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Novel MRI Sensor Tracks Cerebral Signaling Processes

By MedImaging International staff writers
Posted on 12 Mar 2019
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Image: Nanoparticles aggregating in the presence of calcium; sensor particles in the absence (L) or presence (R) of calcium (Photo courtesy of Alan Jasanoff / MIT).
Image: Nanoparticles aggregating in the presence of calcium; sensor particles in the absence (L) or presence (R) of calcium (Photo courtesy of Alan Jasanoff / MIT).
A new manganese-based magnetic resonance imaging (MRI) contrast agent can image intracellular calcium ions deep within the brain, according to a new study.

Developed by researchers at the Massachusetts Institute of Technology (MIT, Cambridge, MA, USA), the manganese-based paramagnetic contrast agent (ManICS1-AM) is designed to permeate cells and undergo esterase cleavage. The contrast agent complex also contains a calcium-binding chelator. Once inside the cell, if calcium levels are low, the calcium chelator binds weakly to the manganese atom, shielding it from MRI detection. But when calcium flows into the cell, the chelator binds instead to the calcium, releasing the manganese, which makes ManICS1-AM appear brighter in an MRI image.

The researchers also tested ManICS1-AM in rats by injecting it into the striatum, a region deep within the brain that is involved in planning movement and learning new behaviors. They then used potassium ions to stimulate electrical activity in neurons of the striatum, and were able to measure the calcium response in small clusters of neurons involved in specific behaviors or actions. The new method can offer much more precise information on the location and timing of neuron activity than traditional functional MRI (fMRI), which measures blood flow in the brain. The study was published in the February 22, 2019, issue of Nature Communications.

“When neurons, or other brain cells called glia, become stimulated, they often experience more than tenfold increases in calcium concentration; our sensor can detect those changes,” said senior author Professor Alan Jasanoff, PhD. “In addition, this technique could be used to image calcium as it performs many other roles, such as facilitating the activation of immune cells. With further modification, it could also one day be used to perform diagnostic imaging of the brain or other organs whose functions rely on calcium, such as the heart.”

Calcium ions are essential to signal transduction in virtually all cells, where they coordinate processes ranging from embryogenesis to neural function and communication. Although optical probes for detecting intracellular calcium imaging have been available for decades, the development of probes for noninvasive detection of intracellular calcium signaling in deep tissue and intact organisms remains a challenge.

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97 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (102.04315185547): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (175.95291137695): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (83.92333984375): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (427.0076751709): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
105 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
106 (58.174133300781): 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=294777224 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (519.99092102051): 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=294777224 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1241.92237854): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
109 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
110 (77.962875366211): 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=294777224 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (529.05082702637): 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=294777224 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (545.97854614258): 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 (451.08795166016): 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 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
115 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
116 (110.86463928223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
117 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
118 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
119 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
120 (288.96331787109): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 47088.146209717): 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
122 (95.129013061523): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
123 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
124 (390.05279541016): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294777224 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294777224 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 594561.1000061): ( 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 (86.069107055664): ( 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 (445.12748718262): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
128 (61.988830566406): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (355.00526428223): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
130 (50.067901611328): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (263.21411132812): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
132 (49.114227294922): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (388.86070251465): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (410.07995605469): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (179.05235290527): SELECT name FROM jos_deeppockets WHERE id=212
136 (39.815902709961): SELECT name FROM jos_deeppockets WHERE id=212
137 (553.13110351562): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (519.99092102051): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
140 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
141 (!!!!! 7128.9539337158): TRUNCATE TABLE jos_trademed_module
142 (661.84997558594): 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=294777224 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (66.041946411133): 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=294777224 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (355.00526428223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
147 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
148 (!!!!! 1024.0077972412): 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
149 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
150 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
151 (71.048736572266): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294777224 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294777224 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (30.994415283203): 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)
153 (26.941299438477): 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)
154 (28.133392333984): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (!!!!! 3506.8988800049): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
156 (136.8522644043): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777224 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777224 AND published='1' LIMIT 1
157 (104.90417480469): select jos_twitters.link from jos_twitters where cat=10
158 (27.179718017578): select jos_facebook.link from jos_facebook where cat=10
159 (26.941299438477): select jos_google_plus.link from jos_google_plus where cat=10
160 (25.98762512207): select jos_linkedin.link from jos_linkedin where cat=10
161 (278.94973754883): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1087.9039764404): insert into jos_banners_delta values (14615,'2025-05-02 09:45:38','3.14.249.33','view'),(14202,'2025-05-02 09:45:38','3.14.249.33','view'),(14203,'2025-05-02 09:45:38','3.14.249.33','view')