中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (22): 3549-3555.doi: 10.3969/j.issn.2095-4344.1281

• 材料生物相容性 material biocompatibility • 上一篇    下一篇

葡萄糖依赖性肠促胰岛素类似物DAIa2GIP对大鼠膝关节损伤软骨的保护效应

杨  烜,韩鹏飞,周  新,卢建功,王世川,王宇泽
  

  1. 山西医科大学第二医院骨科骨与软组织损伤修复山西省重点实验室,山西省太原市  030001
  • 收稿日期:2019-03-14
  • 通讯作者: 王宇泽,医学博士,副主任医师,山西医科大学第二医院骨科骨与软组织损伤修复山西省重点实验室,山西省太原市 030001
  • 作者简介:杨烜,男,1983年生,甘肃省平凉市人,汉族,山西医科大学在读硕士,主治医师,主要从事关节方面的研究。
  • 基金资助:

    国家自然科学基金(31200728),项目负责人:王宇泽;山西医科大学第二医院博士启动基金(20120408),项目负责人:王宇泽

Protective effect of glucose-dependent incretin analogue DAIa2GIP on knee cartilage injury of rats

Yang Xuan, Han Pengfei, Zhou Xin, Lu Jiangong, Wang Shichuan, Wang Yuze
  

  1. Department of Orthopedics, Second Hospital of Shanxi Medical University, Shanxi Provincial Key Laboratory of Bone and Soft Tissue Injury Repair, Taiyuan 030001, Shanxi Province, China
  • Received:2019-03-14
  • Contact: Wang Yuze, MD, Associate chief physician, Department of Orthopedics, Second Hospital of Shanxi Medical University, Shanxi Provincial Key Laboratory of Bone and Soft Tissue Injury Repair, Taiyuan 030001, Shanxi Province, China
  • About author:Yang Xuan, Master candidate, Attending physician, Department of Orthopedics, Second Hospital of Shanxi Medical University, Shanxi Provincial Key Laboratory of Bone and Soft Tissue Injury Repair, Taiyuan 030001, Shanxi Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 31200728 (to WYZ); the Doctoral Startup Foundation of the Second Hospital of Shanxi Medical University, No. 20120408 (to WYZ)

摘要:

文章快速阅读:

 

文题释义:
葡萄糖依赖性促胰岛素分泌多肽:是由位于十二指肠和空肠的K细胞分泌的一个由42个氨基酸残基构成的多肽,其受体是一种Ⅱ型蛋白偶联受体,葡萄糖依赖性促胰岛素分泌多肽与胰岛β细胞的相应受体相互结合,提高cAMP水平,进一步升高胞内钙离子浓度,最终增强含有胰岛素分泌小泡的胞吐作用。但葡萄糖依赖性促胰岛素分泌多肽的半衰期较短,为2-7 min。
DAIa2GIP:由于葡萄糖依赖性促胰岛素分泌多肽的半衰期较短,故在葡萄糖依赖性促胰岛素分泌多肽的基础上,用同分异构体的右旋丙氨酸取代了第2位的左旋丙氨酸,形成了葡萄糖依赖性肠促胰岛素类似物DAla2GIP,这样可以增加葡萄糖依赖性促胰岛素分泌多肽对二肽基肽酶Ⅳ裂解作用的抵抗性,使其半衰期明显延长至5.0-6.0 h。
 
