{"id":2515,"date":"2014-11-20T00:00:00","date_gmt":"2014-11-20T08:00:00","guid":{"rendered":"https:\/\/vermont.salk.edu\/news-release\/salk-scientists-unveil-powerful-method-to-speed-cancer-drug-discovery\/"},"modified":"2014-11-20T00:00:00","modified_gmt":"2014-11-20T08:00:00","slug":"salk-scientists-unveil-powerful-method-to-speed-cancer-drug-discovery","status":"publish","type":"disclosure","link":"https:\/\/www.salk.edu\/zh\/news-release\/salk-scientists-unveil-powerful-method-to-speed-cancer-drug-discovery\/","title":{"rendered":"Salk scientists unveil powerful method to speed cancer drug discovery"},"content":{"rendered":"<p><p>LA JOLLA\u2013For decades, researchers have struggled to translate basic scientific discoveries about <a href=\"https:\/\/www.salk.edu\/zh\/ra\/cancer.html\/\">\u764c\u75c7<\/a> into therapeutics that effectively\u2013and with minimal side effects\u2013shrink a tumor. <\/p>\n<p>\nOne avenue that may hold great potential is the development of drugs that interfere with interactions between proteins, which are often disrupted during the formation and spread of cancer. Deciphering these interactions, however, has proven difficult and time consuming, leading to doubts about the practicality of this approach as a route to new therapies.<\/p>\n<p><iframe src=\"\/\/www.youtube.com\/embed\/i16cjeyphFc\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>\nNow, Salk scientists have developed a highly sensitive, new method that enables them to detect fleeting protein interactions that play critical roles in the development of many diseases including cancer. The approach, published November 20 in <a target=\"_blank\" href=\"http:\/\/www.cell.com\/cell-reports\/abstract\/S2211-1247(14)00927-9 \"><em>Cell Reports<\/em><\/a>, could dramatically accelerate the identification of many potential new drug targets and provide an immediate platform to screen for badly needed new drug candidates that disrupt abnormal protein interactions. <\/p>\n<p>\n\t\u201cThe number of protein functions that are currently targeted by drugs is incredibly small compared to the total number of protein interactions that could be targeted for therapeutic benefit,\u201d says <a href=\"https:\/\/www.salk.edu\/zh\/faculty\/wahl.html\/\">Geoffrey Wahl<\/a>, a professor in Salk\u2019s <a href=\"https:\/\/www.salk.edu\/zh\/faculty\/gene_expression_laboratory.html\/\">\u57fa\u56e0\u8868\u8fbe\u5b9e\u9a8c\u5ba4<\/a>. \u201cIf we can crack the nut of screening for drugs that disrupt cancer-relevant protein interactions, this will be an enormous breakthrough and could have implications for many other fields as well.\u201d<\/p>\n<p>\n\t Yao-Cheng Li, a staff scientist in Wahl\u2019s lab and first author of the new paper, explains that their method focuses on one of the two kinds of protein-protein interactions. \u201cOne type generates very stable protein complexes that remain together,\u201d he says. \u201cBut many other proteins display a touch-and-go kind of interaction\u2013they bind, then fall apart. It\u2019s these latter interactions that have been the most difficult to detect.\u201d <\/p>\n<p>\nTo help visualize these brief, transient interactions, Li and Wahl turned to a molecule called luciferase, an enzyme that generates bioluminescence of the sort used by fireflies to make their bodies glow. The scientists adapted an old method in which luciferase is split in half to make two non-functional fragments. The scientists attached each half of the luciferase to two proteins of interest so that if the proteins associate for any period of time, luciferase\u2019s two halves are brought together and emit light. The secret to the new method comes in the many tweaks and improvements that Li added to the system, which is symbolized by the acronym he and Wahl apply to the method\u2013ReBiL\u2013which indicates \u201crecombinase enhanced bi-molecular luciferase complementation.\u201d <\/p>\n<div class=\"imageCaption530\"><img decoding=\"async\" alt=\"\" src=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2014\/01\/2059.jpg\"><\/p>\n<p>\nSalk researcher Yao-Cheng Li and professor Geoffrey Wahl<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/www.salk.edu\/wp-content\/uploads\/2015\/02\/2059.jpg\">Click here<\/a> for a high-resolution image.<\/p>\n<p>\nImage: Courtesy of the Salk Institute for Biological Studies\n<\/p>\n<\/div>\n<p>\n \u201cIt works like a bulb and a lamp,\u201d says Wahl, who is also the holder of Salk&#8217;s Daniel and Martina Lewis Chair. \u201cNeither one lights up without the other. The ReBiL method provides a very fast and easy way of seeing whether the bulb will fit into the lamp socket.\u201d<\/p>\n<p>\nTo test the method, Wahl and Li applied it to the interaction between two proteins, Ube2t and FANCL, that\u2019s been notoriously hard to observe and had never been seen in living mammalian cells. These proteins are important because they are involved in the cell\u2019s ability to detect and repair DNA damage, a function that is often disrupted in diseases.  Mutations in FANCL, for instance, cause rare blood disorders and dispose people to cancer. The ability of ReBiL to reveal the stealthy FANCL-Ube2t reaction suggested the method could be a powerful technique for observing other similarly challenging interactions.