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Cheng G, Hardy M, Hillard CJ, Feix JB, Kalyanaraman B. Mitigating gut microbial degradation of levodopa and enhancing brain dopamine: Implications in Parkinson's disease. Commun Biol 2024; 7:668. [PMID: 38816577 PMCID: PMC11139878 DOI: 10.1038/s42003-024-06330-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 05/14/2024] [Indexed: 06/01/2024] Open
Abstract
Parkinson's disease is managed using levodopa; however, as Parkinson's disease progresses, patients require increased doses of levodopa, which can cause undesirable side effects. Additionally, the oral bioavailability of levodopa decreases in Parkinson's disease patients due to the increased metabolism of levodopa to dopamine by gut bacteria, Enterococcus faecalis, resulting in decreased neuronal uptake and dopamine formation. Parkinson's disease patients have varying levels of these bacteria. Thus, decreasing bacterial metabolism is a promising therapeutic approach to enhance the bioavailability of levodopa in the brain. In this work, we show that Mito-ortho-HNK, formed by modification of a naturally occurring molecule, honokiol, conjugated to a triphenylphosphonium moiety, mitigates the metabolism of levodopa-alone or combined with carbidopa-to dopamine. Mito-ortho-HNK suppresses the growth of E. faecalis, decreases dopamine levels in the gut, and increases dopamine levels in the brain. Mitigating the gut bacterial metabolism of levodopa as shown here could enhance its efficacy.
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Affiliation(s)
- Gang Cheng
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA
| | - Micael Hardy
- Aix-Marseille Univ, CNRS, ICR, UMR 7273, Marseille, 13013, France
| | - Cecilia J Hillard
- Department of Pharmacology and Toxicology and Neuroscience Research Center, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA
| | - Jimmy B Feix
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA
| | - Balaraman Kalyanaraman
- Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA.
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2
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Li Y, Vora LK, Wang J, Sabri AHB, Graham A, McCarthy HO, Donnelly RF. Poly(acrylic acid)/Poly(vinyl alcohol) Microarray Patches for Continuous Transdermal Delivery of Levodopa and Carbidopa: In Vitro and In Vivo Studies. Pharmaceutics 2024; 16:676. [PMID: 38794339 PMCID: PMC11125810 DOI: 10.3390/pharmaceutics16050676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 05/13/2024] [Accepted: 05/15/2024] [Indexed: 05/26/2024] Open
Abstract
Levodopa (LD) has been the most efficacious medication and the gold standard therapy for Parkinson's disease (PD) for decades. However, its long-term administration is usually associated with motor complications, which are believed to be the result of the fluctuating pharmacokinetics of LD following oral administration. Duodopa® is the current option to offer a continuous delivery of LD and its decarboxylase inhibitor carbidopa (CD); however, its administration involves invasive surgical procedures, which could potentially lead to lifelong complications, such as infection. Recently, dissolving microarray patches (MAPs) have come to the fore as an alternative that can bypass the oral administration route in a minimally invasive way. This work explored the potential of using dissolving MAPs to deliver LD and CD across the skin. An acidic polymer poly(acrylic acid) (PAA) was used in the MAP fabrication to prevent the potential oxidation of LD at neutral pH. The drug contents of LD and CD in the formulated dissolving MAPs were 1.82 ± 0.24 and 0.47 ± 0.04 mg/patch, respectively. The in vivo pharmacokinetic study using female Sprague-Dawley® rats (Envigo RMS Holding Corp, Bicester, UK) demonstrated a simultaneous delivery of LD and CD and comparable AUC values between the dissolving MAPs and the oral LD/CD suspension. The relative bioavailability for the dissolving MAPs was calculated to be approximately 37.22%. Accordingly, this work highlights the use of dissolving MAPs as a minimally invasive approach which could potentially bypass the gastrointestinal pathway and deliver both drugs continuously without surgery.
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Affiliation(s)
| | | | | | | | | | | | - Ryan F. Donnelly
- School of Pharmacy, Queen’s University Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (Y.L.); (L.K.V.); (J.W.); (A.H.B.S.); (A.G.); (H.O.M.)
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3
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Tichelaar JG, Sayalı C, Helmich RC, Cools R. Impulse control disorder in Parkinson's disease is associated with abnormal frontal value signalling. Brain 2023; 146:3676-3689. [PMID: 37192341 PMCID: PMC10473575 DOI: 10.1093/brain/awad162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 04/18/2023] [Accepted: 04/26/2023] [Indexed: 05/18/2023] Open
Abstract
Dopaminergic medication is well established to boost reward- versus punishment-based learning in Parkinson's disease. However, there is tremendous variability in dopaminergic medication effects across different individuals, with some patients exhibiting much greater cognitive sensitivity to medication than others. We aimed to unravel the mechanisms underlying this individual variability in a large heterogeneous sample of early-stage patients with Parkinson's disease as a function of comorbid neuropsychiatric symptomatology, in particular impulse control disorders and depression. One hundred and ninety-nine patients with Parkinson's disease (138 ON medication and 61 OFF medication) and 59 healthy controls were scanned with functional MRI while they performed an established probabilistic instrumental learning task. Reinforcement learning model-based analyses revealed medication group differences in learning from gains versus losses, but only in patients with impulse control disorders. Furthermore, expected-value related brain signalling in the ventromedial prefrontal cortex was increased in patients with impulse control disorders ON medication compared with those OFF medication, while striatal reward prediction error signalling remained unaltered. These data substantiate the hypothesis that dopamine's effects on reinforcement learning in Parkinson's disease vary with individual differences in comorbid impulse control disorder and suggest they reflect deficient computation of value in medial frontal cortex, rather than deficient reward prediction error signalling in striatum. See Michael Browning (https://doi.org/10.1093/brain/awad248) for a scientific commentary on this article.
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Affiliation(s)
- Jorryt G Tichelaar
- Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Centre for Cognitive Neuroimaging, 6525EN Nijmegen, The Netherlands
- Radboud University Medical Center, Department of Neurology, Centre of Expertise for Parkinson and Movement Disorders, 6525GA Nijmegen, The Netherlands
| | - Ceyda Sayalı
- The Johns Hopkins University School of Medicine, Center for Psychedelic and Consciousness Research, Baltimore, MD 21224, USA
| | - Rick C Helmich
- Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Centre for Cognitive Neuroimaging, 6525EN Nijmegen, The Netherlands
- Radboud University Medical Center, Department of Neurology, Centre of Expertise for Parkinson and Movement Disorders, 6525GA Nijmegen, The Netherlands
| | - Roshan Cools
- Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Centre for Cognitive Neuroimaging, 6525EN Nijmegen, The Netherlands
- Radboud University Medical Center, Department of Psychiatry, 6525GA Nijmegen, The Netherlands
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4
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Juza R, Musilek K, Mezeiova E, Soukup O, Korabecny J. Recent advances in dopamine D 2 receptor ligands in the treatment of neuropsychiatric disorders. Med Res Rev 2023; 43:55-211. [PMID: 36111795 DOI: 10.1002/med.21923] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 07/29/2022] [Accepted: 08/09/2022] [Indexed: 02/04/2023]
Abstract
Dopamine is a biologically active amine synthesized in the central and peripheral nervous system. This biogenic monoamine acts by activating five types of dopamine receptors (D1-5 Rs), which belong to the G protein-coupled receptor family. Antagonists and partial agonists of D2 Rs are used to treat schizophrenia, Parkinson's disease, depression, and anxiety. The typical pharmacophore with high D2 R affinity comprises four main areas, namely aromatic moiety, cyclic amine, central linker and aromatic/heteroaromatic lipophilic fragment. From the literature reviewed herein, we can conclude that 4-(2,3-dichlorophenyl), 4-(2-methoxyphenyl)-, 4-(benzo[b]thiophen-4-yl)-1-substituted piperazine, and 4-(6-fluorobenzo[d]isoxazol-3-yl)piperidine moieties are critical for high D2 R affinity. Four to six atoms chains are optimal for D2 R affinity with 4-butoxyl as the most pronounced one. The bicyclic aromatic/heteroaromatic systems are most frequently occurring as lipophilic appendages to retain high D2 R affinity. In this review, we provide a thorough overview of the therapeutic potential of D2 R modulators in the treatment of the aforementioned disorders. In addition, this review summarizes current knowledge about these diseases, with a focus on the dopaminergic pathway underlying these pathologies. Major attention is paid to the structure, function, and pharmacology of novel D2 R ligands, which have been developed in the last decade (2010-2021), and belong to the 1,4-disubstituted aromatic cyclic amine group. Due to the abundance of data, allosteric D2 R ligands and D2 R modulators from patents are not discussed in this review.
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Affiliation(s)
- Radomir Juza
- Experimental Neurobiology, National Institute of Mental Health, Klecany, Czech Republic.,Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Kamil Musilek
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech Republic.,Biomedical Research Centre, University Hospital Hradec Kralove, Hradec Kralove, Czech Republic
| | - Eva Mezeiova
- Experimental Neurobiology, National Institute of Mental Health, Klecany, Czech Republic.,Biomedical Research Centre, University Hospital Hradec Kralove, Hradec Kralove, Czech Republic
| | - Ondrej Soukup
- Biomedical Research Centre, University Hospital Hradec Kralove, Hradec Kralove, Czech Republic
| | - Jan Korabecny
- Experimental Neurobiology, National Institute of Mental Health, Klecany, Czech Republic.,Biomedical Research Centre, University Hospital Hradec Kralove, Hradec Kralove, Czech Republic
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5
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Zhu J, Chen L. LincRNA-p21 Promotes Cellular Senescence by Down-regulating the Wnt/β-catenin Pathway in MPP +-treated SH-SY5Y Cells. Comb Chem High Throughput Screen 2023; 26:2476-2486. [PMID: 37073660 PMCID: PMC10556404 DOI: 10.2174/1386207326666230417103137] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 01/30/2023] [Accepted: 02/09/2023] [Indexed: 04/20/2023]
Abstract
AIM AND OBJECTIVE Long intergenic non-coding RNA-p21 (lincRNA-p21) plays a critical role in various senescence-associated physiological and pathological conditions. We aimed to explore the senescence-associated effects of lincRNA-p21 in 1-methyl-4-phenylpyridinium (MPP+) treated neuroblastoma SH-SY5Y cell line as a therapeutic target. MATERIALS AND METHODS The RNA expression levels of lincRNA-p21, p53, p16, and telomere length were examined with reverse transcription-quantitative polymerase chain reaction (RTqPCR). The Telo TAGGG™ Telomerase PCR ELISA PLUS Kit was used to determine telomerase activity. Cellular viability was evaluated with the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and lactate dehydrogenase (LDH) assay. Western blot was performed to analyze β-catenin protein expression. Besides, oxidative stress was evaluated by Jaggregate- forming delocalized lipophilic cation, 5,5',6,6'-tetrachloro-1,1',3,3'- tetraethylbenzimidazolocarbocyanine++ + iodide (JC‑1) stain, fluorescence spectrophotometry, colorimetric assay, and malondialdehyde (MDA) formation. RESULTS This research demonstrated that MPP+ caused a distinct increase in the expression of LincRNA- p21 in SH-SY5Y cells. MPP+ induced cellular senescence with decreasing cellular proliferation and viability, increasing expression levels of senescence-associated makers such as genes p53 and p16, accompanied by significantly decreasing telomere length and telomerase activity. At the same time, these effects were abolished by silencing lincRNA-p21 with small interfering RNA (siRNA). On the contrary, β-catenin silencing contributes to reversing anti-senescent effects caused by lincRNA-p21 silencing. Moreover, modifying lincRNA-p21 exerted an anti-senescent influence depending on decreasing oxidant stress. CONCLUSION Our study showed that in the treatment of MPP+, lincRNA-p21 might serve a role in the SH-SY5Y cell senescence by modulating the Wnt/β-catenin pathway, as well as increasing oxidant stress. Thus, trying to target lincRNA-p21 may have important therapeutic and practical implications for PD.
