The effect of mechanical stretch stress on the differentiation and apoptosis of human growth plate chondrocytes

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• 作者：Keming Sun ; Fangna Liu ; Junjian Wang…
• 关键词：Stretch stress ; Growth plate ; Chondrocytes ; Differentiation ; Apoptosis
• 刊名：In Vitro Cellular & Developmental Biology - Animal
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：53
• 期：2
• 页码：141-148
• 全文大小：
• 刊物主题：Cell Biology; Developmental Biology; Stem Cells; Cell Culture; Animal Genetics and Genomics;
• 出版者：Springer US
• ISSN：1543-706X
• 卷排序：53

文摘

The study is aimed to investigate the effect of stretch stress with different intensities on the differentiation and apoptosis of human plate chondrocytes. In the present study, the human epiphyseal plate chondrocytes were isolated and cultured in vitro. Toluidine blue staining and type II collagen immunohistochemical staining were used to identify the chondrocytes. Mechanical stretch stresses with different intensities were applied to intervene cells at 0-, 2000-, and 4000-μ strain for 6 h via a four-point bending system. The expression levels of COL2, COL10, Bax, Bcl-2, and PTHrp were detected by quantitative RT-PCR. Under the intervention of 2000-μ strain, the expression levels of COL2, COL10, and PTHrp increased significantly compared with the control group (P < 0.05), and the expression level of PCNA was also increased, but the difference was not statistically significant (P > 0.05). Under 4000-μ strain, however, the expression levels of PCNA, COL2, and PTHrp decreased significantly compared with the control group (P < 0.05), and the expression level of COL10 decreased slightly (P > 0.05). The ratio of Bcl-2/Bax gradually increased with the increase of stimulus intensity; both of the differences were detected to be statistically significant (P < 0.05). In conclusion, the apoptosis of growth plate chondrocytes is regulated by mechanical stretch stress. Appropriate stretch stress can effectively promote the cells’ proliferation and differentiation, while excessive stretch stress inhibits the cells’ proliferation and differentiation, even promotes their apoptosis. PTHrp may play an important role in this process.