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Alzheimers monitoring

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https://www.readbyqxmd.com/read/28809833/application-of-granger-causality-analysis-of-the-directed-functional-connection-in-alzheimer-s-disease-and-mild-cognitive-impairment
#1
Mei Wang, Zhengluan Liao, Dewang Mao, Qi Zhang, Yumei Li, Enyan Yu, Zhongxiang Ding
Impaired functional connectivity in the Default Mode Network (DMN) may be involved in the progression of Alzheimer's Disease (AD). The Posterior Cingulate Cortex (PCC) is a potential imaging marker for monitoring the progression of AD. Previous studies did not focus on the functional connectivity between the PCC and nodes in regions outside the DMN, but our study is an effort to explore these overlooked functional connections. For collecting data, we used functional Magnetic Resonance Imaging (fMRI) and Granger Causality Analysis (GCA)...
August 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28807158/effect-of-chinese-herbal-medicine-on-molecular-imaging-of-neurological-disorders
#2
Yao Yao, Ting Chen, Jing Huang, Hong Zhang, Mei Tian
Chinese herbal medicine has been used to treat a wide variety of neurological disorders including stroke, Alzheimer's disease, and Parkinson's disease. However, its mechanism behind the effectiveness remains unclear. Recently, molecular imaging technology has been applied for this purpose, since it can assess the cellular or molecular function in a living subject by using specific imaging probes and/or radioactive tracers, which enable efficient analysis and monitoring the therapeutic response repetitively...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28798684/differential-roles-of-environmental-enrichment-in-alzheimer-s-type-of-neurodegeneration-and-physiological-aging
#3
Vladimir V Salmin, Yulia K Komleva, Natalia V Kuvacheva, Andrey V Morgun, Elena D Khilazheva, Olga L Lopatina, Elena A Pozhilenkova, Konstantin A Shapovalov, Yulia A Uspenskaya, Alla B Salmina
Impairment of hippocampal adult neurogenesis in aging or degenerating brain is a well-known phenomenon caused by the shortage of brain stem cell pool, alterations in the local microenvironment within the neurogenic niches, or deregulation of stem cell development. Environmental enrichment (EE) has been proposed as a potent tool to restore brain functions, to prevent aging-associated neurodegeneration, and to cure neuronal deficits seen in neurodevelopmental and neurodegenerative disorders. Here, we report our data on the effects of environmental enrichment on hippocampal neurogenesis in vivo and neurosphere-forming capacity of hippocampal stem/progenitor cells in vitro...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28798312/the-hypothesis-that-helicobacter-pylori-predisposes-to-alzheimer-s-disease-is-biologically-plausible
#4
Contaldi Felice, Capuano Federico, Fulgione Andrea, Aiese Cigliano Riccardo, Sanseverino Walter, Iannelli Domenico, Medaglia Chiara, Capparelli Rosanna
There is epidemiological evidence that H. pylori might predispose to Alzheimer's disease. To understand the cellular processes potentially linking such unrelated events, we incubated the human gastric cells MNK-28 with the H. pylori peptide Hp(2-20). We then monitored the activated genes by global gene expression. The peptide modulated 77 genes, of which 65 are listed in the AlzBase database and include the hallmarks of Alzheimer's disease: APP, APOE, PSEN1, and PSEN2. A large fraction of modulated genes (30 out of 77) belong to the inflammation pathway...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28795815/monitoring-early-stage-protein-aggregation-by-an-aggregation-induced-emission-fluorogen
#5
Manjeet Kumar, Yuning Hong, David C Thorn, Heath Ecroyd, John A Carver
Highly ordered protein aggregates, termed amyloid fibrils, are associated with a broad range of diseases, many of which are neurodegenerative, for example Alzheimer's and Parkinson's. The transition from soluble, functional protein into insoluble amyloid fibril occurs via a complex process involving the initial generation of highly dynamic early-stage aggregates or prefibrillar species. Amyloid probes, for example thioflavin T and Congo red, have been used for decades as the gold standard for detecting amyloid fibrils in solution and tissue sections...
