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https://www.readbyqxmd.com/read/28088078/genetically-tailored-magnetosomes-used-as-mri-probe-for-molecular-imaging-of-brain-tumor
#1
M Boucher, F Geffroy, S Prévéral, L Bellanger, E Selingue, G Adryanczyk-Perrier, M Péan, C T Lefèvre, D Pignol, N Ginet, S Mériaux
We investigate here the potential of single step production of genetically engineered magnetosomes, bacterial biogenic iron-oxide nanoparticles embedded in a lipid vesicle, as a new tailorable magnetic resonance molecular imaging probe. We demonstrate in vitro the specific binding and the significant internalization into U87 cells of magnetosomes decorated with RGD peptide. After injection at the tail vein of glioblastoma-bearing mice, we evidence in the first 2 h the rapid accumulation of both unlabeled and functionalized magnetosomes inside the tumor by Enhanced Permeability and Retention effects...
December 19, 2016: Biomaterials
https://www.readbyqxmd.com/read/28087726/benefit-of-mineralocorticoid-receptor-antagonism-in-aki-role-of-vascular-smooth-muscle-rac1
#2
Jonatan Barrera-Chimal, Gwennan André-Grégoire, Aurelie Nguyen Dinh Cat, Sebastian M Lechner, Jérôme Cau, Sonia Prince, Peter Kolkhof, Gervaise Loirand, Vincent Sauzeau, Thierry Hauet, Frédéric Jaisser
AKI is a frequent complication in hospitalized patients. Unfortunately, there is no effective pharmacologic approach for treating or preventing AKI. In rodents, mineralocorticoid receptor (MR) antagonism prevents AKI induced by ischemia-reperfusion (IR). We investigated the specific role of vascular MR in mediating AKI induced by IR. We also assessed the protective effect of MR antagonism in IR-induced AKI in the Large White pig, a model of human AKI. In mice, MR deficiency in smooth muscle cells (SMCs) protected against kidney IR injury...
January 13, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/28087310/clinical-features-and-three-year-outcomes-of-takotsubo-stress-cardiomyopathy-observational-data-from-one-center
#3
Sigita Glaveckaitė, Pranas Šerpytis, Dovilė Pečiūraitė, Roma Puronaitė, Nomeda Valevičienė
OBJECTIVE: The natural history, management, and outcome of Takotsubo (stress) cardiomyopathy (TTC) is not clear. The aim of this study was to investigate clinical features, define prognostic predictors, and assess the clinical course and outcomes of patients with TTC. METHODS: We analyzed 64 patients (52 women) meeting the proposed Mayo Clinic diagnostic criteria for TTC. All patients were treated at Vilnius University Hospital Santariskiu Klinikos from 2001-01-01 to 2014-11-27...
November 16, 2016: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/28087064/effect-of-cyp2d6-polymorphisms-on-the-pharmacokinetics-of-propafenone-and-its-two-main-metabolites
#4
Mohammad-Reza Rouini, Minoo Afshar
AIM OF THE STUDY: Propafenone (PPF) is an antiarrhythmic drug, metabolized mainly by CYP2D6 to 5-hydroxypropafenone (5OH-PPF) and by CYP3A4 to norpropafenone (NOR-PPF). CYP2D6 shows a high degree of genetic polymorphism which is associated with diminished antiarrhythmic efficacy or cardiac seizures/cardiotoxicity. This study aimed to investigate the effect of the CYP2D6 polymorphism on the pharmacokinetics of PPF and its two main metabolites. The usefulness of PPF/5OH-PPF ratio for CYP2D6 phenotyping in healthy adults was also evaluated...
December 19, 2016: Thérapie
https://www.readbyqxmd.com/read/28086888/non-rigid-mr-trus-image-registration-for-image-guided-prostate-biopsy-using-correlation-ratio-based-mutual-information
#5
Lun Gong, Haifeng Wang, Chengtao Peng, Yakang Dai, Min Ding, Yinghao Sun, Xiaodong Yang, Jian Zheng
BACKGROUND: To improve the accuracy of ultrasound-guided biopsy of the prostate, the non-rigid registration of magnetic resonance (MR) images onto transrectal ultrasound (TRUS) images has gained increasing attention. Mutual information (MI) is a widely used similarity criterion in MR-TRUS image registration. However, the use of MI has been challenged because of intensity distortion, noise and down-sampling. Hence, we need to improve the MI measure to get better registration effect. METHODS: We present a novel two-dimensional non-rigid MR-TRUS registration algorithm that uses correlation ratio-based mutual information (CRMI) as the similarity criterion...
