{"41455":{"#nid":"41455","#data":{"type":"news","title":"Gold Nanoparticles Show Anti-cancer Potential","body":[{"value":"\u003Cp\u003EResearchers from the University of California, San Francisco and Georgia Institute of Technology have found a new way to kill cancer cells. Building on their previous work that used gold nanoparticles to detect cancer, they now are heating the particles and using them as agents to destroy malignant cells.\u003C\/p\u003E\n\u003Cp\u003EThe researchers are a father and son, working together on opposite coasts. Their study findings are reported in the on-line edition of the journal Cancer Letters, found at Sciencedirect.com (quicksearch: El-Sayed nanoparticles).\n\u003C\/p\u003E\n\u003Cp\u003E\u0022In an earlier study we showed how gold nanoparticles could be bound to malignant cells, making cancer detection easier. Now we have examined how the particles\u0027 ability to absorb light helps kill those cancer cells,\u0022 said principal author Ivan El-Sayed, MD, assistant professor of otolaryngology at UCSF Medical Center.\n\u003C\/p\u003E\n\u003Cp\u003EIvan conducted the study with his father, Mostafa El-Sayed, PhD, director of the Laser Dynamics Laboratory and chemistry professor at Georgia Tech.\n\u003C\/p\u003E\n\u003Cp\u003EMany cancer cells have a protein, known as epidermal growth factor receptor (EGFR), all over their surface, while healthy cells typically do not express the protein as strongly. By conjugating, or binding, the gold nanoparticles to an antibody for EGFR, suitably named anti-EGFR, the researchers were able to get the nanoparticles to specifically attach themselves to the cancer cells.\n\u003C\/p\u003E\n\u003Cp\u003EIn the new study, the researchers incubated two oral squamous carcinoma cell lines and one benign epithelial cell line with anti-EFGR conjugated gold nanoparticles and then exposed them to continuous visible argon laser. \u0022The malignant cells required less than half the laser energy to be killed than the benign cells,\u0022 said Ivan. \u0022In addition, we observed no photothermal destruction of any type of cell in the absence of gold nanoparticles at these low laser powers.\u0022\n\u003C\/p\u003E\n\u003Cp\u003E\u0022We now have the potential to design an \u0027all in one\u0027 active agent that can be used to noninvasively find the cancer and then kill it,\u0022 Ivan said. \u0022This holds great promise for a number of types of cancer.\u0022\n\u003C\/p\u003E\n\u003Cp\u003E\u0022There is the real potential to design instrumentation to allow noninvasive detection and treatment of the particles in living humans,\u0022 Mostafa said. \u0022The particles can be used to create multiple designer agents targeted toward specific cancers. Much work still needs to be done, but at some point, we hope to be able to inject these compounds into patients with cancer in a search-and-destroy mission. Finding cancers not apparent to the eye will help physicians detect cancers earlier. Exposing the cells to the correct amount of light would then cause destruction of the cancer cells only and leave the healthy cells alone.\u0022\n\u003C\/p\u003E\n\u003Cp\u003EThe technique isn\u0027t toxic to human cells. \u0022Gold nanoparticles have been used in humans for 50 years,\u0022 Ivan said. \u0022For example, in the past, a radioactive form of colloidal gold has been used to search for cancerous lymph nodes.\u0022\n\u003C\/p\u003E\n\u003Cp\u003E\u0022Our technique is very simple and inexpensive-only a few cents worth of gold can yield results. We think it holds great promise to reduce the time, effort, and expense in cancer research, detection, and therapy in humans and under the microscope,\u0022 he added.\n\u003C\/p\u003E\n\u003Cp\u003EIvan, who sees many patients with oral cancers, hopes that in the not-too-distant future his research will pay off for his patients. \u0022Our best chance to save lives is to catch cancer and treat it early. Our work with gold nanoparticles may result in a valuable tool in fighting not only oral cancers, but also a number of other types, including stomach, colon and skin cancers.\u0022\n\u003C\/p\u003E\n\u003Cp\u003EThe research was supported by a grant from the Chemical Science, Geoscience and Biosciences Division of the U.S. Department of Energy.\u003C\/p\u003E\n\u003Cp\u003E\u003C\/p\u003E\n\u003Cp\u003E\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":[{"value":"Gold nanoparticles show potential for noninvasive cancer treatment"}],"field_summary":[{"value":"Researchers from the University of California, San Francisco and Georgia\nInstitute of Technology have found a new way to kill cancer cells. Building on their previous work that used gold nanoparticles to detect cancer, they now are heating the particles and using them as agents to destroy malignant cells.","format":"limited_html"}],"field_summary_sentence":[{"value":"Researchers see potential for new cancer treatment"}],"uid":"27304","created_gmt":"2005-10-10 00:00:00","changed_gmt":"2016-10-08 03:02:23","author":"Matthew Nagel","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2005-10-10T00:00:00-04:00","iso_date":"2005-10-10T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"41456":{"id":"41456","type":"image","title":"HOC Cancerous Cells","body":null,"created":"1449174312","gmt_created":"2015-12-03 20:25:12","changed":"1475894371","gmt_changed":"2016-10-08 02:39:31","alt":"HOC Cancerous Cells","file":{"fid":"190062","name":"tho10761.jpg","image_path":"\/sites\/default\/files\/images\/tho10761.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/tho10761.jpg","mime":"image\/jpeg","size":390303,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/tho10761.jpg?itok=7gFr_GNE"}}},"media_ids":["41456"],"groups":[{"id":"1214","name":"News Room"}],"categories":[{"id":"135","name":"Research"}],"keywords":[{"id":"2185","name":"gold"},{"id":"2973","name":"nanoparticles"},{"id":"107","name":"Nanotechnology"},{"id":"365","name":"Research"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Cstrong\u003EGeorgia Tech Media Relations\u003C\/strong\u003E\u003Cbr \/\u003ELaura Diamond\u003Cbr \/\u003E\u003Ca href=\u0022mailto:laura.diamond@comm.gatech.edu\u0022\u003Elaura.diamond@comm.gatech.edu\u003C\/a\u003E\u003Cbr \/\u003E404-894-6016\u003Cbr \/\u003EJason Maderer\u003Cbr \/\u003E\u003Ca href=\u0022mailto:maderer@gatech.edu\u0022\u003Emaderer@gatech.edu\u003C\/a\u003E\u003Cbr \/\u003E404-660-2926\u003C\/p\u003E","format":"limited_html"}],"email":["david.terraso@comm.gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}