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https://www.readbyqxmd.com/read/28637176/dissociation-of-striatal-dopamine-and-tyrosine-hydroxylase-expression-from-aging-related-motor-decline-evidence-from-calorie-restriction-intervention
#1
Michael F Salvatore, Jennifer Terrebonne, Mark A Cantu, Tamara R McInnis, Katy Venable, Parker Kelley, Ella A Kasanga, Brian Latimer, Catherine L Owens, Brandon S Pruett, Yongmei Yu, Robert Luedtke, Michael J Forster, Nathalie Sumien, Donald K Ingram
The escalating increase in retirees living beyond their 8th decade brings increased prevalence of aging-related impairments, including locomotor impairment (Parkinsonism) which may affect ~50% of those reaching age 80, but has no confirmed neurobiological mechanism. Lifestyle strategies that attenuate motor decline, and its allied mechanisms, must be identified. Aging studies report little to moderate loss of striatal dopamine (DA) or tyrosine hydroxylase (TH) in nigrostriatal terminals, in contrast to ~70-80% loss associated with bradykinesia onset in Parkinson's disease...
June 20, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/28634107/chronic-pramipexole-treatment-induces-compulsive-behavior-in-rats-with-6-ohda-lesions-of-the-substantia-nigra-and-ventral-tegmental-area
#2
D Dardou, L Reyrolle, C Chassain, F Durif
Dopamine replacement therapy (DRT) reduces motor symptoms in Parkinson's disease (PD), but also induces impulsive-compulsive behavior (ICB) in up to 25% of PD patients. These non-motor side effects of DRT generally follow a gradual transition from impulsive to compulsive-like-i.e. repetitive, compelled, and non-pleasurable-behavior. Here, we investigated the effect of chronic pramipexole (PPX) treatment on the onset of compulsive-like behavior, measured via the post-training signal attenuation (PTSA) procedure, in rats with dopaminergic lesions...
June 17, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28633499/lateralized-basal-ganglia-vulnerability-to-pesticide-exposure-in-asymptomatic-agricultural-workers
#3
Mechelle M Lewis, Nicholas W Sterling, Guangwei Du, Eun-Young Lee, Grace Shyu, Michael Goldenberg, Thomas Allen, Christy Stetter, Lan Kong, Shedra Amy Snipes, Byron C Jones, Honglei Chen, Richard B Mailman, Xuemei Huang
Background: Pesticide exposure is linked to Parkinson's disease (PD), a neurodegenerative disorder marked by dopamine cell loss in the substantia nigra of the basal ganglia (BG) that often presents asymmetrically. We previously reported that pesticide-exposed agricultural workers (AW) have nigral diffusion tensor (DTI) changes. The current study sought to confirm this finding, and explore its hemisphere and regional specificity within BG structures using an independent sample population...
June 19, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28631404/structural-connectivity-differences-in-motor-network-between-tremor-dominant-and-nontremor-parkinson-s-disease
#4
Gaetano Barbagallo, Maria Eugenia Caligiuri, Gennarina Arabia, Andrea Cherubini, Angela Lupo, Rita Nisticò, Maria Salsone, Fabiana Novellino, Maurizio Morelli, Giuseppe Lucio Cascini, Domenico Galea, Aldo Quattrone
Motor phenotypes of Parkinson's disease (PD) are recognized to have different prognosis and therapeutic response, but the neural basis for this clinical heterogeneity remains largely unknown. The main aim of this study was to compare differences in structural connectivity metrics of the main motor network between tremor-dominant and nontremor PD phenotypes (TD-PD and NT-PD, respectively) using probabilistic tractography-based network analysis. A total of 63 PD patients (35 TD-PD patients and 28 NT-PD patients) and 30 healthy controls underwent a 3 T MRI...
June 20, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28631256/vulnerability-to-a-metabolic-challenge-following-perinatal-asphyxia-evaluated-by-organotypic-cultures-neonatal-nicotinamide-treatment
#5
R Perez-Lobos, C Lespay-Rebolledo, A Tapia-Bustos, E Palacios, V Vío, D Bustamante, P Morales, M Herrera-Marschitz
The hypothesis of enhanced vulnerability following perinatal asphyxia was investigated with a protocol combining in vivo and in vitro experiments. Asphyxia-exposed (AS) (by 21 min water immersion of foetuses containing uterine horns) and caesarean-delivered control (CS) rat neonates were used at P2-3 for preparing triple organotypic cultures (substantia nigra, neostriatum and neocortex). At DIV 18, cultures were exposed to different concentrations of H2O2 (0.25-45 mM), added to the culture medium for 18 h...
