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https://www.readbyqxmd.com/read/28338593/clinical-correlates-to-assist-with-cte-diagnosis-insights-from-a-novel-rodent-repeat-concussion-model
#1
Gretchen M Thomsen, Ara Ko, Megan Y Harada, Annie Ma, Livia Wyss, Patricia Haro, Jean-Philippe Vit, Pablo Avalos, Navpreet Dhillon, Noell Cho, Oksana Shelest, Eric J Ley
INTRODUCTION: Chronic traumatic encephalopathy (CTE) is a neurodegenerative disease linked to repetitive head injuries. CTE symptoms include changes in mood, behavior, cognition and motor function, however CTE is only currently diagnosed post-mortem. Using a rat model of recurrent traumatic brain injury (TBI) we demonstrate rodent deficits that predict the severity of CTE-like brain pathology. METHODS: Bilateral, closed skull, mild TBI was administered once per week to 35 WT rats, 8 rats received 2 injuries ('2xTBI'), 27 rats received 5 injuries ('5xTBI') and 13 rats were sham controls...
March 23, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28335684/bone-marrow-derived-endothelial-progenitor-cell-treatment-in-a-model-of-lateral-fluid-percussion-injury-in-rats-evaluation-of-acute-and-subacute-outcome-measures
#2
Eugene Park, Katya J Park, Elaine Liu, Rongcai Jiang, Jian-Ning Zhang, Andrew J Baker
Traumatic brain injury (TBI) continues to be a serious healthcare issue while therapies to treat TBI remain elusive. Promising results from the use of endothelial progenitor cells (EPCs) in numerous disease states highlight the pleiotropic capacity of this cell type. We have previously demonstrated that EPC conditioned media reduces axonal degeneration following in vitro OGD insult and concurrently improves white matter and microvascular outcome in vivo following midline fluid percussion injury. In the current study we evaluated the effectiveness of allogeneic endothelial cells derived from rat bone marrow on microvascular recovery and neuronal sparing following lateral fluid percussion injury...
March 23, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28330826/the-influence-of-methamphetamine-on-maternal-behavior-and-development-of-the-pups-during-the-neonatal-period
#3
Mária Ševčíková, Ivana Hrebíčková, Eva Macúchová, Romana Šlamberová
Since it enters breast milk, methamphetamine (MA) abuse during lactation can not only affect the quality of maternal behavior but also postnatal development of pups. The aim of the present study was to examine the effect of injected MA (5mg/kg) on maternal behavior of rats and the differences in postnatal development, during postnatal days (PD) 1-11, of pups when the pups were directly exposed (i.e., injected) to MA or received MA indirectly via breast milk. Maternal behavior was examined using observation test (PD 1-22) and pup retrieval test (PD 1-12)...
March 18, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/28329224/a-clinically-relevant-frailty-index-for-aging-rats
#4
Marshall G Miller, Nopporn Thangthaeng, Barbara Shukitt-Hale
Frailty is a clinical syndrome that is increasingly prevalent during aging. Frailty involves the confluence of reduced strength, speed, physical activity, and endurance and is associated with adverse health outcomes. The present study adapts existing clinical and preclinical indices of frailty to the Fischer (F344) rat. Male F344 rats (n = 133; 17 mo) completed a battery of behavioral tasks, including forelimb wire suspension (strength), rotarod (speed), open field (physical activity), and inclined screen (endurance)...
January 21, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28326933/attenuation-of-hyperalgesia-responses-via-the-modulation-of-5-hydroxytryptamine-signalings-in-the-rostral-ventromedial-medulla-and-spinal-cord-in-a-6-hydroxydopamine-induced-rat-model-of-parkinson-s-disease
#5
Chen-Tao Wang, Cheng-Jie Mao, Xiao-Qi Zhang, Cai-Yi Zhang, Dong-Jun Lv, Ya-Ping Yang, Kai-Lin Xia, Jun-Yi Liu, Fen Wang, Li-Fang Hu, Guang-Yin Xu, Chun-Feng Liu
Background Although pain is one of the most distressing non-motor symptoms among patients with Parkinson's disease, the underlying mechanisms of pain in Parkinson's disease remain elusive. The aim of the present study was to investigate the role of serotonin (5-hydroxytryptamine) in the rostral ventromedial medulla (RVM) and spinal cord in pain sensory abnormalities in a 6-hydroxydopamine-treated rat model of Parkinson's disease. Methods The rotarod test was used to evaluate motor function. The radiant heat test and von Frey test were conducted to evaluate thermal and mechanical pain thresholds, respectively...
