中国组织工程研究 ›› 2024, Vol. 28 ›› Issue (25): 4027-4033.doi: 10.12307/2024.183

• 干细胞基础实验 basic experiments of stem cells • 上一篇    下一篇

骨形态发生蛋白2介导同型半胱氨酸促进血管钙化

裴建升1,杨文娟2,何  静1,燕  茹2,黄  晖2,贾绍斌2   

  1. 1宁夏医科大学临床医学院,宁夏回族自治区银川市   750004;2宁夏医科大学总医院心脏中心,宁夏回族自治区银川市   750004
  • 收稿日期:2023-06-12 接受日期:2023-07-17 出版日期:2024-09-08 发布日期:2023-11-24
  • 通讯作者: 贾绍斌,博士生导师,教授,主任医师,宁夏医科大学总医院心脏中心,宁夏回族自治区银川市 750004 黄晖,在读博士,副教授,主任医师,宁夏医科大学总医院心脏中心,宁夏回族自治区银川市 750004
  • 作者简介:裴建升,男,1997年生,内蒙古自治区阿拉善人,汉族,宁夏医科大学在读硕士,主要从事血管钙化方面的研究。
  • 基金资助:
    国家自然科学基金项目(8206020164),项目负责人:黄晖

Bone morphogenetic protein-2 mediated homocysteine promotes vascular calcification

Pei Jiansheng1, Yang Wenjuan2, He Jing1, Yan Ru2, Huang Hui2, Jia Shaobin2   

  1. 1School of Clinical Medicine, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China; 2Heart Center, General Hospital of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
  • Received:2023-06-12 Accepted:2023-07-17 Online:2024-09-08 Published:2023-11-24
  • Contact: Jia Shaobin, Doctoral supervisor, Professor, Chief physician, Heart Center, General Hospital of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China Huang Hui, Doctoral candidate, Associate professor, Chief physician, Heart Center, General Hospital of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
  • About author:Pei Jiansheng, Master candidate, School of Clinical Medicine, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
  • Supported by:
    National Natural Science Foundation of China, No. 8206020164 (to HH)

摘要:

文题释义:

表型转化:正常情况下,随着机体不断发育,血管平滑肌细胞会从合成型逐渐分化成收缩型,但当机体受到钙化和动脉粥样硬化等外界危险因素刺激时,血管平滑肌细胞又会从收缩型转为合成型,将这个过程称为血管平滑肌细胞的表型转化。
高同型半胱氨酸血症:血浆同型半胱氨酸水平上调会导致一种疾病即高同型半胱氨酸血症,临床上血液中同型半胱氨酸浓度大于15 μmol/L称为高同型半胱氨酸血症。高同型半胱氨酸血症与主动脉、颈动脉和周围血管疾病的发病率增加密切相关,是动脉粥样硬化的独立危险因素。


背景:高同型半胱氨酸血症与血管钙化之间存在一定的内部联系。但是,目前有关高同型半胱氨酸血症促进血管钙化的发病机制还不清楚。

目的:探讨骨形态发生蛋白2在高同型半胱氨酸血症诱导血管钙化中的作用。
方法:人颈动脉蜡块标本根据有无钙化斑块分为钙化组(n=29)与非钙化组(n=13)。16只ApoE-/-小鼠随机分为对照组和高同型半胱氨酸血症组,每组8只。骨形态发生蛋白2转染大鼠胸大动脉平滑肌A7r5细胞,然后应用梯度浓度同型半胱氨酸(50,100,200,400 μmol/L)干预A7r5细胞。茜素红染色和苏木精-伊红染色法检测钙化反应,免疫荧光法检测骨形态发生蛋白2与Runt相关转录因子2相互作用关系,免疫组化法和Western blot检测骨形态发生蛋白2、Runt相关转录因子2、α-平滑肌肌动蛋白的表达。

