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https://www.readbyqxmd.com/read/28436445/cortical-thickness-and-subcortical-gray-matter-volume-in-pediatric-anxiety-disorders
#1
Andrea L Gold, Elizabeth R Steuber, Lauren K White, Jennifer Pacheco, Jessica F Sachs, David Pagliaccio, Erin Berman, Ellen Leibenluft, Daniel S Pine
Perturbations in the prefrontal cortex (PFC), hippocampus, and amygdala are implicated in the development of anxiety disorders. However, most structural neuroimaging studies of patients with anxiety disorders utilize adult samples, and the few studies in youths examine small samples, primarily with volume-based measures. This study tested the hypothesis that cortical thickness of PFC regions and gray matter volume of the hippocampus and amygdala differ between pediatric anxiety disorder patients and healthy volunteers (HVs)...
April 24, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28435046/a-multilevel-roi-features-based-machine-learning-method-for-detection-of-morphometric-biomarkers-in-parkinson-s-disease
#2
Bo Peng, Suhong Wang, Zhiyong Zhou, Yan Liu, Baotong Tong, Tao Zhang, Yakang Dai
Machine learning methods have been widely used in recent years for detection of neuroimaging biomarkers in regions of interest (ROIs) and assisted diagnosis of neurodegenerative diseases. The innovation of this study is to use multilevel-ROI-features-based machine learning method to detect sensitive morphometric biomarkers in Parkinson's disease (PD). Specifically, the low-level ROI features (gray matter volume, cortical thickness, etc.) and high-level correlative features (connectivity between ROIs) are integrated to make the multilevel ROI features...
April 20, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28434125/kidney-morphological-parameters-measured-using-noncontrast-enhanced-steady-state-free-precession-mri-with-spatially-selective-inversion-recovery-pulse-correlate-with-egfr-in-patients-with-advanced-ckd
#3
Tadashi Otsuka, Yoshikatsu Kaneko, Yuya Sato, Ryohei Kaseda, Ryuji Aoyagi, Suguru Yamamoto, Shin Goto, Ichiei Narita
BACKGROUND: It is well known that atrophic renal changes are associated with chronic kidney disease (CKD) progression, but conventional diagnostic imaging methods such as noncontrast-enhanced computed tomography and magnetic resonance imaging (MRI) have been insufficient for precisely assessing kidney function because they cannot clearly distinguish between the medulla and cortex. Hence, here we used noncontrast-enhanced steady-state free precession (SSFP) MRI with a spatially selective inversion recovery (IR) pulse to improve visibility for renal corticomedullary differentiation and evaluated the association between morphological parameters and kidney function in patients with CKD...
April 22, 2017: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/28433420/dna-methylation-program-in-normal-and-alcohol-induced-thinning-cortex
#4
Nail Can Öztürk, Marisol Resendiz, Hakan Öztürk, Feng C Zhou
While cerebral underdevelopment is a hallmark of fetal alcohol spectrum disorders (FASD), the mechanism(s) guiding the broad cortical neurodevelopmental deficits are not clear. DNA methylation is known to regulate early development and tissue specification through gene regulation. Here, we examined DNA methylation in the onset of alcohol-induced cortical thinning in a mouse model of FASD. C57BL/6 (B6) mice were administered a 4% alcohol (v/v) liquid diet from embryonic (E) days 7-16, and their embryos were harvested at E17, along with isocaloric liquid diet and lab chow controls...
February 20, 2017: Alcohol
https://www.readbyqxmd.com/read/28432379/high-resolution-tomography-based-quantification-of-cortical-porosity-and-cortical-thickness-at-the-surgical-neck-of-the-humerus-during-aging
#5
Tobias Helfen, Christoph M Sprecher, Ursula Eberli, Boyko Gueorguiev, Peter E Müller, Robert G Richards, Florian Schmidutz
Fractures of the proximal humerus are highly related to age and osteoporotic bone remodeling. Previous studies have highlighted the cortex as a major side of the bone loss, but the microstructural changes of the humerus have not been evaluated entirely. Sixty-four (n = 64) humeri of a representative collective (18-100 years) were scanned with high-resolution peripheral quantitative computed tomography (82 µm). Bone mineral density (BMD), trabecular bone volume fraction (Tb.BV/TV), cortical thickness (Ct...
