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Cell Metab:吃饭刺激人类棕色脂肪激活

2018-07-02 小通 生物通

来自芬兰Turku PET中心的研究人员最近在《Cell Metabolism》发文证明,吃饭也可以增加人类BAT耗氧量,效果等同于寒冷。


来自芬兰Turku PET中心的研究人员最近在《Cell Metabolism》发文证明,吃饭也可以增加人类BAT耗氧量,效果等同于寒冷。

过去十年,有关人类棕色脂肪组织(brown adipose tissue,BAT)的重要性已经变得越来越清晰了。正电子放射断层造影术(positron emission tomography,PET)显示,成人体内含有功能性BAT。尽管寒冷是BAT代谢功能激活的一个条件,但是在啮齿类动物实验中,已被证实进食也可起到激活BAT的作用。来自芬兰Turku PET中心的研究人员最近在《Cell Metabolism》发文证明,吃饭也可以增加人类BAT耗氧量,效果等同于寒冷。

大多数人都有意识地避免反复暴露在寒冷环境,因为寒冷会带给我们不舒服的感觉。研究显示,寒冷激活了我们锁骨以上颈部的BAT,增加了BAT的代谢功能,BAT功能活跃的人群相对具有更健康的新陈代谢,他们体内的葡萄糖和脂质比BAT不活跃的人浓度低。

在寒冷的环境下,身体需要生产更多热量保持体温,在日常生活中,我们发现吃饭有时也会让人满头大汗。BAT的主要功能之一是产热(thermogenesis)。动物实验已经证明,进食能刺激BAT产热,由于缺少直接测量工具,BAT在人类中的几个基本功能目前尚无定论。

餐后BAT耗氧量增加

长期从事人类代谢研究的Turku PET中心的研究人员利用非侵入性成像技术检测了人体BAT的耗氧量。健康的志愿者在摄取一份标准均衡膳食(包括蔬菜千层面、沙拉、面包、人造奶油和一杯牛奶)后,进行上胸部BAT PET扫描。另选一天,对志愿者进行寒冷条件下的PET扫描。

“我们发现,餐后的BAT耗氧量显著增加,就像暴露在寒冷中一样。这表明,进食刺激了BAT产热相关机制,”讲师Kirsi Virtanen说。

进食后,人体内立即启动一场激素“风暴”。促进营养物质、葡萄糖和脂肪酸氧化转移的胰岛素是最重要的激素信号之一。此外,科学家们发现,BAT中调节脂肪酸代谢的一些基因在进食后被开启了。

我们证明,吃饭可以激活BAT功能,Virtanen说,规律饮食对触发BAT产热和体重管理可能非常重要。

原始出处:

Mueez U Din,et al.Postprandial Oxidative Metabolism of Human Brown Fat Indicates Thermogenesis.Cell Metabolism..Published online: June 14, 2018

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    2018-12-16 guojianrong
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    2019-04-25 一闲
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    2018-09-04 维他命
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    2018-07-02 医者仁心5538

    学习了

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