January 10, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28086840/evidence-of-multiple-insecticide-resistance-mechanisms-in-anopheles-gambiae-populations-in-bangui-central-african-republic
#6
Marina Lidwine Olé Sangba, Aboubakar Sidick, Renaud Govoetchan, Christian Dide-Agossou, Razaki A Ossè, Martin Akogbeto, Mamadou Ousmane Ndiath
BACKGROUND: Knowledge of insecticide resistance status in the main malaria vectors is an essential component of effective malaria vector control. This study presents the first evaluation of the status of insecticide resistance in Anopheles gambiae populations from Bangui, the Central African Republic. METHODS: Anopheles mosquitoes were reared from larvae collected in seven districts of Bangui between September to November 2014. The World Health Organisation's bioassay susceptibility tests to lambda-cyhalothrin (0...
January 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28080301/assessing-social-cognition-age-related-changes-in-moral-reasoning-in-childhood-and-adolescence
#7
V Chiasson, E Vera-Estay, G Lalonde, J J Dooley, M H Beauchamp
OBJECTIVE: There is increasing recognition that socio-cognitive skills, such as moral reasoning (MR), are affected in a wide range of developmental and neuropsychological conditions. However, the lack of appropriate measures available to neuropsychologists poses a challenge for the direct assessment of these skills. This study sought to explore age-related changes in MR using an innovative visual tool and examine the developmental sensitivity of the task. METHOD: To address some of the methodological limitations of traditional measures of MR, a novel, visual task, the Socio-Moral Reasoning Aptitude Level (So-Moral), was used to evaluate MR in 216 healthy participants aged 6-20 years...
January 12, 2017: Clinical Neuropsychologist
https://www.readbyqxmd.com/read/28079395/diagnostic-performance-of-wrist-magnetic-resonance-mr-arthrography-comparison-of-three-dimensional-isotropic-t1-weighted-fast-spin-echo-mr-arthrography-and-two-dimensional-mr-arthrography
#8
Eunsun Oh, Young Cheol Yoon, Min Jong Park
OBJECTIVES: To compare the diagnostic performance of wrist direct magnetic resonance arthrography (D-MRA) with 2D T1-weighted fast spin-echo (FSE) and 3D isotropic T1-weighted FSE sequences for detecting triangular fibrocartilage (TFC) central perforations and scapholunate ligament (SLL) and lunotriquetral ligament (LTL) tears. METHODS: Twenty-six patients who had undergone preoperative wrist D-MRA with 2D and 3D isotropic T1-weighted FSE sequences and subsequent arthroscopic surgeries were included...
January 12, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28079361/controllable-synthesis-of-smart-multifunctional-nanoscal-metal-organic-framework-for-magnetic-resonance-optical-imaging-and-targeted-drug-delivery
#9
Xuechuan Gao, Manjue Zhai, Weihua Guan, Jingjuan Liu, Zhiliang Liu, Alatangaole Damirin
As a result of their extraordinarily large surfaces and well-defined pores, the design of multifunctional metal-organic framework (MOF) is crucial for drug delivery while has been rarely reported. In this paper, a novel drug delivery system (DDS) based on nanoscale metal-organic framework (MOF) was developed for using in cancer diagnosis and therapy. This MOF based tumour targeting DDS was fabricated by a simple post-synthetic surface modification process. Firstly, magnetic mesoporous nanomaterial Fe-MIL-53-NH2 was devoted for encapsulating the drug and served as a magnetic resonance (MR) contrast agent...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079289/apocrine-metaplasia-found-at-mr-biopsy-is-there-something-to-be-learned
#10
Yiming Gao, Vandana Dialani, Carolynn DeBenedectis, Nicole Johnson, Elena Brachtel, Priscilla Slanetz
The purpose of this study was to determine (a) the frequency of apocrine metaplasia (ApoM) found on MR core biopsy of suspicious findings, and (b) to determine if there are specific MR imaging features that might obviate the need for biopsy. This HIPAA-compliant retrospective study was performed under IRB exemption for quality assurance studies. Patient demographics, MR imaging features, and pathology were reviewed. Breast lesions which underwent MR-guided biopsy, yielding ApoM on pathology analysis were included...