April 21, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28432144/age-related-effects-and-sex-differences-in-gray-matter-density-volume-mass-and-cortical-thickness-from-childhood-to-young-adulthood
#6
Efstathios D Gennatas, Brian B Avants, Daniel H Wolf, Theodore D Satterthwaite, Kosha Ruparel, Rastko Ciric, Hakon Hakonarson, Raquel E Gur, Ruben C Gur
Developmental structural neuroimaging studies in humans have long described decreases in gray matter volume and cortical thickness during adolescence. Gray matter density, a measure often assumed to be highly related to volume, has not been systematically investigated in development. We used T1 imaging data collected on the Philadelphia Neurodevelopmental Cohort to study age-related effects and sex differences in four regional gray matter measures in 1189 youths aged 8 to 23 years. Custom T1 segmentation and a novel high-resolution gray matter parcellation were used to extract gray matter density (GMD), gray matter volume (GMV), gray matter mass (GMM, defined as GMD * GMV), and cortical thickness (CT) from 1625 brain regions...
April 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28429052/the-skeletal-impact-of-the-chemotherapeutic-agent-etoposide
#7
A J Koh, B P Sinder, P Entezami, L Nilsson, L K McCauley
Effects of the chemotherapeutic agent etoposide on the skeleton were determined in mice. Numbers of bone marrow cells were reduced and myeloid cells were increased. Bone volume was significantly decreased with signs of inhibition of bone formation. Etoposide after pre-treatment with zoledronic acid still reduced bone but overall bone volume was higher than with etoposide alone. INTRODUCTION: Chemotherapeutics target rapidly dividing tumor cells yet also impact hematopoietic and immune cells in an off target manner...
April 20, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28428078/kinetic-reconstruction-reveals-time-dependent-effects-of-romosozumab-on-bone-formation-and-osteoblast-function-in-vertebral-cancellous-and-cortical-bone-in-cynomolgus-monkeys
#8
Rogely Waite Boyce, Qing-Tian Niu, Michael S Ominsky
Romosozumab, a humanized monoclonal sclerostin antibody under development for the treatment of osteoporosis, has a unique mechanism of action on bone-increasing bone formation and decreasing bone resorption. The effects on bone formation are transient, eliciting a rapid increase in bone formation that attenuates with continued treatment. Although bone formation attenuates, bone mineral density (BMD) continues to increase. To explore potential tissue-level mechanisms that could contribute to a progressive increase in spine BMD, we used kinetic reconstruction techniques to examine the effects of romosozumab on modeling and remodeling units in vertebral cancellous bone from adult cynomolgus monkeys administered romosozumab for 10 and 28weeks...
April 18, 2017: Bone
https://www.readbyqxmd.com/read/28427472/optimising-conservative-management-of-chronic-low-back-pain-study-protocol-for-a-randomised-controlled-trial
#9
Katherine J Simson, Clint T Miller, Jon Ford, Andrew Hahne, Luana Main, Timo Rantalainen, Wei-Peng Teo, Megan Teychenne, David Connell, Guy Trudel, Guoyan Zheng, Gary Thickbroom, Daniel L Belavy
BACKGROUND: Lower back pain is a global health issue affecting approximately 80% of people at some stage in their life. The current literature suggests that any exercise is beneficial for reducing back pain. However, as pain is a subjective evaluation and physical deficits are evident in low back pain, using it as the sole outcome measure to evaluate superiority of an exercise protocol for low back pain treatment is insufficient. The overarching goal of the current clinical trial is to implement two common, conservative intervention approaches and examine their impact on deficits in chronic low back pain...
April 20, 2017: Trials
https://www.readbyqxmd.com/read/28426947/structural-neuroplasticity-of-the-superior-temporal-plane-in-early-and-late-blindness
#10
Hicret Atilgan, Olivier Collignon, Uri Hasson
Blindness is associated with well-documented changes to the morphometry and function of the occipital cortex. By comparison, its impact on the perisylvian regions in the superior temporal plane (STP) is poorly understood, with many studies reporting null findings on this issue. Here we re-approach this question using a morphometric analysis that relied on fine-scale, manual annotation of 13 sub-regions within the STP and that quantified both univariate and multivariate differences in morphometry. We applied these analyses to both cortical thickness (CT) and surface area (SA) data from congenitally and late blind, as compared to two matched sighted control groups...
