失调的 lysosomal exocytosis 在多种 lysosomal 疾病中驱动蛋白酶介导的软骨病原体
Jen-Jie Lee1, Tong Wang1, Kali Wiggins1
1JC Self Research Institute, Greenwood Genetic Center, Greenwood, SC 29646, USA.
iScience
|March 18, 2024
概括
溶酶体,动态细胞器,在溶酶体疾病模型中显示出增加的外细胞体,导致软骨缺陷. 抑制这个过程或cathepsin活动改善了软骨的发育,揭示了一个新的治疗点.
科学领域:
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
背景情况:
- 溶解体现在被理解为代谢调节的动态枢纽,而不仅仅是静态回收中心.
- lysosomal 疾病是由器官功能障碍引起的,但导致病理的确切机制仍在研究中.
- 了解溶酶体的移动性和功能对于破译遗传溶酶体疾病至关重要.
研究的目的:
- 调查 lysosomal exocytosis 在斑马鱼遗传 lysosomal 疾病模型的软骨发育中的作用.
- 为了确定失调的溶酶体外细胞形成,蛋白酶活性和软骨病原体之间的联系.
- 探索针对 lysosomal exocytosis 和蛋白酶活性的潜在治疗策略.
主要方法:
- 利用了三种不同的斑马鱼遗传性溶酶体疾病模型.
- 在成长中的软骨中量化溶酶体外细胞.
- 评估了软骨发育,甲蛋白酶活性和TGFβ信号传递.
- 采用小分子抑制剂来阻断外细胞和甲素活性.
主要成果:
- 在所有三种 lysosomal 疾病斑马鱼模型的发育软骨中显示出 lysosomal exocytosis 的增加.
- 相关失调的外细胞形成与软骨发育受损和加素蛋白酶活性升高.
- 在这些模型中表明,甲素和TGFβ信号通路介导了病变发生.
- 在抑制甲素活性或表细胞突变后,在软骨表型中观察到显著的改善.
结论:
- 无法控制的 lysosomal exocytosis 在 lysosomal 疾病中有助于软骨病变.
- 由 lysosomal 酶释放驱动的过度细胞外蛋白酶活性,是软骨缺陷的基础.
- 向 lysosomal exocytosis 和 cathepsin 活性为影响软骨的 lysosomal 疾病提供了潜在的治疗途径.
- 在早期组织发育过程中,对 lysosomal exocytosis 的药理增强可能是有害的.
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