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首页> 外文期刊>Journal of Cellular Physiology >Role of PTHrP(1-34) Pulse Frequency Versus Pulse Duration to Enhance Mesenchymal Stromal Cell Chondrogenesis
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Role of PTHrP(1-34) Pulse Frequency Versus Pulse Duration to Enhance Mesenchymal Stromal Cell Chondrogenesis

机译:PTHrP角色(猴)脉冲频率和脉冲持续提高间充质基质细胞软骨形成

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Generation of phenotypically stable, articular chondrocytes from mesenchymal stromal cells (MSCs) is still an unaccomplished task, with formation of abundant, hyaline extracellular matrix, and avoidance of hypertrophy being prime challenges. We recently demonstrated that parathyroid hormone-related protein (PTHrP) is a promising factor to direct chondrogenesis of MSCs towards an articular phenotype, since intermittent PTHrP application stimulated cartilage matrix production and reduced undesired hypertrophy. Wehere investigated the role of frequency, pulse duration, total exposure time, and underlying mechanisms in order to unlock the full potential of PTHrP actions. Human MSC subjected to in vitro chondrogenesis for six weeks were exposed to 2.5 nM PTHrP(1-34) pulses from days 7 to 42. Application frequency was increased from three times weekly (3 x 6 h/week) to daily maintaining either the duration of individual pulses (6 h/day) or total exposure time (18 h/week; 2.6 h/day). Daily PTHrP treatment significantly increased extracellular matrix deposition regardless of pulse duration and suppressed alkaline-phosphatase activity by 87%. High total exposure time significantly reduced cell proliferation at day 14. Pulse duration was critically important to significantly reduce IHH expression, but irrelevant for PTHrP-induced suppression of the hypertrophic markers MEF2C and IBSP. COL10A1, RUNX2, and MMP13 expression remained unaltered. Decreased IGFBP-2, -3, and -6 expression suggested modulated IGF-I availability in PTHrP groups, while drop of SOX9 protein levels during the PTHrP-pulse may delay chondroblast formation and hypertrophy. Overall, the significantly optimized timing of PTHrP-pulses demonstrated a vast potential to enhance chondrogenesis of MSC and suppress hypertrophy possibly via superior balancing of IGF- and SOX9-related mechanisms. (C) 2016 Wiley Periodicals, Inc.
机译:代的表型稳定,关节软骨细胞与间充质基质细胞(msc)仍然是一个未完成的任务形成丰富,透明细胞外矩阵,避免肥大'挑战。甲状旁腺(PTHrP)是一种与荷尔蒙相关的蛋白质有前途的因素直接的msc软骨形成对一个关节表型,因为间歇PTHrP应用刺激软骨基质生产和减少不受欢迎的肥大。频率、脉冲持续时间、总曝光时间、为了解开和底层机制PTHrP行动的全部潜力。进行体外软骨形成了六个周被暴露于2.5 nM PTHrP(猴)脉冲从7天到42。从三次每周增加(3 x 6小时/周)日常维护的时间单个脉冲(6小时/天)或全部曝光时间(18 h /周;治疗显著增加细胞外矩阵沉积与脉冲持续时间无关和抑制碱性磷酸酶活性87%。在第14天减少细胞增殖。持续时间是至关重要的显著降低本次事件表达式,但是无关紧要的PTHrP-induced抑制肥厚性标记MEF2C IBSP。RUNX2, MMP13表情依然没有改变。减少IGFBP-2 3和6的表达建议在PTHrP调制IGF-I可用性组,而期间SOX9蛋白水平的下降PTHrP-pulse可能推迟成软骨细胞形成和肥大。优化PTHrP-pulses表现出的时机MSC的巨大潜力提高软骨形成和抑制肥大可能通过优越的平衡IGF -和SOX9-related机制。(C) 2016年威利期刊公司。

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