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Novel PET Tracer Detects Brain Astrocyte Reactivity

By MedImaging International staff writers
Posted on 11 Aug 2021
Mapping analysis of significantly increased 11C-BU99008 uptake (Image courtesy of Molecular Psychiatry)
Mapping analysis of significantly increased 11C-BU99008 uptake (Image courtesy of Molecular Psychiatry)
A choline-based positron emission tomography (PET) tracer can be used to identify brain activity involved in the formation of amyloid plaque in people with cognitive impairment and Alzheimer's disease (AD), according to a new study.

Researchers at Imperial College London (Imperial; United Kingdom), Cardiff University (United Kingdom), and other institutions enrolled 11 older, cognitively impaired subjects and nine age-matched healthy controls in a study of the viability of 11C-BU99008, a new PET tracer, to selectively image astrocyte reactivity, which may precede early pathological signs of AD, such as the formation of β-amyloid plaque and tau tangles. The patients also underwent 3T magnetic resonance imaging (MRI) and 18F-florbetaben PET imaging to identify β-amyloid plaque.

The results showed that 11C-BU99008 uptake was higher in eight β-amyloid-positive patients with cognitive impairment across the whole brain, but particularly in frontal, temporal, medial temporal, and occipital lobes, compared with the control group. Biological parametric mapping demonstrated a positive voxel-wise neuroanatomical correlation between 11C-BU99008 and 18F-florbetaben uptake, confirming that 11C-BU99008 could measure astrocyte reactivity. The study was published on July 15, 2021, in Molecular Psychiatry.

“This proof-of-concept study provides direct evidence that 11C-BU99008 can measure in vivo astrocyte reactivity in people with late-life cognitive impairment and Alzheimer's disease,” concluded senior author Paul Edison, PhD, of the Imperial department of brain sciences, and colleagues. “Our results confirm that increased astrocyte reactivity is found particularly in cortical regions with high β-amyloid load.”

Astrocytes have a wide range of roles in the central nervous system, and astrocyte reactivity can increase the expression of inflammatory mediators, reactive oxygen species (ROS), and β-amyloid deposition. In fact, it has been suggested that astrocyte reactivity may be a tissue response to β-amyloid and may have a protective role by phagocytosing and degrading it. Minimally invasive methods for monitoring astrocyte reactivity in patients with late-life cognitive impairment can provide a tool for testing their contributions to disease progression.

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97 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (407.93418884277): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (49.114227294922): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
105 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
106 (108.00361633301): 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=294789240 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (78.916549682617): 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=294789240 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (651.83639526367): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
109 (94.890594482422): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
110 (162.83988952637): 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=294789240 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (431.06079101562): 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=294789240 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (616.07360839844): 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 (555.03845214844): 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 (115.15617370605): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
115 (89.883804321289): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
116 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
117 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
118 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
119 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
120 (273.9429473877): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 91560.125350952): 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 (328.06396484375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
123 (!!!!! 3813.0283355713): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
124 (370.97930908203): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294789240 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294789240 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 1087543.0107117): ( 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 (!!!!! 690074.9206543): ( 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 (221.96769714355): 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 (182.15179443359): 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 (81.062316894531): 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 (183.10546875): 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 (68.902969360352): 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 (97.990036010742): 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 (988.96026611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (833.03451538086): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (170.94612121582): SELECT name FROM jos_deeppockets WHERE id=215
136 (68.902969360352): SELECT name FROM jos_deeppockets WHERE id=215
137 (!!!!! 1052.8564453125): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (!!!!! 1061.9163513184): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (!!!!! 1667.0227050781): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
140 (375.98609924316): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
141 (!!!!! 9343.8625335693): TRUNCATE TABLE jos_trademed_module
142 (104.90417480469): 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=294789240 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (708.10317993164): 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=294789240 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (681.87713623047): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (159.02519226074): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (383.85391235352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
147 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
148 (!!!!! 1491.0697937012): 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 (326.87187194824): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
150 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
151 (!!!!! 4134.8934173584): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294789240 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294789240 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (59.127807617188): 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)
153 (36.954879760742): 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)
154 (45.061111450195): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (!!!!! 1036.1671447754): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
156 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294789240 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294789240 AND published='1' LIMIT 1
157 (416.04042053223): select jos_twitters.link from jos_twitters where cat=10
158 (33.140182495117): select jos_facebook.link from jos_facebook where cat=10
159 (29.087066650391): select jos_google_plus.link from jos_google_plus where cat=10
160 (28.133392333984): select jos_linkedin.link from jos_linkedin where cat=10
161 (693.08280944824): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (972.03254699707): insert into jos_banners_delta values (14615,'2025-06-18 10:40:21','216.73.216.120','view'),(14202,'2025-06-18 10:40:21','216.73.216.120','view'),(14203,'2025-06-18 10:40:21','216.73.216.120','view')