当归多糖对再生障碍性贫血小鼠骨髓Th17/Treg细胞平衡及相关炎性因子蛋白表达的影响

Effect of Angelica polysaccharides on Th17/T-regulatory cell balance and expression of related inflammatory factor proteins in bone marrow of mice with aplastic anemia

目的探究当归多糖(Angelica polysaccharide,APS)对再生障碍性贫血(aplastic anemia,AA)小鼠骨髓Th17/Treg细胞平衡及相关炎性因子蛋白表达的影响。方法50只雄性BALB/c小鼠随机分为正常组、模型组、环孢素A组、APS低、高剂量组,利用射线照射联合异源淋巴细胞输注的方法制备再生障碍性贫血小鼠模型。建模后灌胃给药28 d,观察小鼠一般情况、体重变化、脾指数,检测外周血基本血液学参数变化,HE染色评价小鼠骨髓组织病理变化;ELSIA法检测骨髓TGF-β1、IL-10、IL-17A、IL-6等蛋白表达水平;FCM检测骨髓Th17、Treg细胞比例及Th17/Treg细胞平衡变化。结果与正常组相比,模型组小鼠活动笨拙,精神萎靡,眼睑唇色耳廓颜色苍白,进食饮水量减少;体重及脾指数均明显下降;外周血红细胞、白细胞、血小板计数及血红蛋白浓度均明显降低;骨髓组织结构紊乱,造血组织增生度明显减低;IL-17A、IL-6蛋白表达明显上调,TGF-β1、IL-10蛋白表达明显下调;骨髓Th17细胞比例明显增高,Treg细胞比例明显降低,Th17/Treg细胞比值显著升高(P<0.01)。与模型组相比,APS低、高剂量组一般状况均改善,进食量及饮水量增加,体重、脾指数明显升高,外周血红细胞、白细胞、血小板计数及血红蛋白浓度明显升高(P<0.05),骨髓组织结构改善,造血组织增生度升高(P<0.05);IL-17A、IL-6蛋白表达明显下调,TGF-β1、IL-10蛋白表达明显上调(P<0.05或P<0.01);骨髓Th17细胞比例明显降低,Treg细胞比例明显升高,Th17/Treg细胞比值显著下降(P<0.01)。结论当归多糖能改善AA小鼠骨髓造血功能,其机制可能是通过调节Th17/Treg细胞平衡来实现。

Objective To investigate the effect of Angelica polysaccharides on the balance of Th17/T-regulatory(Treg)cells and the expression of related inflammatory factor proteins in the bone marrow of mice with aplastic anemia.Methods 50 male BALB/c mice were randomly divided into a normal group,model group,cyclosporine A(CsA)group,and angelica polysaccharide low-(APS-L)and high-dose(APS-H)groups.A mouse model of aplastic anemia was prepared by combining irradiation with allogeneic lymphocyte infusion.After modeling,the mice were orally administered with corresponding drugs for 28 days.The general condition,weight changes,and spleen index of the mice were observed.Blood samples were taken to test for changes in basic hematological parameters of peripheral blood,and hematoxylin and eosin staining was used to evaluate the pathological changes in mouse bone marrow tissue.An ELISA method was applied to detect bone marrow TGF-β1.The expression levels of proteins such as IL-10,IL-17A,and IL-6 were analyzed,and flow cytometry was used in detecting the bone marrow Th17/Treg cell ratio.Results Compared with the normal group,the model group mice showed clumsiness during activity;lethargy;pale eyelids,lips,and ears;and reduced food and water intake.Both body weight and spleen index were significantly decreased.Peripheral red blood cell,white blood cell,and platelet counts and hemoglobin concentration were significantly reduced.A disordered bone marrow tissue structure and significantly reduced proliferation of hematopoietic tissue were seen.The expression of IL-17A and IL-6 proteins was significantly upregulated,and the expression of TGF-β1 and IL-10 protein was significantly downregulated.The proportion of Th17 cells in bone marrow significantly increased,the proportion of Treg cells significantly decreased,and the ratio of Th17/Treg cells significantly increased(P<0.01).Compared with the model group,the general condition of the APS-L and APS-H groups improved,showing an increase in food and water intake;a significant increase in body weight and spleen index;a significant increase in peripheral red blood cells,white blood cells,platelets,and hemoglobin concentration(P<0.05);an improvement in bone marrow tissue structure;and an increase in hematopoietic tissue proliferation(P<0.05).The expression of IL-17A and IL-6 proteins was significantly downregulated.The expression of TGF-β1 and IL-10 protein was significantly upregulated(P<0.05 or P<0.01).The proportion of Th17 cells in bone marrow significantly decreased,the proportion of Treg cells significantly increased,and the ratio of Th17/Treg cells significantly decreased(P<0.01).Conclusions Angelica polysaccharides can improve bone marrow hematopoietic function in aplastic anemia mice,and its mechanism of action may include the regulation of Th17/Treg cell balance.