中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (9): 1370-1375.doi: 10.3969/j.issn.2095-4344.0466

• 脂肪干细胞 adipose-derived stem cells • 上一篇    下一篇

1,25(OH)2D3对脂肪干细胞分泌Ⅰ型胶原的影响及作用机制

翟 敏1,胡晓根2,刘虹麟1,许世清1,王 在1,张文健1   

  1. 中日友好医院,1临床医学研究所,2整形外科,北京市 100029
  • 修回日期:2018-01-29 出版日期:2018-03-28 发布日期:2018-04-03
  • 通讯作者: 张文健,博士,硕士生导师,教授,研究员,中日友好医院临床医学研究所,北京市 100029; 并列通讯作者:王在,博士,副研究员,中日友好医院临床医学研究所,北京市 100029
  • 作者简介:翟敏,女,1989年生,山东省济南市人,汉族,中日友好医院临床医学研究所在读硕士,主要从事干细胞诱导分化等方面的研究工作。
  • 基金资助:

    国家自然科学基金(81370873,81402451);中日友好医院青年科技英才计划(2015-QNYC-B-06)

Effect of 1,25(OH)2D3 on type I collagen secretion in adipose-derived mesenchymal stem cells and its mechanism

Zhai Min1, Hu Xiao-gen2, Liu Hong-lin1, Xu Shi-qing1, Wang Zai1, Zhang Wen-jian1   

  1. 1Institute of Clinical Medical Sciences, 2Department of Plastic Surgery, China-Japan Friendship Hospital, Beijing 100029, China
  • Revised:2018-01-29 Online:2018-03-28 Published:2018-04-03
  • Contact: Zhang Wen-jian, Ph.D., Master’s supervisor, Professor, Investigator, Institute of Clinical Medical Sciences, China-Japan Friendship Hospital, Beijing 100029, China; Wang Zai, M.D., Associate investigator, Institute of Clinical Medical Sciences, China-Japan Friendship Hospital, Beijing 100029, China
  • About author:Zhai Min, Master candidate, Institute of Clinical Medical Sciences, China-Japan Friendship Hospital, Beijing 100029, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81370873, 81402451; the Talent Youth Plan of the China-Japan Friendship Hospital, No. 2015-QNYC-B-06

摘要:

文章快速阅读:

文题释义:
创面愈合:
指体内外因素使皮肤等组织出现离断或缺损后的修复过程,大致可分为止血期、炎症期、增生期、重塑期4个阶段。对于正常愈合过程,上述4个阶段必须以正确的顺序在特定的时间内完成,超过6-8周即可认为慢性创面愈合不良。
Ⅰ型胶原:胶原蛋白是动物体中普遍存在的一种大分子蛋白,在哺乳动物中的含量是整个生物体自身总蛋白含量的1/4。Ⅰ型胶原蛋白在骨骼与结缔组织中发挥作用的主要方式是形成和保持骨架的完整性;除此之外,胶原在形成特定的细胞外微环境中也起到主要作用,而这些微环境对于维持细胞的完整性及传递细胞外信号非常关键。

 

摘要
背景:
脂肪间充质干细胞具有促进创伤修复的作用,但其分泌的Ⅰ型胶原会促进瘢痕形成,因此,寻找抑制脂肪间充质干细胞分泌胶原的方法将进一步增强其应用价值。  
目的:观察1,25(OH)2D3对脂肪间充质干细胞分泌Ⅰ型胶原的影响及其作用机制。
方法:①利用胶原酶消化法分离培养人脂肪间充质干细胞,将第4代脂肪间充质干细胞分别培养在含不同浓度(10-7,10-8,10-9,10-10,0 mol/L)1,25(OH)2D3的DMEM/F12培养基中干预4 d,收集细胞培养上清,采用ELISA方法检测Ⅰ型胶原水平;②选取1,25(OH)2D3抑制Ⅰ型胶原分泌作用最明显的浓度对脂肪间充质干细胞进行干预,通过Real-time PCR检测1,25 (OH)2D3干预前后细胞内Smad3的mRNA表达,Western blot检测1,25(OH)2D3干预前后细胞内Smad3总蛋白和磷酸化蛋白表达;③在1,25(OH)2D3干预基础上加入SMAD3抑制剂SIS3对脂肪间充质干细胞进行干预,4 d后收集细胞培养上清,采用ELISA方法检测Ⅰ型胶原水平,以分析Smad3信号通路在其中的作用。
结果与结论:①1,25(OH)2D3对人脂肪间充质干细胞分泌Ⅰ型胶原的影响表现为剂量依赖性抑制作用;②Real-time PCR和Western blot结果显示1,25(OH)2D3干预后Smad3表达水平有一定升高;Western blot结果显示磷酸化Smad3蛋白含量显著升高;③Smad3抑制剂可阻断1,25(OH)2D3对Ⅰ型胶原分泌的抑制作用;④这些结果表明,1,25(OH)2D3可能通过上调Smad3的表达及活性来抑制人脂肪间充质干细胞分泌Ⅰ型胶原。

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
ORCID: 0000-0002-5112-1115(翟敏)

关键词: 人脂肪间充质干细胞, 1, 25(OH)2D3, Ⅰ型胶原, SMAD3, 瘢痕, 干细胞, 国家自然科学基金

Abstract:

BACKGROUND: Adipose-derived mesenchymal stem cells (ADMSCs) have been reported to improve wound healing. However, type I collagen secreted by ADMSCs will contribute to scar formation. Therefore, inhibiting type I collagen secretion from ADMSCs will strengthen its clinical application.
OBJECTIVE: To investigate the effect of 1,25(OH)2D3 on secretion of type I collagen by ADMSCs and its mechanism.
METHODS: Human ADMSCs were isolated by collagenase digestion, and identified by flow cytometry. ADMSCs at passage 4 were cultured in DMEM/F12 medium containing different concentrations of 1,25(OH)2D3 (10-7, 10-8, 10-9, 10-10 and 0 mol/L) respectively for 4 days. Then, the concentration of type I collagen in cell supernatant was measured by ELISA. Real-time PCR and western blot were used to detect the expression of Smad3 at mRNA and protein levels and phosphorylated protein Smad3 level in ADMSCs cultured with and without 1,25(OH)2D3. To analyze the contribution of Smad3 to the effect of 1,25(OH)2D3, Smad3 inhibitor was added to culture medium 30 minutes before adding 1,25(OH)2D3, and type I collagen in cell supernatant was detected by ELISA at 4 days after addition of SMAD3 inhibitor.
RESULTS AND CONCLUSION: 1,25(OH)2D3 inhibited the secretion of type I collagen by ADMSCs in a dose-dependent manner. The results of real-time PCR and western blot showed that the expression of Smad3 was upregulated by 1,25(OH)2D3, and the results of western blot showed that the phosphorylated Smad3 protein level in ADMSCs was significantly increased by 1,25(OH)2D3. Moreover, the inhibition of type I collagen secretion by 1,25(OH)2D3 could be blocked by Smad3 inhibitor. These results indicate that 1,25(OH)2D3 can inhibit the secretion of type I collagen from ADMSCs by up-regulating the expression of Smad3.

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

Key words: Adipose Tissue, Mesenchymal Stem Cells, Calcitriol, Collagen Type I, Smad3 Protein, Tissue Engineering

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