中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (50): 8072-8076.doi: 10.3969/j.issn.2095-4344.2015.50.007

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

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. 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
  • 收稿日期:2015-10-16 出版日期:2015-12-03 发布日期:2015-12-03
  • 作者简介: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。
  • 基金资助:

    2015年度新乡市科技发展计划项目(15SF27)

Osteogenic differentiation of adipose-derived stem cells and the effect of melatonin on the bio-viability of differentiated cells

Lu Tan1, Wei Na2, Zhang Chao1, Dong Yu-zhen1   

  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
  • Received:2015-10-16 Online:2015-12-03 Published:2015-12-03
  • About author:Lu Tan, Studying for doctorate, Attending physician, Department of Orthopeadic Surgery, the First affiliated Hospital of Xinxiang Medical University, Weihui 453100, Henan Province, China
  • Supported by:

    Stem Cells; Adipose Tissue; Cell Differentiation; Osteoblasts; Melatonin; Tissue Engineering
    Funding: the Scientific Development Plan of Xinxiang City in 2015, No. 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。 

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

Abstract:

BACKGROUND: 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 osteogenic 
differentiation 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. 

 

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