与年龄相关的骨矿物质运输和骨基质蛋白质的衰减在骨质母细胞中的骨质母细胞
Irina L Tourkova1,2, Quitterie C Larrouture1,2, Kelechi M Onwuka1,2
1Research Service, VA Medical Center, Pittsburgh, Pennsylvania, United States.
American journal of physiology. Cell physiology
|July 31, 2023
概括
老龄化会减少关键的骨构建蛋白质和矿物质的运输在小鼠,导致骨质疏松症. 骨质母细胞和脑筋干细胞的与年龄相关的下降涉及改变的信号通路.
科学领域:
- 骨生物学 骨生物学
- 细胞和分子生物学是细胞和分子生物学.
- 老年学是一门学科.
背景情况:
- 随着年龄的增长,骨矿物质密度下降,导致骨折和骨折.
- 骨质母细胞对于骨形成至关重要,合成基因蛋白和调节矿物质运输.
- 衰老会影响细胞功能,包括骨质母细胞及其前体干细胞.
研究的目的:
- 为了研究骨质细胞骨矿物质运输和矩阵蛋白质表达的与年龄相关的变化.
- 为了比较混合骨髓细胞群和体外分化的骨质母细胞中的这些变化.
- 探索受衰老影响的潜在分子信号通路.
主要方法:
- 从年轻和老老小鼠的骨髓细胞和分化骨质母细胞中分析mRNA和蛋白质表达 (西部斑).
- 微型计算机断层扫描 (微型CT) 用于评估骨结构.
- 对信号分子 (Erk1/2,Smad2,β-catenin) 的途径分析.
主要成果:
- 在两种细胞类型中,衰老显著降低了矿物质运输蛋白 (例如性酸酶) 和矩阵蛋白 (例如原1) 的mRNA.
- 像中性酸盐运输体2 (NPT2) 这样的特定蛋白质没有显示出与年龄相关的减少.
- 来自老老鼠的骨质母细胞表现出减少的Erk1/2酸化和改变的WNT/TGFβ通路信号.
- 老小鼠的椎骨与年轻小鼠相比,具有骨质疏松性.
结论:
- 与年龄相关的骨损失的特点是选择性下调特定的骨矿物质运输和矩阵合成蛋白质.
- 骨质母细胞和骨干细胞的这些变化与关键信号通路的失调有关.
- 流体干细胞表现出"年龄记忆",影响它们的分化潜力.
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