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https://www.readbyqxmd.com/read/29138672/testosterone-upregulates-the-expression-of-mitochondrial-nd1-and-nd4-and-alleviates-the-oxidative-damage-to-the-nigrostriatal-dopaminergic-system-in-orchiectomized-rats
#1
Wensheng Yan, Yunxiao Kang, Xiaoming Ji, Shuangcheng Li, Yingkun Li, Guoliang Zhang, Huixian Cui, Geming Shi
Testosterone deficiency, as a potential risk factor for aging and aging-related neurodegenerative disorders, might induce mitochondrial dysfunction and facilitate the declines of the nigrostriatal dopaminergic system by exacerbating the mitochondrial defects and increasing the oxidative damage. Thus, how testosterone levels influence the mitochondrial function in the substantia nigra was investigated in the study. The present studies showed that testosterone deficiency impaired the mitochondrial function in the substantia nigra and induced the oxidative damage to the substantia nigra as well as the deficits in the nigrostriatal dopaminergic system...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29138117/melatonin-protects-against-behavioral-deficits-dopamine-loss-and-oxidative-stress-in-homocysteine-model-of-parkinson-s-disease
#2
Rajib Paul, Banashree Chetia Phukan, Arokiasamy Justin Thenmozhi, Thamilarasan Manivasagam, Pallab Bhattacharya, Anupom Borah
AIM: Hyperhomocysteinemia and homocysteine (Hcy) mediated dopaminergic neurotoxicity is a matter of concern in the pathophysiology of Parkinson's disease (PD). Our previous study established the involvement of oxidative stress in the substantia nigra (SN) of Hcy rat model of PD; however, the role of antioxidants, such as melatonin, was not tested in this model. MAIN METHODS: Melatonin (10, 20 and 30mg/kg, i.p.) was administered to rats injected with Hcy in right SN (1...
November 11, 2017: Life Sciences
https://www.readbyqxmd.com/read/29137945/the-effects-of-local-microinjection-of-selective-dopamine-d1-and-d2-receptor-agonists-and-antagonists-into-the-dorsal-raphe-nucleus-on-sleep-and-wakefulness-in-the-rat
#3
Jaime M Monti, Héctor Jantos
The effects of the dopamine (DA) D1 and D2 receptor agonists SKF38393, bromocriptine and quinpirole, respectively, on spontaneous sleep were analyzed in adult rats prepared for chronic sleep recordings. Local administration of the DAergic agonists into the dorsal raphe nucleus (DRN) during the light phase of the light-dark cycle induced a significant reduction of rapid-eye movement sleep (REMS) and the number of REM periods. Additionally, bromocriptine and quinpirole significantly increased wakefulness (W)...
November 11, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29133763/effects-of-melatonin-levels-on-neurotoxicity-of-the-medial-prefrontal-cortex-in-a-rat-model-of-parkinson-s-disease
#4
Yan Li, Shu-Mei Wang, Lei Guo, Jian Zhu, Ying Wang, Lei Li, Yan-Xin Zhao
BACKGROUND: Damage of the medial prefrontal cortex (mPFC) results in similar characteristics to the cognitive deficiency seen with the progress of Parkinson's disease (PD). Since the course of mPFC damage is still unclear, our study aimed to investigate the effects of melatonin (MT) on neurotoxicity in the mPFC of a rat model of PD. METHODS: One hundred and fifty-four normal, male Wistar rats were randomly divided into the following five groups: normal + normal saline (NS), normal + 6-hydroxydopamine (6-OHDA), sham pinealectomy (PX) + 6-OHDA, PX + 6-OHDA, and MT + 6-OHDA...
November 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/29132545/nanoformulation-a-useful-therapeutic-strategy-for-improving-neuroprotection-and-the-neurorestorative-potential-in-experimental-models-of-parkinson-s-disease
#5
Jose V Lafuente, Catalina Requejo, Alejandro Carrasco, Harkaitz Bengoetxea
Parkinson's disease (PD) is the second most frequent neurodegenerative disorder, but current therapies are only symptomatic. Experimental models are necessary to go deeper in the comprehension of pathophysiological mechanism and to assess new therapeutic strategies. The unilateral 6-hydroxydopamine (6-OHDA) lesion either in medial forebrain bundle (MFB) or into the striatum in rats affords to study various stages of PD depending on the evolution time lapsed. A promising alternative to address the neurodegenerative process is the use of neurotrophic factors; but its clinical use has been limited due to its short half-life and rapid degradation after in vivo administration, along with difficulties for crossing the blood-brain barrier (BBB)...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/29132391/nadph-oxidases-in-parkinson-s-disease-a-systematic-review
#6
REVIEW
Karim Belarbi, Elodie Cuvelier, Alain Destée, Bernard Gressier, Marie-Christine Chartier-Harlin
Parkinson's disease (PD) is a progressive movement neurodegenerative disease associated with a loss of dopaminergic neurons in the substantia nigra of the brain. Oxidative stress, a condition that occurs due to imbalance in oxidant and antioxidant status, is thought to play an important role in dopaminergic neurotoxicity. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases are multi-subunit enzymatic complexes that generate reactive oxygen species as their primary function. Increased immunoreactivities for the NADPH oxidases catalytic subunits Nox1, Nox2 and Nox4 have been reported in the brain of PD patients...