June 19, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28627590/activation-of-sonic-hedgehog-signal-by-purmorphamine-in-a-mouse-model-of-parkinson-s-disease-protects-dopaminergic-neurons-and-attenuates-inflammatory-response-by-mediating-pi3k-akt-signaling-pathway
#6
Shuai Shao, Guang-Liang Wang, Cespuglio Raymond, Xue-Hua Deng, Xiao-Lan Zhu, Di Wang, Le-Peng Hong
In Parkinson's disease (PD), microglial activation-mediated neuroinflammation is associated with dopaminergic neurons degeneration in the substantia nigra pars compacta. Previous studies that have investigated this neurodegenerative disease have reported that the Sonic hedgehog (SHH) signaling pathway, through inhibiting the inflammatory processes, exerts a beneficial neuroprotective effect. However, the mechanisms underlying the anti‑inflammatory and neuroprotective effects of this signaling pathway remain poorly understood...
June 9, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28626918/marinesco-bodies-and-substantia-nigra-neuron-density-in-parkinson-s-disease
#7
Robert D Abbott, James S Nelson, G Webster Ross, Jane H Uyehara-Lock, Caroline M Tanner, Kamal H Masaki, Lenore J Launer, Lon R White, Helen Petrovitch
AIM: Marinesco bodies (MB) are intranuclear inclusions in pigmented neurons of the substantia nigra (SN). While rare in children, frequency increases with normal aging and is high in Alzheimer's disease, dementia with Lewy bodies, and other neurodegenerative disorders. Coinciding with the age-related rise in MB frequency is initiation of cell death among SN neurons. Whether MB have a role in this process is unknown. Our aim is to examine the association of MB with SN neuron density in Parkinson's disease (PD) in the Honolulu-Asia Aging Study...
June 19, 2017: Neuropathology and Applied Neurobiology
https://www.readbyqxmd.com/read/28625719/atypical-dopamine-transporter-inhibitors-r-modafinil-and-jhw-007-differentially-affect-d2-autoreceptor-neurotransmission-and-the-firing-rate-of-midbrain-dopamine-neurons
#8
Alicia J Avelar, J Cao, Amy Hauck Newman, Michael J Beckstead
Abuse of psychostimulants like cocaine that inhibit dopamine (DA) reuptake through the dopamine transporter (DAT) represents a major public health issue, however FDA-approved pharmacotherapies have yet to be developed. Recently a class of ligands termed "atypical DAT inhibitors" has gained attention due to their range of effectiveness in increasing extracellular dopamine (DA) levels without demonstrating significant abuse liability. These compounds not only hold promise as therapeutic agents to treat stimulant use disorders but also as experimental tools to improve our understanding of DAT function...
June 15, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28625517/reduced-tdp-43-expression-improves-neuronal-activities-in-a-drosophila-model-of-perry-syndrome
#9
Yuka Hosaka, Tsuyoshi Inoshita, Kahori Shiba-Fukushima, Changxu Cui, Taku Arano, Yuzuru Imai, Nobutaka Hattori
Parkinsonian Perry syndrome, involving mutations in the dynein motor component dynactin or p150(Glued), is characterized by TDP-43 pathology in affected brain regions, including the substantia nigra. However, the molecular relationship between p150(Glued) and TDP-43 is largely unknown. Here, we report that a reduction in TDP-43 protein levels alleviates the synaptic defects of neurons expressing the Perry mutant p150(G50R) in Drosophila. Dopaminergic expression of p150(G50R), which decreases dopamine release, disrupts motor ability and reduces the lifespan of Drosophila...
June 8, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28624842/increased-levels-of-pro-inflammatory-and-anti-inflammatory-cellular-responses-in-parkinson-s-disease-patients-search-for-a-disease-indicator
#10
Likun Yang, Changfeng Guo, Jie Zhu, Yi Feng, Weiliang Chen, Zhizhong Feng, Dan Wang, Shibai Sun, Wei Lin, Yuhai Wang
BACKGROUND Parkinson's disease (PD) is the second most prevalent neurodegenerative disorder and it arises when most of the dopaminergic neurons of substantia nigra region die. Several mechanisms have been postulated as the causative event in PD pathology, and neuroinflammation is most crucial among them. MATERIAL AND METHODS We analyzed T-helper 17 (Th17) cells and myeloid-derived suppressor cells (MDSCs) from 80 PD patients to assess inflammatory processes and to find a cost-effective means to evaluate PD prognosis...
