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在细胞外基质中微调Fgf8形态基因梯度的heparan硫酸蛋白质甘油在细胞外基质中的微调

Mansi Gupta¹, Thomas Kurth¹, Fabian Heinemann²

¹CRTD - Center for Regenerative Therapies TU Dresden, Dresden, Germany.

Biophysical journal

|December 13, 2024

概括

特定的肝素硫酸蛋白糖 (HSPG) 调节斑马鱼胚胎中的纤维细胞生长因子8 (Fgf8) 分布. 在细胞外基质和细胞表面的这些相互作用控制Fgf8扩散和信号梯度.

科学领域:

发展生物学发展生物学
分子生物学分子生物学
生物化学生物化学

背景情况:

形态原体通过度梯度指导胚胎发育.
纤维细胞生长因子8 (Fgf8) 是胚胎组织中心至关重要的关键形态原体.
细胞外基质 (ECM) 在调节形态原梯度中的作用尚未完全理解.

研究的目的:

调查ECM中的肝硫酸蛋白质糖 (HSPG) 在体内如何影响Fgf8扩散和信号传递.
阐明HSPG在胚胎发育过程中调节Fgf8梯度形成的机制.

主要方法:

利用单分子光相关谱学 (SMFS) 来量化Fgf8-HSPG在活斑马鱼胚胎中的相互作用.
在细胞外空间中操纵HSPG度,观察Fgf8扩散的影响.
研究了细胞膜附着的HSPG在Fgf8受体复合体形成中的作用.

主要成果:

证明特定的HSPG直接在ECM内绑定Fgf8,影响其扩散动态.
表明改变HSPG水平会改变Fgf8扩散率和梯度概况.
证实了细胞表面的HSPG附着对于涉及Fgf8,其受体和HSPG的三元复合体形成至关重要.

结论:

通过限制扩散,HSPG在确定精确的Fgf8形态基因梯度方面发挥着至关重要的作用.
与ECM结合的HSPG和与细胞表面相关的HSPG都有助于Fgf8信号的空间调节.
这项研究揭示了通过HSPG-连接体相互作用调解的形态原梯度控制的新机制.

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