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Tracking New Cancer-Killing Particles with MRI

By MedImaging International staff writers
Posted on 04 Jan 2010
Image: Nanoparticles destroying tumor. Artwork showing nanoparticles (blue) containing cytotoxic drugs, targeting tumor cells (purple), leading to their destruction (orange cells at upper left and upper right) (Photo courtesy of Medi-Mation).
Image: Nanoparticles destroying tumor. Artwork showing nanoparticles (blue) containing cytotoxic drugs, targeting tumor cells (purple), leading to their destruction (orange cells at upper left and upper right) (Photo courtesy of Medi-Mation).
Researchers have created a single nanoparticle that can be tracked in real time with magnetic resonance imaging (MRI) as it zeros in on cancer cells, tags them with a fluorescent dye, and destroys them with heat. The all-in-one particle is one of the first examples from a merging field called "theranostics,” which develops technologies physicians can use to diagnose and treat diseases in a single procedure.

The research, performed by investigators from Rice University (Houston, TX, USA) and Baylor College of Medicine (BCM; Houston, TX, USA), was published online in December 2009 in the journal Advanced Functional Materials. Tests up to now involve laboratory cell cultures, but the researchers reported that MRI tracking will be especially beneficial as they move toward tests in animals and people. "Some of the most essential questions in nanomedicine today are about biodistribution--where particles go inside the body and how they get there,” said study coauthor Dr. Naomi Halas. "Noninvasive tests for biodistribution will be enormously useful on the path to FDA [U.S. Food and Drug Administration] approval, and this technique--adding MRI functionality to the particle you're testing and using for therapy--is a very promising way of doing this.”

Dr. Halas, a Rice professor of electrical and computer engineering and professor of chemistry and biomedical engineering, is a pioneer in nanomedicine. The all-in-one particles are based on nanoshells--particles she invented in the 1990s that are currently in human clinical trials for cancer treatment. Nanoshells harvest laser light that would normally pass harmlessly through the body and convert it into tumor-killing heat.

In designing the new particle, Dr. Halas teamed up with Dr. Amit Joshi, assistant professor in BCM's division of molecular imaging, to engineer nanoshells by adding a fluorescent dye that glows when struck by near-infrared (NIR) light. NIR light is invisible and harmless, so NIR imaging could provide clinicians with a means of diagnosing diseases without surgery.

In looking for ways to attach the dye, Dr. Halas' graduate student, Rizia Bardhan, discovered that dye molecules emitted 40-50 times more light if a tiny gap was left between them and the surface of the nanoshell. The gap was just a few nanometers wide, but rather than waste the space, Ms. Bardhan inserted a layer of iron oxide that would be detectable with MRI. The researchers also attached an antibody that lets the particles bind to the surface of breast and ovarian cancer cells.

In the laboratory, the scientists tracked the fluorescent particles and confirmed that they targeted cancer cells and destroyed them with heat. Dr. Joshi stated that the next step would be to destroy whole tumors in live animals. He estimates that testing in humans is at least two years away, but the ultimate goal is a system where a patient gets a shot containing nanoparticles with antibodies that are customized for the patient's cancer. Utilizing NIR imaging, MRI, or a combination of the two, clinicians would observe the particles' progress through the body, identify areas where tumors exist, and then destroy them with heat. "This particle provides four options--two for imaging and two for therapy,” Dr. Joshi said. "We envision this as a platform technology that will present practitioners with a choice of options for directed treatment.”

Ultimately, Dr. Joshi hopes to develop specific versions of the particles that can attack cancer at different stages, particularly early stage cancer, which is difficult to diagnose and treat with current technology. The researchers also expect to utilize different antibody labels to target specific forms of the disease. According to Dr. Halas, the team has been careful to choose components that are either already approved for medical use or are already in clinical trials. "What's nice is that every single component of this has been approved or is on a path toward FDA [U.S. Food and Drug Administration] approval,” Dr. Halas noted. "We're putting together components that all have good, proven track records.”

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87 (87.976455688477): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727249 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (46.968460083008): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727249 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (49.114227294922): 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 (75.817108154297): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (46.968460083008): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (53.167343139648): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (39.815902709961): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (109.19570922852): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
105 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
106 (102.04315185547): 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=294727249 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (79.154968261719): 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=294727249 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (103.95050048828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
109 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
110 (67.949295043945): 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=294727249 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (715.01731872559): 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=294727249 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (893.11599731445): 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 (822.06726074219): 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 (177.14500427246): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
115 (88.930130004883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
116 (118.01719665527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
117 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
118 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
119 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
120 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
121 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
122 (462.05520629883): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 67533.96987915): 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 (!!!!! 1765.0127410889): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727249 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727249 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 23812.055587769): ( 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 (73.909759521484): ( 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 (50.067901611328): 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 (41.961669921875): 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 (51.021575927734): 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 (40.054321289062): 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 (459.90943908691): 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 (59.127807617188): 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 (43.153762817383): 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 (!!!!! 1054.048538208): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (624.17984008789): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (71.048736572266): SELECT name FROM jos_deeppockets WHERE id=212
138 (41.007995605469): SELECT name FROM jos_deeppockets WHERE id=212
139 (921.01097106934): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (925.06408691406): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (128.03077697754): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
142 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
143 (!!!!! 13718.843460083): TRUNCATE TABLE jos_trademed_module
144 (192.88063049316): 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=294727249 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (80.108642578125): 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=294727249 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (525.95138549805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (108.00361633301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
149 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
150 (!!!!! 1457.9296112061): 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 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
152 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
153 (61.03515625): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727249 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727249 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (37.908554077148): 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 (36.001205444336): 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 (46.968460083008): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (206.94732666016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
158 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727249 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727249 AND published='1' LIMIT 1
159 (71.048736572266): select jos_twitters.link from jos_twitters where cat=10
160 (40.054321289062): select jos_facebook.link from jos_facebook where cat=10
161 (44.107437133789): select jos_google_plus.link from jos_google_plus where cat=10
162 (43.153762817383): select jos_linkedin.link from jos_linkedin where cat=10
163 (309.94415283203): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 1273.8704681396): insert into jos_banners_delta values (14615,'2025-06-28 20:02:07','216.73.216.249','view'),(14202,'2025-06-28 20:02:07','216.73.216.249','view'),(14203,'2025-06-28 20:02:07','216.73.216.249','view')