脂肪来源干细胞向成骨分化及褪黑素干预细胞生物学活性的变化

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中国组织工程研究 第19卷 第50期 2015–12–03出版Chinese Journal of Tissue Engineering Research December 3, 2015 Vol.19, No.50P .O. Box 10002, Shenyang 110180 8072www.CRTER.org路坦,男,1982年生,河南省林州市人,汉族,在读博士,主治医师,主要从事脊柱骨关节外科和组织工程研究。

中图分类号:R394.2 文献标识码:A 文章编号:2095-4344 (2015)50-08072-05 稿件接受:2015-10-16 Lu Tan, Studying for doctorate, Attending physician, Department of Orthopeadic Surgery, the First affiliated Hospital of Xinxiang Medical University, Weihui 453100, Henan Province, ChinaAccepted: 2015-10-16脂肪来源干细胞向成骨分化及褪黑素干预细胞生物学活性的变化路 坦1,尉 娜2,张 超1,董玉珍1(1新乡医学院第一附属医院骨外科,河南省卫辉市 453100;2新乡医学院第三附属医院神经内二科,河南省新乡市 453003)文章亮点:1 脂肪来源干细胞成功向成骨细胞分化,对于获得的成骨细胞进行鉴定。

2 将褪黑素作用于脂肪干细胞成骨分化后的细胞,避免了褪黑素对干细胞向其他细胞分化的干扰。

3 褪黑素能促进脂肪来源干细胞成骨分化后细胞增殖及碱性磷酸酶活性表达,有利于骨缺损的修复,具有一定的创新性。

关键词:干细胞;脂肪干细胞;褪黑素;脂肪来源干细胞;成骨分化;成骨细胞;碱性磷酸酶 主题词:干细胞;脂肪组织;细胞分化;成骨细胞;褪黑激素;组织工程 基金资助:2015年度新乡市科技发展计划项目(15SF27)摘要背景:研究表明褪黑素能促进脂肪来源干细胞向神经元转化,但对脂肪来源干细胞成骨分化后细胞的作用报道较少。

目的:观察脂肪来源干细胞向成骨分化及褪黑素对成骨分化后细胞生物学活性的影响。

方法:①取昆明种小鼠附睾处脂肪利用Ⅰ型胶原酶消化法和差速贴壁法获取、纯化脂肪来源干细胞,应用CD44免疫组化染色对细胞进行鉴定。

②取第2代脂肪来源干细胞,加入成骨诱导培养基培养,行碱性磷酸酶染色和von Kossa 法检测细胞分化情况。

③取成骨诱导后的细胞,加入不同浓度的褪黑素,利用MTT 法检测24,48 h 时细胞增殖情况。

④取成骨诱导后的细胞,加入最佳浓度的褪黑素,分别检测加入药物3,6 d 时的碱性磷酸酶活性。

结果与结论:①接种48 h 后大多数细胞贴壁,接种后4 d 细胞呈现多种细胞形态,并形成大小不一的细胞集落,传代后的细胞形态趋于稳定,均称长梭型,培养细胞CD44呈阳性表达,阳性颗粒位于胞膜,呈棕黄色。

②成骨诱导后的细胞应用von Kossa 法染色呈阳性,黑色沉积物在细胞外的基质中呈网格状分布;碱性磷酸酶染色呈阳性,细胞内可见棕黑色颗粒。

③在24 h 和48 h 时间点,1,10,100 μmol/L 组的吸光度值明显大于空白组(P < 0.05),选择这3个浓度作为最佳的褪黑素浓度。

④各组成骨诱导后细胞内碱性磷酸酶活性随时间延长明显增加,差异有显著性意义(P < 0.05)。

褪黑素组(1,10,100 μmol/L)在3 d 时的碱性磷酸酶活性与空白组相比无明显差异(P > 0.05),在6 d 时较空白组明显增加(P < 0.05)。

