【摘要】 目的 观察激素抵抗型(SR)哮喘是否存在嗜酸细胞(EOS)凋亡功能的异常及促炎症细胞因子白细胞介素5(IL-5)和粒-巨噬细胞集落刺激因子(GM-CSF)的调节作用。方法 分离SR(15例)、激素敏感型(SS,30例)两组哮喘患者外周血单个核细胞(PBMCs)及EOS,体外培养后测定:(1)PBMCs在糖皮质激素处理前、后分泌细胞因子的能力;(2)自发的或糖皮质激素诱导的或用PBMCs培养上液处理后的EOS凋亡率及Fas抗原表达率。结果 (1) 糖皮质激素处理前SS组与SR组患者PBMCs分泌IL-5水平(μg/L)分别为196±68、235±98;GM-CSF分泌水平(μg/L)SS组和SR组患者分别为325±110、356±131,两组比较差异均无显著性(P>0.05)。地塞米松处理后与处理前比较,SR组IL-5水平为(210±75)μg/L,差异有显著性(P<0.01);GM-CSF为(312±147)μg/L,差异有显著性(P>0.01);SS组IL-5为(147±62) μg/L,差异有显著性(P<0.01),GM-CSF为(270±97)μg/L,差异有显著性(P<0.05)。(2)SS组与SR组EOS在体外培养时均发生不同程度的凋亡。EOS基础凋亡率SS组为(67±21)%,SR组为(33±17)%,两组与诱导前比较差异有显著性(P<0.001)。Fas抗原表达率SS组为(54±23)%,SR组为(27±15)%,两组比较差异有显著性(P<0.001)。地塞米松诱导后,SS组凋亡率为(89±20)%,与诱导前比较差异有显著性(P<0.01),Fas表达率为(60±17)%,与诱导前比较差异无显著性(P>0.1)。SR组EOS诱导凋亡率和Fas表达率分别为(41±18)%、(35±13)%,与诱导前比较差异无显著性(P均>0.1)。同一患者的PBMCs培养上液可对抗地塞米松诱导EOS凋亡的作用,以SR组更为明显。结论 SR患者的EOS存在自身凋亡功能的缺陷并对激素诱导凋亡作用不敏感,同时Th2细胞分泌促炎症细胞因子的活性不能为激素所抑制,是EOS凋亡不足的另一原因。Effect of eosinophil apoptosis on glucocorticoid-resistant asthma
LIU Chuntao, WANG Zengli, XIE Min, et al.
(Division of Respiratory Medicine, The First Hospital of West China University of Medical Sciences, Chengdu 610041, China)
【Abstract】 Objective To investigate the function of eosinophil apoptosis and regulation of glucocortico steroids on IL-5 and GM-CSF expression in peripheral blood mononuclear cells (PBMCs) in glucocorticoid-resistant asthmatic patients. Methods Eosinophils (EOS) and PBMCs isolated from glucocorticoid-sensitive (SS, 15 cases) and resistant (SR, 30 cases) asthmatic subjects were cultured and treated with dexamethasone (DXM) in vitro. Concentrations of IL-5 and GM-CSF were determined by ELISA in the supernatants recovered in sham and DXM treated cells. The rates of EOS apoptosis and Fas antigen expression were documented via flow cytometer in sham, DXM treated and PBMC supernatant treated groups respectively. Results There were no statistical signi
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