August 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28783132/study-of-alzheimer-s-disease-related-biophysical-kinetics-with-a-microslit-embedded-cantilever-sensor-in-a-liquid-environment
#6
Myung-Sic Chae, Jinsik Kim, Yong Kyoung Yoo, Jeong Hoon Lee, Tae Geun Kim, Kyo Seon Hwang
A microsized slit-embedded cantilever sensor (slit cantilever) was fabricated and evaluated as a biosensing platform in a liquid environment. In order to minimize the degradation caused by viscous damping, a 300 × 100 µm² (length × width) sized cantilever was released by a 5 µm gap-surrounding and vibrated by an internal piezoelectric-driven self-actuator. Owing to the structure, when the single side of the slit cantilever was exposed to liquid a significant quality factor (Q = 35) could be achieved. To assess the sensing performance, the slit cantilever was exploited to study the biophysical kinetics related to Aβ peptide...
August 7, 2017: Sensors
https://www.readbyqxmd.com/read/28776187/alzheimer-s-disease-related-amyloid-%C3%AE-1-42-peptide-induces-the-loss-of-human-sperm-function
#7
R S Tavares, S Martins, T Almeida-Santos, A P Sousa, J Ramalho-Santos, O A da Cruz E Silva
Characteristically identified as the main component of senile plaques present in patients suffering from Alzheimer's disease, Aβ has been detected in human testis and reproductive fluids, but its effect on spermatozoa has not been addressed. The present study evaluated whether the most toxic and aggregant amyloid precursor protein (APP)-proteolytic product, amyloid-β1-42 (Aβ1-42), was capable of affecting sperm functionality. Normozoospermic samples were either exposed to different Aβ1-42 doses or to the untreated and scrambled controls for a maximum of 48 h at 37 °C and 5%CO2, and motility, viability and mitochondrial status were evaluated...
August 3, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28768247/tracking-cognitive-decline-in-amnestic-mild-cognitive-impairment-and-early-stage-alzheimer-dementia-mini-mental-state-examination-versus-neuropsychological-battery
#8
Joonho Kim, Han Kyu Na, Justin Byun, Jiwon Shin, Sungsoo Kim, Byung Hwa Lee, Duk L Na
BACKGROUND/AIMS: Although the Mini-Mental State Examination (MMSE), Clinical Dementia Rating-Sum of Boxes (CDR-SOB), and neuropsychological batteries are widely used for evaluating cognitive function, it remains elusive which instrument best reflects the longitudinal disease progression in amnestic mild cognitive impairment (aMCI) and probable Alzheimer disease (AD). We investigated whether changes in these three instruments over time correlate with loss of cortical gray matter volume (cGMV)...
August 3, 2017: Dementia and Geriatric Cognitive Disorders
https://www.readbyqxmd.com/read/28753438/bilingual-language-intrusions-and-other-speech-errors-in-alzheimer-s-disease
#9
Tamar H Gollan, Alena Stasenko, Chuchu Li, David P Salmon
The current study investigated how Alzheimer's disease (AD) affects production of speech errors in reading-aloud. Twelve Spanish-English bilinguals with AD and 19 matched controls read-aloud 8 paragraphs in four conditions (a) English-only, (b) Spanish-only, (c) English-mixed (mostly English with 6 Spanish words), and (d) Spanish-mixed (mostly Spanish with 6 English words). Reading elicited language intrusions (e.g., saying la instead of the), and several types of within-language errors (e.g., saying their instead of the)...
July 25, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28752156/accounting-for-the-confound-of-meninges-in-segmenting-entorhinal-and-perirhinal-cortices-in-t1-weighted-mri
#10
Long Xie, Laura E M Wisse, Sandhitsu R Das, Hongzhi Wang, David A Wolk, Jose V Manjón, Paul A Yushkevich
Quantification of medial temporal lobe (MTL) cortices, including entorhinal cortex (ERC) and perirhinal cortex (PRC), from in vivo MRI is desirable for studying the human memory system as well as in early diagnosis and monitoring of Alzheimer's disease. However, ERC and PRC are commonly over-segmented in T1-weighted (T1w) MRI because of the adjacent meninges that have similar intensity to gray matter in T1 contrast. This introduces errors in the quantification and could potentially confound imaging studies of ERC/PRC...
