中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (37): 5961-5965.doi: 10.3969/j.issn.2095-4344.2015.37.011

• 组织构建细胞学实验 cytology experiments in tissue construction • 上一篇    下一篇

重组人CREG蛋白与溶酶体组织蛋白酶和M6P/IGFⅡR的相互作用

孙鸣宇,闫承慧,田孝祥,李  洋,韩雅玲     

  1. 解放军沈阳军区总医院全军心血管病研究所心内科,辽宁省沈阳市  110016
  • 出版日期:2015-09-10 发布日期:2015-09-10
  • 通讯作者: 韩雅玲,博士,院士,教授,博士生导师,解放军沈阳军区总医院全军心血管病研究所,辽宁省沈阳市 110016
  • 作者简介:孙鸣宇,女,1976年生,黑龙江省哈尔滨市人,汉族,2014年解放军第四军医大学毕业,博士,副主任医师,主要从事心血管病基础及临床的研究。
  • 基金资助:

    国家自然科学基金资助项目(81130072,81370243)

Interactions between the recombinant human CREG protein and cathepsins and M6P/IGFIIR

Sun Ming-yu, Yan Cheng-hui, Tian Xiao-xiang, Li Yang, Han Ya-ling     

  1. Department of Cardiology, Cardiovascular Research Institute of PLA, General Hospital of Shenyang Military Region, Shenyang 110016, Liaoning Province, China
  • Online:2015-09-10 Published:2015-09-10
  • Contact: Han Ya-ling, M.D., Academician, Professor, Doctoral supervisor, Department of Cardiology, Cardiovascular Research Institute of PLA, General Hospital of Shenyang Military Region, Shenyang 110016, Liaoning Province, China
  • About author:Sun Ming-yu, M.D., Associate chief physician, Department of Cardiology, Cardiovascular Research Institute of PLA, General Hospital of Shenyang Military Region, Shenyang 110016, Liaoning Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81130072, 81370243

摘要:

背景:以往研究证实,CREG是一种与M6P/IGFⅡR直接结合的溶酶体蛋白,并依赖于与M6P受体的相互作用有效转运至溶酶体。

目的:分析外源性CREG蛋白与溶酶体组织蛋白酶和M6P/IGFⅡR的相互作用关系及其对M6P/IGFⅡR表达变化及细胞内定位的影响。

方法:应用细胞免疫荧光双染和免疫共沉淀方法,观察外源性CREG蛋白与溶酶体组织蛋白酶和M6P/IGFⅡR的相互作用关系,并应用gain-of-function和loss-of-function模型,通过Western blot和细胞免疫荧光双染方法,观察CREG对M6P/IGFⅡR表达变化及细胞内定位的影响。

结果与结论:细胞免疫荧光双染和免疫共沉淀方法证实外源性CREG蛋白与溶酶体组织蛋白酶和M6P/IGFⅡR有直接相互作用关系;应用gain-of-function和loss-of-function模型进一步证实,CREG对M6P/IGFⅡR表达变化无影响,而影响其在细胞内的定位。提示外源性CREG蛋白定位于溶酶体,且与溶酶体组织蛋白酶和M6P/IGFⅡR有相互作用关系,并影响M6P/IGFⅡR的细胞内定位。

关键词: 组织构建, 组织工程, 巨噬细胞, E1A激活基因阻遏子, 溶酶体, 动脉粥样硬化, 国家自然科学基金

Abstract:

BACKGROUND: It has been found that cellular repressor of E1A-stimulated genes (CREG) is a lysosomal protein binding directly to the mannose-6-phosphate (M6P)/insulin-like growth factor II receptor (IGFIIR) and depends on the interaction with M6P receptors for efficient delivery to lysosomes

OBJECTIVE: To study the interactions between the exogenous CREG protein and cathepsins and M6P/IGFIIR and to confirm the effect of CREG protein on expression and distribution of M6P/IGFIIR.

METHODS: Double-stained immunofluorescence and coimmunoprecipitation were applied to observe the interactions between the exogenous CREG protein and cathepsin B, cathepsin L and M6P/IGFIIR. Using gain-of-function and loss-of-function approaches, the effect of CREG on expression and distribution of 
M6P/IGFIIR were studied by western blot assay and immunofluorescence staining.

RESULTS AND CONCLUSION: Double-stained immunofluorescence and coimmunoprecipitation analyses confirmed the direct interactions between the exogenous CREG protein and cathepsin B, cathepsin L and M6P/IGFIIR. It was verified that CREG plays a critical role not in the expression but in the distribution of M6P/IGFIIR using gain-of-function and loss-of-function approaches. These findings provide evidence that exogenous CREG protein is located in lysosomes and has interactions with cathepsins and M6P/IGFIIR, also CREG plays a critical role in the distribution of M6P/IGFIIR.

Key words: 组织构建, 组织工程, 巨噬细胞, E1A激活基因阻遏子, 溶酶体, 动脉粥样硬化, 国家自然科学基金

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