eLife:抑制食欲、增加饱腹感,这种激素让减肥不再是梦

2020-11-29 医诺维 生物探索

肥胖症已在世界范围内达到流行病的程度,并影响了40%以上的美国成年人。肥胖者更有可能患上2型糖尿病、心血管疾病或慢性肾脏疾病。很难靠饮食和运动来减轻体重,而极少数人能坚持下来。

肥胖症已在世界范围内达到流行病的程度,并影响了40%以上的美国成年人。肥胖者更有可能患上2型糖尿病血管疾病或慢性肾脏疾病。很难靠饮食和运动来减轻体重,而极少数人能坚持下来。在中国,超重和肥胖人群已逾3亿人,减肥瘦身已成为人们茶余饭后的热门话题。

2020年11月24日,哥伦比亚大学的科学家在" eLife "期刊上在线发表了题为"Lipocalin-2 is an anorexigenic signal in primates"的研究论文,该研究发现成骨细胞源激素Lipocalin-2(LCN2),可以抑制食物摄入并增加小鼠饱腹感,并且在人类和非人类灵长类动物中也显示出相似的结果。

LCN2主要由骨细胞产生,并在小鼠和人类中自然发现。小鼠研究表明,长期给动物LCN2会减少食物摄入并防止体重增加,而不会导致其新陈代谢减慢。

LCN2充当饭后饱食的信号,导致小鼠限制食物的摄入量,并且通过作用于大脑的下丘脑来做到这一点。

研究人员想知道LCN2对人类是否有类似的作用,以及一剂量是否能穿越血脑屏障。

该团队首先分析了来自美国和欧洲的四项不同研究的数据,这些研究是体重正常,超重或患有肥胖症的人。每个研究中的人都在禁食过夜后进餐,并研究了进餐前后血液中LCN2的量。

研究人员发现,那些体重正常的人饭后LCN2含量增加,这与他们进食后感到满意的程度相吻合。相反,在超重或肥胖的人中,餐后LCN2水平下降。

在rh-LCN2治疗后,vervet猴的体重、瘦素和甘油三酯有下降的趋势

基于这种餐后反应,研究人员将人们分为无反应者或反应者。餐后LCN2没有增加的无反应者,其腰围较大,且代谢疾病的标志物较高,包括BMI,体脂,血压升高和血糖升高。

然而,值得注意的是,发现在胃旁路手术后体重减轻的人对LCN2的敏感性得以恢复,从手术前的无反应者变为手术后的反应者。

两者合计,这些结果反映了在小鼠中观察到的结果,并表明这种餐后LCN2调节的丧失是导致肥胖的新机制,并且可能成为减肥治疗的潜在目标。

在证实LCN2可以穿透大脑后,研究小组探索了用激素治疗是否会减少食物摄入并防止体重增加。为此,他们用LCN2处理猴子一周,与一周之内进行治疗之前相比,他们的食物摄入量减少了28%,并且猴子的食量也比仅接受盐水治疗的猴子少了21%。仅在治疗一周后,对体重,体脂和血脂水平的测量显示,在治疗的动物中下降的趋势。

LCN2与人、狒狒和恒河猴脑段的下丘脑结合

研究表明,LCN2可以穿过大脑,进入下丘脑并抑制非人类灵长类动物的食物摄入,该激素可以抑制食欲,而毒性可忽略不计,为进一步提高LCN2临床应用水平奠定了基础。

原始出处:

Peristera-Ioanna Petropoulou, Ioanna Mosialou, Steven Shikhel, et al.Lipocalin-2 is an anorexigenic signal in primates.Elife. 2020 Nov 24;9:e58949. doi: 10.7554/eLife.58949.

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    2020-12-17 膀胱癌
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    2021-08-18 clmlylxy
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    2020-11-30 志在四方

    成骨细胞源激素研究是医学的新突破

    0

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    2020-11-30 Jessie Zhang

    LCN2可以穿过大脑,进入下丘脑并抑制非人类灵长类动物的食物摄入,该激素可以抑制食欲,而毒性可忽略不计,为进一步提高LCN2临床应用水平奠定了基础

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    2020-11-29 CHANGE

    什么时候有懒人用的减肥神药?

    0

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