金属蛋白酶PAPP-A对于依赖IGF的冠状细胞分化和组织是必需的
Mette Harboe1, Kasper Kjaer-Sorensen1, Ernst-Martin Füchtbauer1
1Department of Molecular Biology and Genetics, Aarhus University, Universitetsbyen 81, 8000, Aarhus C, Denmark.
Scientific reports
|August 30, 2024
概括
金属蛋白酶PAPP-A对于在软骨中释放活性胰岛素类生长因子 (IGF) 是至关重要的. 它的缺失破坏了状细胞的组织,并损害了小鼠和斑马鱼的骨生长.
科学领域:
- 内分泌学 在内分泌学.
- 发展生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 胰岛素类生长因子 (IGF) 信号传递对于脊椎动物的生长和骨发育至关重要.
- 阻断IGF信号的失调会导致生长异常和骨缺陷.
- 结合IGF的蛋白质 (IGFBPs) 调节IGF的可用性,并且它们被PAPP-A等金属蛋白酶分裂是关键的监管步骤.
研究的目的:
- 研究妊娠相关血蛋白-A (PAPP-A) 在调节软骨内的IGF活性中的作用.
- 为了确定PAPP-A是否对状细胞的增殖,分化和骨生长至关重要.
主要方法:
- 对PAPP-A淘汰赛小鼠进行分析,这些小鼠表现出变化的股骨长度和生长板冠状细胞组织.
- 缺少pappaa基因的斑马鱼的表型特征,包括对梅克尔软骨和状细胞分化标记物的分析.
- 在斑马鱼模型中使用IGF-I的药理抑制和救援实验.
主要成果:
- PAPP-A淘汰赛小鼠的股骨长度减少,生长板冠状细胞组织不整.
- 斑马鱼缺乏pappaa显示缩的梅克尔软骨和受损的软骨细胞分化.
- 淘汰赛表型通过抑制IGF信号复制,并通过IGF-I治疗逆转.
结论:
- 需要PAPP-A活性来释放软骨中的生物活性IGF,支持正常的冠状细胞功能.
- 缺少PAPP-A会导致IGF信号受损,导致异常的淋巴细胞组织和骨生长受损.
- PAPP-A在脊椎动物骨发育中发挥着至关重要的作用,通过确保IGF在软骨中具有足够的生物利用性.
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