首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Impact of aging on rat bone marrow-derived stem cell chondrogenesis.
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Impact of aging on rat bone marrow-derived stem cell chondrogenesis.

机译:衰老对大鼠骨髓干细胞软骨形成的影响。

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Damaged articular cartilage rarely heals or regenerates in middle-aged and elderly adults, suggesting that the chondrogenic potential of mesenchymal stem cells declines with age. To test this hypothesis, we measured the responses of rat bone marrow-derived mesenchymal stem cells (BMSCs) to chondrogenic induction in vitro. BMSCs from immature rats (1 week old), young adult rats (12 weeks old), and old adult rats (1 year old) were analyzed for cartilage extracellular matrix (ECM) production. Histologic analysis showed strong cartilage ECM formation by BMSCs from 1-week-old rats, but not by BMSCs from 12-week-old or 1-year-old rats. Real-time polymerase chain reaction revealed age-related declines in messenger RNA encoding type II collagen, aggrecan, and link protein, three major cartilage ECM components. Microarray analysis indicated significant age-related differences in the expression of genes that influence cartilage ECM formation. These findings support the hypothesis that the chondrogenic potential of mesenchymal stem cells declines with age.
机译:受损的软骨在中老年人中很少愈合或再生,这表明间充质干细胞的软骨形成能力随着年龄的增长而下降。为了验证该假设,我们测量了大鼠骨髓间充质干细胞(BMSC)对体外软骨形成诱导的反应。分析来自未成熟大鼠(1周龄),成年幼鼠(12周龄)和成年雌鼠(1岁)的BMSC的软骨细胞外基质(ECM)产生。组织学分析显示,来自1周龄大鼠的BMSC具有很强的软骨ECM形成,但是来自12周龄或1岁大鼠的BMSC却没有。实时聚合酶链反应显示,年龄相关的编码II型胶原蛋白,聚集蛋白聚糖和连接蛋白(软骨ECM的三个主要成分)的信使RNA下降。微阵列分析表明影响软骨ECM形成的基因表达中与年龄有关的显着差异。这些发现支持以下假设:间充质干细胞的软骨形成能力会随着年龄的增长而下降。

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