Altered daily rhythms of brain and pituitary indolamines and neuropeptides in long-term hypoxic rats.

Altered daily rhythms of brain and pituitary indolamines and neuropeptides in long-term hypoxic rats.
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改变长期缺氧大鼠的大脑和垂体吲哚胺和神经肽的每日节律。

DOI:
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发表时间:
1999
影响因子:
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通讯作者:
L. Denoroy
L. Denoroy
中科院分区:
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文献类型:
--
作者:
L. Poncet;J. Pequignot;J. Cottet;Y. Dalmaz;L. Denoroy

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为了确定持续缺氧是否会改变大脑和垂体神经递质的日常节律,我们测定了缺氧(10% O)时,分散脑区、松果体和垂体前叶血管活性肠肽样免疫反应性(VIP-LI)、神经肽y样免疫反应性(NPY-LI)、血清素(5-HT)和5-羟基吲哚-3-乙酸(5-HIAA)含量的日常变化;14 d)和常温大鼠。缺氧抑制视交叉上核(SCN)和垂体前叶VIP-LI的日变化,增强延髓后内侧尾部(DMMc) 5 -羟色胺能成分的日节律性,甚至诱导DMMc和延髓腹外侧NPY-LI的日变化。此外,缺氧大鼠松果体中5-HT和5-HIAA的节律性以及血浆皮质酮的节律性也发生了准时改变。因此,本研究的结果表明,永久性的非光刺激,如持续缺氧,可能会影响位于SCN的内部时钟的功能,并可能改变一些脑核和垂体的神经递质含量的日常节律性。
To determine whether sustained hypoxia alters daily rhythms in brain and pituitary neurotransmitters, the daily variations in vasoactive intestinal peptide-like immunoreactivity (VIP-LI), neuropeptide Y-like immunoreactivity (NPY-LI), serotonin (5-HT), and 5-hydroxyindole-3-acetic acid (5-HIAA) content were determined in discrete brain regions, pineal gland and anterior pituitary of hypoxic (10% O(2); 14 days) and normoxic rats. Hypoxia suppressed daily variations in VIP-LI in the suprachiasmatic nuclei (SCN) and the anterior pituitary, enhanced the daily rhythmicity in serotonergic elements of the caudal part of the dorsomedial medulla oblongata (DMMc), and even induced daily variations in NPY-LI in the DMMc as well as in the ventrolateral medulla oblongata. In addition, punctual alterations in the rhythmicity of 5-HT and 5-HIAA in the pineal gland and of plasma corticosterone were observed in hypoxic rats. Thus results of this study indicate that a permanent nonphotic stimulus, such as sustained hypoxia, may affect the functioning of the internal clock located in the SCN and may alter the daily rhythmicity in neurotransmitter content of some brain nuclei and the pituitary gland.
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