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Affiliation(s)
- Jianyu Zhu
- Department of Traumatology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, People’s Republic of China
| | - Lingli Chen
- Department of Neurology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, People’s Republic of China
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6
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Determination of levodopa by chromatography-based methods in biological samples: a review. ANAL SCI 2022; 38:1009-1017. [PMID: 35715690 DOI: 10.1007/s44211-022-00132-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Accepted: 05/12/2022] [Indexed: 11/01/2022]
Abstract
Levodopa (L-DOPA) is the most effective drug for Parkinson's disease; however, various side effects occur during therapy. L-DOPA metabolites and the high cumulative dose of L-DOPA were responsible for its side effects. It is necessary to monitor the concentration of L-DOPA and its metabolites for individualized therapy. This review focuses on L-DOPA analysis by chromatography-based methods in biological matrices. Literature published up to September 2021 was collected in the PubMed, Web of Science, and Embase by using search strategy ("levodopa" OR "L-DOPA") AND ("chromatography"). A total of 1249 articles were identified and 32 articles were included. The contents for method development and validation were summarized and analyzed. Due to the instability of catecholamines (L-DOPA, dopamine, and 3-O-methyldopa) and carbidopa, antioxidation (0.5 mg sodium metabisulfite for 100 μL sample) and environment temperature control were used alone or in combination to enhance stability. Sample was mainly pretreated by protein precipitation (0.4-0.7 M perchloric acid). Separation was usually achieved using methanol or acetonitrile:water (with formic acid) on C18 columns. Mass spectrometry, electrochemical detector, ultraviolet-visible detector and fluorescence detector were used for detection. For L-DOPA, the calibration range was 2.5-10,000 ng/mL, the matrix effect and its coefficient of variation was 85-115 and -9.0-8.5%, and the recovery was 66.8-127.0%. Without stabilization strategy, L-DOPA was stable in plasma at room temperature for 1-7 h (4-6 h for most studies), at - 70 °C to - 80 °C for 10-20 days and after 3-5 freeze-thaw cycles. With stabilization strategies, the stability of L-DOPA in plasma was significantly improved. Metabolites of L-DOPA and enzyme inhibitors (carbidopa, entacapone, tolcapone and benserazide) were all stable in biological matrix. This study might be useful for researchers to develop their methods for individualized therapy of patients with Parkinson.
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7
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Gopinath A, Mackie P, Hashimi B, Buchanan AM, Smith AR, Bouchard R, Shaw G, Badov M, Saadatpour L, Gittis A, Ramirez-Zamora A, Okun MS, Streit WJ, Hashemi P, Khoshbouei H. DAT and TH expression marks human Parkinson's disease in peripheral immune cells. NPJ Parkinsons Dis 2022; 8:72. [PMID: 35672374 PMCID: PMC9174333 DOI: 10.1038/s41531-022-00333-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 05/11/2022] [Indexed: 12/26/2022] Open
Abstract
Parkinson's disease (PD) is marked by a loss of dopamine neurons, decreased dopamine transporter (DAT) and tyrosine hydroxylase (TH) expression. However, this validation approach cannot be used for diagnostic, drug effectiveness or investigational purposes in human patients because midbrain tissue is accessible postmortem. PD pathology affects both the central nervous and peripheral immune systems. Therefore, we immunophenotyped blood samples of PD patients for the presence of myeloid derived suppressor cells (MDSCs) and discovered that DAT+/TH+ monocytic MDSCs, but not granulocytic MDSCs are increased, suggesting a targeted immune response to PD. Because in peripheral immune cells DAT activity underlies an immune suppressive mechanism, we investigated whether expression levels of DAT and TH in the peripheral immune cells marks PD. We found drug naïve PD patients exhibit differential DAT+/TH+ expression in peripheral blood mononuclear cells (PBMCs) compared to aged/sex matched healthy subjects. While total PBMCs are not different between the groups, the percentage of DAT+/TH+ PBMCs was significantly higher in drug naïve PD patients compared to healthy controls irrespective of age, gender, disease duration, disease severity or treatment type. Importantly, treatment for PD negatively modulates DAT+/TH+ expressing PBMCs. Neither total nor the percentage of DAT+/TH+ PBMCs were altered in the Alzheimer's disease cohort. The mechanistic underpinning of this discovery in human PD was revealed when these findings were recapitulated in animal models of PD. The reverse translational experimental strategy revealed that alterations in dopaminergic markers in peripheral immune cells are due to the disease associated changes in the CNS. Our study demonstrates that the dopaminergic machinery on peripheral immune cells displays an association with human PD, with exciting implications in facilitating diagnosis and investigation of human PD pathophysiology.
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Affiliation(s)
- Adithya Gopinath
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.
| | - Phillip Mackie
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | - Basil Hashimi
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | | | - Aidan R Smith
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | | | - Gerry Shaw
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
- EnCor Biotechnology, Inc, Gainesville, FL, USA
| | - Martin Badov
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | - Leila Saadatpour
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
- Department of Neurology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Aryn Gittis
- Carnegie Mellon University, Pittsburgh, PA, USA
| | - Adolfo Ramirez-Zamora
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, UF Health, Gainesville, FL, USA
| | - Michael S Okun
- Department of Neurology, Norman Fixel Institute for Neurological Diseases, UF Health, Gainesville, FL, USA
| | - Wolfgang J Streit
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | - Parastoo Hashemi
- University of South Carolina, Columbia, SC, USA
- Department of Bioengineering, Imperial College, London, UK
| | - Habibeh Khoshbouei
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.
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8
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Prakash S, Carter WG. The Neuroprotective Effects of Cannabis-Derived Phytocannabinoids and Resveratrol in Parkinson's Disease: A Systematic Literature Review of Pre-Clinical Studies. Brain Sci 2021; 11:brainsci11121573. [PMID: 34942876 PMCID: PMC8699487 DOI: 10.3390/brainsci11121573] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 12/12/2022] Open
Abstract
Currently, there are no pharmacological treatments able to reverse nigral degeneration in Parkinson’s disease (PD), hence the unmet need for the provision of neuroprotective agents. Cannabis-derived phytocannabinoids (CDCs) and resveratrol (RSV) may be useful neuroprotective agents for PD due to their anti-oxidative and anti-inflammatory properties. To evaluate this, we undertook a systematic review of the scientific literature to assess the neuroprotective effects of CDCs and RSV treatments in pre-clinical in vivo animal models of PD. The literature databases MEDLINE, EMBASE, PsychINFO, PubMed, and Web of Science core collection were systematically searched to cover relevant studies. A total of 1034 publications were analyzed, of which 18 met the eligibility criteria for this review. Collectively, the majority of PD rodent studies demonstrated that treatment with CDCs or RSV produced a significant improvement in motor function and mitigated the loss of dopaminergic neurons. Biochemical analysis of rodent brain tissue suggested that neuroprotection was mediated by anti-oxidative, anti-inflammatory, and anti-apoptotic mechanisms. This review highlights the neuroprotective potential of CDCs and RSV for in vivo models of PD and therefore suggests their potential translation to human clinical trials to either ameliorate PD progression and/or be implemented as a prophylactic means to reduce the risk of development of PD.
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Affiliation(s)
| | - Wayne G. Carter
- Correspondence: ; Tel.: +44-(0)-1332-724738; Fax: +44-(0)-1332-724626
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9
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Khan ST, Ahmed S, Gul S, Khan A, Al-Harrasi A. Search for safer and potent natural inhibitors of Parkinson's disease. Neurochem Int 2021; 149:105135. [PMID: 34271080 DOI: 10.1016/j.neuint.2021.105135] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 07/09/2021] [Accepted: 07/11/2021] [Indexed: 12/22/2022]
Abstract
After Alzheimer's disease, Parkinson's disease (PD) has taken second place in becoming one of the most commonly occurring neurological diseases being responsible for a number of disabling motor symptoms ranging from bradykinesia, akinesia, tremors to rigidity, that mostly targets the elderly population and severely disrupts their quality of life. The true underlying pathology of PD yet remains a mystery, however, recent advances in the field have pointed towards the production of α-synuclein aggregates, oxidative stress, and an imbalance between levels of acetylcholine and dopamine neurotransmitters in the brain that have been shown to result in loss of coordinated movement. Current treatments of PD include the gold standard dopamine precursor L-dopa, dopamine agonists pergolide and bromocriptine, catechol-o-methyl transferases inhibitors, entacapone and tolcapone and monoamine oxidase inhibitors such as Selegine and Rasagiline amongst several other drugs. While these drugs are successful in treating motor symptoms of the disease, they do so with a plethora of side effects that are especially debilitating to the elderly. In the recent years, a considerable amount of attention has been shifted towards phytocompounds such as flavonoids and green tea catechins due to promising experimental results. In this review, we have compiled phytocompounds that have shown potent activity against some of the most important targets for antiparkinsonian therapy. These compounds have exhibited activities that transcend the limits of simply attenuating mitochondrial oxidative stress and have opened doors to the discovery of novel lead compounds for newer, efficacious antiparkinsonian therapies with wider therapeutic windows.
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Affiliation(s)
- Sidrah Tariq Khan
- Shifa College of Pharmaceutical Sciences, Shifa Tameer-e-Millat University, Islamabad, Pakistan
| | - Sagheer Ahmed
- Shifa College of Pharmaceutical Sciences, Shifa Tameer-e-Millat University, Islamabad, Pakistan.
| | - Saima Gul
- Department of Physical Therapy, Shifa Tameer-e-Millat University, Islamabad, Pakistan
| | - Ajmal Khan
- Natural and Medical Sciences Research Center, University of Nizwa, P.O Box 33, Postal Code 616, Birkat Al Mauz, Nizwa, Oman.