November 13, 2017: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/29130486/rtp801-is-a-critical-factor-in-the-neurodegeneration-process-of-a53t-alpha-synuclein-in-a-mouse-model-of-parkinson-s-disease-under-chronic-restraint-stress
#7
Zhao Zhang, Shi-Feng Chu, Sha-Sha Wang, Yi-Na Jiang, Yan Gao, Peng-Fei Yang, Qi-Di Ai, Nai-Hong Chen
BACKGROUND AND PURPOSE: The incidence of Parkinson's disease exhibited a younger tendency in recent years with the constantly increased stressors of modern society, but this relationship remains obscured. We performed this study to investigate whether stress contributes to this tendency and identify the executor during this process. EXPERIMENTAL APPROACH: Ten-month-old α-synuclein A53T mice, a PD mice model, were treated with chronic restraint stress (CRS) to simulate a PD-sensitive person with constant stress stimulation...
November 11, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29128414/mapping-of-the-prenatal-and-postnatal-methamphetamine-effects-on-d1-like-dopamine-m1-and-m2-muscarinic-receptors-in-rat-central-nervous-system
#8
Vladimir Farar, Paulina Valuskova, Maria Sevcikova, Jaromir Myslivecek, Romana Slamberova
Methamphetamine (MA) is worldwide known drug with high potential for addiction that causes dopamine, noradrenaline and serotonin release. MA is also able to increase acetylcholine levels in adult rodents. The aim of this study was to map changes in D1-like dopamine receptors (DR), M1 and M2 muscarinic receptors (MR), and the total number of MR (M1-M5 MR) in the CNS of rats exposed to MA prenatally and in adulthood. Rat mothers were exposed to MA (5mg/kg s.c.) or saline during the entire gestation period and their male offspring were administered in adulthood with single MA (1mg/kg) or saline injection...
November 9, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/29128393/rem-sleep-deprivation-and-dopaminergic-d2-receptors-modulation-increase-recognition-memory-in-an-animal-model-of-parkinson-s-disease
#9
Adriano D S Targa, Ana Carolina D Noseda, Lais S Rodrigues, Mariana F Aurich, Marcelo M S Lima
Cognitive impairment is an important non-motor symptom of Parkinson's disease (PD). The neuronal death in nigrostriatal pathway is the main factor for motor symptoms and recent studies indicate a possible influence in non-motor symptoms as well. The pedunculopontine tegmental nucleus (PPT) and basal ganglia are closely related anatomically and functionally and, since they are affected by neurodegeneration in PD, they might be involved in recognition memory. To investigate this, we promoted an ibotenic acid lesion within the PPT or a rotenone lesion within substantia nigra pars compacta (SNpc) of Wistar rats, followed by 24h of REM sleep deprivation (REMSD)...
November 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29126932/docosahexaenoic-acid-dha-enhances-the-therapeutic-potential-of-neonatal-neural-stem-cell-transplantation-post-traumatic-brain-injury
#10
Hussein Ghazale, Naify Ramadan, Sara Mantash, Kazem Zibara, Sally El-Sitt, Hala Darwish, Farah Chamaa, Rose Mary Boustany, Stefania Mondello, Wassim Abou-Kheir, Jihane Soueid, Firas Kobeissy
Traumatic Brain Injury (TBI) is a major cause of death and disability worldwide with 1.5 million people inflicted yearly. Several neurotherapeutic interventions have been proposed including drug administration as well as cellular therapy involving neural stem cells (NSCs). Among the proposed drugs is docosahexaenoic acid (DHA), a polyunsaturated fatty acid, exhibiting neuroprotective properties. In this study, we utilized an innovative intervention of neonatal NSCs transplantation in combination with DHA injections in order to ameliorate brain damage and promote functional recovery in an experimental model of TBI...
