NO-ferroheme 是血管系统中的一个信号实体
Andrei L Kleschyov1,2, Zhengbing Zhuge3, Tomas A Schiffer3
1Department of Physiology and Pharmacology, Biomedicum, Karolinska Institutet, Solna, Sweden. andrey.kleshchev@ki.se.
Nature chemical biology
|September 14, 2023
概括
移动的NO-ferroheme物种,不是自由的氧化 (NO),有效地转化NO类生物活性. 这些物种激活信号通路并放松血管,这表明它们是血管系统中关键的信号实体.
科学领域:
- 生物化学 生物化学
- 生理学 生理学 生理学
- 分子生物学分子生物学
背景情况:
- 氧化 (NO) 合成酶 (NOS) 信号传递在生物学中至关重要,但其精确的化学介质仍然不清楚.
- 了解NOS衍生生物活性的确切性质对于破译血管信号至关重要.
研究的目的:
- 通过NOS.调解NO类生物活性的化学性质.
- 为了确定移动NO-ferroheme物种是否可以作为信号实体.
主要方法:
- 描述NO-ferroheme物种在蛋白质之间转移和分成疏水性相的能力.
- 评估NO-ferroheme物种对可溶性酸环酶 (sGC) -cGMP-PKG通路的直接激活.
- 在孤立的血管和动物模型中评估NO-ferroheme物种的血管活性和低血压效应.
- 对NO-ferroheme物种的稳定性和活性与在食尸动物,红细胞和血的存在下自由的NO进行比较.
主要成果:
- 移动的NO-ferroheme物种可以有效地转化NO-like生物活性.
- 这些物种可以独立于自由的NO.激活sGC-cGMP-PKG通路.
- 没有铁的物种诱导血管扩张和低血压,NOS阻塞的效应被强化.
- 与自由的NO不同,NO-铁血肌蛋白在复杂的生物环境中保留了血管活性.
结论:
- NO-ferroheme物种在血管系统中作为移动信号实体起作用.
- 这些物种可以直接激活下游的信号通路,绕过自由的NO.
- 这些发现挑战了自由NO在NOS衍生的生物活性中的排他性作用,并突出了一个新的信号机制.
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