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PET Imaging Agent for Detection of Tau Pathologies Shows Promise for Alzheimer’s Patients

By MedImaging International staff writers
Posted on 20 Sep 2012
Study findings suggest the use of [18F]-T808 as a positron emission tomography (PET) imaging agent for has potential for detecting tau protein pathologies associated with Alzheimer’s disease (AD).

Siemens Healthcare (Erlangen, Germany) announced the publication of research data on its [18F]-T808 compound used in positron emission tomography (PET) imaging that selectively targets neurofibrillary tangles (NFTs) of tau protein--a significant hallmark of AD. Siemens Healthcare, which supported the study research in its entirety, is developing the [18F]-labeled compound as a potential PET imaging agent for commercialization. The study’s findings were published in the August 2012 issue of the Journal of Alzheimer’s Disease.

NFTs of hyperphosphorylated tau protein are one of two critical protein abnormalities associated with AD, the other being senile plaques consisting of beta-amyloid peptides. Both protein abnormalities are considered to be targets for therapeutic intervention, in addition to being biomarkers for diagnostic in vivo imaging agents. The severity of tau abnormalities and NFT burden consistently correlates with the degree of cognitive impairment and neuronal circuitry deterioration associated with Alzheimer’s disease dementia, whereas the presence of senile brain plaques lack that correlation. For this reason, NFT can potentially be an additional imaging biomarker for Alzheimer’s-related dementia.

A research team led by Hartmuth C. Kolb, PhD, vice president of molecular imaging biomarker research at Siemens Healthcare, designed, synthesized, and assessed more than 900 compounds in an effort to identify [18F]-PET tracers that possess strong binding affinity and selectivity toward tau protein tangles. Researchers created a competitive autoradiography assay to test compounds that would bind to native tau tangles and beta-amyloid plaques on sections of postmortem human brain tissue.

In in-vitro assays, the compound [18F]-T808 displayed a high level of binding affinity and good selectivity for tau aggregates over beta-amyloid plaques. The compound showed quick uptake and washout in rat brains. The researchers’ in vivo and in vitro studies suggest that [18F]-T808 possesses suitable characteristics to be a specific and selective PET tracer for the imaging of paired helical filament tau in human brains.

“Highly selective and high-affinity tau PET imaging agents are needed to support evaluation and research into potential therapeutic efforts to manage tau-related diseases,” Dr. Kolb said. “Preclinical characterization of [18F]-T808 demonstrated high levels of binding affinity, selectivity, and specificity, which makes this agent a suitable candidate for further study as a PET tracer for tau aggregate imaging.”

A major issue with AD is identifying a biomarker that can be correlated with the progression of clinical symptoms and allow extrapolation back to early preclinical stages. This appears possible in the case of tau deposits. The study’s authors plan to assess the [18F]-T808 tracer clinically in Alzheimer’s disease patients to determine its usefulness as an early diagnostic tool of the disease.

[18F]-T808 is the first highly selective and specific PET tracer with potential for in vivo neurological imaging of tau pathologies. It is metabolically stable and has fast uptake and rapid washout period in rodents.

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94 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
105 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
106 (50.067901611328): 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=294742606 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (46.968460083008): 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=294742606 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
109 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
110 (50.783157348633): 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=294742606 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (364.06517028809): 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=294742606 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (573.15826416016): 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 (328.06396484375): 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 (74.148178100586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
115 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
116 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
117 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
118 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
119 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
120 (193.83430480957): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 23452.043533325): 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 (101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
123 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
124 (354.05158996582): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294742606 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294742606 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 610517.97866821): ( 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 (138.99803161621): ( 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 = 294800513 LIMIT 1
128 (31.948089599609): 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 (46.014785766602): 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 (39.815902709961): 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 (47.206878662109): 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 (37.193298339844): 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 (630.14030456543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (!!!!! 2830.982208252): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (299.93057250977): SELECT name FROM jos_deeppockets WHERE id=213
136 (36.954879760742): SELECT name FROM jos_deeppockets WHERE id=213
137 (635.14709472656): 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 '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (607.01370239258): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (111.81831359863): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
140 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
141 (!!!!! 16199.111938477): TRUNCATE TABLE jos_trademed_module
142 (121.8318939209): 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=294742606 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (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_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=294742606 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (592.94700622559): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (85.115432739258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (106.0962677002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
147 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
148 (!!!!! 1535.8924865723): 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 (93.936920166016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
150 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
151 (67.949295043945): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294742606 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294742606 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (598.19221496582): 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=213 or channel_id is null)
153 (53.882598876953): 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=213 or channel_id is null)
154 (48.160552978516): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (96.08268737793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
156 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742606 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742606 AND published='1' LIMIT 1
157 (59.843063354492): select jos_twitters.link from jos_twitters where cat=10
158 (38.14697265625): select jos_facebook.link from jos_facebook where cat=10
159 (41.007995605469): select jos_google_plus.link from jos_google_plus where cat=10
160 (40.054321289062): select jos_linkedin.link from jos_linkedin where cat=10
161 (390.05279541016): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 2456.1882019043): insert into jos_banners_delta values (14615,'2025-06-20 11:55:12','216.73.216.120','view'),(14202,'2025-06-20 11:55:12','216.73.216.120','view'),(14203,'2025-06-20 11:55:12','216.73.216.120','view')