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Sheryl A Zelenitsky, Jacy Howarth, Philippe Lagace-Wiens, Christie Sathianathan, Robert Ariano, Christine Davis, Mauro Verrelli
♦ Background: Information related to the microbiology of peritonitis is critical to the optimal management of patients receiving peritoneal dialysis (PD). The goal was to characterize the microbiological etiology and antimicrobial susceptibilities of PD-related peritonitis (PDRP) from 2005 to 2014, inclusive. ♦ Methods: The distribution of organisms in culture-positive PDRP was described for new episodes and relapse infections, and further detailed for monomicrobial and polymicrobial peritonitis. Annual and overall rates of PDRP were also characterized...
October 13, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
Paul J Mattis, Martin Niethammer, Wataru Sako, Chris C Tang, Amir Nazem, Marc L Gordon, Vicky Brandt, Vijay Dhawan, David Eidelberg
OBJECTIVE: To determine whether cognitive impairment in Parkinson disease (PD) and Alzheimer disease (AD) derives from the same network pathology. METHODS: We analyzed (18)F-fluorodeoxyglucose PET scans from 40 patients with AD and 40 age-matched healthy controls from the Alzheimer's Disease Neuroimaging Initiative and scanned an additional 10 patients with AD and 10 healthy controls at The Feinstein Institute for Medical Research to derive an AD-related metabolic pattern (ADRP) analogous to our previously established PD cognition-related pattern (PDCP) and PD motor-related pattern (PDRP)...
October 5, 2016: Neurology
Laure Peyro Saint Paul, Maxence Ficheux, Danièle Debruyne, Magalie Loilier, Nicolas Bouvier, Rémy Morello, Jean-Jacques Parienti, Renaud Verdon, François Fournel, Vincent Cattoir, Thierry Lobbedez
♦ Background: Antibiotics are preferentially delivered via the peritoneal route to treat peritoneal dialysis-related peritonitis (PDRP) to ensure that maximal concentrations are delivered to the site of infection. Our study focused on the pharmacokinetics of daptomycin (DAP) administered via the intraperitoneal (IP) route in patients with PDRP. ♦ Methods: According to the DaptoDP protocol (Clinical Trial No. 2012-005699-33), IP DAP was administered daily, i.e., during the 6-h Nutrineal (Baxter Healthcare Corporation, Deerfield, IL, USA) dwell time period, for 14 days, in addition to administration of the antibiotics used for the usual care of patients with PDRP...
September 28, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
Wei-Xi Xiong, Yi-Min Sun, Rong-Yuan Guan, Su-Shan Luo, Chen Chen, Yu An, Jian Wang, Jian-Jun Wu
The missense mutation A53T of alpha-synuclein gene (SNCA) was reported to be a rare but definite cause of sporadic and familial Parkinson disease (PD). It seemed to be restricted geographically in Greece and Italy. We aimed to identify the SNCA mutations in a Chinese PD cohort. Ninety-one early onset PD patients or familial PD probands were collected consecutively for the screening of PD-related genes. The genetic analysis was carried out by target sequencing of the exons and the corresponding flanking regions of the PD-related genes using Illumina HiSeq 2000 sequencer and further confirmed by Sanger sequencing or restriction fragment length polymorphism...
October 2016: Journal of Neurology
Hoang-Ton Nguyen, Eelco van Duinkerken, Frank D Verbraak, Bettine C P Polak, Peter J Ringens, Michaela Diamant, Annette C Moll
BACKGROUND: Diabetic retinopathy (DRP) is a common microvascular complication seen in patients with type 1 diabetes mellitus (T1DM). The effects of T1DM and concomitant (proliferative) DRP on retinal blood flow are currently unclear. Therefore, we measured retinal vascular blood flow in T1DM patients with and without DRP and non-diabetic controls. We further assessed the acute effects of panretinal photocoagulation on retinal microvascular bloodflow in eight patients with diabetes. METHODS: Thirty-three T1DM patients with proliferative DRP, previously treated with panretinal photocoagulation (pDRP), 11 T1DM patients with untreated non-proliferative retinopathy (npDRP) and 32 T1DM patients without DRP (nDRP) were compared with 44 non-diabetic gender-matched controls...
2016: BMC Endocrine Disorders
Lun Jiang, Yi-Bo Chen, Jiangge Zheng, Zhenhang Chen, Yujie Liu, Ye Tao, Wei Wu, Zhongzhou Chen, Bai-Chen Wang
Pyruvate orthophosphate dikinase (PPDK) is one of the most important enzymes in C4 photosynthesis. PPDK regulatory protein (PDRP) regulates the inorganic phosphate-dependent activation and ADP-dependent inactivation of PPDK by reversible phosphorylation. PDRP shares no significant sequence similarity with other protein kinases or phosphatases. To investigate the molecular mechanism by which PDRP carries out its dual and competing activities, we determined the crystal structure of PDRP from maize (Zea mays)...