 
背景:已有研究证实,葡萄糖依赖性肠促胰岛素类似物DAla2GIP可直接调节成骨细胞的生长发育,但有关其在软骨细胞上的作用鲜有报道。
目的:探讨葡萄糖依赖性肠促胰岛素类似物DAIa2GIP对SD大鼠骨性关节炎软骨损伤的保护效应及潜在机制。
方法:将50只雄性SD大鼠(山西医科大学实验动物中心提供)随机分5组,每组10只:正常对照组不进行任何干预;模型对照组、模型治疗组切断双后膝关节前交叉韧带、内侧副韧带并摘除内侧半月板;假手术对照组、假手术治疗组只打开双侧膝关节囊。造模后第8周,模型治疗组、假手术治疗组腹腔注射25 nmol/kg的DAIa2GIP,模型对照组、假手术对照组腹腔注射等量生理盐水,2次/周,注射8周。造模16周后,取各组大鼠膝关节,进行苏木精-伊红染色、番红O-固绿染色、透射电镜观察及免疫组织化学染色。实验方案经山西医科大学伦理委员会批准(2017008)。
结果与结论:①苏木精-伊红染色显示,模型对照组软骨4层结构不清;模型治疗组软骨可见4层结构,软骨层较模型对照组增厚;其余3组软骨表面光滑,4层结构清晰;②番红O-固绿染色显示,模型对照组蛋白多糖表达明显不均匀,软骨厚度变薄;模型治疗组蛋白多糖表达基本均匀,软骨厚度较模型对照组增加;其余3组蛋白多糖表达均匀,软骨厚度适中;③透射电镜显示,模型对照组软骨细胞胞质内可见脂滴,线粒体、粗面内质网等细胞器消失;模型治疗组可见数量不等线粒体、粗面内质网等细胞器,并且结构基本恢复正常;其余组细胞结构正常;④免疫组织化学染色显示,与正常对照组比较,模型对照组胶原酶13蛋白表达升高(P < 0.05),Ⅱ型胶原蛋白表达降低(P < 0.05);与模型对照组比较,模型治疗组胶原酶13蛋白表达降低(P < 0.05),Ⅱ型胶原蛋白表达升高(P < 0.05);⑤结果表明,DAIa2GIP可能通过抑制关节软骨中胶原酶13表达、减少Ⅱ型胶原的破坏,对SD大鼠骨性关节炎中关节软骨发挥保护作用。

关键词: 葡萄糖依赖性肠促胰岛素类似物, GIP, DAIa2GIP, 骨性关节炎, 胶原酶13, Ⅱ型胶原, 软骨细胞, 软骨损伤

Abstract:

BACKGROUND: Glucose-dependent incretin analogue DAIa2GIP has been shown to directly regulate the growth and development of osteoblasts, but its effect on chondrocytes is rarely reported.
OBJECTIVE: To investigate the protective effect and potential mechanism of glucose-dependent incretin analogue DAIa2GIP on cartilage injury in Sprague-Dawley rats with osteoarthritis.
METHODS: Fifty male Sprague-Dawley rats provided by Laboratory Animal Center of Shanxi Medical University were randomly divided into five groups (n=10/group): normal control group (no intervention), model control group (anterior cruciate ligament and medial collateral ligament resection, and medial meniscus removal at bilateral posterior knees + normal saline), model treatment group (anterior cruciate ligament and medial collateral ligament resection, and medial meniscus removal at bilateral posterior knees + 25 nmol/kg DAIa2GIP) and sham control group (opening articular capsule of bilateral knees + normal saline), and sham treatment group (opening articular capsule of bilateral knees + 25 nmol/kg DAIa2GIP). The intraperitoneal administration was given at 8 weeks after modeling, twice weekly for 8 consecutive weeks. The knee joint was removed at 16 weeks after modeling for hematoxylin-eosin staining, safranin O-fast green staining, transmission electron microscope and immunohistochemistry. The study was approved by the Ethics Committee of Shanxi Medical University, approval number: 2017008.
RESULTS AND CONCLUSION: (1) Hematoxylin-eosin staining: the four layers of the cartilage structure in the model control group were obscure. The four layers of the cartilage structure were visible in the model treatment group, and the cartilage lay was thicker than that in the model group. In the other three groups, the cartilage surface was smooth with clear four layers. (2) Safranin O-fast green staining: the expression of proteoglycan in the model control group was uneven, and cartilage thickness was thin. The expression of proteoglycan in the model treatment group was even, and the cartilage thickness was increased compared with the model control group. The expression of proteoglycan in the other three groups was even, with moderate cartilage thickness. (3) Transmission electron microscope: there were lipid droplets in the model control group, and mitochondria and rough endoplasmic reticulum disappeared. In the model treatment group, some mitochondria and rough endoplasmic reticulum were observed, and the structure returned to be normal. The other three groups showed the normal structure. (4) Immunohistochemistry: compared with the normal control group, the expression level of collagenase 13 was significantly increased (P < 0.05), and the expression level of collagen type II was significantly decreased in the model control group (P < 0.05). Compared with the model control group, the expression level of collagenase 13 was significantly decreased (P < 0.05), and the expression level of collagen type II was significantly increased in the model treatment group (P < 0.05). (5) To conclude, DAIa2GIP exerts protective effect on articular cartilage in Sprague-Dawley rats with osteoarthritis possibly by inhibiting the expression of collagenase 13 and reducing collagen type II destruction in articular cartilage.

Key words: glucose-dependent incretin analogue, GIP, DAIa2GIP, osteoarthritis, collagenase 13, collagen type II, chondrocytes, cartilage injury

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