November 7, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29115484/lipoic-acid-alleviates-l%C3%A2-dopa%C3%A2-induced-dyskinesia-in-6%C3%A2-ohda-parkinsonian-rats-via-anti%C3%A2-oxidative-stress
#11
Su-Fang Zhang, Cheng-Long Xie, Jing-Ya Lin, Mei-Hua Wang, Xi-Jin Wang, Zhen-Guo Liu
Levodopa (L‑DOPA) is the gold standard for symptomatic treatment of Parkinson's disease (PD); however, long‑term therapy is associated with the emergence of L‑DOPA‑induced dyskinesia (LID). Nigral dopaminergic cell loss determines the degree of drug exposure and time required for the initial onset of LID. Accumulating evidence indicates that α‑lipoic acid (ALA) decreases this nigral dopaminergic cell loss. However, until now, the precise mechanisms of ALA have only been partially understood in LID...
November 6, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29115479/overexpression-of-mir%C3%A2-185-inhibits-autophagy-and-apoptosis-of-dopaminergic-neurons-by-regulating-the-ampk-mtor-signaling-pathway-in-parkinson-s-disease
#12
Zhi Wen, Jie Zhang, Peng Tang, Ning Tu, Ke Wang, Guangyao Wu
Parkinson's disease (PD) is an age‑associated neurodegenerative disorder characterized by the death of dopaminergic neurons in the substantia nigra pars compacta. Activation of 5'‑adenosine monophosphate‑activated protein kinase (AMPK) has been suggested to be associated with PD pathogenesis. The aim of the present study was to investigate the effects of the aberrant expression of microRNA‑185 (miR‑185) in PD. A 1‑methyl‑4‑phenyl‑1,2,3,6‑tetrahydropyridine (MPTP)‑induced in vitro model of PD was generated using the human SH‑SY5Y dopaminergic neuroblastoma cell line, in order to examine the potential molecular mechanisms underlying the roles of miR‑185 in PD...
October 26, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29113897/long-lasting-effects-of-chronic-win55-212-2-treatment-on-mesostriatal-dopaminergic-and-cannabinoid-systems-in-the-rat-brain
#13
Panagiotis Perdikaris, Martha Tsarouchi, Eleni Fanarioti, Evangelos Natsaridis, Ada Mitsacos, Panagiotis Giompres
Cannabinoid administration modulates dopamine transmission via an indirect, multisynaptic mechanism that includes the activation of cannabinoid type-1 receptor (CB1R). The present study evaluated in rodents, the effects of acute and chronic (20 days) WIN55,212-2 administration, a non-selective CB1R agonist, on dopamine uptake and synthesis in the mesolimbic and nigrostriatal dopaminergic pathways and associate them to its effects on the endocannabinoid system. The effect of spontaneous withdrawal, after different abstinence periods (7 days, 20 days), was also assessed...
November 4, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29112723/in-vitro-and-in-vivo-studies-of-the-als-ftld-protein-chchd10-reveal-novel-mitochondrial-topology-and-protein-interactions
#14
S R Burstein, F Valsecchi, H Kawamata, M Bourens, R Zeng, A Zuberi, T A Milner, S M Cloonan, C Lutz, A Barrientos, G Manfredi
Mutations in coiled-coil-helix-coiled-coil-helix-domain containing 10 (CHCHD10), a mitochondrial twin CX9C protein whose function is still unknown, cause myopathy, motor neuron disease, frontotemporal dementia, and Parkinson's disease. Here, we investigate CHCHD10 topology and its protein interactome, as well as the effects of CHCHD10 depletion or expression of disease-associated mutations in wild-type cells. We find that CHCHD10 associates with membranes in the mitochondrial intermembrane space, where it interacts with a closely related protein, CHCHD2...
November 3, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/29111478/verbal-working-memory-and-functional-large-scale-networks-in-schizophrenia
#15
Maria R Dauvermann, Thomas Wj Moorhead, Andrew R Watson, Barbara Duff, Liana Romaniuk, Jeremy Hall, Neil Roberts, Graham L Lee, Zoë A Hughes, Nicholas J Brandon, Brandon Whitcher, Douglas Hr Blackwood, Andrew M McIntosh, Stephen M Lawrie
The aim of this study was to test whether bilinear and nonlinear effective connectivity (EC) measures of working memory fMRI data can differentiate between patients with schizophrenia (SZ) and healthy controls (HC). We applied bilinear and nonlinear Dynamic Causal Modeling (DCM) for the analysis of verbal working memory in 16 SZ and 21 HC. The connection strengths with nonlinear modulation between the dorsolateral prefrontal cortex (DLPFC) and the ventral tegmental area/substantia nigra (VTA/SN) were evaluated...
