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首页> 外文期刊>Biology Bulletin >Structure of Mitochondria and Activity of Their Respiratory Chain in Successive Generations of Yeast Cells Exposed to He-Ne Laser Light
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Structure of Mitochondria and Activity of Their Respiratory Chain in Successive Generations of Yeast Cells Exposed to He-Ne Laser Light

机译:He-Ne激光照射下酵母细胞连续世代中的线粒体结构及其呼吸链活性

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摘要

The data on the aftereffect of He-Ne laser light (λ = 632.8 nm) on mitochondria of yeasts in late log phase were reviewed. The quantitative analysis of the ultrathin cell sections demonstrated a nonuniform thickness of the giant branched mitochondria typical for budding yeasts. Exposure to a dose of 460 J/m~2 (accel-erating cell proliferation and activating respiratory chain enzymes, cytochrome c oxidase and NADH dehydro-genase), changed the macrostructure of the giant mitochondria—much of the narrow regions of the mitochon-drial tube with profiles ≤0.06 μm~2 were expanded (while no signs of organelle damage were observed). Such mitochondria are characterized by increased relative surface area of the cristae, which can be due to the activa-tion of their respiration and ATP synthesis. The number of associations between mitochondria and endoplasmic reticulum increased in irradiated cells in early log phase, which reflects the increased capacity of mitochondria to uptake Ca~(2+). Altered giant mitochondria configuration can increase the efficiency of both energy transfer and Ca~(2+) propagation through the cytoplasm.
机译:回顾了He-Ne激光(λ= 632.8 nm)对数对数后期酵母对线粒体的后效应数据。超薄细胞切片的定量分析表明,发芽酵母典型的巨大分支线粒体厚度不均匀。暴露于460 J / m〜2的剂量(促进细胞增殖和激活呼吸链酶,细胞色素C氧化酶和NADH脱氢酶),改变了巨大的线粒体的宏观结构-线粒体的大部分狭窄区域轮廓≤0.06μm〜2的肾小管扩张(没有观察到细胞器损伤的迹象)。此类线粒体的特征在于the的相对表面积增加,这可能是由于其呼吸作用和ATP合成的激活所致。对数期早期,受辐照细胞线粒体与内质网的缔合数目增加,反映了线粒体吸收Ca〜(2+)的能力增强。改变的巨大线粒体构型可以增加能量转移和Ca〜(2+)通过细胞质传播的效率。

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  • 来源
    《Biology Bulletin》 |2005年第6期|p.556-566|共11页
  • 作者

    V. M. Manteifel; T. I. Karu;

  • 作者单位

    Institute for Laser and Information Technologies, Russian Academy of Sciences, Troitsk, Moscow oblast, 142190 Russia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物科学;
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