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Radiation-Free Approach Images Molecules in Brain

By MedImaging International staff writers
Posted on 22 Dec 2016
Image: CGRP-based sensors dilate blood vessels in the brain to make them visible on MRI (Photo courtesy of Alan Jasanoff / MIT).
Image: CGRP-based sensors dilate blood vessels in the brain to make them visible on MRI (Photo courtesy of Alan Jasanoff / MIT).
A new study describes how protein-based sensors can cause blood vessels to dilate near their targets, allowing them to be detected by magnetic resonance imaging (MRI).

Developed by researchers at the Massachusetts Institute of Technology (MIT, Cambridge, MA, USA), the probes are based on a modified calcitonin gene-related peptide (CGRP), which is active primarily during migraines or inflammation. The novel CGRP-related peptide is used to artificially activate vasculature dilation at nanomolar concentrations, thus enhancing an endogenous multimodal tissue contrast which can then be readily measured by optical and MRI scans in order to determine where the proteases were detected.

In order to direct the CGRP-related peptide to their targets, they have been engineered so that they are trapped within a protein enclosure that keeps them from interacting with blood vessels. But when the peptides encounter proteases in the brain, the enclosures are disrupted, releasing CGRP, which causes nearby blood vessels to dilate. The researchers are now working on adapting the design to monitor neurotransmitters by modifying the enclosures surrounding the CGRP so that they can be removed by interaction with a specific neurotransmitter. The study was published on December 2, 2016, in Nature Communications.

“Currently the gold standard approach to imaging molecules in the brain is to tag them with radioactive probes. However, these probes offer low resolution and they can't easily be used to watch dynamic events,” said lead author professor of biological engineering Alan Jasanoff, PhD. “This is an idea that enables us to detect molecules that are in the brain at biologically low levels, and to do that with these imaging agents or contrast agents that can ultimately be used in humans.”

The vasculature is one of the most potent endogenous contrast sources available to imaging modalities. Vascular hemodynamic changes can be evoked by a variety of chemical species, many of which act at nanomolar concentrations. The changes in blood volume, flow, or oxygenation are robustly detectable by MRI, optical, and ultrasound-based noninvasive imaging, as well as by positron emission tomography (PET), single photon computed tomography, and X-ray imaging with intravascular tracers.

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94 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (65.803527832031): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
105 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
106 (49.114227294922): 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=294767383 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (48.87580871582): 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=294767383 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
109 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
110 (51.021575927734): 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=294767383 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (479.93659973145): 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=294767383 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (608.92105102539): 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 (389.81437683105): 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 (132.08389282227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
115 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
116 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
117 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
118 (94.175338745117): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
119 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
120 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
121 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
122 (375.98609924316): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 26944.875717163): 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 (571.96617126465): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294767383 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294767383 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 18468.856811523): ( 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 (58.889389038086): ( 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 (38.14697265625): 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 (29.802322387695): 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 (41.007995605469): 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 (30.994415283203): 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 (43.869018554688): 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 (32.901763916016): 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 (30.040740966797): 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 (449.89585876465): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (313.99726867676): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (38.14697265625): SELECT name FROM jos_deeppockets WHERE id=215
138 (28.848648071289): SELECT name FROM jos_deeppockets WHERE id=215
139 (619.88830566406): 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 '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (522.13668823242): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
142 (45.7763671875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
143 (!!!!! 7930.0403594971): TRUNCATE TABLE jos_trademed_module
144 (274.1813659668): 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=294767383 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (186.92016601562): 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=294767383 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (766.03889465332): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
149 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
150 (!!!!! 1177.0725250244): 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 (84.877014160156): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
152 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
153 (52.928924560547): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294767383 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294767383 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (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=215 or channel_id is null)
155 (47.922134399414): 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=215 or channel_id is null)
156 (33.855438232422): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
158 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294767383 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294767383 AND published='1' LIMIT 1
159 (36.001205444336): select jos_twitters.link from jos_twitters where cat=10
160 (30.040740966797): select jos_facebook.link from jos_facebook where cat=10
161 (30.994415283203): select jos_google_plus.link from jos_google_plus where cat=10
162 (31.948089599609): select jos_linkedin.link from jos_linkedin where cat=10
163 (233.88862609863): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
164 (943.89915466309): insert into jos_banners_delta values (14202,'2025-06-22 13:52:07','216.73.216.120','view'),(14203,'2025-06-22 13:52:07','216.73.216.120','view')