在体和生殖系干细胞中JAK/STAT信号的计算模拟
1Department of Medicine, University of California San Diego, La Jolla, California, USA.
概括
计算模拟显示,连接体暴露时间决定了Janus激酶/信号转换器和转录激活器 (JAK/STAT) 途径对异色染色素的影响. 胚胎干细胞 (GSCs) 中的持续信号保持稳定性,与体组织中的短暂信号不同.
科学领域:
- 细胞生物学 细胞生物学
- 系统生物学 系统生物学
- 发展生物学 发展生物学
背景情况:
- 简氏激酶/信号转换器和转录激活器 (JAK/STAT) 途径调节关键细胞过程,包括细胞生长,分化和免疫.
- 信号传感器和转录激活剂 (STAT) 蛋白质的酸化将它们转化为活性转录因子 (pSTAT),而非化STAT (uSTAT) 则保持异色染色体的稳定性.
- 在Drosophila体组织与男性生殖系干细胞 (GSCs) 中观察到JAK/STAT通路激活对异色染色体稳定性的相反影响.
研究的目的:
- 在不同的细胞环境下计算剖析JAK/STAT通路激活,特别是模仿体细胞和生殖细胞.
- 调查JAK/STAT信号对不同类型的多索菲拉细胞中异性染色素稳定性的悖论性影响的机制.
- 确定连接体刺激持续时间在调节JAK/STAT通路活性及其下游后果中的作用.
主要方法:
- 利用使用普通微分方程的计算模拟来建模控制JAK/STAT信号的化学反应.
- 开发模型来复制不同的细胞环境,包括短暂的连接体刺激 (体细胞) 和持续的连接体刺激 (GSCs).
- 在不同的联体暴露条件下分析了化STAT (pSTAT) 和非化STAT (uSTAT) 的平衡水平.
主要成果:
- 身体组织的特征是过时的连接体刺激,导致 uSTAT 水平暂时下降.
- 持续的连接体刺激,普遍存在于GSC的利基市场,导致在平衡时 uSTAT水平升高.
- 计算模型成功地复制了JAK/STAT激活在模拟体细胞和生殖细胞中 uSTAT水平上的差异效应.
结论:
- 连接体暴露的持续时间是一个关键因素,解释了JAK/STAT通路激活对 heterochromatin 稳定性的相反影响.
- 持续的JAK/STAT信号在GSC中,由连续的连接物供应驱动,通过保持更高的uSTAT水平来促进异染色体稳定性.
- 在体组织中,暂时的JAK/STAT信号导致由于 uSTAT 水平降低而导致异染色素的损失.
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