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28326165/neurochemical-and-motor-changes-in-mice-with-combined-mutations-linked-to-parkinson-s-disease
#6
Xiang Bai, Margaret Chia-Ying Wey, Paul Anthony Martinez, Chao Shi, Elizabeth Fernandez, Randy Strong
Considerable evidence suggests that oxidative stress plays a role in the pathogenesis of Parkinson's disease (PD), the most prevalent neurodegenerative movement disorder. Reduced expression of aldehyde dehydrogenase-1 (ALDH1) and glutathione peroxidase-1 (GPX1), enzymes that function to detoxify aldehydes and hydroxyl radicals, respectively, has been reported in the substantia nigra of patients who died with PD. To determine whether deficiency in these two genes contributes to the pathogenesis of PD, mice were generated with homozygous null mutations of both Aldh1a1 (the murine homolog of ALDH1) and Gpx1 genes [knockout (KO) mice]...
2017: Pathobiology of Aging & Age related Diseases
https://www.readbyqxmd.com/read/28321769/n-propargyl-caffeamide-paca-ameliorates-dopaminergic-neuronal-loss-and-motor-dysfunctions-in-mptp-mouse-model-of-parkinson-s-disease-and-in-mpp-induced-neurons-via-promoting-the-conversion-of-prongf-to-ngf
#7
Dan Luo, Jia Zhao, Yuanyuan Cheng, Simon Ming-Yuen Lee, Jianhui Rong
Insufficient production of nerve growth factor (NGF) is implicated in Parkinson's disease (PD). We recently discovered that caffeic acid derivative N-propargyl caffeamide (PACA) not only potentiated NGF-induced neurite outgrowth but also attenuated 6-hydroxydopamine neurotoxicity in neuronal culture. The aim of the present study was to investigate whether PACA could increase NGF levels against 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP) neurotoxicity in a mouse PD model. We induced parkinsonism in mice by intraperitoneal injection of MPTP for seven consecutive days...
March 21, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28320887/hip-region-muscular-dystrophy-and-emergence-of-motor-deficits-in-dysferlin-deficient-bla-j-mice
#8
Nadia Nagy, Randal J Nonneman, Telmo Llanga, Catherine F Dial, Natallia V Riddick, Tom Hampton, Sheryl S Moy, Kimmo K Lehtimäki, Toni Ahtoniemi, Jukka Puoliväli, Hillarie Windish, Douglas Albrecht, Isabelle Richard, Matthew L Hirsch
The identification of a dysferlin-deficient animal model that accurately displays both the physiological and behavior aspects of human dysferlinopathy is critical for the evaluation of potential therapeutics. Disease progression in dysferlin-deficient mice is relatively mild, compared to the debilitating human disease which manifests in impairment of particular motor functions. Since there are no other known models of dysferlinopathy in other species, locomotor proficiency and muscular anatomy through MRI (both lower leg and hip region) were evaluated in dysferlin-deficient B6...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28318734/effects-of-acetone-cyanohydrin-a-derivative-of-cassava-on-motor-activity-and-kidney-and-liver-function-in-wistar-rats
#9
E Rivadeneyra-Domínguez, C J Rosas-Jarquín, A Vázquez-Luna, R Díaz-Sobac, J F Rodríguez-Landa
INTRODUCTION: Acetone cyanohydrin (ACH) is a toxic substance present in cassava roots (Manihot esculenta Crantz) which results from enzymatic hydrolysis of linamarin. Long-term consumption is associated with 2 neurological disorders: konzo and tropical ataxic neuropathy. Previous studies have evaluated behavioural alterations linked to ACH consumption, but the toxic effects of this substance on physiological processes remain unknown. METHOD: 32 male Wistar rats were assigned to 4 experimental groups (n=8 per group): a vehicle group (0...
March 16, 2017: Neurología: Publicación Oficial de la Sociedad Española de Neurología
https://www.readbyqxmd.com/read/28317156/synthesis-and-anticonvulsant-properties-of-new-3-3-diphenyl-2-5-dioxo-pyrrolidin-1-yl-acetamides-and-3-3-diphenyl-propionamides
#10
Jolanta Obniska, Anna Rapacz, Sabina Rybka, Małgorzata Góra, Paweł Żmudzki, Krzysztof Kamiński
The focused library of new amides derived from 3,3-diphenyl-2,5-dioxo-pyrrolidin-1-yl-acetic acid (2a-t) and 3,3-diphenyl-propionic acid (3a-t) as potential anticonvulsant agents was synthesized. The final products were obtained in the amidation reaction of the given carboxylic acid (2, 3) with appropriate secondary amines in the presence of carbonyldiimidazole (CDI) as a coupling reagent. The initial anticonvulsant screening was performed in mice intraperitoneally (i.p.) using the "classical" maximal electroshock (MES) and subcutaneous pentylenetetrazole (scPTZ) seizure models, whereas the acute neurological toxicity was determined applying the rotarod test...
