Diabetologia :夜间照明对大鼠糖耐量的损害具有光照时间、强度和波长依赖性

2017-04-16 MedSci MedSci原创

电气照明在世界范围内已被广泛使用,但是一周7天一天24小时的暴露在光照中对健康的影响最近才开始受到关注。

近几十年来,夜间照明技术迅猛发展。动物研究表明,长期昏暗的夜间照明会诱导肥胖和葡萄糖耐受不良的发生。此外,已有人类研究证实:长期暴露在夜间的人造光线中会对人体健康产生危害,可增加包括2型糖尿病在内的代谢性疾病的发病风险。众所周知,短时间暴露在夜间光照中可影响机体生物钟的功能、激素的分泌以及自主神经系统的活动。但是,夜间光照对葡萄糖稳态有何影响?目前尚无研究报道。

近日,糖尿病领域权威杂志Diabetologia上发表了一项动物研究,研究人员探讨了夜间光照对葡萄糖稳态的影响。

该研究以雄性大鼠作为研究对象,在夜间早期或晚期暴露于人造光线中2小时后进行静脉葡萄糖耐量或胰岛素耐量实验。此外,还采用了不同的光照强度和波长进行实验。

此项研究结果显示:暴露在夜间早期照明环境中的大鼠,在葡萄糖注射后的前20分钟内葡萄糖反应显著增加(p<0.001)。而暴露在夜间晚期照明环境中的大鼠,在前10分钟胰岛素反应显著增加(p<0.01)。这表明,夜间照明会迅速引起大鼠葡萄糖耐受不良。此外,研究人员采用不同的光照强度和波长进行实验后发现:夜间光照对大鼠的影响具有光照强度和波长依赖性。他们发现,和5-20勒克斯的光照度相比,50-150勒克斯的光照度会引起更大的葡萄糖反应。除了5勒克斯光照度,所有的光照强度均会减少大鼠的自主活动。绿光会影响葡萄糖耐受不良,而红光和蓝光却不会。这表明存在特定的视网膜大脑通路参与这一反应。
 
综上,该研究表明:夜间照明对葡萄糖代谢的损害呈光照时间、强度和波长依赖性。

原始出处:
Anne-Loes Opperhuizen, Dirk J. Stenvers, Remi D. Jansen et al.Light at night acutely impairs glucose tolerance in a time-, intensity- and wavelength-dependent manner in rats.Diabetologia, 03 April 2017. DOI: 10.1007/s00125-017-4262-y

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    2017-04-18 fengxx
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    2017-04-18 TZF0807
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    2017-04-18 绛珠草小姐

    学习了,谢谢分享

    0

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