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Center, University of Nizwa, P.O Box 33, Postal Code 616, Birkat Al Mauz, Nizwa, Oman.
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10
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Kumari M, Ramdas P, Radhakrishnan AK, Kutty MK, Haleagrahara N. Tocotrienols Ameliorate Neurodegeneration and Motor Deficits in the 6-OHDA-Induced Rat Model of Parkinsonism: Behavioural and Immunohistochemistry Analysis. Nutrients 2021; 13:nu13051583. [PMID: 34068460 PMCID: PMC8150907 DOI: 10.3390/nu13051583] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 04/04/2021] [Accepted: 04/07/2021] [Indexed: 12/15/2022] Open
Abstract
Parkinson’s disease (PD) is a debilitating neurodegenerative disease, which progresses over time, causing pathological depigmentation of the substantia nigra (SN) in the midbrain due to loss of dopaminergic neurons. Emerging studies revealed the promising effects of some nutrient compounds in reducing the risk of PD. One such nutrient compound that possess neuroprotective effects and prevents neurodegeneration is tocotrienol (T3), a vitamin E family member. In the present study, a single dose intracisternal injection of 250 µg 6-hydroxydopamine (6-OHDA) was used to induce parkinsonism in male Sprague Dawley (SD) rats. Forty-eight hours post injection, the SD rats were orally supplemented with alpha (α)- and gamma (γ)-T3 for 28 days. The neuroprotective effects of α- and γ-T3 were evaluated using behavioural studies and immunohistochemistry (IHC). The findings from this study revealed that supplementation of α- and γ-T3 was able to ameliorate the motor deficits induced by 6-OHDA and improve the neuronal functions by reducing inflammation, reversing the neuronal degradation, and preventing further reduction of dopaminergic neurons in the SN and striatum (STR) fibre density.
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Affiliation(s)
- Mangala Kumari
- Department of Anatomy, Division of Human Biology, School of Medicine, International Medical University, Kuala Lumpur 57000, Malaysia
- Correspondence:
| | - Premdass Ramdas
- Division of Applied Biomedical Sciences and Biotechnology, School of Health Sciences, International Medical University, Kuala Lumpur 57000, Malaysia;
| | - Ammu Kutty Radhakrishnan
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Selangor 47500, Malaysia;
| | - Methil Kannan Kutty
- Department of Medicine, Lincoln University College, Kelana Jaya, Selangor 47301, Malaysia;
| | - Nagaraja Haleagrahara
- College of Medicine and Dentistry, James Cook University, Townsville, QLD 4811, Australia;
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11
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Tsunoda SM, Gonzales C, Jarmusch AK, Momper JD, Ma JD. Contribution of the Gut Microbiome to Drug Disposition, Pharmacokinetic and Pharmacodynamic Variability. Clin Pharmacokinet 2021; 60:971-984. [PMID: 33959897 PMCID: PMC8332605 DOI: 10.1007/s40262-021-01032-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/23/2021] [Indexed: 12/20/2022]
Abstract
The trillions of microbes that make up the gut microbiome are an important contributor to health and disease. With respect to xenobiotics, particularly orally administered compounds, the gut microbiome interacts directly with drugs to break them down into metabolic products. In addition, microbial products such as bile acids interact with nuclear receptors on host drug-metabolizing enzyme machinery, thus indirectly influencing drug disposition and pharmacokinetics. Gut microbes also influence drugs that undergo enterohepatic recycling by reversing host enzyme metabolic processes and increasing exposure to toxic metabolites as exemplified by the chemotherapy agent irinotecan and non-steroidal anti-inflammatory drugs. Recent data with immune checkpoint inhibitors demonstrate the impact of the gut microbiome on drug pharmacodynamics. We summarize the clinical importance of gut microbe interaction with digoxin, irinotecan, immune checkpoint inhibitors, levodopa, and non-steroidal anti-inflammatory drugs. Understanding the complex interactions of the gut microbiome with xenobiotics is challenging; and highly sensitive methods such as untargeted metabolomics with molecular networking along with other in silico methods and animal and human in vivo studies will uncover mechanisms and pathways. Incorporating the contribution of the gut microbiome to drug disposition, pharmacokinetics, and pharmacodynamics is vital in this era of precision medicine.
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Affiliation(s)
- Shirley M Tsunoda
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, MC 0657, La Jolla, San Diego, CA, 90293-0657, USA.
| | - Christopher Gonzales
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, MC 0657, La Jolla, San Diego, CA, 90293-0657, USA
| | - Alan K Jarmusch
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, MC 0657, La Jolla, San Diego, CA, 90293-0657, USA.,Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, San Diego, CA, USA
| | - Jeremiah D Momper
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, MC 0657, La Jolla, San Diego, CA, 90293-0657, USA
| | - Joseph D Ma
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, MC 0657, La Jolla, San Diego, CA, 90293-0657, USA
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12
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Müller F, Holze F, Dolder P, Ley L, Vizeli P, Soltermann A, Liechti ME, Borgwardt S. MDMA-induced changes in within-network connectivity contradict the specificity of these alterations for the effects of serotonergic hallucinogens. Neuropsychopharmacology 2021; 46:545-553. [PMID: 33219313 PMCID: PMC8027447 DOI: 10.1038/s41386-020-00906-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 10/20/2020] [Accepted: 10/26/2020] [Indexed: 12/29/2022]
Abstract
It has been reported that serotonergic hallucinogens like lysergic acid diethylamide (LSD) induce decreases in functional connectivity within various resting-state networks. These alterations were seen as reflecting specific neuronal effects of hallucinogens and it was speculated that these shifts in connectivity underlie the characteristic subjective drug effects. In this study, we test the hypothesis that these alterations are not specific for hallucinogens but that they can be induced by monoaminergic stimulation using the non-hallucinogenic serotonin-norepinephrine-dopamine releasing agent 3,4-methylenedioxymethamphetamine (MDMA). In a randomized, placebo-controlled, double-blind, crossover design, 45 healthy participants underwent functional magnetic resonance imaging (fMRI) following oral administration of 125 mg MDMA. The networks under question were identified using independent component analysis (ICA) and were tested with regard to within-network connectivity. Results revealed decreased connectivity within two visual networks, the default mode network (DMN), and the sensorimotor network. These findings were almost identical to the results previously reported for hallucinogenic drugs. Therefore, our results suggest that monoaminergic substances can induce widespread changes in within-network connectivity in the absence of marked subjective drug effects. This contradicts the notion that these alterations can be regarded as specific for serotonergic hallucinogens. However, changes within the DMN might explain antidepressants effects of some of these substances.
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Affiliation(s)
- Felix Müller
- Department of Psychiatry (UPK), University of Basel, Basel, 4002, Switzerland.
| | - Friederike Holze
- Division of Clinical Pharmacology and Toxicology, Department of Biomedicine and Department of Clinical Research, University Hospital Basel, University of Basel, Basel, 4031, Switzerland
| | - Patrick Dolder
- Division of Clinical Pharmacology and Toxicology, Department of Biomedicine and Department of Clinical Research, University Hospital Basel, University of Basel, Basel, 4031, Switzerland
| | - Laura Ley
- Division of Clinical Pharmacology and Toxicology, Department of Biomedicine and Department of Clinical Research, University Hospital Basel, University of Basel, Basel, 4031, Switzerland
| | - Patrick Vizeli
- Division of Clinical Pharmacology and Toxicology, Department of Biomedicine and Department of Clinical Research, University Hospital Basel, University of Basel, Basel, 4031, Switzerland
| | - Alain Soltermann
- Department of Psychiatry (UPK), University of Basel, Basel, 4002, Switzerland
| | - Matthias E Liechti
- Division of Clinical Pharmacology and Toxicology, Department of Biomedicine and Department of Clinical Research, University Hospital Basel, University of Basel, Basel, 4031, Switzerland
| | - Stefan Borgwardt
- Department of Psychiatry (UPK), University of Basel, Basel, 4002, Switzerland
- Department of Psychiatry and Psychotherapy, University of Lübeck, Lübeck, 23538, Germany
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13
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Christensen C, Þorsteinsson H, Maier VH, Karlsson KÆ. Multi-parameter Behavioral Phenotyping of the MPP+ Model of Parkinson's Disease in Zebrafish. Front Behav Neurosci 2021; 14:623924. [PMID: 33390914 PMCID: PMC7775599 DOI: 10.3389/fnbeh.2020.623924] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 11/30/2020] [Indexed: 12/18/2022] Open
Abstract
Parkinson's disease (PD) has been modeled in several animal species using the neurotoxins 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and its oxidized product 1-methyl-4-phenylpyridinium (MPP+). MPP+ selectively kills dopaminergic neurons in pars compacta of the substantia nigra, inducing parkinsonian symptoms in animals. Typically, neurotoxicity models of PD in zebrafish assess acute drug effects on locomotion. In the present study, we examined the lasting effects of MPP+ exposure and drug treatment in zebrafish larvae. Larvae were incubated in 500 μM MPP+, from 1 to 5 days post fertilization (dpf), followed by 24 h drug-free acclimation. At 6 dpf, the behavior was analyzed for locomotion, thigmotaxis, and sleep. Next, in separate assays we assessed the drug effects of brain injected glial cell-derived neurotrophic factor (GDNF) and 4-phenylbutyrate (PBA), co-incubated with MPP+. We show that MPP+ exposure consistently reduces swim distance, movement frequency, and cumulative time of movement; thus mimicking a parkinsonian phenotype of reduced movement. In contrast, MPP+ exposed larvae demonstrate reduced anxiety-like behavior and exhibit a sleep phenotype inconsistent with human PD: the larvae display longer sleep bouts, less sleep fragmentation, and more sleep. Previously reported rescuing effects of PBA were not replicated in this study. Moreover, whereas GDNF attenuated the sleep phenotype induced by MPP+, PBA augmented it. The current data suggest that MPP+ exposure generates a multifaceted phenotype in zebrafish and highlights that analyzing a narrow window of data can reveal effects that may be inconsistent with longer multi-parameter approaches. It further indicates that the model generally captures motor symptoms more faithfully than non-motor symptoms.
