人外周血NKT细胞体外扩增及其分泌细胞因子的研究

Study on the expansion and the cytokine releasing of human NKT cells in vitro

目的 建立人外周血自然杀伤T细胞 (NKT)体外扩增及检测NKT细胞所分泌的细胞因子的方法。方法 分别采用单加α 半乳糖神经酰胺 (α Galcer组 ) ,单加树突状细胞 (DC组 )以及同时加α Galcer、DC(α Galcer、DC组 )的方法从人外周血单个核细胞 (PBMC)和纯化T淋巴细胞中扩增TCRVα2 4+ /TCRVβ1 1 + NKT细胞。采用细胞内细胞因子流式细胞术检测手段测定NKT细胞中IL 4 ,IFN γ、TNF α阳性细胞比例。结果 PBMC中的α Galcer组 ,DC、α Galcer组和纯化T淋巴细胞中的DC、α Galcer组 ,NKT细胞扩增 1 9d后分别占淋巴细胞的 (2 5 .5± 7.2 ) %、(1 8.2± 8.2 ) %和 (2 4 .8± 5 .5 ) % ,NKT细胞分别扩增了 (1 5 .1± 9.1 )× 1 0 3 倍、(2 1 .8± 1 7.3)× 1 0 3 倍和 (2 3.0± 1 6 .7)× 1 0 3 倍 ,与其它各组差异有显著性意义 (P <0 .0 1 )。扩增过程TCRVβ1 1+ NKT细胞中分泌IL 4 ,IFN γ和TNF α的细胞比例均高于TCRVβ1 1 T淋巴细胞 (P <0 .0 5 )。结论 α Galcer具有体外大量扩增NKT细胞的能力 ,同时α Galcer的激活能力受CD1d分子的限制。由于PBMC中的单核系细胞也表达CD1d分子 。

Objective To expand the NKT cells in vitro and to determine the cytokine releasing of NKT cells during proliferation.Methods Several kind of methods were established to expand TCRV α24 +/TCRV β11 + NKT cells from PBMC or purified T lymphocyte.The levels of IL 4,IFN γand TNF α of NKT cells were determined by flow cytometry.Results After 19 days' expansion,the largest number of NKT cells increased (23.0±16.7)×10 3 times and the largest ratio of NKT cells to total T lymphocyte was (25.5±7.2)%.The ratio of TCRV β11 + NKT cells that secreted IL 4,IFN γand TNF α was higher than the TCRVβ11 T lymphocytes.Conclusion TCRV α24 +/TCRV β11 + NKT cells can be expanded in vitro with α Galcer presented by CD 1d molecule.The NKT cells can also be expanded from PBMC because the monocyte lineage cells within PBMC can express CD 1d molecule and present specific glycolipids like α Galcer to them.