February 2016: Plant Physiology
Florian Holtbernd, Yilong Ma, Shichun Peng, Frank Schwartz, Lars Timmermann, Lutz Kracht, Gereon R Fink, Chris C Tang, David Eidelberg, Carsten Eggers
Parkinson's disease (PD) is associated with distinct metabolic covariance patterns that relate to the motor and cognitive manifestations of the disorder. It is not known, however, how the expression of these patterns relates to measurements of nigrostriatal dopaminergic activity from the same individuals. To explore these associations, we studied 106 PD subjects who underwent cerebral PET with both (18) F-fluorodeoxyglucose (FDG) and (18) F-fluoro-L-dopa (FDOPA). Expression values for the PD motor- and cognition-related metabolic patterns (PDRP and PDCP, respectively) were computed for each subject; these measures were correlated with FDOPA uptake on a voxel-by-voxel basis...
September 2015: Human Brain Mapping
Min-Hua Tseng, Chih-Jen Cheng, Chih-Chien Sung, Yu-Ching Chou, Pauling Chu, Giien Shuen Chen, Shih-Hua Lin
BACKGROUND: Hyponatremia is known to be a marker of poor prognosis in many clinical conditions. The association between hyponatremia and clinical outcomes in peritoneal dialysis-related peritonitis (PDRP) has not been studied. We evaluated the association between hyponatremia and clinical parameters of patients with PDRP. METHODS: We conducted a retrospective analysis of medical records of patients with PDRP admitted to a medical center in the period 2004-2011. Patients with serum Na+ <130 mEq/L and ≥ 130 mEq/L at admission were divided into hyponatremic and normonatremic groups, respectively...
2014: BMC Nephrology
Yi-Bo Chen, Tian-Cong Lu, Hong-Xia Wang, Jie Shen, Tian-Tian Bu, Qing Chao, Zhi-Fang Gao, Xin-Guang Zhu, Yue-Feng Wang, Bai-Chen Wang
In C4 plants, pyruvate orthophosphate dikinase (PPDK) activity is tightly dark/light regulated by reversible phosphorylation of an active-site Thr residue; this process is catalyzed by PPDK regulatory protein (PDRP). Phosphorylation and dephosphorylation of PPDK lead to its inactivation and activation, respectively. Here, we show that light intensity rather than the light/dark transition regulates PPDK activity by modulating the reversible phosphorylation at Thr527 (previously termed Thr456; Ashton and Hatch [1983], Biochem Biophys Res Commun...
April 8, 2014: Plant Physiology
Florian Holtbernd, Jean-François Gagnon, Ron B Postuma, Yilong Ma, Chris C Tang, Andrew Feigin, Vijay Dhawan, Mélanie Vendette, Jean-Paul Soucy, David Eidelberg, Jacques Montplaisir
OBJECTIVE: To determine whether the Parkinson disease-related covariance pattern (PDRP) expression is abnormally increased in idiopathic REM sleep behavior disorder (RBD) and whether increased baseline activity is associated with greater individual risk of subsequent phenoconversion. METHODS: For this cohort study, we recruited 2 groups of RBD and control subjects. Cohort 1 comprised 10 subjects with RBD (63.5 ± 9.4 years old) and 10 healthy volunteers (62.7 ± 8...
February 18, 2014: Neurology
Orhan Ates, Habip Bilen, Sadullah Keles, H Hakan Alp, Mevlüt Sait Keleş, Kenan Yıldırım, Osman Ondaş, L Can Pınar, Mustafa Civelekler, Orhan Baykal
AIM: To determine the relationship between proliferative diabetic retinopathy (PDRP) and plasma coenzyme Q10(CoQ10) concentration. METHODS: Patients with type 2 diabetes and PDRP were determined to be the case group (n=50). The control group was consist of healthy individuals (n=50). Plasma CoQ10 and malondialdehyde (MDA) levels were measured in both groups. RESULTS: Ubiquinone-10 (Coenzyme Q10) levels in PDRP and control subjects are 3.81±1...
2013: International Journal of Ophthalmology
Shichun Peng, Yilong Ma, Phoebe G Spetsieris, Paul Mattis, Andrew Feigin, Vijay Dhawan, David Eidelberg
To generate imaging biomarkers from disease-specific brain networks, we have implemented a general toolbox to rapidly perform scaled subprofile modeling (SSM) based on principal component analysis (PCA) on brain images of patients and normals. This SSMPCA toolbox can define spatial covariance patterns whose expression in individual subjects can discriminate patients from controls or predict behavioral measures. The technique may depend on differences in spatial normalization algorithms and brain imaging systems...
May 2014: Human Brain Mapping
Ping Wu, Jian Wang, Shichun Peng, Yilong Ma, Huiwei Zhang, Yihui Guan, Chuantao Zuo
The objective of this study was to validate Parkinson's disease-related pattern (PDRP) as a measure of network biomarker of Parkinson's disease (PD) in Chinese population by using 18F-fluorodeoxyglucose (FDG) and Positron Emission Tomography (PET). Resting-state brain FDG PET imaging was performed in a cohort of 33 PD patients and 33 age/gender-matched healthy controls to identify a PDRP. PDRP expression was then computed in a new cohort of 30 PD patients and 30 healthy controls using a voxel-based network quantification algorithm...