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Affiliation(s)
| | | | | | - Karl Ægir Karlsson
- 3Z Ehf, Reykjavik, Iceland.,Biomedical Center, University of Iceland, Reykjavik, Iceland.,Department of Engineering, School of Technology, Reykjavik University, Reykjavik, Iceland
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14
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Goelman G, Dan R, Růžička F, Bezdicek O, Jech R. Altered sensorimotor fMRI directed connectivity in Parkinson's disease patients. Eur J Neurosci 2020; 53:1976-1987. [PMID: 33222299 DOI: 10.1111/ejn.15053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 11/10/2020] [Accepted: 11/13/2020] [Indexed: 11/30/2022]
Abstract
Dopamine depletion in the axons of Parkinson's disease (PD) patients precedes depletion in cell bodies thus proposing that macroscopic connectivity can be used to understand disease mechanism. A novel multivariate functional connectivity analysis, based on high order coherence among four fMRI BOLD signals was applied on resting-state fMRI data of controls and PD patients (OFF and ON medication states) and unidirectional multiple-region pathways in the sensorimotor system were identified. Pathways were classified as "preserved" (unaffected by the disease), "damaged" (not observed in patients) and "corrected" (observed in controls and in PD-ON state). The majority of all pathways were feedforward, most of them with the pattern "S1→M1→SMA." Of these pathways, 67% were "damaged," 28% "preserved," and 5% "corrected." Prefrontal cortex (PFC) afferent and efferent pathways that corresponded to goal directed and habitual activities corresponded to recurrent circuits. Eighty-one percent of habitual afferent had internal cue (i.e., M1→S1→), of them 79% were "damaged" and the rest "preserved." All goal-directed afferent had external cue (i.e., S1→M1→) with third "damaged," third "preserved," and third "corrected." Corrected pathways were initiated in the dorsolateral PFC. Reduced connectivity of the SMA and PFC resulted from reduced sensorimotor afferent to these regions. Reduced sensorimotor internal cues to the PFC resulted with reduced habitual processes. Levodopa effects were for pathways that started in region reach with dopamine receptors. This methodology can enrich understudying of PD mechanisms in other (e.g., the default mode network) systems.
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Affiliation(s)
- Gadi Goelman
- Department of Neurology, Hadassah Hebrew University Medical Center, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Rotem Dan
- Department of Neurology, Hadassah Hebrew University Medical Center, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Filip Růžička
- Department of Neurology and Center of Clinical Neuroscience, First Faculty of Medicine, General University Hospital, Charles University, Prague, Czech Republic.,Na Homolce Hospital, Prague, Czech Republic
| | - Ondrej Bezdicek
- Department of Neurology and Center of Clinical Neuroscience, First Faculty of Medicine, General University Hospital, Charles University, Prague, Czech Republic
| | - Robert Jech
- Department of Neurology and Center of Clinical Neuroscience, First Faculty of Medicine, General University Hospital, Charles University, Prague, Czech Republic.,Na Homolce Hospital, Prague, Czech Republic
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15
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Abstract
Parkinson’s Disease (PD) is a complex neurodegenerative disorder that mainly results due to the loss of dopaminergic neurons in the substantia nigra of the midbrain. It is well known that dopamine is synthesized in substantia nigra and is transported to the striatumvianigrostriatal tract. Besides the sporadic forms of PD, there are also familial cases of PD and number of genes (both autosomal dominant as well as recessive) are responsible for PD. There is no permanent cure for PD and to date, L-dopa therapy is considered to be the best option besides having dopamine agonists. In the present review, we have described the genes responsible for PD, the role of dopamine, and treatment strategies adopted for controlling the progression of PD in humans.
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16
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Farino ZJ, Morgenstern TJ, Maffei A, Quick M, De Solis AJ, Wiriyasermkul P, Freyberg RJ, Aslanoglou D, Sorisio D, Inbar BP, Free RB, Donthamsetti P, Mosharov EV, Kellendonk C, Schwartz GJ, Sibley DR, Schmauss C, Zeltser LM, Moore H, Harris PE, Javitch JA, Freyberg Z. New roles for dopamine D 2 and D 3 receptors in pancreatic beta cell insulin secretion. Mol Psychiatry 2020; 25:2070-2085. [PMID: 30626912 PMCID: PMC6616020 DOI: 10.1038/s41380-018-0344-6] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 09/17/2018] [Accepted: 12/10/2018] [Indexed: 01/11/2023]
Abstract
Although long-studied in the central nervous system, there is increasing evidence that dopamine (DA) has important roles in the periphery including in metabolic regulation. Insulin-secreting pancreatic β-cells express the machinery for DA synthesis and catabolism, as well as all five DA receptors. In these cells, DA functions as a negative regulator of glucose-stimulated insulin secretion (GSIS), which is mediated by DA D2-like receptors including D2 (D2R) and D3 (D3R) receptors. However, the fundamental mechanisms of DA synthesis, storage, release, and signaling in pancreatic β-cells and their functional relevance in vivo remain poorly understood. Here, we assessed the roles of the DA precursor L-DOPA in β-cell DA synthesis and release in conjunction with the signaling mechanisms underlying DA's inhibition of GSIS. Our results show that the uptake of L-DOPA is essential for establishing intracellular DA stores in β-cells. Glucose stimulation significantly enhances L-DOPA uptake, leading to increased DA release and GSIS reduction in an autocrine/paracrine manner. Furthermore, D2R and D3R act in combination to mediate dopaminergic inhibition of GSIS. Transgenic knockout mice in which β-cell D2R or D3R expression is eliminated exhibit diminished DA secretion during glucose stimulation, suggesting a new mechanism where D2-like receptors modify DA release to modulate GSIS. Lastly, β-cell-selective D2R knockout mice exhibit marked postprandial hyperinsulinemia in vivo. These results reveal that peripheral D2R and D3R receptors play important roles in metabolism through their inhibitory effects on GSIS. This opens the possibility that blockade of peripheral D2-like receptors by drugs including antipsychotic medications may significantly contribute to the metabolic disturbances observed clinically.
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Affiliation(s)
- Zachary J. Farino
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Travis J. Morgenstern
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Antonella Maffei
- Division of Endocrinology, Department of Medicine, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Matthias Quick
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY, USA
| | - Alain J. De Solis
- Division of Molecular Genetics, Naomi Berrie Diabetes Center, Columbia University, New York, NY, USA
| | - Pattama Wiriyasermkul
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Current address: Department of Collaborative Research, Nara Medical University, Kashihara, Nara, Japan
| | - Robin J. Freyberg
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Denise Sorisio
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Benjamin P. Inbar
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - R. Benjamin Free
- Molecular Neuropharmacology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Prashant Donthamsetti
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Current address: Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA
| | - Eugene V. Mosharov
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY, USA,Department of Neurology, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Christoph Kellendonk
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY, USA,Department of Pharmacology, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Gary J. Schwartz
- Departments of Medicine and Neuroscience, Albert Einstein College of Medicine, Bronx, NY, USA
| | - David R. Sibley
- Molecular Neuropharmacology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Claudia Schmauss
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY, USA
| | - Lori M. Zeltser
- Division of Molecular Genetics, Naomi Berrie Diabetes Center, Columbia University, New York, NY, USA,Department of Pathology and Cell Biology, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Holly Moore
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Division of Integrative Neuroscience, New York State Psychiatric Institute, New York, NY, USA
| | - Paul E. Harris
- Division of Endocrinology, Department of Medicine, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Jonathan A. Javitch
- Department of Psychiatry, College of Physicians & Surgeons, Columbia University, New York, NY, USA,Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY, USA,Department of Pharmacology, College of Physicians & Surgeons, Columbia University, New York, NY, USA
| | - Zachary Freyberg
- Department of Psychiatry, University of Pittsburgh, Pittsburgh, PA, USA. .,Department of Cell Biology, University of Pittsburgh, Pittsburgh, PA, USA.
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17
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Powell DW, Blackmore SE, Puppa M, Lester D, Murray NG, Reed-Jones RJ, Xia RP. Deep brain stimulation enhances movement complexity during gait in individuals with Parkinson's disease. Neurosci Lett 2020; 728:133588. [PMID: 29751070 DOI: 10.1016/j.neulet.2018.05.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 04/13/2018] [Accepted: 05/04/2018] [Indexed: 12/11/2022]
Abstract
Deep brain stimulation (DBS) is associated with substantial improvements in motor symptoms of PD. Emerging evidence has suggested that nonlinear measures of complexity may provide greater insight into the efficacy of anti-PD treatments. This study investigated sample entropy and complexity index values in individuals with PD when DBS was OFF compared to ON. Five individuals with PD using DBS performed a four-minute treadmill walking task while 3D kinematics were collected over two periods of 30 s. Participants were tested in the DBS-ON and DBS-OFF conditions. Sample entropy (SE) and complexity index (CI) values were calculated for ankle, knee and hip joint angles. Paired samples t-tests were used to compare mean SE and CI values between the DBS-OFF and DBS-ON conditions, respectively. No differences in SE or CI were observed between the DBS-ON and DBS-OFF conditions at the ankle. At the knee, the DBS-ON was associated with greater SE and CI values than the DBS-OFF condition. At the hip, DBS-ON was associated with greater SE and CI values than the DBS-OFF condition. DBS enhances complexity of movement at the hip and knee joints while complexity at the ankle joint is not significantly altered. Greater complexity of knee and hip joint motion may represent increased adaptability and a greater number of available strategies to complete the gait task.
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Affiliation(s)
- Douglas W Powell
- Exercise Neuroscience Research Laboratory, School of Health Studies, University of Memphis, Memphis, TN, USA.
| | - Sarah E Blackmore
- Exercise Neuroscience Research Laboratory, School of Health Studies, University of Memphis, Memphis, TN, USA
| | - Melissa Puppa
- Exercise Neuroscience Research Laboratory, School of Health Studies, University of Memphis, Memphis, TN, USA
| | - Deranda Lester
- Exercise Neuroscience Research Laboratory, School of Health Studies, University of Memphis, Memphis, TN, USA
| | - Nicholas G Murray
- School of Community Health Sciences, University of Nevada at Reno, Reno, NV, USA
| | - Rebecca J Reed-Jones
- Kinesiology Laboratory, Department of Kinesiology, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Rui-Ping Xia
- Department of Physical Therapy, University of Saint Mary, Leavenworth, KS, USA
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18
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Li H, Liu Y, Xing L, Yang X, Xu J, Ren Q, Su KP, Lu Y, Wang F. Association of Cigarette Smoking with Sleep Disturbance and Neurotransmitters in Cerebrospinal Fluid. Nat Sci Sleep 2020; 12:801-808. [PMID: 33122957 PMCID: PMC7591043 DOI: 10.2147/nss.s272883] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 09/14/2020] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Cigarette smoking has shown to be associated with sleep disturbance, especially prolonged sleep onset latency (SOL). Cigarette smoking stimulates the release of dopamine (DA) and serotonin (5-HT), which might promote awakening and inhibit rapid eye movement sleep. Dopamine transporter (DAT) and serotonin transporter play a key role in the reuptake of DA and 5-HT from the synaptic cleft into presynaptic neurons. However, the relationship among cigarette smoking, sleep disturbance and neurotransmitters has never been investigated in human cerebrospinal fluid (CSF). METHODS A total of 159 Chinese male subjects (81 active smokers and 78 non-smokers) who would undergo lumbar puncture before the surgery of anterior cruciate ligament reconstruction were recruited and 5mL-CSF samples were collected incidentally. CSF levels of DA, DAT, 5-HT, and serotonin transporter were measured using radioimmunoassay and ELISA. Sociodemographic data and the Pittsburgh Sleep Quality Index (PSQI) scale were collected before surgery. RESULTS PSQI global scores, SOL, and CSF DA levels were significantly higher in active smokers compared to non-smokers (2.00 [1.00-4.75] scores vs 4.00 [3.00-6.00] scores, p = 0.001; 10.00 [5.00-15.00] minutes vs 15.00 [10.00-30.00] minutes, p = 0.002; 87.20 [82.31-96.06]ng/mL vs 107.45 [92.78-114.38] ng/mL, p < 0.001), while CSF DAT levels were significantly lower in active smokers (0.35 [0.31-0.39] ng/mL vs 0.29 [0.26-0.34] ng/mL, p < 0.001). CONCLUSION Cigarette smoking was indeed associated with sleep disturbance, shown by prolonged SOL, higher DA levels and lower DAT levels in CSF of active smokers.