January 12, 2017: Breast Journal
https://www.readbyqxmd.com/read/28079264/electromagnetic-computation-and-modeling-in-mri
#11
REVIEW
Xin Chen, Michael Steckner
Electromagnetic (EM) computational modeling is used extensively during the development of a Magnetic Resonance Imaging (MRI) scanner, its installation, and use. MRI, which relies on interactions between nuclear magnetic moments and the applied magnetic fields, uses a range of EM tools to optimize all of the magnetic fields required to produce the image. The main field magnet is designed to exacting specifications but challenges in manufacturing, installation, and use require additional tools to maintain target operational performance...
January 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/28079018/methyl-red-decolorization-efficiency-of-a-korea-strain-of-aspergillus-sp-immobilized-into-different-polymeric-matrices
#12
Beom-Su Kim
Intensive research studies have revealed that fungal decolorization of dye wastewater is a promising replacement for the current process of dye wastewater decolorization. We isolated an Aspergillus sp. from the effluent of a textile industry area in Korea and assessed the effects of a variety of operational parameters on the decolorization of methyl red (MR) by this strain of Aspergillus sp. This Aspergillus sp. was then immobilized by entrapment in several polymeric matrices and the effects of operational conditions on MR decolorization were investigated again...
December 22, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28078889/quantification-of-free-polyelectrolytes-present-in-colloidal-suspension-revealing-a-source-of-toxic-responses-for-polyelectrolyte-wrapped-gold-nanoparticles
#13
Tian A Qiu, Marco D Torelli, Ariane M Vartanian, Nathan B Rackstraw, Joseph T Buchman, Lisa M Jacob, Catherine J Murphy, Robert J Hamers, Christy L Haynes
Polyelectrolyte (PE) wrapping of colloidal nanoparticles (NPs) is a standard method to control NP surface chemistry and charge. Because excess polyelectrolytes are usually employed in the surface modification process, it is critical to evaluate different purification strategies to obtain a clean final product and thus avoid ambiguities in the source of effects on biological systems. In this work, 4 nm diameter gold nanoparticles (AuNPs) were wrapped with 15 kDa poly(allylamine hydrochloride) (PAH), and three purification strategies were applied: (a) diafiltration or either (b) one round or (c) two rounds of centrifugation...
January 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28078564/mri-measurements-of-brainstem-structures-in-patients-with-vascular-parkinsonism-progressive-supranuclear-palsy-and-parkinson-s-disease
#14
Byeong C Kim, Seong-Min Choi, Kang-Ho Choi, Tai-Seung Nam, Joon-Tae Kim, Seung-Han Lee, Man-Seok Park, Woong Yoon
Magnetic resonance (MR) measurements of brainstem structures have been reported to be useful in differentiating patients with progressive supranuclear palsy (PSP) from those with Parkinson's disease (PD). The aim of this study was to determine whether quantitative measurements of brainstem structures on MR images can help differentiate vascular parkinsonism (VaP) from degenerative parkinsonism (PD and PSP). Areas of the midbrain and pons, and widths of the superior cerebellar peduncle (SCP) and middle cerebellar peduncle (MCP) were measured in 62 patients with PD, 25 patients with PSP (11 probable and 14 possible), and 24 patients with VaP on T 1-weighted MR images...
January 11, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28078511/intra-individual-comparison-of-different-gadolinium-based-contrast-agents-in-the-quantitative-evaluation-of-c6-glioma-with-dynamic-contrast-enhanced-magnetic-resonance-imaging
#15
Ying Li, Gang Liu, Xin Lou, Zhiye Chen, Lin Ma
This experiment aimed to compare the ionic (Gadodiamide, Gd-DTPA-BMA) and non-ionic (Gadopentetate dimeglumine, Gd-DTPA) gadolinium-based contrast agents (GBCA) in the quantitative evaluation of C6 glioma with dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). A C6 glioma model was established in 12 Wistar rats, and magnetic resonance (MR) scans were performed six days after tumor implantation. Imaging was performed using a 3.0-T MR scanner with a 7-inch handmade circular coil. Pre-contrast T1 mapping and dynamic contrast-enhanced T1WI after a bolus injection (0...
