Synthesis, Radioiodination and Biological distribution of 5-(5-(tributylstannyl) benzofuran-2-yl) pyridin-2-amine as an amyloid imaging agent
Published on: 26th December, 2017
OCLC Number/Unique Identifier: 7317576309
In this work an efficient method developed for the synthesis of 125I-benzofuran-2-yl) pyridin-2-amine (125IBPA), followed by radioiodination with 125I by using Chloramine-T at pH 8. The reaction proceeds within 10 min at room temperature (20-25°C). The radiochemical yield determined by Thin-Layer Chromatography (TLC) using hexane:ethyl acetate (1:6 v/v) and the purity analyzed by high-performance liquid chromatography using a reversed-phase RP18column and acetonitrile:0.1 M ammonium bicarbonate (pH 7.5) (1:1) as the mobile phase at a flow rate of 1 ml×min−1. The radiochemical yield using aH2O2 oxidant found equal to 96.5% with a radiochemical purity of 125I-BPA of over 96.5%. The biodistribution data in normal mice indicated a high initial uptake of 6.54±0.10 (% ID/g±SD) in the brain within 30 min post-injection. These results promote a further the use of 125I-BPA as a novel agent for brain imaging.
Focal Ab-amyloid deposition precedes cerebral microbleeds and Superficial siderosis: a case report
Published on: 13th October, 2017
OCLC Number/Unique Identifier: 7317598597
This case report presents in-vivo findings on the spatial and temporal relationship between focal Ab-amyloid deposition, cerebral micro-haemorrhages and superficial siderosis. A 65-year-old woman underwent 11C-PiB PET scans that revealed an atypical focal and asymmetrical pattern of Ab-amyloid deposition and MRI scans that revealed cerebral micro-haemorrhages and superficial siderosis. Almost all micro-haemorrhages were associated with focal Ab-amyloid deposition. Follow-up 11C-PiB PET and MRI scans showed progression of the disease. We speculate that Abamyloid deposition affects the structural integrity of arterioles, thereby predisposing them to micro haemorrhages. In support of this hypothesis, progression of MRI lesions was observed only in areas associated with Ab-amyloid deposition.
Sexual Dimorphism in the Length of the Corpus Callosum in Cadaver
Published on: 5th December, 2024
Context: Several texts and literature suggest that corpus callosum may be sexually dimorphic. Previous researchers found that the length of the corpus callosum is larger in males than in females. Reviewing various foreign literature found that the length of the corpus callosum may change in many diseases in Neurology, Neurosurgery, and Psychiatry. So, knowledge of the normal morphological difference of the length of corpus callosum between Bangladeshi males and females is essential for the diagnosis in brain imaging and treatment of those diseases. Objective: The present study was conducted to provide data on the length of the corpus callosum of our people, which can be used to set a standard measurement for the Bangladeshi population. Materials and methods: A cross-sectional, descriptive study was done in the Department of Anatomy, Dhaka Medical College, Dhaka, Bangladesh, from July 2009 to June 2010, based on the collection of 60 human brains (male 36 and female 24) from unclaimed dead bodies. The lengths were measured by using digital slide calipers in mm.Results: The mean length of the corpus callosum in males and females in groups A, B, C & D (grouping in done on age difference) were 68.04 ± 0.99 and 67.03 ± 0.05 mm, 67.50 ± 0.13 and 67.02 ± 0.03 mm and 67.51 ± 0.03 and 67.02 ± 0.03 mm respectively.Conclusion: Statistically significant differences were found between males and females in all age groups in the length of the corpus callosum.
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