April 17, 2017: Brain and Language
https://www.readbyqxmd.com/read/28426817/evaluation-of-machine-learning-algorithms-and-structural-features-for-optimal-mri-based-diagnostic-prediction-in-psychosis
#11
Raymond Salvador, Joaquim Radua, Erick J Canales-Rodríguez, Aleix Solanes, Salvador Sarró, José M Goikolea, Alicia Valiente, Gemma C Monté, María Del Carmen Natividad, Amalia Guerrero-Pedraza, Noemí Moro, Paloma Fernández-Corcuera, Benedikt L Amann, Teresa Maristany, Eduard Vieta, Peter J McKenna, Edith Pomarol-Clotet
A relatively large number of studies have investigated the power of structural magnetic resonance imaging (sMRI) data to discriminate patients with schizophrenia from healthy controls. However, very few of them have also included patients with bipolar disorder, allowing the clinically relevant discrimination between both psychotic diagnostics. To assess the efficacy of sMRI data for diagnostic prediction in psychosis we objectively evaluated the discriminative power of a wide range of commonly used machine learning algorithms (ridge, lasso, elastic net and L0 norm regularized logistic regressions, a support vector classifier, regularized discriminant analysis, random forests and a Gaussian process classifier) on main sMRI features including grey and white matter voxel-based morphometry (VBM), vertex-based cortical thickness and volume, region of interest volumetric measures and wavelet-based morphometry (WBM) maps...
2017: PloS One
https://www.readbyqxmd.com/read/28425622/targeted-disruption-of-nf1-in-osteocyte-increases-fgf23-and-osteoid-with-osteomalacia-like-bone-phenotype
#12
Nobuhiro Kamiya, Ryosuke Yamaguchi, Olumide Aruwajoye, Audrey Kim, Gen Kuroyanagi, Matthew Phipps, Naga Suresh Adapala, Jian Q Feng, Harry K W Kim
Neurofibromatosis type 1 (NF1, OMIM 162200), caused by NF1 gene mutations, exhibits multi-system abnormalities including skeletal deformities in humans. Osteocytes play critical roles in controlling bone modeling and remodeling. However, the role of neurofibromin, the protein product of the NF1 gene, in osteocytes is largely unknown. This study investigated the role of neurofibromin in osteocytes by disrupting Nf1 under the Dmp1-promoter. The conditional knockout (Nf1 cKO) mice displayed serum profile of a metabolic bone disorder with an osteomalacia-like bone phenotype...
April 20, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28425185/the-influence-of-hippocampal-atrophy-on-the-cognitive-phenotype-of-dementia-with-lewy-bodies
#13
Greg J Elder, Karen Mactier, Sean J Colloby, Rosie Watson, Andrew M Blamire, John T O'Brien, John-Paul Taylor
OBJECTIVE: The level of hippocampal atrophy in dementia with Lewy bodies (DLB) is typically less than that observed in Alzheimer's disease (AD). However, it is not known how the cognitive phenotype of DLB is influenced by hippocampal atrophy or the atrophy of adjacent medial temporal lobe structures. METHODS: Dementia with Lewy bodies (n = 65), AD (n = 76) and control (n = 63) participants underwent 3T magnetic resonance imaging and cognitive Cambridge Cognitive Examination and Mini-Mental State Examination (CAMCOG and MMSE) assessments...
April 20, 2017: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28423023/nanoscale-modifications-in-the-early-heating-stages-of-bone-are-heterogeneous-at-the-microstructural-scale
#14
Aurélien Gourrier, Céline Chadefaux, Estelle Lemaitre, Ludovic Bellot-Gurlet, Michael Reynolds, Manfred Burghammer, Marie Plazanet, Georges Boivin, Delphine Farlay, Oliver Bunk, Ina Reiche
Nanoscale studies of bone provide key indicators to evidence subtle structural changes that may occur in the biomedical, forensic and archaeological contexts. One specific problem encountered in all those disciplines, for which the identification of nanostructural cues could prove useful, is to properly monitor the effect of heating on bone tissue. In particular, the mechanisms at work at the onset of heating are still relatively unclear. Using a multiscale approach combining Raman microspectroscopy, transmission electron microscopy (TEM), synchrotron quantitative scanning small-angle X-ray scattering imaging (qsSAXSI) and polarized light (PL) microscopy, we investigate the ultrastructure of cortical bovine bone heated at temperatures < 300°C, from the molecular to the macroscopic scale...