October 2016: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/28750578/dynamic-predictions-in-bayesian-functional-joint-models-for-longitudinal-and-time-to-event-data-an-application-to-alzheimer-s-disease
#11
Kan Li, Sheng Luo
In the study of Alzheimer's disease, researchers often collect repeated measurements of clinical variables, event history, and functional data. If the health measurements deteriorate rapidly, patients may reach a level of cognitive impairment and are diagnosed as having dementia. An accurate prediction of the time to dementia based on the information collected is helpful for physicians to monitor patients' disease progression and to make early informed medical decisions. In this article, we first propose a functional joint model to account for functional predictors in both longitudinal and survival submodels in the joint modeling framework...
January 1, 2017: Statistical Methods in Medical Research
https://www.readbyqxmd.com/read/28740553/a-fluorogenic-probe-for-ultrafast-and-reversible-detection-of-formaldehyde-in-neurovascular-tissues
#12
Xing-Guang Liang, Bo Chen, Ling-Xiao Shao, Juan Cheng, Ming-Zhu Huang, Yu Chen, Yong-Zhou Hu, Yi-Feng Han, Feng Han, Xin Li
Formaldehyde (FA) is endogenously produced in live systems and has been implicated in a diverse array of pathophysiological processes. To disentangle the detailed molecular mechanisms of FA biology, a reliable method for monitoring FA changes in live cells would be indispensable. Although there have been several fluorescent probes reported to detect FA, most are limited by the slow detection kinetics and the intrinsic disadvantage of detecting FA in an irreversible manner which may disturb endogenous FA homeostasis...
2017: Theranostics
https://www.readbyqxmd.com/read/28734271/development-and-validation-of-sensitive-lc-ms-ms-method-for-the-quantification-of-suvn-502-and-its-metabolite-and-its-application-for-first-in-human-pharmacokinetic-study
#13
Ramakrishna Nirogi, Devender Reddy Ajjala, Raghupathi Aleti, Lakshmiprasanna Rayapati, Hanumanth Rao Pantangi, Rajesh Kumar Boggavarapu, Naga Surya Prakash Padala
A sensitive and rapid LC-MS/MS method was developed and validated for the quantification of SUVN-502 and M1 of SUVN-502, a 5-HT6 receptor antagonist for the treatment of dementia associated with Alzheimer's disease. Following solid-phase extraction, SUVN-502 and M1 of SUVN-502 and IS were eluted with 10mM ammonium acetate (pH 4.0) and acetonitrile using a rapid gradient program on reverse phase column. Multiple reaction monitoring mode was used to monitor the respective transitions of m/z 478.2→377.7 for SUVN-502 and m/z 464...
April 14, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28733957/a-review-of-biomarkers-for-alzheimer-s-disease-in-down-syndrome
#14
REVIEW
Ni-Chung Lee, Yin-Hsiu Chien, Wuh-Liang Hwu
Down syndrome (Trisomy 21; DS) is a unique disease known to be associated with early-onset Alzheimer's disease (AD). The initial presentation of AD in DS is usually difficult to recognize, owing to the underlying intellectual disabilities. Using biomarkers as a prediction tool for detecting AD in at-risk people with DS may benefit patient care. The objective of this review is to discuss the utility of biomarkers in DS on the basis of the pathophysiology of the disease and to provide an update on recent studies in this field...