June 2013: Parkinsonism & related Disorders
Komal Arora, Naghum Alfulaij, Jason K Higa, Jun Panee, Robert A Nichols
Although the interaction between β-amyloid (Aβ) and nicotinic acetylcholine receptors has been widely studied, the impact of prolonged exposure to Aβ on nAChR expression and signaling is not known. In this study, we employed a neuronal culture model to better understand the impact of sustained exposure of Aβ on the regulation of cellular and synaptic function. The differentiated rodent neuroblastoma cell line NG108-15 expressing exogenous high-affinity α4β2 nAChRs was exposed to soluble oligomeric Aβ for several days...
April 19, 2013: Journal of Biological Chemistry
Vijay Dhawan, Chris C Tang, Yilong Ma, Phoebe Spetsieris, David Eidelberg
Changes in regional brain activity can be observed following global normalization procedures to reduce variability in the data. In particular, spurious regional differences may appear when scans from patients with low global activity are compared to those from healthy subjects. It has thus been suggested that the consistent increases in subcortical activity that characterize the abnormal Parkinson's disease-related metabolic covariance pattern (PDRP) are artifacts of global normalization, and that similar topographies can be identified in scans from healthy subjects with varying global activity...
December 2012: NeuroImage
K L Poston, C C Tang, T Eckert, V Dhawan, S Frucht, J-P Vonsattel, S Fahn, D Eidelberg
OBJECTIVE: Multiple system atrophy (MSA), the most common of the atypical parkinsonian disorders, is characterized by the presence of an abnormal spatial covariance pattern in resting state metabolic brain images from patients with this disease. Nonetheless, the potential utility of this pattern as a MSA biomarker is contingent upon its specificity for this disorder and its relationship to clinical disability in individual patients. METHODS: We used [(18)F]fluorodeoxyglucose PET to study 33 patients with MSA, 20 age- and severity-matched patients with idiopathic Parkinson disease (PD), and 15 healthy volunteers...
April 17, 2012: Neurology
Helen Carr, Katie Buchanan
This paper reports on a study that aimed to review a Practice Development and Research Partnership (PDRP) that was formed between an NHS community trust and a higher education institute (HEI) in 2008. Specific objectives were to focus on exploring stakeholders' views and experiences of the PDRP and to identify opportunities, barriers or challenges that were encountered. The ultimate goal of the PDRP was to promote partnership working between practitioners and academics in creating a culture of research and innovation in improving patient care, experiences and services...
September 2011: Community Practitioner: the Journal of the Community Practitioners' & Health Visitors' Association
Chris J Chastain, Christopher J Failing, Lumu Manandhar, Margaret A Zimmerman, Mitchell M Lakner, Tony H T Nguyen
Pyruvate,orthophosphate dikinase (PPDK) plays a controlling role in the PEP-regeneration phase of the C(4) photosynthetic pathway. Earlier studies have fully documented its biochemical properties and its post-translational regulation by the PPDK regulatory protein (PDRP). However, the question of its evolution into the C(4) pathway has, until recently, received little attention. One assumption concerning this evolution is that changes in catalytic and regulatory properties of PPDK were necessary for the enzyme to fulfil its role in the C(4) pathway...
May 2011: Journal of Experimental Botany
Hideo Mure, Shigeki Hirano, Chris C Tang, Ioannis U Isaias, Angelo Antonini, Yilong Ma, Vijay Dhawan, David Eidelberg
The circuit changes that mediate parkinsonian tremor, while likely differing from those underlying akinesia and rigidity, are not precisely known. In this study, to identify a specific metabolic brain network associated with this disease manifestation, we used FDG PET to scan nine tremor dominant Parkinson's disease (PD) patients at baseline and during ventral intermediate (Vim) thalamic nucleus deep brain stimulation (DBS). Ordinal trends canonical variates analysis (OrT/CVA) was performed on the within-subject scan data to detect a significant spatial covariance pattern with consistent changes in subject expression during stimulation-mediated tremor suppression...
January 15, 2011: NeuroImage
Chris C Tang, Kathleen L Poston, Vijay Dhawan, David Eidelberg
Imaging studies show that Parkinson's disease (PD) alters the activity of motor- and cognition-related metabolic brain networks. However, it is not known whether the network changes appear at or before symptom onset. In this study, we examined 15 hemiparkinsonian patients who underwent serial metabolic imaging with [(18)F]-fluorodeoxyglucose (FDG) PET at baseline and again 2.1 +/- 0.6 (mean +/- SD) and 3.9 +/- 0.7 years later. We assessed longitudinal changes in network activity in each cerebral hemisphere, focusing specifically on the "presymptomatic" hemisphere--ipsilateral to the initially involved body side...
January 20, 2010: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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