October 23, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/29111425/transcranial-sonographic-findings-may-predict-prognosis-of-gastroprokinetic-drug-induced-parkinsonism
#16
Yoon-Sang Oh, Do-Young Kwon, Joong-Seok Kim, Moon-Ho Park, Daniela Berg
BACKGROUND: Drug-induced parkinsonism (DIP) is one important cause of parkinsonism and a major cause of misleading diagnosis of Parkinson's disease (PD). DIP is caused by dopamine receptor blocking agents. Its symptoms will improve after withdrawal of offending drugs. However, parkinsonism does not regress in several individuals. It may persist or exacerbate despite drug withdrawal. Transcranial sonography (TCS) of the substantia nigra (SN) has been widely used to diagnose PD and differentiate parkinsonism types...
October 19, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29111022/association-of-freezing-of-gait-with-nigral-iron-accumulation-in-patients-with-parkinson-s-disease
#17
Rajini M Naduthota, Arush Arun Honnedevasthana, Abhishek Lenka, Jitender Saini, Sairam Geethanath, Rose Dawn Bharath, Rita Christopher, Ravi Yadav, Arun Kumar Gupta, Pramod Kumar Pal
BACKGROUND AND PURPOSE: The objective of this work was to investigate whether patients with and without freezing of gait (FOG) in Parkinson's disease (PD) have differences in iron accumulation in substantia nigra using R2* relaxometry. MATERIALS AND METHODS: This study included seventeen PD patients with FOG [FOG (+)], equal number of age and gender matched patients without FOG [FOG (-)] and 34 healthy controls (HC). T2* images were obtained from a 3-Tesla MRI system using multi-echo sequence...
November 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29110208/expression-of-gas1-in-mouse-brain-release-and-role-in-neuronal-differentiation
#18
Elizabeth Bautista, Natanael Zarco, Nicolás Aguirre-Pineda, Manuel Lara-Lozano, Paula Vergara, Juan Antonio González-Barrios, Raúl Aguilar-Roblero, José Segovia
Growth arrest-specific 1 (Gas1) is a pleiotropic protein that induces apoptosis of tumor cells and has important roles during development. Recently, the presence of two forms of Gas1 was reported: one attached to the cell membrane by a GPI anchor; and a soluble extracellular form shed by cells. Previously, we showed that Gas1 is expressed in different areas of the adult mouse CNS. Here, we report the levels of Gas1 mRNA protein in different regions and analyzed its expressions in glutamatergic, GABAergic, and dopaminergic neurons...
November 6, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/29107062/the-anti-aging-protein-klotho-alleviates-injury-of-nigrostriatal-dopaminergic-pathway-in-6-hydroxydopamine-rat-model-of-parkinson-s-disease-involvement-of-pka-camkii-creb-signaling
#19
Tourandokht Baluchnejadmojarad, Seyed-Mohammad Eftekhari, Nida Jamali-Raeufy, Sobhan Haghani, Hossein Zeinali, Mehrdad Roghani
Parkinson's disease (PD) is a prevalent movement disorder in the elderly. PD is hallmarked with progressive deterioration of mesencephalic dopaminergic neurons and development of debilitating motor and non-motor clinical symptoms. Klotho protein is the product of an aging-suppressor gene that its overexpression could protect neurons against oxidative injury. This study was undertaken to explore whether exogenous klotho could alleviate injury of nigrostriatal dopaminergic pathway in 6-hydroxydopamine (6-OHDA) rat model of PD...
October 31, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/29104779/the-spatial-organization-of-the-intranuclear-structures-of-human-brain-dopaminergic-neurons
#20
D E Korzhevskii, V V Gusel'nikova, O V Kirik, E G Sukhorukova, I P Grigorev
We studied the intranuclear localization of protein nucleophosmin (B23) and ubiquitin in the dopaminergic neurons of human substantia nigra (n = 6, age of 25-87 years) using immunohistochemistry and confocal laser microscopy. Intranuclear ubiquitin-immunopositive bodies that morphologically correspond to Marinesco bodies were found to be present in substantia nigra dopaminergic (tyrosine hydroxylase-immunopositive) neurons but absent in non-dopaminergic neurons. The number of bodies varied from 0 to 6 per cell nucleus...
July 2017: Acta Naturae
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