March 20, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28315465/early-preclinical-evaluation-of-dihydropyrimidin-thi-ones-as-potential-anticonvulsant-drug-candidates
#11
Mariana Matias, Gonçalo Campos, Samuel Silvestre, Amílcar Falcão, Gilberto Alves
Although significant advances are occurring in epilepsy research, about 30% of epileptic patients are still inadequately controlled by standard drug therapy. For this reason, it continues to be important to develop new chemical entities through which epilepsy could be effectively controlled. In this study, the anticonvulsant activity of forty-two dihydropyrimidin(thi)ones was explored and their efficacy was evaluated in rodents against the maximal electroshock seizure (MES) and subcutaneous pentylenetetrazole tests...
March 14, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28288867/moderate-traumatic-brain-injury-increases-the-vulnerability-to-neurotoxicity-induced-by-systemic-administration-of-6-hydroxydopamine-in-mice
#12
Paulo Alexandre de Oliveira, Juliana Ben, Filipe Carvalho Matheus, Marcelo Liborio Schwarzbold, Eduardo Luiz Gasnhar Moreira, Daniel Rial, Roger Walz, Rui Daniel Prediger
Moderate traumatic brain injury (TBI) might increase the vulnerability to neuronal neurodegeneration, but the basis of such selective neuronal susceptibility has remained elusive. In keeping with the disruption of the blood-brain barrier (BBB) caused by TBI, changes in BBB permeability following brain injury could facilitate the access of xenobiotics into the brain. To test this hypothesis, here we evaluated whether TBI would increase the susceptibility of nigrostriatal dopaminergic fibers to the systemic administration of 6-hydroxydopamine (6-OHDA), a classic neurotoxin used to trigger a PD-like phenotype in mice, but that in normal conditions is unable to cross the BBB...
March 10, 2017: Brain Research
https://www.readbyqxmd.com/read/28285942/small-molecule-inhibitors-of-psd95-nnos-protein-protein-interactions-suppress-formalin-evoked-fos-protein-expression-and-nociceptive-behavior-in-rats
#13
Lawrence M Carey, Wan-Hung Lee, Tannia Gutierrez, Pushkar M Kulkarni, Ganesh A Thakur, Yvonne Y Lai, Andrea G Hohmann
Excessive activation of NMDA receptor (NMDAR) signaling within the spinal dorsal horn contributes to central sensitization and the induction and maintenance of pathological pain states. However, direct antagonism of NMDARs produces undesirable side effects which limit their clinical use. NMDAR activation produces central sensitization, in part, by initiating a signaling cascade that activates the enzyme neuronal nitric oxide synthase (nNOS) and generates the signaling molecule nitric oxide (NO). NMDAR-mediated activation of nNOS requires a scaffolding protein, postsynaptic density protein 95 kDa (PSD95), which tethers nNOS to NMDARs...
March 7, 2017: Neuroscience
https://www.readbyqxmd.com/read/28275341/risk-assessment-of-neonatal-exposure-to-low-frequency-noise-based-on-balance-in-mice
#14
Nobutaka Ohgami, Reina Oshino, Hiromasa Ninomiya, Xiang Li, Masashi Kato, Ichiro Yajima, Masashi Kato
General electric devices and ventilation systems are known to generate low frequency noise (LFN) with frequencies of <100 Hz. Previous studies showed that exposure to LFN caused impairments of balance in humans and mice during adulthood. On the other hand, a previous study showed that noise levels in the neonatal intensive care unit (NICU) were greater than those in general home or office environments. Therefore, it is possible that neonates have a potential risk to be exposed to LFN in the NICU. However, the risk of neonatal exposure to LFN remains unclear in humans and mice...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28273662/dedifferentiated-fat-cells-as-a-novel-source-for-cell-therapy-to-target-neonatal-hypoxic-ischemic-encephalopathy
#15
Alkisti Mikrogeorgiou, Yoshiaki Sato, Taiki Kondo, Tetsuo Hattori, Yuichiro Sugiyama, Miharu Ito, Akiko Saito, Keiko Nakanishi, Masahiro Tsuji, Tomohiko Kazama, Koichiro Kano, Taro Matsumoto, Masahiro Hayakawa
Neonatal hypoxic-ischemic (HI) encephalopathy (HIE) remains a major cause of mortality and persistent neurological disabilities in affected individuals. At present, hypothermia is considered to be the only applicable treatment option, although growing evidence suggests that cell-based therapy might achieve better outcomes. Dedifferentiated fat (DFAT) cells are derived from mature adipocytes via a dedifferentiation strategy called ceiling culture. Their abundance and ready availability might make them an ideal therapeutic tool for the treatment of HIE...