提示褪黑素可以增强脂肪来源干细胞成骨分化后细胞增殖,并提高细胞内碱性磷酸酶活性。

路坦,尉娜,张超,董玉珍. 脂肪来源干细胞向成骨分化及褪黑素干预细胞生物学活性的变化[J].中国组织工程研究,2015,19(50):8072-8076. doi:10.3969/j.issn.2095-4344.2015.50.007Osteogenic differentiation of adipose-derived stem cells and the effect of melatonin on the bio-viability of differentiated cellsLu Tan 1, Wei Na 2, Zhang Chao 1, Dong Yu-zhen 1 (1Department of Orthopeadic Surgery, the First affiliated Hospital of Xinxiang Medical University, Weihui 453100, Henan Province, China; 2Second Department of Neurology, the Third Affiliated Hospital of Xinxiang Medical University, Xinxiang 453003, Henan Province, China)AbstractBACKGROUND: Studies have indicated that melatonin can promote the differentiation of adipose-derived stem cells into neurons, and the effect of melatonin on the osteoblasts form adipose-derived stem cells is rarely reported.OBJECTIVE: To observe the osteogenic differentiation of adipose-derived stem cells and the effect of melatonin on the bio-viability of differentiated cells.METHODS: (1) Adipose-derived stem cells were isolated and purified from the inguinal fat of Kunming mice by type I collagenase digestion and differential adhesion method, respectively. Immunohistochemical staining of CD44 was used as a quality control. (2) Osteogenic induction medium was added to induce osteogenicdifferentiation of passage 2 adipose-derived stem cells. Alkaline phosphatase staining and von Kossa method were combined to evaluate differentiation condition. (3) Melatonin at variable concentrations was added to treat mature osteocytes originated from adipose-derived stem cells and MTT was applied to determine their viability at 24 and 48 hours after culture respectively to find out optimal condition of melatonin treatment. (4) Melatonin at the optimal concentration was used to treat differentiated cells and detect alkaline phosphatase activity after 3 days and 6 days respectively.RESULTS AND CONCLUSION: (1) After seeding for 48 hours, most cells were adherent, and after 4 days, the cells displayed multiple shapes and colonies of different sizes formed. After subculture, cell morphology homogenized as spindle shape. Cells positive for CD44 were brownish yellow, and localized mainly on the cell membrane. (2) Differentiated cells were positive for von Kossa staining and black sediments scattered in the extracellular matrix. Alkaline phosphatase expressed positively, and brown-black particles, appeared within cells. (3) Melatonin supplement improved the viability of differentiated cells; and 1, 10 and 100 μmol/L was observed as the optimal concentrations both at 24 and 48 hours. (4) The intracellular alkaline phosphatatse activity was increased with time in all the groups (P <0.05). Compared with the blank group, the intracellular alkaline phosphatase activity in Melatonin groups (1, 10 and 100 μmol/L) had no changes at 3 days, but significantly increased at 6 days (P < 0.05). These findings indicate that melatonin can enhance the proliferation of osteocytes differentiated from adipose-derived stem cells, and improve the activity of intracellular alkaline phosphatase.Subject headings: Stem Cells; Adipose Tissue; Cell Differentiation; Osteoblasts; Melatonin; Tissue Engineering Funding: the Scientific Development Plan of Xinxiang City in 2015, No. 15SF27Lu T, Wei N, Zhang C, Dong YZ. Osteogenic differentiation of adipose-derived stem cells and the effect of melatonin on the bio-viability of differentiated cells. Zhongguo Zuzhi Gongcheng Yanjiu. 2015;19(50):8072-8076.0 引言 Introduction骨科常见疾病如骨折、骨肿瘤、骨结核等均能造成骨质缺损,常常需要植骨治疗,取大量自体骨损伤较大,且植骨存在着不融合的可能性,如何治疗骨缺损和提高植骨融合率一直困扰着患者和广大临床医生。