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Affiliation(s)
- Hui Li
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, People's Republic of China.,Xinjiang Key Laboratory of Neurological Disorder Research, The Second Affiliated Hospital, Xinjiang Medical University, Urumqi 830063, People's Republic of China.,Psychosomatic Medicine Research Division, Inner Mongolia Medical University, Huhhot 010110, People's Republic of China
| | - Yanlong Liu
- Zhuji Institute of Biomedicine, School of Pharmaceutical Sciences, Wenzhou Medical University, Shaoxing 311800, People's Republic of China.,School of Mental Health, Wenzhou Medical University, Wenzhou, 325035, People's Republic of China.,The Affiliated Kangning Hospital, Wenzhou Medical University, Wenzhou 325035, People's Republic of China
| | - Lifei Xing
- Department of Neurology, Inner Mongolia North Heavy Industries Group Corp. Ltd Hospital, Baotou 014030, People's Republic of China
| | - Xiaoyu Yang
- Beijing Jishuitan Hospital, Beijing 100035, People's Republic of China
| | - Jinzhong Xu
- The Affiliated Wenling Hospital of Wenzhou Medical University, Wenling 317500, People's Republic of China
| | - Qiushi Ren
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Kuan-Pin Su
- Zhuji Institute of Biomedicine, School of Pharmaceutical Sciences, Wenzhou Medical University, Shaoxing 311800, People's Republic of China.,An-Nan Hospital, China Medical University, Tainan, Taiwan.,College of Medicine, China Medical University, Taichung, Taiwan
| | - Yanye Lu
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Fan Wang
- Xinjiang Key Laboratory of Neurological Disorder Research, The Second Affiliated Hospital, Xinjiang Medical University, Urumqi 830063, People's Republic of China.,Psychosomatic Medicine Research Division, Inner Mongolia Medical University, Huhhot 010110, People's Republic of China.,Beijing Hui-Long-Guan Hospital, Peking University, Beijing 100096, People's Republic of China
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19
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Weis S, Schwiertz A, Unger MM, Becker A, Faßbender K, Ratering S, Kohl M, Schnell S, Schäfer KH, Egert M. Effect of Parkinson's disease and related medications on the composition of the fecal bacterial microbiota. NPJ Parkinsons Dis 2019; 5:28. [PMID: 31815177 PMCID: PMC6884491 DOI: 10.1038/s41531-019-0100-x] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 10/29/2019] [Indexed: 02/07/2023] Open
Abstract
Parkinson's disease (PD) is one of the most common neurodegenerative disorders. PD patients suffer from gastrointestinal dysfunctions and alterations of the autonomous nervous system, especially its part in the gut wall, i.e., the enteric nervous system (ENS). Such alterations and functional gastrointestinal deficits often occur years before the classical clinical symptoms of PD appear. Until now, only little is known about PD-associated changes in gut microbiota composition and their potential implication in PD development. In order to increase knowledge in this field, fecal samples of 34 PD patients and 25 healthy, age-matched control persons were investigated. Here, the V4 and V5 hypervariable region of bacterial 16S rRNA genes was PCR-amplified and sequenced using an Ion Torrent PGM platform. Within the PD group, we observed a relative decrease in bacterial taxa which are linked to health-promoting, anti-inflammatory, neuroprotective or other beneficial effects on the epithelial barrier, such as Faecalibacterium and Fusicatenibacter. Both taxa were lowered in PD patients with elevated levels of the fecal inflammation marker calprotectin. In addition, we observed an increase in shares of the Clostridiales family XI and their affiliated members in these samples. Finally, we found that the relative abundances of the bacterial genera Peptoniphilus, Finegoldia, Faecalibacterium Fusicatenibacter, Anaerococcus, Bifidobacterium, Enterococcus, and Ruminococcus were significantly influenced by medication with L-dopa and entacapone, respectively. Our data confirm previously reported effects of COMT inhibitors on the fecal microbiota of PD patients and suggest a possible effect of L-dopa medication on the relative abundance of several bacterial genera.
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Affiliation(s)
- Severin Weis
- Faculty of Medical and Life Sciences, Institute of Precision Medicine, Microbiology and Hygiene Group, Furtwangen University, Villingen-Schwenningen, Germany
| | | | - Marcus M. Unger
- Department of Neurology, Saarland University, Homburg, Germany
| | - Anouck Becker
- Department of Neurology, Saarland University, Homburg, Germany
| | - Klaus Faßbender
- Department of Neurology, Saarland University, Homburg, Germany
| | - Stefan Ratering
- Institute of Applied Microbiology, Justus-Liebig-University, Giessen, Germany
| | - Matthias Kohl
- Faculty of Medical and Life Sciences, Institute of Precision Medicine, Group for Statistics in Biology and Medicine, Furtwangen University, Villingen-Schwenningen, Germany
| | - Sylvia Schnell
- Institute of Applied Microbiology, Justus-Liebig-University, Giessen, Germany
| | - Karl-Herbert Schäfer
- Department of Biotechnology, ENS Working Group, University of Applied Sciences Kaiserslautern, Zweibrücken, Germany
| | - Markus Egert
- Faculty of Medical and Life Sciences, Institute of Precision Medicine, Microbiology and Hygiene Group, Furtwangen University, Villingen-Schwenningen, Germany
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20
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Aponte EA, Schöbi D, Stephan KE, Heinzle J. Computational Dissociation of Dopaminergic and Cholinergic Effects on Action Selection and Inhibitory Control. BIOLOGICAL PSYCHIATRY: COGNITIVE NEUROSCIENCE AND NEUROIMAGING 2019; 5:364-372. [PMID: 31952937 DOI: 10.1016/j.bpsc.2019.10.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 10/06/2019] [Accepted: 10/28/2019] [Indexed: 12/23/2022]
Abstract
BACKGROUND Patients with schizophrenia make more errors than healthy subjects in the antisaccade task. In this paradigm, participants are required to inhibit a reflexive saccade to a target and to select the correct action (a saccade in the opposite direction). While the precise origin of this deficit is not clear, it has been connected to aberrant dopaminergic and cholinergic neuromodulation. METHODS To study the impact of dopamine and acetylcholine on inhibitory control and action selection, we administered two selective drugs (levodopa 200 mg/galantamine 8 mg) to healthy volunteers (N = 100) performing the antisaccade task. The computational model SERIA (stochastic early reaction, inhibition, and late action) was employed to separate the contribution of inhibitory control and action selection to empirical reaction times and error rates. RESULTS Modeling suggested that levodopa improved action selection (at the cost of increased reaction times) but did not have a significant effect on inhibitory control. By contrast, according to our model, galantamine affected inhibitory control in a dose-dependent fashion, reducing inhibition failures at low doses and increasing them at higher levels. These effects were sufficiently specific that the computational analysis allowed for identifying the drug administered to an individual with 70% accuracy. CONCLUSIONS Our results do not support the hypothesis that elevated tonic dopamine strongly impairs inhibitory control. Rather, levodopa improved the ability to select correct actions. However, inhibitory control was modulated by cholinergic drugs. This approach may provide a starting point for future computational assays that differentiate neuromodulatory abnormalities in heterogeneous diseases like schizophrenia.
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Affiliation(s)
- Eduardo A Aponte
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland.
| | - Dario Schöbi
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland
| | - Klaas E Stephan
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland; Wellcome Centre for Human Neuroimaging, University College London, London, United Kingdom; Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Jakob Heinzle
- Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zurich, Switzerland.
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21
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Augusto CMG, de Morais NS, Santana RP, de Almeida MOP. PARKINSONISM AS AN ATYPICAL MANIFESTATION OF PRIMARY HYPERPARATHYROIDISM. AACE Clin Case Rep 2019; 5:e244-e246. [PMID: 31967044 DOI: 10.4158/accr-2018-0504] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 02/04/2019] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE Primary hyperparathyroidism (PHPT) occurs as a result of hyperfunctional parathyroid glands resulting in an elevation of serum calcium levels. The association between hypoparathyroidism and parkinsonism have been frequently reported in the literature, while evidence of hyperparathyroidism associated with parkinsonism is rare. METHODS The present study reports a case of a patient that had PHPT and developed symptoms of parkinsonism. RESULTS A 75-year-old female patient with a history of diabetes mellitus, dyslipidemia, and systemic arterial hypertension presented to the emergency room due to unexplained drowsiness. Her serum calcium at the time was 14.2 mg/dL. A cervical ultrasound was performed, and the presence of a 2.5 × 1.9-cm nodule in the left lower parathyroid region was identified. Three days later, scintigraphy with the use of sestamibi showed an increased capture of the marker in the same region, suggesting parathyroid hyperfunction. During hospitalization, the patient developed symptoms of parkinsonism. A left inferior parathyroidectomy was performed, with normalization of serum calcium levels and a remission of drowsiness, in addition to a significant improvement in parkinsonian symptoms. The patient remained free of parkinsonism over 3 years of follow up. CONCLUSION Parathyroidectomy can provide a significant remission of parkinsonism in a patient with PHPT. Even though it is rare, the relation between parkinsonism and PHPT exists.