2017: PloS One
https://www.readbyqxmd.com/read/28420972/multi-modal-multi-measure-and-multi-class-discrimination-of-adhd-with-hierarchical-feature-extraction-and-extreme-learning-machine-using-structural-and-functional-brain-mri
#15
Muhammad Naveed Iqbal Qureshi, Jooyoung Oh, Beomjun Min, Hang Joon Jo, Boreom Lee
Structural and functional MRI unveil many hidden properties of the human brain. We performed this multi-class classification study on selected subjects from the publically available attention deficit hyperactivity disorder ADHD-200 dataset of patients and healthy children. The dataset has three groups, namely, ADHD inattentive, ADHD combined, and typically developing. We calculated the global averaged functional connectivity maps across the whole cortex to extract anatomical atlas parcellation based features from the resting-state fMRI (rs-fMRI) data and cortical parcellation based features from the structural MRI (sMRI) data...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28419811/augmentation-of-distal-biceps-repair-with-an-acellular-dermal-graft-restores-native-biomechanical-properties-in-a-tendon-deficient-model
#16
Christine Conroy, Paul Sethi, Craig Macken, David Wei, Marc Kowalsky, Raffy Mirzayan, Leo Pauzenberger, Felix Dyrna, Elifho Obopilwe, Augustus D Mazzocca
BACKGROUND: The majority of distal biceps tendon injuries can be repaired in a single procedure. In contrast, complete chronic tears with severe tendon substance deficiency and retraction often require tendon graft augmentation. In cases with extensive partial tears of the distal biceps, a human dermal allograft may be used as an alternative to restore tendon thickness and biomechanical integrity. HYPOTHESIS: Dermal graft augmentation will improve load to failure compared with nonaugmented repair in a tendon-deficient model...
April 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28417232/healthy-cortical-development-through-adolescence-and-early-adulthood
#17
Natalie J Forde, Lisa Ronan, Marcel P Zwiers, Lizanne J S Schweren, Aaron F Alexander-Bloch, Barbara Franke, Stephen V Faraone, Jaap Oosterlaan, Dirk J Heslenfeld, Catharina A Hartman, Jan K Buitelaar, Pieter J Hoekstra
Adolescence is a period of significant brain changes; however, the effects of age and sex on cortical development are yet to be fully characterized. Here, we utilized innovative intrinsic curvature (IC) analysis, along with the traditional cortical measures [cortical thickness (CT), local gyrification index (LGI), and surface area (SA)], to investigate how these indices (1) relate to each other and (2) depend on age and sex in adolescent cortical development. T1-weighted magnetic resonance images from 218 healthy volunteers (age range 8...
April 17, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28414856/radiographic-and-ultrasonographic-findings-of-the-spleen-and-abdominal-lymph-nodes-in-healthy-domestic-ferrets
#18
J N Suran, L V Latney, N R Wyre
OBJECTIVE: To describe the radiographic and ultrasonographic characteristics of the spleen and abdominal lymph nodes in clinically healthy ferrets. MATERIALS AND METHODS: Fifty-five clinically healthy ferrets were prospectively recruited for this cross-sectional study. Three-view whole body radiographs and abdominal ultrasonography were performed on awake (23 out of 55) or sedated (32 out of 55) ferrets. On radiographs splenic and abdominal lymph node visibility was assessed...
April 17, 2017: Journal of Small Animal Practice
https://www.readbyqxmd.com/read/28414250/longitudinal-changes-in-brain-morphology-from-4-weeks-to-12-months-after-mild-traumatic-brain-injury-associations-with-cognitive-functions-and-clinical-variables
#19
T Hellstrom, L T Westlye, S Sigurdardottir, C Brunborg, H L Soberg, Ø Holthe, A Server, M J Lund, O A Andreassen, N Andelic
OBJECTIVE: To investigate longitudinal changes in cortical and subcortical volumes in patients with mild traumatic brain injury (MTBI) and to evaluate whether such changes were associated with self-reported post-concussive symptoms, global functional outcomes and neuropsychological functioning. METHODS: This was a prospecitve, longitudinal cohort study of patients with complicated (i.e presence of intracranial abnormalities on the day of injury CT) and uncomplicated MTBI (i...
April 17, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28412941/survival-prediction-in-amyotrophic-lateral-sclerosis-based-on-mri-measures-and-clinical-characteristics
#20
Christina Schuster, Orla Hardiman, Peter Bede
BACKGROUND: Amyotrophic lateral sclerosis (ALS) a highly heterogeneous neurodegenerative condition. Accurate diagnostic, monitoring and prognostic biomarkers are urgently needed both for individualised patient care and clinical trials. A multimodal magnetic resonance imaging study is presented, where MRI measures of ALS-associated brain regions are utilised to predict 18-month survival. METHODS: A total of 60 ALS patients and 69 healthy controls were included in this study...
April 17, 2017: BMC Neurology
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