March 9, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28253997/cb2-cannabinoid-receptors-modulate-hif-1%C3%AE-and-tim-3-expression-in-a-hypoxia-ischemia-mouse-model
#16
Elk Kossatz, Rafael Maldonado, Patricia Robledo
The role of CB2 cannabinoid receptors (CB2R) in global brain lesions induced by hypoxia-ischemia (HI) insult is still unresolved. The aim of this study was to evaluate the involvement of CB2R in the behavioural and biochemical underpinnings related to brain damage induced by HI in adult mice, and the mechanisms involved. CB2R knockout (KO) mice and wild-type littermates (WT) underwent permanent ligation of the left common carotid artery and hypoxia. Behavioural measurements in the rotarod, beam walking, object recognition, open field, and Irwin tests were carried out 24h, 72h and 7 days...
December 2016: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28249117/anti-inflammatory-and-neuroprotective-activity-of-boswellic-acids-in-rotenone-parkinsonian-rats
#17
Angie Ameen, Amany Elkazaz, Hala M F A Mohammad, Bassant Mohamed Barakat
There is evidence that inflammation and oxidative stress contribute to neurodegenerative changes observed in Parkinson's disease (PD). Unfortunately, there is a lack of curative treatments for this debilitating movement disorder. Boswellic acids (BAs) are pentacyclic triterpene molecules of plant origin and have been utilized for treating many inflammatory conditions. The current study was conducted to explore the role of BAs in protection from rotenone-induced experimental Parkinsonism. Twenty four rats were assigned as vehicle group, rotenone control group: rats received rotenone (1 mg/kg) every 48...
March 1, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28243167/effect-of-single-and-double-administration-of-human-umbilical-cord-blood-derived-mesenchymal-stem-cells-following-focal-cerebral-ischemia-in-rats
#18
Hyung Woo Park, Yona Kim, Jong Wook Chang, Yoon Sun Yang, Wonil Oh, Jae Min Lee, Hye Ran Park, Dong Gyu Kim, Sun Ha Paek
Stem cell therapies are administered during the acute phase of stroke to preserve the penumbral tissues from ischemic injury. However, the effect of repeated cell therapy during the acute phase remains unclear. In this study, we investigated and compared the functional outcome of single (two days post-injury) and repeated (two and nine days post-injury) treatment with human umbilical cord derived mesenchymal stem cells (hUCB-MSCs) after middle cerebral artery occlusion (MCAO). The rotarod and limb placement tests were utilized to investigate functional outcomes, while infarct volume and tissue damage were measured by immunofluorescent staining for neovascularization, neurogenesis, apoptosis, and inflammation in the penumbral zones...
February 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/28229532/n-butylidenephthalide-treatment-prolongs-life-span-and-attenuates-motor-neuron-loss-in-sod1-g93a-mouse-model-of-amyotrophic-lateral-sclerosis
#19
Qin-Ming Zhou, Jing-Jing Zhang, Song Li, Sheng Chen, Wei-Dong Le
AIMS: To evaluate the therapeutic effects of n-butylidenephthalide (BP) in SOD1(G93A) mouse model of amyotrophic lateral sclerosis and explore the possible mechanisms. METHODS: The SOD1(G93A) mice were treated by oral administration of BP (q.d., 400 mg/kg d) starting from 60 days of age and continuing until death. The rotarod test was performed to assess the disease onset. The expression levels of apoptosis-related proteins, inflammatory molecules, and autophagy-associated proteins were determined...
February 22, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28223295/a-model-of-chronic-diabetic-polyneuropathy-benefits-from-intranasal-insulin-are-modified-by-sex-and-rage-deletion
#20
Cristiane L de la Hoz, Chu Cheng, Paul Fernyhough, Douglas W Zochodne
Human diabetic polyneuropathy (DPN) is a progressive complication of chronic diabetes mellitus. Preliminary evidence has suggested that intranasal insulin, in doses insufficient to alter hyperglycemia, suppresses the development of DPN. In this work we confirm this finding, but demonstrate that its impact is modified by sex and deletion of RAGE, the receptor for advanced glycosylation endproducts. We serially evaluated experimental DPN in male and female wild type mice and male RAGE null (RN) mice, each with nondiabetic controls, during 16 weeks of diabetes, the final 8 weeks including groups given intranasal insulin...
February 21, 2017: American Journal of Physiology. Endocrinology and Metabolism
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