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Monitoring of the deuterated and nondeuterated forms of levodopa and five metabolites in plasma and urine by LC-MS/MS. Bioanalysis 2019; 11:279-293. [PMID: 30786726 DOI: 10.4155/bio-2018-0239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
To compare pharmacokinetics, metabolism and excretion of levodopa and a triply deuterated form, which is being developed as an improved treatment for Parkinson's disease, methods were needed for quantification of the deuterated and nondeuterated forms of levodopa and five metabolites in human plasma and urine. Results: The natural heavy isotopes in the nondeuterated compounds caused an absolute contribution of up to 100% in the response of the deuterated compounds. Similarly, heavy isotopes in the deuterated analytes contributed to the response of the internal standards, but this did not affect the reliability of the results. Conclusion: Deuterated and nondeuterated analytes can be quantified together by LC-MS/MS, but overestimation of the concentrations of the deuterated molecules may be unavoidable and a careful interpretation of the concentration data is essential.
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Lopes MDS, Melo ADS, Corona AP, Nóbrega AC. Efeito da levodopa na mecânica coclear e no sistema auditivo eferente de indivíduos com doença de Parkinson. Codas 2019; 31:e20170249. [DOI: 10.1590/2317-1782/20182018249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 05/14/2018] [Indexed: 11/22/2022] Open
Abstract
RESUMO Objetivo Analisar o efeito da levodopa na dinâmica coclear, bem como na via eferente olivococlear medial de indivíduos com doença de Parkinson idiopática (DP). Método Indivíduos com e sem DP, acompanhados em um hospital universitário, realizaram a pesquisa das emissões otoacústicas por produto de distorção (EOAPD) e do efeito inibitório das EOAPD (EIEOA) na presença de ruído contralateral. Foram estabelecidas as medidas de correlação entre os resultados das EOAPD e do EIEOA com estágio Hoehn&Yahr (H&Y), dose diária de levodopa e tempo de diagnóstico da DP. Além disso, as medidas eletroacústicas foram comparadas entre os indivíduos sem DP e com DP, estratificados de acordo com a dose de levodopa administrada diariamente. Resultados Foi identificada correlação fraca e negativa entre a amplitude das EOAPD com a dose diária de levodopa e correlações positivas, de força moderada e fraca, entre o EIEOA com a dose diária de levodopa e o tempo de diagnóstico da DP, respectivamente. A amplitude das EOAPD foi maior nos indivíduos com DP em uso de levodopa ≤ 600 miligramas quando comparada à de indivíduos sem DP e com DP, em uso de dose superior. Já o EIEOA foi menor nos indivíduos em uso de doses ≤ 600 miligramas, quando comparado aos demais grupos. Conclusão Doses diárias de levodopa iguais ou inferiores a 600 mg/dia aumentam as respostas mecanotransdutoras cocleares nas frequências de 2 e 3 kHz, enquanto que a ação dos sistemas eferentes olivococleares é reduzida nesta região.
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Botzer A, Finkelstein Y, Grossman E, Moult J, Unger R. Iatrogenic hypertension: a bioinformatic analysis. THE PHARMACOGENOMICS JOURNAL 2018; 19:337-346. [PMID: 30393374 DOI: 10.1038/s41397-018-0062-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 08/17/2018] [Accepted: 09/27/2018] [Indexed: 01/09/2023]
Abstract
It is well known that a myriad of medications and substances can induce side effects that are related to blood pressure (BP) regulation. This study aims to investigate why certain drugs tend to cause iatrogenic hypertension (HTN) and focus on drug targets that are implicated in these conditions.Databases and resources such as SIDER, DrugBank, and Genomatix were utilized in order to bioinformatically investigate HTN-associated drug target-genes for which HTN is a side effect. A tree-like map was created, representing interactions between 198 human genes that relate to the blood pressure system. 72 HTN indicated drugs and 160 HTN-inducing drugs were investigated. HTN-associated genes affected by these drugs were identified. HTN indicated drugs, which target nearly all branches of the interaction tree, were shown to exert an effect on most functional sub-systems of the BP regulatory system; and specifically, for the adrenergic and dopaminergic receptor pathways. High prevalence (25 genes) of shared targets between the HTN indicated and HTN-inducing drug categories was demonstrated. We focus on six drug families which are not indicated for HTN treatment, yet are reported as a major cause for blood pressure side effects. We show the molecular mechanisms that may lead to this iatrogenic effect. Such an analysis may have clinical implications that could allow for the development of tailored medicine with fewer side effects.
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Affiliation(s)
- Alon Botzer
- The Mina & Everard Goodman Faculty of Life Sciences, Bar Ilan University, Ramat Gan, Israel
| | - Yoram Finkelstein
- Neurology and Toxicology Service and Unit, Shaare Zedek Medical Center, Jerusalem, Israel
| | - Ehud Grossman
- Department of Internal Medicine D and Hypertension Unit, The Chaim Sheba Medical Center, Tel-Hashomer, Ramat Gan, Israel.,Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - John Moult
- Institute for Bioscience and Biotechnology Research and Department of Cell Biology and Molecular Genetics, University of Maryland, Rockville, MD, USA
| | - Ron Unger
- The Mina & Everard Goodman Faculty of Life Sciences, Bar Ilan University, Ramat Gan, Israel.
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Aarthy M, Panwar U, Selvaraj C, Singh SK. Advantages of Structure-Based Drug Design Approaches in Neurological Disorders. Curr Neuropharmacol 2017; 15:1136-1155. [PMID: 28042767 PMCID: PMC5725545 DOI: 10.2174/1570159x15666170102145257] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 11/05/2016] [Accepted: 11/03/2016] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVE The purpose of the review is to portray the theoretical concept on neurological disorders from research data. BACKGROUND The freak changes in chemical response of nerve impulse causes neurological disorders. The research evidence of the effort done in the older history suggests that the biological drug targets and their effective feature with responsive drugs could be valuable in promoting the future development of health statistics structure for improved treatment for curing the nervous disorders. METHODS In this review, we summarized the most iterative theoretical concept of structure based drug design approaches in various neurological disorders to unfathomable understanding of reported information for future drug design and development. RESULTS On the premise of reported information we analyzed the model of theoretical drug designing process for understanding the mechanism and pathology of the neurological diseases which covers the development of potentially effective inhibitors against the biological drug targets. Finally, it also suggests the management and implementation of the current treatment in improving the human health system behaviors. CONCLUSION With the survey of reported information we concluded the development strategies of diagnosis and treatment against neurological diseases which leads to supportive progress in the drug discovery.
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Affiliation(s)
- Murali Aarthy
- Computer Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Alagappa University, Karaikudi-630004, Tamil Nadu, India
| | - Umesh Panwar
- Computer Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Alagappa University, Karaikudi-630004, Tamil Nadu, India
| | - Chandrabose Selvaraj
- Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Postal Code: 143-701, Seoul, Korea
| | - Sanjeev Kumar Singh
- Computer Aided Drug Design and Molecular Modeling Lab, Department of Bioinformatics, Alagappa University, Karaikudi-630004, Tamil Nadu, India
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Abdel-Ghany MF, Hussein LA, Ayad MF, Youssef MM. Investigation of different spectrophotometric and chemometric methods for determination of entacapone, levodopa and carbidopa in ternary mixture. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:236-245. [PMID: 27541796 DOI: 10.1016/j.saa.2016.07.053] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 07/24/2016] [Accepted: 07/31/2016] [Indexed: 06/06/2023]
Abstract
New, simple, accurate and sensitive UV spectrophotometric and chemometric methods have been developed and validated for determination of Entacapone (ENT), Levodopa (LD) and Carbidopa (CD) in ternary mixture. Method A is a derivative ratio spectra zero-crossing spectrophotometric method which allows the determination of ENT in the presence of both LD and CD by measuring the peak amplitude at 249.9nm in the range of 1-20μgmL-1. Method B is a double divisor-first derivative of ratio spectra method, used for determination of ENT, LD and CD at 245, 239 and 293nm, respectively. Method C is a mean centering of ratio spectra which allows their determination at 241, 241.6 and 257.1nm, respectively. Methods B and C could successfully determine the studied drugs in concentration ranges of 1-20μgmL-1 for ENT and 10-90μgmL-1 for both LD and CD. Methods D and E are principal component regression and partial least-squares, respectively, used for the simultaneous determination of the studied drugs by using seventeen mixtures as calibration set and eight mixtures as validation set. The developed methods have the advantage of simultaneous determination of the cited components without any pre-treatment. All the results were statistically compared with the reported methods, where no significant difference was observed. The developed methods were satisfactorily applied to the analysis of the investigated drugs in their pure form and in pharmaceutical dosage forms.
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Affiliation(s)
- Maha F Abdel-Ghany
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Lobna A Hussein
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Miriam F Ayad
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt
| | - Menatallah M Youssef
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Ain-Shams University, Abbassia, Cairo 11566, Egypt.
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Esterson YB, Carey M, Boucai L, Goyal A, Raghavan P, Zhang K, Mehta D, Feng D, Wu L, Kehlenbrink S, Koppaka S, Kishore P, Hawkins M. Central Regulation of Glucose Production May Be Impaired in Type 2 Diabetes. Diabetes 2016; 65:2569-79. [PMID: 27207526 PMCID: PMC5001178 DOI: 10.2337/db15-1465] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 04/19/2016] [Indexed: 12/21/2022]
Abstract
The challenges of achieving optimal glycemic control in type 2 diabetes highlight the need for new therapies. Inappropriately elevated endogenous glucose production (EGP) is the main source of hyperglycemia in type 2 diabetes. Because activation of central ATP-sensitive potassium (KATP) channels suppresses EGP in nondiabetic rodents and humans, this study examined whether type 2 diabetic humans and rodents retain central regulation of EGP. The KATP channel activator diazoxide was administered in a randomized, placebo-controlled crossover design to eight type 2 diabetic subjects and seven age- and BMI-matched healthy control subjects. Comprehensive measures of glucose turnover and insulin sensitivity were performed during euglycemic pancreatic clamp studies following diazoxide and placebo administration. Complementary rodent clamp studies were performed in Zucker Diabetic Fatty rats. In type 2 diabetic subjects, extrapancreatic KATP channel activation with diazoxide under fixed hormonal conditions failed to suppress EGP, whereas matched control subjects demonstrated a 27% reduction in EGP (P = 0.002) with diazoxide. Diazoxide also failed to suppress EGP in diabetic rats. These results suggest that suppression of EGP by central KATP channel activation may be lost in type 2 diabetes. Restoration of central regulation of glucose metabolism could be a promising therapeutic target to reduce hyperglycemia in type 2 diabetes.
