2012年12月3日 訊 /生物谷BIOON/ --近日,,刊登在國際雜志Nature Chemical Biology上的一篇研究報告指出,,研究者開發(fā)出了一種斑馬魚,當(dāng)其肝臟產(chǎn)生葡萄糖的時候,,其就會由半透明變成綠色,,這或許幫助研究者來鑒別調(diào)節(jié)整個機(jī)體代謝的化合物,,或許也可以保護(hù)肥胖小鼠免于代謝性疾病的困擾。
研究者指出,,用斑馬魚對2400種藥物進(jìn)行篩選測試,,這種研究測試將幫助鑒別出機(jī)體禁食代謝中所涉及的關(guān)鍵調(diào)節(jié)子,禁食代謝是個體每天面對的一種狀態(tài),,即個體消化的食物緩慢經(jīng)過消化道的這一段時間,。禁食代謝也是個體在其飲食變?yōu)橹竞推渌蓛Υ鎭碓粗g所要完成能量獲取的一種方式。
禁食代謝涉及了許多不同組織基因相互平衡協(xié)調(diào)以及級聯(lián)反應(yīng)的過程,,在2型糖尿病及其它代謝疾病中,,這種細(xì)微的基因調(diào)節(jié)平衡是不存在的。因此機(jī)體并不能夠跟得上這種能量的崩潰,,因此脂類物質(zhì)就會在肝臟中積累,,達(dá)到毒性水平。
因此,,研究者Gut和同事開發(fā)出了斑馬魚篩選模型來篩選調(diào)節(jié)機(jī)體代謝的特殊藥物,,于此同時,小鼠也可以用于測試所篩選出的化合物的藥效及毒性,,研究者對上千種藥物進(jìn)行了篩選,,發(fā)現(xiàn)兩種化合物可以開啟一系列基因的表達(dá),這些基因可以引發(fā)動物燃燒脂肪來產(chǎn)生能量,。
后期研究中,,研究者將用小鼠進(jìn)行實(shí)驗(yàn),研究其中一種化合物是否可以保護(hù)肥胖小鼠免于代謝類疾病的發(fā)生,。相關(guān)研究由NIH等機(jī)構(gòu)提供資助,。(生物谷Bioon.com)
doi:10.1038/nchembio.1136
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Whole-organism screening for gluconeogenesis identifies activators of fasting metabolism
Philipp Gut,1, 2, 3, 4, 5 Bernat Baeza-Raja,6 Olov Andersson,1, 2, 3, 4, 5, 12 Laura Hasenkamp,1, 2, 3, 4, 5 Joseph Hsiao,1, 2, 3, 4, 5 Daniel Hesselson,1, 2, 3, 4, 5, 12 Katerina Akassoglou,6 Eric Verdin,7, 8 Matthew D Hirschey7, 8, 9, 10, 11 & Didier Y R Stainier1, 2, 3, 4, 5, 12
Improving the control of energy homeostasis can lower cardiovascular risk in metabolically compromised individuals. To identify new regulators of whole-body energy control, we conducted a high-throughput screen in transgenic reporter zebrafish for small molecules that modulate the expression of the fasting-inducible gluconeogenic gene pck1. We show that this in vivo strategy identified several drugs that affect gluconeogenesis in humans as well as metabolically uncharacterized compounds. Most notably, we find that the translocator protein ligands PK 11195 and Ro5-4864 are glucose-lowering agents despite a strong inductive effect on pck1 expression. We show that these drugs are activators of a fasting-like energy state and, notably, that they protect high-fat diet–induced obese mice from hepatosteatosis and glucose intolerance, two pathological manifestations of metabolic dysregulation. Thus, using a whole-organism screening strategy, this study has identified new small-molecule activators of fasting metabolism.