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In vitro functional tests for evaluation of stimulating capacity of cultured human dendritic cells
Tine Hajdinjak1, Matjaž Jeras1, Miomir Knežević1
1Tissue Typing Centre, Blood Transfusion Centre of Slovenia, Šlajmerjeva 6, 1000 Ljubljana, SI Fax:+386-61-1312304, Ljubljana, Slovenia.
Insights
This study shows mature dendritic cells (DCs) significantly enhance mixed lymphocyte reactions (MLRs) within 48 hours. This accelerates the evaluation of DC function compared to traditional methods using macrophages.
Area of Science:
- Immunology
- Cell Biology
- Biotechnology
Background:
- The allogeneic one-way mixed lymphocyte reaction (MLR) is a standard functional test for in vitro cultured human dendritic cells (DCs).
- Evaluating the stimulating capacity of DCs is crucial for assessing their function.
- Conventional MLR assays typically measure cell proliferation via 3H-thymidine incorporation at days 5-7.
Purpose of the Study:
- To investigate the kinetics of proliferative responses initiated by different stimulator cell types in MLR.
- To determine if the time required for the MLR functional test can be reduced.
- To compare the efficacy of mature dendritic cells versus macrophages as stimulators in MLR.
Main Methods:
- Comparison of mixed lymphocyte reaction (MLR) kinetics using human dendritic cells (DCs) and macrophages as stimulators.
- Measurement of cell proliferation by 3H-thymidine incorporation.
- Kinetic analysis of proliferative responses from day 1 to day 7.
Main Results:
- Macrophage-stimulated MLRs showed a gradual increase in response from day 1-7, with significant differences from controls noted from day 4.
- Mature dendritic cell-stimulated MLRs exhibited consistently higher proliferation from day 2 compared to controls.
- The response peaked 2-3 days earlier and was over twofold more intense with mature DCs, with maximal response observed within 48 hours.
Conclusions:
- Mature dendritic cells (DCs) provide a significantly faster and more intense proliferative response in MLR compared to macrophages.
- The enhanced MLR response within 48 hours using mature DCs allows for earlier confirmation of their presence and maturity.
- This accelerated assay provides a more efficient method for evaluating the functional capacity of in vitro cultured human dendritic cells.
Abstract:
Basic functional test for evaluation of in vitro cultured human dendritic cells (DC) is primary allogeneic one-way mixed lymphocyte reaction (MLR). In this way, one can evaluate stimulating capacity, which is a basic characteristic of DC. The proliferation of cells is measured through incorporation of 3H-thymidine. Normally proliferation is measured at days 5-7. We studied kinetics of proliferative responses initiated with different stimulating cell suspensions to evaluate differences and possibly reduce time needed to perform this test.Gradual increase in response from days 1 to 7 and a significant difference from controls (peripheral blood mononuclear cells) seen from day 4 was noted if macrophages were used as stimulators. A consistently higher proliferation, compared to controls, was always found already on day 2 when mature DC were used as stimulators. The reaction peaked 2 to 3 days earlier and was also more than two times more intense.This maximal and significantly higher response, consistently seen already after 48 hours, allows us to confirm the presence of mature DC in stimulating suspensions much earlier than previously.