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Affiliation(s)
- Yonah B Esterson
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Michelle Carey
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Laura Boucai
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Akankasha Goyal
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Pooja Raghavan
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Kehao Zhang
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Deeksha Mehta
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Daorong Feng
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Licheng Wu
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Sylvia Kehlenbrink
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Sudha Koppaka
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Preeti Kishore
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
| | - Meredith Hawkins
- Diabetes Research and Training Center and Division of Endocrinology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY
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Shellshear L, MacDonald AD, Mahoney J, Finch E, McMahon K, Silburn P, Nathan PJ, Copland DA. Levodopa enhances explicit new-word learning in healthy adults: a preliminary study. Hum Psychopharmacol 2015; 30:341-9. [PMID: 25900350 DOI: 10.1002/hup.2480] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Revised: 01/15/2015] [Accepted: 02/09/2015] [Indexed: 01/31/2023]
Abstract
OBJECTIVE While the role of dopamine in modulating executive function, working memory and associative learning has been established; its role in word learning and language processing more generally is not clear. This preliminary study investigated the impact of increased synaptic dopamine levels on new-word learning ability in healthy young adults using an explicit learning paradigm. METHOD A double-blind, placebo-controlled, between-groups design was used. Participants completed five learning sessions over 1 week with levodopa or placebo administered at each session (five doses, 100 mg). Each session involved a study phase followed by a test phase. Test phases involved recall and recognition tests of the new (non-word) names previously paired with unfamiliar objects (half with semantic descriptions) during the study phase. RESULTS The levodopa group showed superior recall accuracy for new words over five learning sessions compared with the placebo group and better recognition accuracy at a 1-month follow-up for words learnt with a semantic description. CONCLUSIONS These findings suggest that dopamine boosts initial lexical acquisition and enhances longer-term consolidation of words learnt with semantic information, consistent with dopaminergic enhancement of semantic salience.
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Affiliation(s)
- Leanne Shellshear
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Australia.,School of Health and Rehabilitation Sciences, Division of Speech Pathology, The University of Queensland, Brisbane, Australia
| | - Anna D MacDonald
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Australia
| | - Jeffrey Mahoney
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Australia
| | - Emma Finch
- School of Health and Rehabilitation Sciences, Division of Speech Pathology, The University of Queensland, Brisbane, Australia
| | - Katie McMahon
- UQ Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia
| | - Peter Silburn
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Australia
| | - Pradeep J Nathan
- Brain Mapping Unit, Department of Psychiatry, University of Cambridge, Cambridge, UK.,School of Psychology and Psychiatry, Monash University, Melbourne, Australia
| | - David A Copland
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Australia.,School of Health and Rehabilitation Sciences, Division of Speech Pathology, The University of Queensland, Brisbane, Australia
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Fuchs S, Rende E, Crisanti A, Nolan T. Disruption of aminergic signalling reveals novel compounds with distinct inhibitory effects on mosquito reproduction, locomotor function and survival. Sci Rep 2014; 4:5526. [PMID: 24984706 PMCID: PMC4078307 DOI: 10.1038/srep05526] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 06/06/2014] [Indexed: 01/20/2023] Open
Abstract
Insecticide resistance amongst disease vectors is a growing problem and novel compounds are needed. Biogenic amines are important for neurotransmission and we have recently shown a potential role for these in mosquito fertility. Here, we dissected the relative contribution of different aminergic signalling pathways to biological processes essential for vectorial capacity such as fertility, locomotion and survival by injecting agonists and antagonists and showed that octopaminergic/tyraminergic signalling is essential for oviposition and hatching rate. We show that egg melanisation is regulated by adrenergic signalling, whose disruption causes premature melanisation specifically through the action of tyramine. In addition to this, co-injection of tyramine with DOPA, the precursor of melanin, had a strong cumulative negative effect on mosquito locomotion and survival. Dopaminergic and serotonergic antagonists such as amitriptyline and citalopram recapitulate this effect. Together these results reveal potential new target sites for the development of future mosquito sterilants and insecticides.
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Affiliation(s)
- Silke Fuchs
- Department of Life Sciences, Imperial College London, London, UK
| | - Ermelinda Rende
- Department of Pharmaco-Biology, Faculty of Pharmacy, University of Calabria, Arcavacata di Rende, Cosenza, Italy
| | - Andrea Crisanti
- Department of Life Sciences, Imperial College London, London, UK
| | - Tony Nolan
- Department of Life Sciences, Imperial College London, London, UK
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Luo C, Song W, Chen Q, Zheng Z, Chen K, Cao B, Yang J, Li J, Huang X, Gong Q, Shang HF. Reduced functional connectivity in early-stage drug-naive Parkinson's disease: a resting-state fMRI study. Neurobiol Aging 2014; 35:431-41. [DOI: 10.1016/j.neurobiolaging.2013.08.018] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 07/15/2013] [Accepted: 08/16/2013] [Indexed: 11/29/2022]
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Guitart-Masip M, Economides M, Huys QJM, Frank MJ, Chowdhury R, Duzel E, Dayan P, Dolan RJ. Differential, but not opponent, effects of L -DOPA and citalopram on action learning with reward and punishment. Psychopharmacology (Berl) 2014; 231:955-66. [PMID: 24232442 PMCID: PMC3923110 DOI: 10.1007/s00213-013-3313-4] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 10/02/2013] [Indexed: 01/27/2023]
Abstract
RATIONALE Decision-making involves two fundamental axes of control namely valence, spanning reward and punishment, and action, spanning invigoration and inhibition. We recently exploited a go/no-go task whose contingencies explicitly decouple valence and action to show that these axes are inextricably coupled during learning. This results in a disadvantage in learning to go to avoid punishment and in learning to no-go to obtain a reward. The neuromodulators dopamine and serotonin are likely to play a role in these asymmetries: Dopamine signals anticipation of future rewards and is also involved in an invigoration of motor responses leading to reward, but it also arbitrates between different forms of control. Conversely, serotonin is implicated in motor inhibition and punishment processing. OBJECTIVE To investigate the role of dopamine and serotonin in the interaction between action and valence during learning.Methods We combined computational modeling with pharmacological manipulation in 90 healthy human volunteers, using levodopa and citalopram to affect dopamine and serotonin, respectively. RESULTS We found that, after administration of levodopa,action learning was less affected by outcome valence when compared with the placebo and citalopram groups. This highlights in this context a predominant effect of levodopa in controlling the balance between different forms of control.Citalopram had distinct effects, increasing participants'tendency to perform active responses independent of outcome valence, consistent with a role in decreasing motor inhibition. CONCLUSIONS Our findings highlight the rich complexities of the roles played by dopamine and serotonin during instrumental learning.
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Affiliation(s)
- Marc Guitart-Masip
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, WC1N 3BG UK ,Ageing Research Centre, Karolinska Institute, SE-11330 Stockholm, Sweden
| | - Marcos Economides
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, WC1N 3BG UK
| | - Quentin J. M. Huys
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, WC1N 3BG UK ,Translational Neuromodeling Unit, Department of Biological Engineering, ETH and University of Zurich, Zürich, Switzerland ,Gatsby Computational Neuroscience Unit, University College London, London, W1CN 4AR UK ,Department of Psychiatry, Psychotherapy and Psychosomatics, Hospital of Psychiatry, University of Zurich, Zürich, Switzerland
| | - Michael J. Frank
- Department of Cognition, Linguistics, and Psychological Sciences, Brown University, Providence, RI USA
| | - Rumana Chowdhury
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, WC1N 3BG UK ,Institute of Cognitive Neuroscience, University College London, London, W1CN 4AR UK
| | - Emrah Duzel
- Institute of Cognitive Neuroscience, University College London, London, W1CN 4AR UK ,Institute of Cognitive Neurology and Dementia Research, Otto-von-Guericke-University, Leipziger Strasse 44, 39120 Magdeburg, Germany
| | - Peter Dayan
- Gatsby Computational Neuroscience Unit, University College London, London, W1CN 4AR UK
| | - Raymond J. Dolan
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, University College London, London, WC1N 3BG UK
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Mustafa G, Ahmad N, Baboota S, Ali J, Ahuja A. UHPLC/ESI-Q-TOF-MS method for the measurement of dopamine in rodent striatal tissue: a comparative effects of intranasal administration of ropinirole solution over nanoemulsion. Drug Test Anal 2012; 5:702-9. [PMID: 23161806 DOI: 10.1002/dta.1426] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Revised: 08/09/2012] [Accepted: 09/07/2012] [Indexed: 02/06/2023]
Abstract
An ultra high performance liquid chromatography-electrospray ionization-tandem mass spectrometric method (UHPLC/ESI-Q-TOF-MS) for the analysis of dopamine (DA) in Wistar rat brain homogenate has been developed and validated. The chromatographic separation was achieved on a Waters ACQUITY UPLC™ BEH C18 (100.0 mm × 2.1 mm; 1.7 µm) column using isocratic mobile phase, consisting of acetonitrile and Formic acid (0.1% w/v) (10: 90; v/v), at a flow rate of 0.15 ml min(-1) . The transitions occurred at m/z 154.04 → 137.006 for DA, and m/z 184.204 → 166.08 for the internal standard. The recovery of the analytes from Wistar rat brain homogenate was optimized using liquid-liquid extraction technique (LLE) in ethyl acetate. The total run time was 3.5 min and the elution of DA occurred at 1.44 ± 0.05 min. The linear dynamic range was established over the concentration range 75-750 ng mL(-1) (r(2) ; 0.9921 ± 0.0005) for DA. The intra-assay and inter-assay accuracy in terms of % CV was in the range 0.73-2.80. The lower limit of detection (LOD) and quantitation (LOQ) for DA was 0.278 and 0.844 ng mL(-1) , respectively. Analytes were stable under various conditions (in autosampler, during freeze-thaw, at room temperature, and under deep-freeze conditions). The developed method was successfully applied for in vivo profiling in rodents.