June 18, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28623510/the-implication-of-neuronimmunoendocrine-nie-modulatory-network-in-the-pathophysiologic-process-of-parkinson-s-disease
#11
REVIEW
Yan Shen, Xingfang Guo, Chao Han, Fang Wan, Kai Ma, Shiyi Guo, Luxi Wang, Yun Xia, Ling Liu, Zhicheng Lin, Jinsha Huang, Nian Xiong, Tao Wang
Parkinson's disease (PD) is a progressive neurodegenerative disorder implicitly marked by the substantia nigra dopaminergic neuron degeneration and explicitly characterized by the motor and non-motor symptom complexes. Apart from the nigrostriatal dopamine depletion, the immune and endocrine study findings are also frequently reported, which, in fact, have helped to broaden the symptom spectrum and better explain the pathogenesis and progression of PD. Nevertheless, based on the neural, immune, and endocrine findings presented above, it is still difficult to fully recapitulate the pathophysiologic process of PD...
June 16, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28623450/the-relationship-between-excitement-symptom-severity-and-extrastriatal-dopamine-d2-3-receptor-availability-in-patients-with-schizophrenia-a-high-resolution-pet-study-with-18-f-fallypride
#12
Yo-Han Joo, Jeong-Hee Kim, Young-Don Son, Hang-Keun Kim, Yeon-Jeong Shin, Sang-Yoon Lee, Jong-Hoon Kim
The purpose of this study was to investigate the relationship between specific symptom severity and D2/3 receptor availability in extrastriatal regions in outpatients with schizophrenia to shed light on the role of extrastriatal dopaminergic neurotransmission in the pathophysiology of symptoms of schizophrenia. Sixteen schizophrenia patients receiving relatively low-dose maintenance atypical antipsychotics and seventeen healthy controls underwent 3-Tesla magnetic resonance imaging and high-resolution positron emission tomography with [(18)F]fallypride...
June 16, 2017: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/28620826/individual-amino-acid-supplementation-can-improve-energy-metabolism-and-decrease-ros-production-in-neuronal-cells-overexpressing-alpha-synuclein
#13
Vedad Delic, Jeddidiah W D Griffin, Sandra Zivkovic, Yumeng Zhang, Tam-Anh Phan, Henry Gong, Dale Chaput, Christian Reynes, Vinh B Dinh, Josean Cruz, Eni Cvitkovic, Devon Placides, Ernide Frederic, Hamed Mirzaei, Stanley M Stevens, Umesh Jinwal, Daniel C Lee, Patrick C Bradshaw
Parkinson's disease (PD) is a neurodegenerative disorder characterized by alpha-synuclein accumulation and loss of dopaminergic neurons in the substantia nigra (SN) region of the brain. Increased levels of alpha-synuclein have been shown to result in loss of mitochondrial electron transport chain complex I activity leading to increased reactive oxygen species (ROS) production. WT alpha-synuclein was stably overexpressed in human BE(2)-M17 neuroblastoma cells resulting in increased levels of an alpha-synuclein multimer, but no increase in alpha-synuclein monomer levels...
June 15, 2017: Neuromolecular Medicine
https://www.readbyqxmd.com/read/28620296/testosterone-propionate-exacerbates-the-deficits-of-nigrostriatal-dopaminergic-system-and-downregulates-nrf2-expression-in-reserpine-treated-aged-male-rats
#14
Rui Cui, Yunxiao Kang, Li Wang, Shuangcheng Li, Xiaoming Ji, Wensheng Yan, Guoliang Zhang, Huixian Cui, Geming Shi
There is a controversy over the effects of testosterone supplements on dopaminergic function. Both neuroprotective and toxic effects of testosterone supplements are reported. The status of oxidative stress seems to explain the neuroprotective or toxic properties of testosterone. To determine the efficacy of testosterone supplements in different status of oxidative stress, the present studies analyzed the dopamine (DA)-related behaviors and neurochemical indices, as well as markers of nigrostriatal dopaminergic (NSDA) system in reserpine-treated aged male rats followed by testosterone propionate (TP) supplements...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28620274/influence-of-estrogen-modulation-on-glia-activation-in-a-murine-model-of-parkinson-s-disease
#15
Francesca Siani, Rosaria Greco, Giovanna Levandis, Cristina Ghezzi, Francesca Daviddi, Chiara Demartini, Elisabetta Vegeto, Marie-Thérèse Fuzzati-Armentero, Fabio Blandini
Epidemiological data suggest a sexual dimorphism in Parkinson disease (PD), with women showing lower risk of developing PD. Vulnerability of the nigrostriatal pathway may be influenced by exposure to estrogenic stimulation throughout fertile life. To further address this issue, we analyzed the progression of nigrostriatal damage, microglia and astrocyte activation and microglia polarization triggered by intrastriatal injection of dopaminergic neurotoxin 6-hydroxydopamine (6-OHDA) in male, female and ovariectomized (OVX) mice, as well as in OVX mice supplemented with 17βestradiol (OVX+E)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28619286/neuroprotective-potential-of-aloe-arborescens-against-copper-induced-neurobehavioral-features-of-parkinson-s-disease-in-rat
#16
Abdellatif Abbaoui, Omar El Hiba, Halima Gamrani
Copper (Cu) is an important trace element for the organism survival, which ensures the normal functioning of different biosystems. However, excessive levels of this heavy metal are responsible for profound physiological alterations including the central nervous system. Numerous findings sustain the involvement of heavy metals, as an environmental risk factor such as copper (Cu), in the neuropathology of Parkinson's disease (PD) which is a chronic neurodegenerative disorder that principally affects the motor system...