July 2017: Neurology and Therapy
https://www.readbyqxmd.com/read/28723199/rational-design-of-a-stimuli-responsive-polymer-electrode-interface-coupled-with-in-vivo-microdialysis-for-measurement-of-sialic-acid-in-live-mouse-brain-in-alzheimer-s-disease
#15
Shushu Ding, Sumei Cao, Yingzi Liu, Ying Lian, Anwei Zhu, Guoyue Shi
Sensitive and selective monitoring of sialic acid (SA) in cerebral nervous system is of great importance for studying the role that SA plays in the pathological process of Alzheimer's disease (AD). In this work, we first reported an electrochemical biosensor based on a novel stimuli-responsive copolymer for selective and sensitive detection of SA in mouse brain. Notably, through synergetic hydrogen-bonding interactions, the copolymer could translate the recognition of SA into their conformational transition and wettability switch, which facilitated the access and enrichment of redox labels and targets to the electrode surface, thus significantly improving the detection sensitivity with the detection limit down to 0...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722437/surface-plasmon-resonance-clinical-biosensors-for-medical-diagnostics
#16
Jean-Francois Masson
The design and application of sensors for monitoring biomolecules in clinical samples is a common goal of the sensing research community. Surface plasmon resonance (SPR) and other plasmonic techniques such as localized surface plasmon resonance (LSPR) and imaging SPR are reaching a maturity level sufficient for their application in monitoring biomolecules in clinical samples. In recent years, the first examples for monitoring antibodies, proteins, enzymes, drugs, small molecules, peptides, and nucleic acids in biofluids collected from patients afflicted with a series of medical conditions (Alzheimer's, hepatitis, diabetes, leukemia, and cancers such as prostate and breast cancers, among others) demonstrate the progress of SPR sensing in clinical chemistry...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28720796/eeg-machine-learning-for-accurate-detection-of-cholinergic-intervention-and-alzheimer-s-disease
#17
Sonja Simpraga, Ricardo Alvarez-Jimenez, Huibert D Mansvelder, Joop M A van Gerven, Geert Jan Groeneveld, Simon-Shlomo Poil, Klaus Linkenkaer-Hansen
Monitoring effects of disease or therapeutic intervention on brain function is increasingly important for clinical trials, albeit hampered by inter-individual variability and subtle effects. Here, we apply complementary biomarker algorithms to electroencephalography (EEG) recordings to capture the brain's multi-faceted signature of disease or pharmacological intervention and use machine learning to improve classification performance. Using data from healthy subjects receiving scopolamine we developed an index of the muscarinic acetylcholine receptor antagonist (mAChR) consisting of 14 EEG biomarkers...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28712748/chi-a-contemporaneous-health-index-for-degenerative-disease-monitoring-using-longitudinal-measurements
#18
Yijun Huang, Qiang Meng, Heather Evans, William Lober, Yu Cheng, Xiaoning Qian, Ji Liu, Shuai Huang
In this paper, we develop a novel formulation for contemporaneous patient risk monitoring by exploiting the emerging data-rich environment in many healthcare applications, where an abundance of longitudinal data that reflect the degeneration of the health condition can be continuously collected. Our objective, and the developed formulation, is fundamentally different from many existing risk score models for different healthcare applications, which mostly focus on predicting the likelihood of a certain outcome at a pre-specified time...
July 13, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28707174/examining-the-role-of-microglia-and-astroglia-during-the-pathogenesis-of-alzheimer-s-disease-via-the-puri-li-model
#19
R A Thuraisingham
The Puri-Li kinetic model is explored here to study the contribution of microglia and astroglia during the pathogenesis of Alzheimer's disease (AD). This is carried out by solving the Puri-Li model under steady-state conditions. The derived expressions show that both of them play a role in the pathogenesis of AD. Examination of the steady-state solutions where microglia and astroglia are involved shows that equilibrium conditions are achieved by microglia and astroglia destroying neurons. These findings from this model are in agreement with the results in the literature, where microglia and astroglia are considered to act as inflammatory cells producing toxins to destroy neurons...
August 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/28702179/pathological-correlations-between-traumatic-brain-injury-and-chronic-neurodegenerative-diseases
#20
REVIEW
Marcela Cruz-Haces, Jonathan Tang, Glen Acosta, Joseph Fernandez, Riyi Shi
Traumatic brain injury is among the most common causes of death and disability in youth and young adults. In addition to the acute risk of morbidity with moderate to severe injuries, traumatic brain injury is associated with a number of chronic neurological and neuropsychiatric sequelae including neurodegenerative diseases such as Alzheimer's disease and Parkinson's disease. However, despite the high incidence of traumatic brain injuries and the established clinical correlation with neurodegeneration, the causative factors linking these processes have not yet been fully elucidated...
2017: Translational Neurodegeneration
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