2012年12月3日 訊 /生物谷BIOON/ --近日,刊登在國(guó)際雜志Nature Chemical Biology上的一篇研究報(bào)告指出,,研究者開(kāi)發(fā)出了一種斑馬魚(yú),,當(dāng)其肝臟產(chǎn)生葡萄糖的時(shí)候,其就會(huì)由半透明變成綠色,,這或許幫助研究者來(lái)鑒別調(diào)節(jié)整個(gè)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(yú)對(duì)2400種藥物進(jìn)行篩選測(cè)試,,這種研究測(cè)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(gè)體每天面對(duì)的一種狀態(tài),,即個(gè)體消化的食物緩慢經(jīng)過(guò)消化道的這一段時(shí)間,。禁食代謝也是個(gè)體在其飲食變?yōu)橹竞推渌蓛?chǔ)存來(lái)源之間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(jí)聯(lián)反應(yīng)的過(guò)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(lèi)物質(zhì)就會(huì)在肝臟中積累,,達(dá)到毒性水平。
因此,,研究者Gut和同事開(kāi)發(fā)出了斑馬魚(yú)篩選模型來(lái)篩選調(diào)節(jié)機(jī)體代謝的特殊藥物,,于此同時(shí),小鼠也可以用于測(cè)試所篩選出的化合物的藥效及毒性,,研究者對(duì)上千種藥物進(jìn)行了篩選,,發(fā)現(xiàn)兩種化合物可以開(kāi)啟一系列基因的表達(dá),這些基因可以引發(fā)動(dòng)物燃燒脂肪來(lái)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(lèi)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.