2016年3月2日讯 /生物谷BIOON/ –我们到底为什么会变胖?而减肥为什么会这么困难?
最近来自德国的科学家们发现了一个调节体重和摄食的新分子,他们发现组蛋白去乙酰化酶5(HDAC5)对瘦素(leptin)信号途径具有显著影响,而leptin在调节饱腹感以及机体应对食物的适应性变化方面具有关键作用。
文章作者这样表示:“HDAC5是脂肪组织与脑部食欲调节区域之间交流的重要联系。”初步试验已经表明下丘脑部位HDAC5的蛋白合成及活性会受到高脂饮食刺激而出现增加,高脂饮食会导致脂肪堆积同时调节饱腹感的激素leptin也会增加。HDAC5就像位于脑部的一个分子开关帮助机体辨别脂肪组织到底已经“塞”得有多满。如果没有HDAC5,机体就对无法对进食进行适应性调节也无法控制脂肪堆积。
该信号途径紊乱会导致肥胖发生。
这项研究表明,不能合成HDAC5的小鼠对leptin的应答情况也会显著下降——这种情况也叫做leptin抵抗。研究人员发现这种小鼠会持续进食,与对照小鼠相比,缺少HDAC5的小鼠更易发生肥胖。靶向激活HDAC5则会逆转这种情况,这种方法能够帮助肥胖小鼠减少脂肪减轻体重。
文章作者指出,重建leptin的敏感性是维持体重下降,拮抗肥胖并发症如2型糖尿病的重要一步,除了饮食和运动的改变,对leptin信号途径具有调节作用的各个分子或在将来成为药物靶点,推动减肥事业的进行,而他们发现的HDAC5就是其中的一个重要分子。但他们仍然表示未来还需要许多研究进一步探讨该分子是否适合成为人类肥胖治疗的药物靶点。(基因宝jiyinbao.com)
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Hypothalamic leptin action is mediated by histone deacetylase 5
Dhiraj G. Kabra, Katrin Pfuhlmann, Cristina García-Cáceres, Sonja C. Schriever, Veronica Casquero García, Adam Fiseha Kebede, Esther Fuente-Martin, Chitrang Trivedi, Kristy Heppner, N. Henriette Uhlenhaut, Beata Legutko, Uma D. Kabra, Yuanqing Gao, Chun-Xia Yi, Carmelo Quarta, Christoffer Clemmensen, Brian Finan, Timo D. Müller, Carola W. Meyer, Marcelo Paez-Pereda, Kerstin Stemmer, Stephen C. Woods, Diego Perez-Tilve, Robert Schneider, Eric N. Olson, Matthias H. Tschöp & Paul T. Pfluger
Hypothalamic leptin signalling has a key role in food intake and energy-balance control and is often impaired in obese individuals. Here we identify histone deacetylase 5 (HDAC5) as a regulator of leptin signalling and organismal energy balance. Global HDAC5 KO mice have increased food intake and greater diet-induced obesity when fed high-fat diet. Pharmacological and genetic inhibition of HDAC5 activity in the mediobasal hypothalamus increases food intake and modulates pathways implicated in leptin signalling. We show HDAC5 directly regulates STAT3 localization and transcriptional activity via reciprocal STAT3 deacetylation at Lys685 and phosphorylation at Tyr705. In vivo, leptin sensitivity is substantially impaired in HDAC5 loss-of-function mice. Hypothalamic HDAC5 overexpression improves leptin action and partially protects against HFD-induced leptin resistance and obesity. Overall, our data suggest that hypothalamic HDAC5 activity is a regulator of leptin signalling that adapts food intake and body weight to our dietary environment.