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Frequency-dependent changes in mitochondrial number and generation of reactive oxygen species in a rat model of vibration-induced injury.
Journal of Toxicology and Environmental Health, Part A ( IF 2.3 ) Pub Date : 2020-01-23 , DOI: 10.1080/15287394.2020.1718043
Kristine Krajnak 1
Affiliation  

Regular use of vibrating hand tools results in cold-induced vasoconstriction, finger blanching, and a reduction in tactile sensitivity and manual dexterity. Depending upon the length and frequency, vibration induces regeneration, or dysfunction and apoptosis, inflammation and an increase in reactive oxygen species (ROS) levels. These changes may be associated with mitochondria, this study examined the effects of vibration on total and functional mitochondria number. Male rats were exposed to restraint or tail vibration at 62.5, 125, or 250 Hz. The frequency-dependent effects of vibration on mitochondrial number and generation of oxidative stress were examined. After 10 days of exposure at 125 Hz, ventral tail arteries (VTA) were constricted and there was an increase in mitochondrial number and intensity of ROS staining. In the skin, the influence of vibration on arterioles displayed a similar but insignificant response in VTA. There was also a reduction in the number of small nerves with exposure to vibration at 250 Hz, and a reduction in mitochondrial number in nerves in restrained and all vibrated conditions. There was a significant rise in the size of the sensory receptors with vibration at 125 Hz, and an elevation in ROS levels. Based upon these results, mitochondria number and activity are affected by vibration, especially at frequencies at or near resonance. The influence of vibration on the vascular system may either be adaptive or maladaptive. However, the effects on cutaneous nerves might be a precursor to loss of innervation and sensory function noted in workers exposed to vibration.

中文翻译:

在振动诱发的大鼠模型中,线粒体数目的频率依赖性变化和活性氧的产生。

定期使用振动的手动工具会导致感冒引起的血管收缩,手指变​​白,并降低触觉敏感性和手动灵活性。取决于长度和频率,振动会导致再生,功能障碍和凋亡,炎症以及活性氧(ROS)水平升高。这些变化可能与线粒体有关,本研究研究了振动对线粒体总数和功能线数的影响。雄性大鼠受到62.5、125或250 Hz的束缚或尾巴振动。研究了振动对线粒体数目和氧化应激产生的频率依赖性影响。在125 Hz下暴露10天后,腹侧尾动脉(VTA)收缩,线粒体数目和ROS染色强度增加。在皮肤上 振动对小动脉的影响在VTA中显示出相似但无关紧要的反应。在受限和所有振动条件下,暴露于250 Hz振动下的小神经数量也减少了,线粒体数量也减少了。在125 Hz的振动下,感觉受体的大小显着增加,并且ROS水平升高。基于这些结果,线粒体数和活性受振动的影响,特别是在共振频率或接近共振的频率下。振动对血管系统的影响可能是适应性的或适应不良的。但是,对皮肤神经的影响可能是受到振动的工人注意到神经支配和感觉功能丧失的先兆。在受限和所有振动条件下,暴露于250 Hz振动下的小神经数量也减少了,线粒体数量也减少了。在125 Hz的振动下,感觉受体的大小显着增加,并且ROS水平升高。基于这些结果,线粒体的数量和活性受振动的影响,特别是在共振或接近共振的频率下。振动对血管系统的影响可能是适应性的或适应不良的。但是,对皮肤神经的影响可能是受到振动的工人注意到神经支配和感觉功能丧失的先兆。在受限和所有振动条件下,暴露于250 Hz振动下的小神经数量也减少了,线粒体数量也减少了。在125 Hz的振动下,感觉受体的大小显着增加,并且ROS水平升高。基于这些结果,线粒体数和活性受振动的影响,特别是在共振频率或接近共振的频率下。振动对血管系统的影响可能是适应性的或适应不良的。但是,对皮肤神经的影响可能是受到振动的工人注意到神经支配和感觉功能丧失的先兆。在受限和所有振动条件下,神经线粒体数量减少。在125 Hz的振动下,感觉受体的大小显着增加,并且ROS水平升高。基于这些结果,线粒体的数量和活性受振动的影响,特别是在共振或接近共振的频率下。振动对血管系统的影响可能是适应性的或适应不良的。但是,对皮肤神经的影响可能是受到振动的工人注意到神经支配和感觉功能丧失的先兆。在受限和所有振动条件下,神经线粒体数量减少。在125 Hz的振动下,感觉受体的大小显着增加,并且ROS水平升高。基于这些结果,线粒体数和活性受振动的影响,特别是在共振频率或接近共振的频率下。振动对血管系统的影响可能是适应性的或适应不良的。但是,对皮肤神经的影响可能是受到振动的工人注意到神经支配和感觉功能丧失的先兆。振动对血管系统的影响可能是适应性的或适应不良的。但是,对皮肤神经的影响可能是遭受振动的工人注意到神经支配和感觉功能丧失的先兆。振动对血管系统的影响可能是适应性的或适应不良的。但是,对皮肤神经的影响可能是受到振动的工人注意到神经支配和感觉功能丧失的先兆。
更新日期:2020-01-23
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