June 12, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/28619181/multifactorial-sleep-disturbance-in-parkinson-s-disease
#17
REVIEW
J Andrew Albers, Pratap Chand, A Michael Anch
Parkinson's disease (PD) is the second most common neurodegenerative disorder, ranking only behind Alzheimer's disease and affecting 2% of the population over the age of 65. Pathophysiologically, PD is characterized by selective degeneration of the dopaminergic neurons of the substantia nigra pars compacta (SNpc) and striatal dopamine depletion. Patients may also exhibit mild-to-severe degeneration of other central and peripheral nervous tissues. The most dramatic symptoms of the disease are profound dopamine-responsive motor disturbances, including bradykinesia, akinesia, rigidity, resting tremor, and postural instability...
July 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28617379/-immunohistochemical-characteristics-of-the-substantia-nigra-neurons-of-the-human
#18
D E Korzhevskii, I P Grigor'ev, E G Sukhorukova, V V Gusel'nikova
AIM: To determine the cytochemical characteristics of unchanged neurons of the human substantia nigra using a wide range of immunocytochemical markers some of which (glutamate decarboxylase-65, PGP 9.5, non-phosphorylated neurofilament proteins, alpa-tubulin) have never been used for study of human dopaminergic neurons. MATERIAL AND METHODS: Fragments of human midbrain (17 men and women, aged from 28 to 78 years) from the archives of the Department of General and Specific Morphology of the Institute of Experimental Medicine were used...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28616718/effect-of-intrastriatal-6-ohda-lesions-on-extrastriatal-brain-structures-in-the-mouse
#19
Birte Becker, Melek Demirbas, Sonja Johann, Adib Zendedel, Cordian Beyer, Hans Clusmann, Stefan Jean-Pierre Haas, Andreas Wree, Sonny Kian Hwie Tan, Markus Kipp
Parkinson's disease (PD) is a neurodegenerative disorder characterized by progressive loss of midbrain dopaminergic neurons, resulting in motor and non-motor symptoms. The underlying pathology of non-motor symptoms is poorly understood. Discussed are pathological changes of extrastriatal brain structures. In this study, we characterized histopathological alterations of extrastriatal brain structures in the 6-hydroxydopamine (6-OHDA) PD animal model. Lesions were induced by unilateral stereotactic injections of 6-OHDA into the striatum or medial forebrain bundle of adult male mice...
June 14, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28615430/characterization-of-patients-with-longstanding-idiopathic-rem-sleep-behavior-disorder
#20
Alex Iranzo, Ambra Stefani, Monica Serradell, Maria Jose Martí, Francisco Lomeña, Philipp Mahlknecht, Heike Stockner, Carles Gaig, Ana Fernández-Arcos, Werner Poewe, Eduard Tolosa, Birgit Högl, Joan Santamaria
OBJECTIVE: To evaluate the presence of prodromal markers of Parkinson disease (PD) in patients with longstanding idiopathic REM sleep behavior disorder (IRBD), a small subgroup of individuals with IRBD with long-term follow-up thought not to be at risk of developing PD. METHODS: Demographic, clinical, and neuroimaging markers of PD were evaluated in 20 patients with polysomnographic-confirmed long-standing IRBD and in 32 matched controls. RESULTS: Patients were 16 men and 4 women with mean age of 72...
June 14, 2017: Neurology
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