结果与结论:①人体颈动脉组织染色显示,与非钙化组比较,钙化组炎性细胞增多,钙化阳性率增加(P < 0.05);与非钙化组比较,钙化组骨形态发生蛋白2和Runt相关转录因子2表达量均上调,α-平滑肌肌动蛋白表达量下降(P均 < 0.05);②小鼠动脉标本染色显示,高同型半胱氨酸血症组钙化面积阳性率高于对照组(P < 0.05);高同型半胱氨酸血症组血清同型半胱氨酸水平明显高于对照组(P < 0.05);与对照组比较,高同型半胱氨酸血症组骨形态发生蛋白2和Runt相关转录因子2表达量均上调,α-平滑肌肌动蛋白表达量下降(P均 < 0.05);③A7r5细胞培养分析,随着同型半胱氨酸浓度梯度增加,A7r5细胞钙化程度、骨形态发生蛋白2和Runt相关转录因子2的蛋白表达增加(P < 0.05),α-平滑肌肌动蛋白的蛋白表达降低(P < 0.05);④过表达骨形态发生蛋白2的A7r5细胞培养分析,骨形态发生蛋白2过表达组较相对应的对照组、β-甘油磷酸钠组和同型半胱氨酸组钙化程度增加;Runt相关转录因子2表达上调(P < 0.05),α-平滑肌肌动蛋白表达下调(P < 0.05);⑤同型半胱氨酸钙化培养基培养的骨形态发生蛋白2过表达A7r5细胞中骨形态发生蛋白2表达量增加,且Runt相关转录因子2表达量随骨形态发生蛋白2表达量增加而增加;⑥结果表明,骨形态发生蛋白2是高同型半胱氨酸血症调控平滑肌细胞表型转化导致血管钙化的关键靶基因。靶向调控骨形态发生蛋白2可降低高同型半胱氨酸诱导的血管钙化。

https://orcid.org/0000-0003-0046-6890 (裴建升);https://orcid.org/0000-0002-2517-0028 (贾绍斌);
https://orcid.org/0000-0002-4706-4584 (黄晖)

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

关键词: 血管钙化, 同型半胱氨酸, 骨形态发生蛋白2, Runt相关转录因子2, 平滑肌肌动蛋白

Abstract: BACKGROUND: There is an internal relationship between hyperhomocysteinemia and vascular calcification. However, the pathogenesis of hyperhomocysteinemia promoting vascular calcification is still unclear.   
OBJECTIVE: To investigate the role of bone morphogenetic protein-2 in hyperhomocysteinemia-induced vascular calcification.
METHODS: Human carotid wax samples were divided into a calcified group (n=29) and a non-calcified group (n=13) according to the presence or absence of calcified plaque. Sixteen ApoE-/- mice were randomly divided into a control group and a hyperhomocysteinemia group, with 8 mice in each group. Bone morphogenetic protein-2 vector was used to transfect rat thoracic artery smooth muscle A7r5 cells, and gradient concentration of homocysteine (50, 100, 200, and 400 μmol/L) was utilized to treat A7r5 cells. Calcification was detected by alizarin red staining and hematoxylin-eosin staining. The interaction of bone morphogenetic protein 2 with Runt-related transcription factor 2 was detected by immunofluorescence, and the expressions of bone morphogenetic protein 2, Runt-related transcription factor 2, and α-smooth muscle actin were detected by immunohistochemistry and western blot assay.
RESULTS AND CONCLUSION: (1) Human carotid artery tissue staining revealed that compared with the non-calcification group, inflammatory cells increased and calcification positive rate increased in the calcification group (P < 0.05). Compared with the non-calcification group, the expressions of bone morphogenetic protein-2 and Runt-related transcription factor 2 were up-regulated, and the expression of α-smooth muscle actin was decreased in the calcification group (all P < 0.05). (2) The staining of mouse arterial specimens exhibited that, the positive rate of calcified area in the hyperhomocysteinemia group was significantly higher than that in the control group (P < 0.05); serum homocysteine level in the hyperhomocysteinemia group was significantly higher than that in the control group (P < 0.05). Compared with the control group, the expressions of bone morphogenetic protein-2 and Runt-related transcription factor 2 were up-regulated, and the expression of α-smooth muscle actin was decreased in the hyperhomocysteinemia group (all P < 0.05). (3) A7r5 cell culture analysis demonstrated that with the increase of homocysteine concentration gradient, the degree of calcification, the content of bone morphogenetic protein-2 and Runt-related transcription factor 2 protein in A7r5 cells increased (P < 0.05), and the content of α-smooth muscle actin protein decreased (P < 0.05). (4) The A7r5 cell culture analysis of overexpressed bone morphogenetic protein 2 showed that the calcification degree of the overexpressed bone morphogenetic protein 2 group was increased compared with the corresponding control group, the β-sodium glycerophosphate group, and the homocysteine group. RUNt-related transcription factor 2 expression up-regulated (P < 0.05) and α-smooth muscle actin expression down-regulated (P < 0.05). (5) The expression of bone morphogenetic protein 2 increased in A7r5 cells cultured with homocysteine in calcified medium, and the expression of Runt-related transcription factor 2 increased with the increase of bone morphogenetic protein 2 expression. (6) The results confirm that bone morphogenetic protein-2 is a key target gene in the regulation of smooth muscle cell phenotypic transformation resulting in vascular calcification by hyperhomocysteinemia. Targeted regulation of bone morphogenetic protein-2 reduces hyperhomocysteinemia-induced vascular calcification.

Key words: vascular calcification, homocysteine, bone morphogenetic protein 2, Runt-related transcription factor 2, smooth muscle actin

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