中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (26): 4123-4126.doi: 10.12307/2022.813

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

增龄对大鼠髂总动脉超微结构的影响

董丽萍1,2,罗  佳1,李广意1,袁  衡1   

  1. 1长沙医学院,人体解剖与组织胚胎学教研室,院士工作站,功能核酸基础与临床湖南省重点实验室,湖南省长沙市  410219;2中南大学湘雅药学院,湖南省长沙市  410013
  • 收稿日期:2021-10-13 接受日期:2021-11-19 出版日期:2022-09-18 发布日期:2022-03-07
  • 通讯作者: 董丽萍,讲师,长沙医学院,人体解剖与组织胚胎学教研室,院士工作站,功能核酸基础与临床湖南省重点实验室,湖南省长沙市 410219;中南大学湘雅药学院,湖南省长沙市 410013
  • 作者简介:董丽萍,女,1984年生,2019年中南大学毕业,博士,讲师,主要从事血管重建方面的研究。
  • 基金资助:
    湖南省教育厅双一流学科优秀青年项目(19B071),项目负责人:董丽萍;长沙市杰出创新青年培养计划(kq2106076),项目负责人:董丽萍

Effect of aging on the ultrastructure of common iliac artery in rats

Dong Liping1, 2, Luo Jia1, Li Guangyi1, Yuan Heng1   

  1. 1Department of Histology and Embryology, Academician Work Station, Changsha Medical University, Changsha 410219, Hunan Province, China; 2Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, Hunan Province, China
  • Received:2021-10-13 Accepted:2021-11-19 Online:2022-09-18 Published:2022-03-07
  • Contact: Dong Liping, Department of Histology and Embryology, Academician Work Station, Changsha Medical University, Changsha 410219, Hunan Province, China; Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, Hunan Province, China
  • About author:Dong Liping, MD, Lecturer, Department of Histology and Embryology, Academician Work Station, Changsha Medical University, Changsha 410219, Hunan Province, China; Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, Hunan Province, China
  • Supported by:
    the Foundation of Hunan Educational Committee, No.19B071 (to DLP); the Training Program for Excellent Young Innovators of Changsha, No. kq2106076 (to DLP)

摘要:

文题释义:
收缩型血管平滑肌细胞:是分化程度高的成熟型细胞,形态结构为梭形,胞质内含有丰富的肌丝束、致密体和致密斑,而线粒体、粗面内质网和高尔基体等细胞器很少,对外界刺激产生收缩反应。
合成型血管平滑肌细胞:是不成熟的未分化型细胞,呈纤维母细胞形态,内含极少肌丝,几乎没有致密体和致密斑,但含大量的线粒体、粗面内质网和高尔基复合体,具有旺盛的分裂和增殖合成功能。

背景:老化伴随着多个器官结构和功能的进行性下降,动脉血管的结构和功能在老化过程中受到损害。
目的:观察增龄对动脉管壁超微结构的影响。
方法:成年SD大鼠5只及老年SD大鼠5只,在大鼠麻醉状态下取髂总动脉,放入戊二醛中固定,利用透射电子显微镜观察髂总动脉内膜和中膜的超微结构。
结果与结论:①成年大鼠髂总动脉内皮细胞间的连接正常;老年大鼠髂总动脉内皮细胞连接间出现较大的间隙;②成年大鼠髂总动脉中膜平滑肌细胞为收缩表型,细胞外基质中有较多的弹性纤维;老年大鼠髂总动脉平滑肌细胞为合成表型,细胞外基质中胶原纤维明显增多;③老年大鼠髂总动脉观察到有正在死亡的内皮细胞和平滑肌细胞,特征为染色质降解和细胞裂解,而在成年大鼠没有观察到细胞死亡的情况;④结果表明,与成年大鼠相比,老年大鼠髂总动脉内膜增厚,中膜平滑肌细胞呈合成表型,弹性纤维减少、胶原纤维增多。

https://orcid.org/0000-0003-0260-250X (董丽萍) 

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 老年大鼠, 髂总动脉, 内膜, 内皮细胞, 细胞外基质, 中膜, 平滑肌细胞, 超微结构

Abstract: BACKGROUND: Aging is accompanied by a progressive decline in the structure and function of multiple organs. The structure and function of arterial vessels are impaired during the aging process.  
OBJECTIVE: To observe the effect of aging on the ultrastructure of arterial wall. 
METHODS: Five adult Sprague-Dawley rats and five aged Sprague-Dawley rats were selected. The common iliac artery of the rats was taken under anesthesia and fixed in glutaraldehyde, and the ultrasonography of the intima and media of the common iliac artery was observed using a transmission electron microscope. 
RESULTS AND CONCLUSION: The connection between endothelial cells of the common iliac artery in adult rats was normal, while there was a relatively large gap between endothelial cells of the common iliac artery in aged rats. Smooth muscle cells of the common iliac artery in adult rats exhibited a contractile phenotype, and there were many elastic fibers in the extracellular matrix; in aged rats, smooth muscle cells presented with a synthetic phenotype, and the number of collagen fibers in the common iliac artery was significantly increased. Dead endothelial cells and smooth muscle cells, characterized by chromatin degradation and cell lysis, were observed in the common iliac artery of aged rats, whilst  no cell death was observed in adult rats. These findings indicate that the intima of the common iliac artery is thickened, smooth muscle cells present with a synthetic phenotype, the number of elastic fibers is reduced and the number of collagen fibers is increased in aged rats compared with adult rats.

Key words: aged rat, common iliac artery, intima, endothelial cell, extracellular matrix, media, smooth muscle cell, ultrastructure

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