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Brain Iron Accumulation Linked to Alzheimer's Cognitive Decline

By MedImaging International staff writers
Posted on 14 Jul 2020
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Image: R2* maps of healthy control participants and participants with AD (Photo courtesy of RSNA)
Image: R2* maps of healthy control participants and participants with AD (Photo courtesy of RSNA)
A new magnetic resonance imaging (MRI) study shows iron accumulation in the brain is associated with cognitive deterioration in people with Alzheimer's disease (AD).

Researchers at the Medical University of Graz (Austria) and Ludwig-Maximilians-Universität (LMU; Munich, Germany), conducted a 3T MRI study of brain iron levels using R2* relaxation rate mapping in 100 AD patients (mean age 73 years, 58 women), and 100 matched healthy controls. At 17 month follow up, 56 AD patient underwent neuropsychological testing and brain MRI. All participants had median R2* values calculated in the neocortex and cortical lobes, basal ganglia (BG), hippocampi, and thalami, as a measure of iron deposition.

The results showed median R2* levels were higher in the AD group than in the control group in the BG and total neocortex, and regionally in the occipital and temporal lobes. In addition, R2* values in the temporal lobe reflected changes in iron levels over time and were associated with cognitive decline in individuals with AD, as measured by Consortium to Establish a Registry for Alzheimer’s Disease (CERAD) total score, independent of longitudinal changes in brain volume. The study was published on June 30, 2020, in Radiology.

“These results are all in keeping with the view that high concentrations of iron significantly promote amyloid beta deposition and neurotoxicity in Alzheimer's disease,” said senior author professor of neurology Reinhold Schmidt, MD, of the Medical University of Graz. “Our study provides support for the hypothesis of impaired iron homeostasis in AD and indicates that the use of iron chelators in clinical trials might be a promising treatment target.”

Magnetite (Fe3O4) particles in the human brain were first reported in 1992 in the post‐mortem brain, drawing interest due to its strong interaction with elements in the brain, due to a combination of redox activity, strong magnetic behavior, particle surface charge, and Fenton‐like chemistry. While magnetite appears to serve a physiological purpose in the normal brain, it has been established that it is strongly associated with degenerative diseases of the brain, especially in AD, where magnetite nanoparticles were found associated with tangles and plaques.

Related Links:
Medical University of Graz
Ludwig-Maximilians-Universität


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97 (413.89465332031): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (638.00811767578): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (127.07710266113): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (308.03680419922): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (330.92498779297): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (146.15058898926): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (101.08947753906): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (669.95620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
105 (585.79444885254): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
106 (230.07392883301): 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=294783446 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (160.93254089355): 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=294783446 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1556.1580657959): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
109 (140.90538024902): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
110 (555.99212646484): 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=294783446 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (521.18301391602): 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=294783446 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (517.12989807129): 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 (289.9169921875): 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 (80.82389831543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
115 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
116 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
117 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
118 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
119 (36.954879760742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
120 (138.0443572998): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 50116.062164307): 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 (!!!!! 5545.1393127441): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
123 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
124 (353.09791564941): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294783446 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294783446 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 750005.00679016): ( 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 (72.002410888672): ( 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 (38.862228393555): 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 (29.087066650391): 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 (36.954879760742): 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 (27.894973754883): 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 (27.894973754883): 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 (27.894973754883): 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 (416.99409484863): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (385.99967956543): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (211.00044250488): SELECT name FROM jos_deeppockets WHERE id=212
136 (32.186508178711): SELECT name FROM jos_deeppockets WHERE id=212
137 (446.08116149902): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (341.89224243164): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
140 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
141 (!!!!! 7759.0942382812): TRUNCATE TABLE jos_trademed_module
142 (93.936920166016): 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=294783446 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (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_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=294783446 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (733.1371307373): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
147 (44.822692871094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
148 (!!!!! 1097.2023010254): 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 (49.829483032227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
150 (38.862228393555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
151 (45.061111450195): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294783446 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294783446 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (29.087066650391): 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 (43.869018554688): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
156 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294783446 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294783446 AND published='1' LIMIT 1
157 (39.100646972656): select jos_twitters.link from jos_twitters where cat=10
158 (33.140182495117): select jos_facebook.link from jos_facebook where cat=10
159 (30.040740966797): select jos_google_plus.link from jos_google_plus where cat=10
160 (30.994415283203): select jos_linkedin.link from jos_linkedin where cat=10
161 (200.03318786621): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1076.2214660645): insert into jos_banners_delta values (14615,'2025-05-01 21:33:17','3.133.59.209','view'),(14202,'2025-05-01 21:33:17','3.133.59.209','view'),(14203,'2025-05-01 21:33:17','3.133.59.209','view')