Hemoglobin α in the blood vessel wall.

Hemoglobin α in the blood vessel wall.
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DOI:
10.1016/j.freeradbiomed.2014.04.019
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发表时间:
2014-08
影响因子:
7.4
通讯作者:
Isakson, Brant E.
Isakson, Brant E.
中科院分区:
医学1区
文献类型:
--
作者:
Butcher, Joshua T.;Johnson, Tyler;Beers, Jody;Columbus, Linda;Isakson, Brant E.

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血红蛋白已经被研究了一百多年,并在红细胞中得到了很好的表征。然而,新的研究表明,血红蛋白α亚基(Hbα)也存在于血管壁内,它似乎定位于肌内皮连接处(MEJ),并在调节内皮和平滑肌之间的一氧化氮(NO)信号传导中发挥作用。这一发现为控制内皮一氧化氮合酶活性、一氧化氮扩散以及最终控制血管张力和血压创造了新的范例。本文将讨论血红蛋白作为血液中气体交换分子的特性,并将Hbα生物学特性推断为MEJ信号域。具体来说,我们认为Hbα存在于MEJ中,以调节NO在有限物理空间中的释放和扩散,这将对外周阻力动脉的血流调节具有重要意义。
Hemoglobin has been studied and well haracterized in red blood cells for over one hundred years. However, new work has indicated that the hemoglobin alpha subunit (Hbα) is also found within the blood vessel wall, where it appears to localize at the myoendothelial junction (MEJ) and plays a role in regulating nitric oxide (NO) signaling between endothelium and smooth muscle. This discovery has created a new paradigm for control of endothelial nitric oxide synthase activity, nitric oxide diffusion, and ultimately, control of vascular tone and blood pressure. This review will discuss the current knowledge of hemoglobin’s properties as a gas exchange molecule in the blood stream, and extrapolate the properties of Hbα biology to the MEJ signaling domain. Specifically, we propose that Hbα is present at the MEJ to regulate NO release and diffusion in a restricted physical space, which would have powerful implications for the regulation of blood flow in peripheral resistance arteries.
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