1.贵州中医药大学,贵阳 550025
2.贵州中医药大学 第二附属医院,贵阳 550001
3.德江县民族中医院,铜仁 565200
李倩,在读博士,从事中西医结合证候物质基础研究,E-mail:1037541016@qq.com
陈云志,博士,教授,从事中西医结合证候物质基础研究,E-mail:chenyunzhi270@gzy.edu.cn
收稿:2024-08-19,
录用:2024-10-29,
网络出版:2024-11-07,
纸质出版:2025-03-05
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李倩,陈雨佳,周艳等.基于维生素D调控树突状细胞表型探讨淫羊藿苷对心肌重塑大鼠心脏的影响[J].中国实验方剂学杂志,2025,31(05):76-85.
LI Qian,CHEN Yujia,ZHOU Yan,et al.Effect of Icariin on Myocardial Remodeling in Rats Based on Vitamin D Regulation of Dendritic Cell Phenotype[J].Chinese Journal of Experimental Traditional Medical Formulae,2025,31(05):76-85.
李倩,陈雨佳,周艳等.基于维生素D调控树突状细胞表型探讨淫羊藿苷对心肌重塑大鼠心脏的影响[J].中国实验方剂学杂志,2025,31(05):76-85. DOI: 10.13422/j.cnki.syfjx.20241841.
LI Qian,CHEN Yujia,ZHOU Yan,et al.Effect of Icariin on Myocardial Remodeling in Rats Based on Vitamin D Regulation of Dendritic Cell Phenotype[J].Chinese Journal of Experimental Traditional Medical Formulae,2025,31(05):76-85. DOI: 10.13422/j.cnki.syfjx.20241841.
目的
2
探讨淫羊藿苷(ICA)对Dahl盐敏感大鼠心肌重塑模型心脏组织树突状细胞(DCs)表型的影响及对维生素D系统的调控。
方法
2
将雄性Dahl盐抵抗大鼠分为正常组,雄性Dahl盐敏感大鼠分为模型组,淫羊藿苷低、中、高剂量组(30、60、120 mg·kg
-1
·d
-1
),维生素D组(3×10
-5
mg·kg
-1
·d
-1
);除正常组外,其余各组均给予8%高盐饲料喂养建立心肌重塑模型,并于造模成功后进行灌胃给药,1次/d,连续6周。进行尾动脉血压动态变化监测;大鼠心脏超声功能检测;苏木素-伊红(HE)染色和马松(Masson)染色观察大鼠心脏组织形态变化;流式细胞术检测心脏树突状细胞表型成熟和辅助性T细胞17(Th17)/调节性T细胞(Treg)值;实时荧光定量聚合酶链式反应(Real-time PCR)和蛋白免疫印迹法(Western blot)检测心脏组织中维生素D受体(VDR)、1
α
-羟化酶(CYP27B1)、24-羟化酶(CYP24A1)、叉头框蛋白P3(FoxP3)、孤核受体
γ
t(ROR
γ
t)、心肌Ⅰ型胶原(ColⅠ)和Ⅲ型胶原(ColⅢ)mRNA和蛋白表达。
结果
2
与正常组比较,模型组心肌细胞排列紊乱并出现断裂,细胞核固缩,心肌组织明显水肿,胶原纤维明显增生呈网状分布,尾动脉血压、左室舒张末期内径(LVEDD)、左室收缩末期内径(LVESD)明显上升(
P
<
0.05),心脏DCs表型CD40、CD80、CD86、主要组织相容性复合体-Ⅱ(MHC-Ⅱ)和Th17细胞、Th17/Treg明显上升(
P
<
0.05),心脏CYP24A1、ROR
γ
t mRNA和蛋白表达及ColⅠ、ColⅢ mRNA表达均明显上升(
P
<
0.05),心脏左室射血分数(LVEF)、室间隔厚度(IVSD)、左室后壁厚度(LVPWD)明显下降(
P
<
0.05),心脏DCs表型CD11、CD11b、Treg细胞明显减少(
P
<
0.05),心脏VDR、CYP27B1、FoxP3 mRNA和蛋白表达均明显下降(
P
<
0.05)。与模型组比较,淫羊藿苷低、中、高剂量组和维生素D组大鼠心肌细胞断裂和核固缩情况明显减轻,淫羊藿苷高剂量组和维生素D组心肌细胞少部分出现断裂、核固缩的现象,不同程度改善心肌纤维排列,心肌纤维断裂和增生明显减少,淫羊藿苷低、中、高剂量组和维生素D组尾动脉血压、LVEDD、LVESD明显下降(
P
<
0.05),心脏DCs表型CD40、CD80、CD86、MHC-Ⅱ和Th17细胞、Th17/Treg明显下降(
P
<
0.05),淫羊藿苷中、高剂量组和维生素D组心脏CYP24A1、ROR
γ
t mRNA和蛋白表达及ColⅠ、ColⅢ mRNA表达明显下降(
P
<
0.05),淫羊藿苷低、中、高剂量组和维生素D组心肌重塑模型大鼠LVEF、IVSD、LVPWD明显上升(
P
<
0.05);淫羊藿苷中、高剂量组和维生素D组心脏DCs表型CD11、CD11b、Treg细胞明显增加(
P
<
0.05);淫羊藿苷中、高剂量组和维生素D组心脏VDR、CYP27B1、FoxP3 mRNA和蛋白表达明显上升(
P
<
0.05)。
结论
2
淫羊藿苷可调节Dahl盐敏感大鼠心肌重塑模型尾动脉血压、心脏结构和功能损伤、心肌组织纤维化,还可抑制心脏组织DCs表型和功能成熟,影响VDR、CYP24A1、CYP27B1 mRNA和蛋白表达,实现其对心肌重塑免疫过程中Th17/Treg平衡的干预,可能是通过调节心脏组织中维生素D/VDR发挥作用。
Objective
2
To investigate the effect of icariin (ICA) on the phenotype of dendritic cells (DCs) in heart tissue of the Dahl salt-sensitive myocardial remodeling model of rats and its regulation on the vitamin D system.