January 4, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28078505/t2-relaxation-time-measurements-in-the-brains-of-scalded-rats
#16
Tao Jiang, Liqi Xie, Xin Lou, Dawei Li, Zhiye Chen, Huafeng Xiao, Lin Ma
This study aimed to evaluate the T2 relaxation time of the brain in severely scalded rats using a magnetic resonance (MR) T2 mapping sequence, and to investigate the correlation between T2 relaxation time and plasma glucose level. Twenty-eight Wistar rats were randomly divided into the scalded group (n=21) and control group (n=7). Magnetic resonance scans were performed with T1WI, T2WI, and T2-mapping sequences in the scalded group; the scans were performed 1 day prior to scalding and 1, 3, 5, and 7 days post-scalding; in addition, identical MR scans were performed in the control group at the same time points...
January 4, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28078364/-ligament-injuries-of-fingers-and-thumbs
#17
R Schmitt
Degenerative and traumatic ligament lesions of the carpometacarpal joints frequently occur at the thumb ray, whereas the carpometacarpal amphiarthrosis of other finger rays are rarely affected. The metacarpophalangeal and interphalangeal joints of the thumb and fingers are stabilized by bilaterally running collateral ligaments and palmar plates. At the base of the metacarpophalangeal joints, several ligaments of the extensor hoods guide the extensor tendons and coordinate the fine motoric skills of phalangeal flexing and extending...
January 11, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28078116/pretreatment-tumor-volume-as-a-prognostic-factor-in-metastatic-colorectal-cancer-treated-with-selective-internal-radiation-to-the-liver-using-yttrium-90-resin-microspheres
#18
Neha Bhooshan, Navesh K Sharma, Shahed Badiyan, Adeel Kaiser, Fred M Moeslein, Young Kwok, Pradip P Amin, Svetlana Kudryasheva, Michael D Chuong
BACKGROUND: Yttrium-90 ((90)Y)-resin microspheres can prolong intrahepatic disease control and improve overall survival (OS) in patients with metastatic colorectal cancer (CRC). Prognostic factors for improved outcomes in patients undergoing selective internal radiation therapy (SIRT) have been studied, but the relationship between pre-SIRT liver tumor volume and outcomes has not well described. METHODS: We retrospectively reviewed the records of patients with metastatic CRC who were treated at our institution with (90)Y-resin microspheres...
December 2016: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/28077908/magnetic-resonance-imaging-of-a-case-of-central-neurocytoma
#19
Kreshnike Dedushi, Serbeze Kabashi, Mehmet Sahin Ugurel, Naser Ramadani, Sefedin Mucaj, Kamber Zeqiraj
BACKGROUND: The purpose of this study is to investigate the MRI features of central neurocytoma. CASE REPORT: A 45 year old man with 3 months of worsening daily headaches. These headaches were diffuse, lasted for several hours, and mostly occurred in the morning. She was initially diagnosed and treated for migraines but later he had epileptic attack and diplopia and neurolog recomaded MRI. METHODS: precontrast MRI; TSE/T2Wsequence in axial/coronal planes; 3D-Hi-resolution T1W sagittal; FLAIR/T2W axial; FLAIR/T2W and Flash/T2W oblique coronal plane (perpendicular to temporal lobes) GRE/T2W axial plane for detection of heme products...
December 2016: Acta Informatica Medica: AIM
https://www.readbyqxmd.com/read/28077817/prognostic-significance-of-non-dilated-left-ventricular-size-and-mitral-regurgitation-in-patients-with-dilated-phase-of-hypertrophic-cardiomyopathy
#20
Toru Kubo, Yuichi Baba, Takayoshi Hirota, Katsutoshi Tanioka, Naohito Yamasaki, Yoshinori L Doi, Hiroaki Kitaoka
Although a subtype of hypertrophic cardiomyopathy (HCM), dilated phase of HCM (D-HCM) characterized by left ventricular (LV) systolic dysfunction, has been reported to have a poor prognosis, some patients with D-HCM survive for a relatively long period. The degree of LV dilatation and functional mitral regurgitation (MR) are generally thought to be important predictors of poor prognosis in patients with LV systolic dysfunction. However, there is little information available on the relations among LV size, presence of significant MR, and prognosis in D-HCM patients...
January 11, 2017: International Heart Journal
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