<\/p>\n<p>\nThe Salk scientists then used ReBiL to study a promising target for cancer, the interaction between the proteins p53 and Mdm2. The function of p53 is affected in almost all cancers and, in many cancers, too much Mdm2 prevents p53 from functioning properly.  Hence, a major goal of cancer scientists has been to develop drugs that prevent Mdm2 from binding to p53, and to thereby activate p53 to kill the tumor cell. <\/p>\n<p>\nWahl, Li and their colleagues used ReBiL to confirm that some drugs work as expected to prevent Mdm2 from binding to p53. On the other hand, when they applied their method to a new class of promising drugs called stapled peptides, they found that the drugs had difficulty entering cells and had the unexpected and unintended ability to kill cells by punching holes in their protective covering (the membrane). Despite spending millions of dollars to develop these drugs, this dangerous side effect was not observed because previous methods did not reveal it. ReBiL provides a fast and simple way to try to improve stapled peptides to enable them to get into the cell, bind to their targets and kill cells by the specific route they were designed to use. <\/p>\n<p>\nThe fact that ReBiL can be used to study living cells (as opposed to many older methods that use isolated proteins from cells to determine their interactions) makes it an ideal way to observe these unexpected side effects and to modify the drugs to eliminate them, Wahl says. <\/p>\n<p>\n\u201cWe think the method is already so good and so versatile that we\u2019re already applying it to many different questions,\u201d Wahl says. \u201cIt has applications from understanding many growth regulatory pathways and for understanding critical processes that should lead to the identification of the targets needed for the development of new therapies. Not unexpectedly, academics in many fields as well as companies have already shown interest.\u201d<\/p>\n<p>\nWahl and Li imagine ReBiL being used in the future to discover new interactions between proteins that might serve as cancer drug targets, as well as being used in robotic systems to identify drugs that disrupt protein interactions. They also foresee using the technology to help avoid the off-target effects they have already identified for stapled peptides. <\/p>\n<p>\n<a href=\"https:\/\/www.salk.edu\/zh\/faculty\/saghatelian.html\/\">Alan Saghatelian<\/a>, a professor in Salk\u2019s <a href=\"https:\/\/www.salk.edu\/zh\/faculty\/clayton_foundation_laboratories_for_peptide_biology.html\/\">\u514b\u83b1\u987f\u57fa\u91d1\u4f1a\u80bd\u751f\u7269\u5b66\u5b9e\u9a8c\u5ba4<\/a>, says ReBil is an important new technological platform for scientists. \u201cThis will have a powerful impact on the development of new medicines and the discovery of novel biological mechanisms,\u201d says Saghatelian, who was not involved in the study. \u201cThe results demonstrate the value of this approach in prioritizing drug candidates and understanding mechanisms of drug action.\u201d\n<\/p>\n<p>\n\tOther researchers on the study were Luo Wei Rodewald, Christian Hoppmann, Ee Tsin Wong and Lei Wang of the Salk Institute for Biological Studies; and Sylvain Lebreton, Pavel Safar, Marcel Patek, and Kenneth Wertman of Sanofi Tucson Innovation Center.  <\/p>\n<p>\n\tThe work was supported by grants from the <a href=\"http:\/\/nih.gov\" target=\"_blank\">National Institutes of Health<\/a>, a Cancer Center Support Grant, a Salk Innovation Grant, a Sanofi-sponsored research grant, and the <a href=\"http:\/\/helmsleytrust.org\/\" target=\"_blank\">Leona M. and Harry B. Helmsley Charitable Trust<\/a>.\n<\/p>\n<p>\n<strong>About the Salk Institute for Biological Studies:<\/strong><br \/>\nThe Salk Institute for Biological Studies is one of the world&#8217;s preeminent basic research institutions, where internationally renowned faculty probes fundamental life science questions in a unique, collaborative and creative environment. Focused both on discovery and on mentoring future generations of researchers, Salk scientists make groundbreaking contributions to our understanding of cancer, aging, Alzheimer&#8217;s, diabetes and infectious diseases by studying neuroscience, genetics, cell and plant biology and related disciplines. <\/p>\n<p>Faculty achievements have been recognized with numerous honors, including Nobel Prizes and memberships in the National Academy of Sciences. Founded in 1960 by polio vaccine pioneer Jonas Salk, MD, the Institute is an independent nonprofit organization and architectural landmark.<\/p>","protected":false},"featured_media":0,"template":"","faculty":[90],"disease-research":[46],"class_list":["post-2515","disclosure","type-disclosure","status-publish","hentry","faculty-geoffrey-wahl","disease-research-cancer-biology"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Salk scientists unveil powerful method to speed cancer drug discovery - Salk Institute for Biological Studies<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.salk.edu\/zh\/news-release\/salk-scientists-unveil-powerful-method-to-speed-cancer-drug-discovery\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Salk scientists unveil powerful method to speed cancer drug discovery - 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