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Cancer-Detecting Nanoparticles Developed for MR Imaging

By MedImaging staff writers
Posted on 18 Jun 2008
Magnetic resonance imaging (MRI) can be an excellent tool for detecting a tumor in the body without resorting to surgery. Now, a team of researchers has created the smallest magnetic nanoparticles to date that can be utilized on such seek-and-find missions. With a thinner coating, the particles also emit a stronger signal for the MRI to detect.

MRI scans use pulses of magnetic waves, and gauge the return signals to identify different types of tissue in the body, such as telling bone from muscle, or fluids from solids. Scientists have found that magnetic nanoparticles can be especially helpful in locating cancerous cell clusters during MRI scans. Like tiny guided missiles, the nanoparticles seek out tumor cells and attach themselves to them. Once the nanoparticles attach themselves to these cancer cells, the particles operate like radio transmitters, greatly aiding the MRI's detection capability.

The study's findings have been published online in May 26, 2008, in the Journal of the American Chemical Society. The research was performed by Brown University chemist Dr. Shouheng Sun and a team of researchers from Brown University (Providence, RI, USA). The graduates students, included Jin Xie, Chenjie Xu, and Sheng Peng, collaborated on the research, along with Professor Xiaoyuan Chen and his associates from Stanford University (Stanford, CA, USA).

The team created peptide-coated iron oxide nanoparticles--particles billionths of a meter in size. The researchers injected the particles into mice and assessed their ability to locate a brain tumor cell called U87MG. Dr. Sun and his coworkers concentrated specifically on the nanoparticle's size and the thickness of the peptide coating, which ensures the nanoparticle attaches to the tumor cell.

Size is important because the trick is to create a nanoparticle that is small enough to navigate through the bloodstream and reach the diseased area. Bigger particles tend to stack up, creating the circulatory system's version of a traffic jam. Dr. Sun's team developed a nanoparticle that is about 8.4 nm in overall diameter--some six times smaller than the size of particles currently used in medicinal procedures.

"We wanted to make [the nanoparticle] very small, so the body's immune system won't recognize it,” Dr. Sun explained. "That way, you let more particles interact with and attach to the tumor cell.”

Nanoparticles are important in MRI detection because they enhance what scientists refer to as the contrast between the background, such as water molecules in the body, and a solid mass, such as a tumor. The coating, while integral to the nanoparticles' attachment to the tumor cell, also is crucial to establishing the signal-to-noise ratio that an MRI uses: the thinner the coating, the stronger the emitted signal and vice versa. Dr. Sun's team outfitted their nanoparticles with a two-nm thick peptide coating--10 times thinner than the coating available in popular MRI contrast agents such as Feridex. (Feridex's generic name is ferumoxides, and is manufactured by Amag Pharmaceuticals [Cambridge, MA, USA] and is sold in the United States by Bayer Healthcare Pharmaceuticals [Wayne, NJ, USA].)

Dr. Sun's nanoparticles are similar to having a 50,000-watt radio transmitter versus a 150-watt station; it is easier for the MRI to "hear” the stronger signal and to hone in on the signal's source. Another key feature of the team's research is discovering that the RGD peptide coating binds nearly seamlessly to the U87MG tumor cell.

The team plans to test the particle's ability to bind with other tumor cells in further animal studies.


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Image: In vivo imaging of U-87 MG xenograft model with varying mass doses of 89Zr-labeled KLG-3 or isotype control (Photo courtesy of L Gajecki et al.; doi.org/10.2967/jnumed.124.268762)

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89 (31.948089599609): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (80.82389831543): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (!!!!! 1110.0769042969): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (67.949295043945): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (32.186508178711): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
105 (59.843063354492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
106 (88.930130004883): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=286220000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (462.05520629883): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=286220000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1868.0095672607): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
109 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
110 (62.942504882812): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=286220000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (560.99891662598): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=286220000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (557.89947509766): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (338.07754516602): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
115 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
116 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
117 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
118 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
119 (34.809112548828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
120 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
121 (36.954879760742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
122 (293.01643371582): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 37512.063980103): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (498.05641174316): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=286220000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=286220000 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 23954.153060913): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (!!!!! 1909.9712371826): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (69.141387939453): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (44.107437133789): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (125.88500976562): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (46.014785766602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (444.17381286621): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (48.160552978516): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (53.882598876953): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (48.160552978516): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (468.01567077637): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (370.97930908203): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (249.86267089844): SELECT name FROM jos_deeppockets WHERE id=212
138 (32.901763916016): SELECT name FROM jos_deeppockets WHERE id=212
139 (617.98095703125): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (536.91864013672): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 2575.8743286133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
142 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
143 (!!!!! 16784.906387329): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 1269.1020965576): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=286220000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 1144.1707611084): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=286220000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 2051.1150360107): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
149 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
150 (!!!!! 1244.068145752): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
152 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
153 (416.04042053223): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=286220000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=286220000 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (706.91108703613): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
155 (56.028366088867): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
156 (48.87580871582): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (68.187713623047): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
158 (44.822692871094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=286220000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=286220000 AND published='1' LIMIT 1
159 (67.949295043945): select jos_twitters.link from jos_twitters where cat=10
160 (36.001205444336): select jos_facebook.link from jos_facebook where cat=10
161 (36.954879760742): select jos_google_plus.link from jos_google_plus where cat=10
162 (34.093856811523): select jos_linkedin.link from jos_linkedin where cat=10
163 (353.09791564941): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 5501.0318756104): insert into jos_banners_delta values (14615,'2025-06-30 17:37:36','216.73.216.249','view'),(14202,'2025-06-30 17:37:36','216.73.216.249','view'),(14203,'2025-06-30 17:37:36','216.73.216.249','view')