机构地区:[1]中国医学科学院、北京协和医学院血液学研究所、血液病医院,天津300020
出 处:《中华血液学杂志》2013年第3期213-216,共4页Chinese Journal of Hematology
基 金:天津市自然科学基金(10JCYBJC11200);国家863计划(2011AA020114)
摘 要:目的探讨干扰素-γ(IFN-γ)对正常人骨髓间充质干细胞(MSC)免疫活性的影响,阐明IFN-1与MSC在免疫抑制中的协同作用。方法①ELISA法检测IFN-γ(终浓度100ng/ml)对正常人骨髓来源MSC前列腺素E2(PGE2)、肝细胞生长因子(HGF)和转化生长因子β1(TGF-β1)表达水平的影响。②RT—PCR法检测100ng/mlIFN-γ作用下MSC内吲哚胺2,3-双加氧酶(IDO)基因表达水平变化。③体外刺激正常人外周血T细胞增殖,并与正常人骨髓来源MSC共培养,检测T细胞增殖水平;在共培养体系中分别加入重组人IFN-γ(100ng/m1)及鼠抗人IFN-γ单克隆抗体(单抗,5tLg/m1),检测T细胞增殖水平变化。结果①MSC单独培养24~48h可检测到PGE2、HGF、TGF-β1三种细胞因子表达;IFN-γ可促进MSC上述细胞因子的表达[实验组及对照组PGE2、HGF、TGF-β1表达水平分别为(1715.5±628.6)pg/ml对(1344.5±709.4)pg/ml;(4031.8±1496.8)pg/ml对(2452.4±1375.3)pg/ml;(1753.5±413.8)pg/ml对(1026.6±450.5)Pg/ml,P值分别为0.001、0.011及〈0.001]。②MSC单独培养48h后,RT—PCR法未检测到IDO基因表达。与IFN-γ共培养后,IDO基因呈高水平表达。③在体外MSC可以显著抑制T细胞增殖,外源性IFN-γ不影响MSC对T细胞增殖的抑制作用[T细胞增殖抑制率分别为(40.4±10.9)%和(36.7±7.4)%,P=0.272];在反应体系中加入抗IFN-γ单抗后,MSC抑制T细胞增殖作用显著减弱[T细胞增殖抑制率分别为(40.4±10.9)%和(23.9±7.6)%,P=0.002]。结论MSC组成性表达PGE2、HGF及TGF-β1等免疫抑制性细胞因子,在一定水平IFN-γ作用下,MSC分泌上述3种细胞因子水平明显上调,IDOmRNA表达水平显著增高,MSC免疫活性增强。骨髓MSC在体外可以显著抑制T淋巴细胞增殖,IFN-γ与MSC在免疫抑制中具有协同效应。Objective To investigate mesenchymal stem cells (MSCs) immunosuppressive activity in the presence of interferon-gamma (IFN-γ) to reveal synergistic immunomodulatory effects of IFN-γ, and MSCs. Methods (1) MSCs were cultured in the presence or absence of IFN-γ( 100 ng/ml), the supemarants were collected for measurements of PGE2,HGF and TGF-β1 by ELISA kits. (2) MSCs were cultured in the presence or absence of IFN-γ ( 100 ng/ml)for 48 h. The eDNA was analysed for the expression of human indoleamine 2, 3-dioxygenase (IDO)mRNA by semiquantitative RT-PCR. (3( Mononuclear cells (MNCs) were extracted from peripheral blood of healthy donors. The T cell proliferation was tested in the co-culture system added with MSCs, recombinant human IFN-7 (100 ng/ml) and anti-IFN-γ mAb (5 μg/ml) by Brdg ELISA kit. Results (1)The immunosuppressive cytokines PGE2,HGF and TGF-β1 were detectable within 24 - 48 h in the supematants. Their expressions were significantly up-regulated in the presence of IFN-7. Concentrations of these cytokines were as of ( 1715.5 ± 628.6) pg/ml vs ( 1344. 5 ± 709.4) pg/ml ( P = 0.001 ) ; (4031.8 ± 1496.8) pg/ml vs (2452.4 ± 1375.3) pg/ml(P =0.011 ) ; ( 1753.5±413.8) pg/ml vs ( 1026.6 ±450.5 ) pg/ml ( P 〈 0. 001 ), respectively. (2)The expression of IDO mRNA was undeteetable when MSCs were cultured alone. In contrast, The IDO mRNA expression was remarkably enhanced in the presence of IFN-γ. (3)Bone marrow-derived MSCs remarkably suppressed allogeneic T cell proliferation in vitro. Addition of exogenous IFN-γ had no significant effect on the inhibitory capacity of MSCs, the inhibitory ratios of T cell proliferation were (40.4 ± 10.9 ) % vs ( 36.7± 7.4) % ( P =0. 272). By contrast, the inhibi- tory ratio of T cell proliferation was significantly decreased in the presence of anti-IFN-γ mAb [ (40.4 ± 10.9)% vs(23.9 ±7.6)%, P=0.002]. Conclusions (2) Human MSCs constitutively exp
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