Methods
2
Male Dahl salt-resistant rats were divided into a normal group, and male Dahl salt-sensitive rats were divided into a model group, low-, medium-, and high-dose ICA groups (30, 60, 120 mg·kg
-1
·d
-1
), and Vitamin D group (3×10
-5
mg·kg
-1
·d
-1
). In addition to the normal group, the other groups were given an 8% high salt diet to establish a myocardial remodeling model and received intragastric administration after successful modelling once a day for six weeks. The dynamic changes in tail artery blood pressure were monitored, and detection of cardiac ultrasound function in rats was performed. Hematoxylin-eosin (HE) staining and Masson staining were used to observe the morphological changes in rat heart tissue. The phenotype of DCs and T helper cell 17 (Th17)/regulatory T cell (Treg) ratio were detected by flow cytometry. The mRNA and protein expression of vitamin D receptor (VDR), 1
α
-hydroxylase (CYP27B1), 24-hydroxylase (CYP24A1), forkhead frame protein 3 (FoxP3), solitaire receptor
γ
t (ROR
γ
t), myocardial type Ⅰ collagen (ColⅠ), and type collagen (ColⅢ) in heart tissue was detected by real-time fluorescence quantitative polymerase chain reaction (Real-time PCR) and Western blot.
Results
2
Compared with the normal group, the model group showed disordered arrangement and rupture of myocardial cells, nuclear condensation, significant edema of myocardial tissue, significant
proliferation of collagen fibers in a network distribution, and a significant increase in tail artery blood pressure, left ventricular end diastolic diameter (LVEDD), and left ventricular end systolic diameter (LVESD) (
P
<
0.05). The phenotype of cardiac DCs was CD40, CD80, and CD86, and the levels of major histocompatibility complex Ⅱ (MHC-Ⅱ), Th17 cells, and Th17/Treg were significantly increased (
P
<
0.05). The mRNA and protein expression of CYP24A1 and ROR
γ
t in the heart, as well as the mRNA expression of ColⅠ and ColⅢ, were significantly increased (
P
<
0.05). The left ventricular ejection fraction (LVEF), interventricular septal thickness (IVSD), and left ventricular posterior wall thickness (LVPWD) were significantly decreased (
P
<
0.05). The phenotype of cardiac DCs such as CD11, CD11b, and Treg cells, were significantly reduced (
P
<
0.05), while the mRNA and protein expression of cardiac VDR, CYP27B1, and FoxP3 were significantly decreased (
P
<
0.05). Compared with the model group, the low-, medium-, and high-dose ICA groups and vitamin D group significantly reduced myocardial cell rupture and nuclear consolidation in rats. The high-dose ICA group and vitamin D group showed a small amount of myocardial cell rupture and nuclear consolidation, improving myocardial fiber arrangement to varying degrees and significantly reducing myocardial fiber rupture and proliferation. The tail artery blood pressure, LVEDD, and LVESD were significantly decreased in the low-, medium-, and high-dose ICA groups and vitamin D group (
P
<
0.05), and the phenotype of cardiac DCs including CD40, CD80, CD86, MHC-Ⅱ, Th17 cells, and Th17/Treg were significantly decreased (
P
<
0.05). The mRNA and protein expression of CYP24A1 and ROR
γ
t, and the mRNA expression of ColⅠ and ColⅢ in the heart were significantly decreased in the medium- and high-dose ICA groups a
nd vitamin D group (
P
<
0.05). The LVEF, IVSD, and LVPWD of myocardial remodeling model rats in the low-, medium-, and high-dose ICA groups and vitamin D group were significantly increased (
P
<
0.05). The phenotypes of cardiac DCs including CD11, CD11b, and Treg cells were significantly increased in the medium- and high-dose ICA groups and the Vitamin D group (
P
<
0.05). The mRNA and protein expressions of VDR, CYP27B1, and FoxP3 in the heart were significantly increased in the medium- and high-dose ICA groups and vitamin D group (
P
<
0.05).
Conclusion
2
ICA can regulate tail artery blood pressure, cardiac structural and functional damage, and myocardial tissue fibrosis and inhibit phenotype and functional maturation of DCs in heart tissue in the myocardial remodeling model of Dahl salt-sensitive rats. It can also affect the gene and protein expression of VDR, CYP24A1, and CYP27B1, achieving its intervention in Th17/Treg balance in the immune process of myocardial remodeling possibly by regulating vitamin D/VDR in heart tissue.
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