Regulation of ionic conductances and gene expression by hypoxia in an oxygen sensitive cell line.

Regulation of ionic conductances and gene expression by hypoxia in an oxygen sensitive cell line.
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氧敏感细胞系中缺氧对离子电导和基因表达的调节。

DOI:
10.1007/978-1-4615-5891-0_20
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发表时间:
1996
影响因子:
--
通讯作者:
Genter,MB
Genter,MB
中科院分区:
医学4区
文献类型:
--
作者:
Millhorn,DE;Conforti,L;Beitner-Johnson,D;Zhu,W;Raymond,R;Filisko,T;Kobayashi,S;Peng,M;Genter,MB

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氧是线粒体呼吸链合成ATP过程中电子的最终受体,因此是大多数生物系统中能量转化的必需底物。氧张力的降低严重限制了细胞执行能量依赖性功能的能力,如果缺氧足够严重,可能会危及生命。因此,在大多数物种中进化出一个精心设计的控制系统来优化O2向细胞的输送也就不足为奇了。在哺乳动物中,该系统的一个重要组成部分是颈动脉体;一个位于颈动脉分叉处的小器官。颈动脉体包含O2敏感(I型)细胞,它们受到O2张力降低的刺激。I型细胞通过释放神经递质将有关动脉血氧状态的信息传递到邻近的初级感觉传入纤维。当代生物学面临的一个主要问题是识别将环境刺激与细胞表型和功能变化耦合的分子和细胞机制。然而,经过几十年的深入研究,I型细胞检测O2张力变化并将此信号转化为神经递质合成和释放增加的机制仍然未知。
Oxygen is the final acceptor of electrons in the synthesis of ATP by the mitochondrial respiratory chain and is therefore an obligatory substrate for energy transformation in most biological systems. A reduction in O2tension severely limits the ability of cells to perform energy-dependent functions and, if the hypoxia is severe enough, it can be life threatening. It is therefore not surprising that an elaborate control system has evolved in most species for optimizing the delivery of O2to cells. In mammals, an essential component of this system is the carotid body; a small organ that is located bilaterally at the bifurcation of the carotid artery. The carotid body contains O2-sensitive (type I) cells that are stimulated by reduced O2tension. The type I cells transmit information concerning the O2status of arterial blood to closely situated primary sensory afferent fibers by release of neurotransmitter. A major problem confronting contemporary biology is identification of the molecular and cellular mechanisms that couple environmental stimuli with changes in cell phenotype and function. However, after several decades of intense investigations, the mechanisms by which type I cells detect changes in O2tension and transduce this signal into an increase in neurotransmitter synthesis and release remain unknown.
缺氧期间 PC-12 细胞的膜去极化受到 O2 敏感 K 电流的调节。
DOI: 10.1152/ajpcell.1996.271.2.c658
发表时间: 1996
期刊: The American journal of physiology
影响因子: --
作者:
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DOI: --
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缺氧刺激细胞质蛋白与大鼠酪氨酸羟化酶 mRNA 3-非翻译区富含嘧啶的序列结合。
DOI: --
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DOI: --
发表时间: 1994
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DOI: 10.1111/j.1471-4159.1979.tb05216.x
发表时间: 1979
影响因子: 4.7
作者:
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通讯作者: S. Fidone