained a minor subset (10-15%) of CD4(+) and class II(int) DCs that also expressed the OX41 Ag and the lymphoid-related Ags CD5 and CD90 (Thy-1) and a major (80-85%) subset of CD4(-)/OX41(-)/CD5(-) and class II(int) DCs. The cytotoxic activity of splenic DCs was strictly restricted to the CD4(-) DCs, a subset poorly represented in LN and thymus. Contrasting with our previous report using cultured splenic DCs, freshly isolated splenic DCs killed YAC-1 cells using a Ca(2+)-independent mechanism, but this function did not appear mediated by Fas ligand, TNF-related apoptosis-inducing ligand, or TNF-alpha. Therefore, rat DCs contain a subset of naturally cytolytic cells that could play a role in both innate and acquired immune responses. Together with our previous report, these data suggest that rat DCs can use two mechanisms of cytotoxicity depending on their maturation/activation state.
