Mechanisms and physiological function of daily haemoglobin oxidation rhythms in red blood cells

Mechanisms and physiological function of daily haemoglobin oxidation rhythms in red blood cells
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红细胞日常血红蛋白氧化节律的机制和生理功能

DOI:
10.1101/2021.10.11.463714
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发表时间:
2021
期刊:
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影响因子:
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通讯作者:
Beale A
Beale A
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作者:
Beale A

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细胞昼夜节律赋予生理学时间组织,这是人类健康的基础。节律存在于红细胞(RBC)中,红细胞是体内最丰富的细胞类型,但其生理功能知之甚少。在这里,我们提出了一种新的血红蛋白(Hb)氧化状态的生化测定方法,该方法依赖于SDS介导的细胞裂解过程中形成的氧化还原敏感性共价血红素-Hb键。当亚铁血红蛋白以高铁血红蛋白的形式被氧化时,这种连接的形成最低。在体外培养的小鼠和人的红细胞中,或从人体内提取的红细胞中观察到每日血红蛋白氧化节律,并且不受影响有核细胞昼夜节律的突变的影响。这些节律与核心体温的每日节律相关,当metHb水平最高时温度最低。通过膳食亚硝酸钠提高高铁血红蛋白水平可以通过一氧化氮(NO)信号传导进一步降低小鼠白天的核心体温。这些结果扩展了我们对RBC昼夜节律的分子理解,并表明它们有助于调节体温。
Cellular circadian rhythms confer temporal organisation upon physiology that is fundamental to human health. Rhythms are present in red blood cells (RBCs), the most abundant cell type in the body, but their physiological function is poorly understood. Here, we present a novel biochemical assay for haemoglobin (Hb) oxidation status which relies on a redox‐sensitive covalent haem‐Hb linkage that forms during SDS‐mediated cell lysis. Formation of this linkage is lowest when ferrous Hb is oxidised, in the form of ferric metHb. Daily haemoglobin oxidation rhythms are observed in mouse and human RBCs culturedin vitro, or taken from humansin vivo, and are unaffected by mutations that affect circadian rhythms in nucleated cells. These rhythms correlate with daily rhythms in core body temperature, with temperature lowest when metHb levels are highest. Raising metHb levels with dietary sodium nitrite can further decrease daytime core body temperature in mice via nitric oxide (NO) signalling. These results extend our molecular understanding of RBC circadian rhythms and suggest they contribute to the regulation of body temperature.
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发表时间: 2020-05
期刊: bioRxiv
影响因子: --
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DOI: 10.1007/978-1-59745-198-7_166
发表时间: 2009
期刊: The Biochemical journal
影响因子: --
作者:
Katherine H. Pedone;L. Bernstein;M. Linder;J. Hepler
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DOI: --
发表时间: 1964
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