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Characteristics of adenine nucleotide translocator in mitochondria of rat cerebral cortex during hypobaric hypoxia exposure
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- Author:
- No author available
- Journal Title:
- ACTA PHYSIOLOGICA SINICA
- Issue:
- 1
- DOI:
- 10.3321/j.issn:0371-0874.2006.01.005
- Key Word:
- 缺氧;线粒体;腺苷酸转运体
Abstract： 本文探讨低压缺氧对大鼠脑线粒体内膜腺苷酸转运体(adenine nucleotide translocator,ANT)转运特性的影响.实验将雄性Wistar大鼠随机分为常氧对照组和缺氧组,后者分别连续暴露于模拟5 000 m高原1、5、15、30 d(23 h/d).分别于平原和模拟4 000 m高原断头处死动物,分离脑线粒体,用抑制剂终止法测定线粒体对3H-ADP的转运效率,抑制剂滴定法测定ANT密度,HPLC测定线粒体内腺苷酸含量.结果显示:缺氧后ANT转运活性均明显低于常氧组,缺氧不同天数线粒体内膜ANT分布密度无显著改变,线粒体内(ATP+ADP)含量下降与转运活性变化一致.以上观察结果表明,低压缺氧暴露可显著抑制ANT转运活性,降低能量产生和利用的周转率,但不改变ANT密度,提示ANT活性改变是低压缺氧时细胞能量代谢障碍的重要机制.
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