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Affiliation(s)
- Gulam Mustafa
- Department of Pharmaceutics, Faculty of Pharmacy, Hamdard University, New Delhi-, 110062, India
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Venhuis B, de Kaste D. Towards a decade of detecting new analogues of sildenafil, tadalafil and vardenafil in food supplements: A history, analytical aspects and health risks. J Pharm Biomed Anal 2012; 69:196-208. [DOI: 10.1016/j.jpba.2012.02.014] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 02/13/2012] [Accepted: 02/14/2012] [Indexed: 11/24/2022]
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Sabioni P, D’Almeida V, Andersen ML, Andreatini R, Galduróz JC. SKF 38393 reverses cocaine-conditioned place preference in mice. Neurosci Lett 2012; 513:214-8. [DOI: 10.1016/j.neulet.2012.02.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 02/11/2012] [Accepted: 02/13/2012] [Indexed: 11/27/2022]
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Kleinjung T, Steffens T, Landgrebe M, Vielsmeier V, Frank E, Burger J, Strutz J, Hajak G, Langguth B. Repetitive transcranial magnetic stimulation for tinnitus treatment: No enhancement by the dopamine and noradrenaline reuptake inhibitor bupropion. Brain Stimul 2011; 4:65-70. [DOI: 10.1016/j.brs.2010.03.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2010] [Revised: 03/16/2010] [Accepted: 03/30/2010] [Indexed: 10/19/2022] Open
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Bugamelli F, Marcheselli C, Barba E, Raggi M. Determination of l-dopa, carbidopa, 3-O-methyldopa and entacapone in human plasma by HPLC–ED. J Pharm Biomed Anal 2011; 54:562-7. [DOI: 10.1016/j.jpba.2010.09.042] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Revised: 09/24/2010] [Accepted: 09/30/2010] [Indexed: 11/16/2022]
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Fernandez N, Garcia JJ, Diez MJ, Sahagun AM, Díez R, Sierra M. Effects of dietary factors on levodopa pharmacokinetics. Expert Opin Drug Metab Toxicol 2010; 6:633-42. [DOI: 10.1517/17425251003674364] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Knab AM, Bowen RS, Hamilton AT, Gulledge AA, Lightfoot JT. Altered dopaminergic profiles: implications for the regulation of voluntary physical activity. Behav Brain Res 2009; 204:147-52. [PMID: 19520120 DOI: 10.1016/j.bbr.2009.05.034] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Revised: 04/17/2009] [Accepted: 05/27/2009] [Indexed: 12/22/2022]
Abstract
The biological regulating factors of physical activity in animals are not well understood. This study investigated differences in the central mRNA expression of seven dopamine genes (Drd1, Drd2, Drd3, Drd4, Drd5, TH, and DAT) between high active C57/LJ (n=17) male mice and low active C3H/HeJ (n=20) male mice, and between mice with access to a running wheel and without running wheel access within strain. Mice were housed with running wheels interfaced with a computer for 21 days with distance and duration recorded every 24 h. On day 21, the striatum and nucleus accumbens were removed during the active period (approximately 9 pm) for dopaminergic analysis. On average, the C57L/J mice with wheels ran significantly farther (10.25+/-1.37 km/day vs. 0.01+/-0.09 km/day, p<0.001), longer (329.73+/-30.52 min/day vs. 7.81+/-6.32 min/day, p<0.001), and faster (31.27+/-3.13 m/min vs. 11.81+/-1.08 m/min, p<0.001) than the C3H/HeJ mice with wheels over the 21 day period. No differences in gene expression were found between mice in either strain with wheels and those without wheels suggesting that access to running wheels did not alter dopaminergic expression. In contrast, relative expression for two dopamine genes was significantly lower in the C57L/J mice compared to the C3H/HeJ mice. These results indicate that decreased dopaminergic functioning is correlated with increased activity levels in C57L/J mice and suggests that D1-like receptors as well as tyrosine hydroxylase (an indicator of dopamine production), but not D2-like receptors may be associated with the regulation of physical activity in inbred mice.
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Affiliation(s)
- Amy M Knab
- Department of Kinesiology, University of North Carolina, Charlotte, NC, USA.
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Ashwin E, Ashwin C, Rhydderch D, Howells J, Baron-Cohen S. Eagle-eyed visual acuity: an experimental investigation of enhanced perception in autism. Biol Psychiatry 2009; 65:17-21. [PMID: 18649873 DOI: 10.1016/j.biopsych.2008.06.012] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2008] [Revised: 06/02/2008] [Accepted: 06/14/2008] [Indexed: 01/19/2023]
Abstract
BACKGROUND Anecdotal accounts of sensory hypersensitivity in individuals with autism spectrum conditions (ASC) have been noted since the first reports of the condition. Over time, empirical evidence has supported the notion that those with ASC have superior visual abilities compared with control subjects. However, it remains unclear whether these abilities are specifically the result of differences in sensory thresholds (low-level processing), rather than higher-level cognitive processes. METHODS This study investigates visual threshold in n = 15 individuals with ASC and n = 15 individuals without ASC, using a standardized optometric test, the Freiburg Visual Acuity and Contrast Test, to investigate basic low-level visual acuity. RESULTS Individuals with ASC have significantly better visual acuity (20:7) compared with control subjects (20:13)-acuity so superior that it lies in the region reported for birds of prey. CONCLUSIONS The results of this study suggest that inclusion of sensory hypersensitivity in the diagnostic criteria for ASC may be warranted and that basic standardized tests of sensory thresholds may inform causal theories of ASC.
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Affiliation(s)
- Emma Ashwin
- Autism Research Centre, Department of Psychiatry, University of Cambridge, Douglas House, Cambridge, United Kingdom.
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de Souza Silva MA, Topic B, Huston JP, Mattern C. Intranasal dopamine application increases dopaminergic activity in the neostriatum and nucleus accumbens and enhances motor activity in the open field. Synapse 2008; 62:176-84. [PMID: 18081176 DOI: 10.1002/syn.20484] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Dopamine (DA) plays an important role in a number of behavioral processes and neurological disorders. The intranasal administration of DA provides improved brain penetrability in comparison to systemic administration. We investigated the effects of intranasal administration of DA on the activity of dopaminergic neurons of the mesostriatal and mesolimbic systems and on motor activity. Rats previously implanted with guide-cannulae in the neostriatum (NS) and nucleus accumbens (NAc) were submitted to microdialysis procedure under urethane anesthesia. Vehicle or DA (0.03, 0.3, or 3.0 mg/kg) was administered bilaterally into the nostrils. In a separate study, animals received an intraperitoneal (i.p.) injection of vehicle or DA (0.03, 0.3, 3.0, or 30.0 mg/kg). Samples were collected every 10 min and analyzed for the content of DA and metabolites using high-performance liquid chromatography. For the open field study, rats were given intranasal vehicle or DA (0.03, 0.3, or 3.0 mg/kg) and placed into the field for 30 min. Motor activity (locomotion and rearing) and grooming were analyzed in blocks of 10 min using Ethovision. Intranasal DA (3.0 mg/kg) significantly increased DA levels in the NS and NAc immediately after administration. A comparable effect was obtained only after i.p. administration of 30 mg/kg DA. In the open field, the 3.0 mg/kg dose significantly decreased grooming behavior in the second 10 min interval and significantly increased locomotor activity in the third 10 min interval. The data indicate that intranasal administration of DA can influence dopaminergic functions and motor activity, and has a potential application in the therapy of diseases affecting the dopaminergic system.
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Affiliation(s)
- M A de Souza Silva
- Institute of Physiological Psychology and Center for Biological and Medical Research, University of Düsseldorf, Universitätsstrasse 1, Düsseldorf, Germany.
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Hall VJ, Li JY, Brundin P. Restorative cell therapy for Parkinson's disease: A quest for the perfect cell. Semin Cell Dev Biol 2007; 18:859-69. [DOI: 10.1016/j.semcdb.2007.09.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Accepted: 09/05/2007] [Indexed: 12/09/2022]
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Breitenstein C, Korsukewitz C, Flöel A, Kretzschmar T, Diederich K, Knecht S. Tonic dopaminergic stimulation impairs associative learning in healthy subjects. Neuropsychopharmacology 2006; 31:2552-64. [PMID: 16880771 DOI: 10.1038/sj.npp.1301167] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Endogenous dopamine plays a central role in salience coding during associative learning. Administration of the dopamine precursor levodopa enhances learning in healthy subjects and stroke patients. Because levodopa increases both phasic and tonic dopaminergic neurotransmission, the critical mechanism mediating the enhancement of learning is unresolved. We here probed how selective tonic dopaminergic stimulation affects associative learning. Forty healthy subjects were trained in a novel vocabulary of 45 concrete nouns over the course of 5 consecutive training days in a prospective, randomized, double-blind, placebo-controlled design. Subjects received the tonically stimulating dopamine-receptor agonist pergolide (0.1 mg) vs placebo 120 min before training on each training day. The dopamine agonist significantly impaired novel word learning compared to placebo. This learning decrement persisted up to the last follow-up 4 weeks post-training. Subjects treated with pergolide also showed restricted emotional responses compared to the PLACEBO group. The extent of 'flattened' affect with pergolide was related to the degree of learning inhibition. These findings suggest that tonic occupation of dopamine receptors impairs learning by competition with phasic dopamine signals. Thus, phasic signaling seems to be the critical mechanism by which dopamine enhances associative learning in healthy subjects and stroke patients.
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Allahham A, Stewart P, Marriott J, Mainwaring D. Factors affecting shear thickening behavior of a concentrated injectable suspension of levodopa. J Pharm Sci 2005; 94:2393-402. [PMID: 16200618 DOI: 10.1002/jps.20374] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Previous clinical studies on a subcutaneous injectable suspension of levodopa showed poor injectability into human tissue. When this formulation was rheologically characterised, a clinical shear thickening interval was observed at increased shear rates. The formulation parameters that contributed to this rheological behavior were systematically evaluated with the aim of removing this flow limitation while maintaining the concentration of 60% levodopa to retain the clinical applicability. The three suspension parameters examined were: levodopa volume fraction, concentration of the HPMC suspending vehicle, and particle size distribution. Shear thickening increased with the drug concentration and the critical shear rate was inversely dependent on the drug concentration. Increasing the vehicle concentration retarded the shear thickening but increased the overall suspension viscosity. There was an increase in shear thickening with increased average particle diameter. Combinations of micronized and non-micronized particles were used to prepare bimodal particle size distributions. The rheology of these bimodal distributions resulted in removal of shear thickening. This allowed the preparation of 60% levodopa formulations that showed a range of flow characteristics spanning near Newtonian flow or shear thinning at initial injectable viscosities of about 0.6 Pa.s and final viscosities in the range of 0.1 Pa.s, alleviating the shear thickening limitation of these levodopa formulations.
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Affiliation(s)
- Ayman Allahham
- Victorian College of Pharmacy, Monash University, Parkville 3104, Australia
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Platt DM, Rodefer JS, Rowlett JK, Spealman RD. Suppression of cocaine- and food-maintained behavior by the D2-like receptor partial agonist terguride in squirrel monkeys. Psychopharmacology (Berl) 2003; 166:298-305. [PMID: 12589523 DOI: 10.1007/s00213-002-1347-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2002] [Accepted: 11/08/2002] [Indexed: 10/20/2022]
Abstract
RATIONALE The D2-like receptor partial agonist terguride has a profile of behavioral effects in rats that suggests potential benefit as a pharmacotherapy for cocaine addiction. OBJECTIVES The present study investigated the effects of terguride on cocaine- and food-maintained behavior in squirrel monkeys. METHODS Squirrel monkeys were trained to respond on a second-order schedule (FI 10 min, FR 10 or 30:S) of either i.v. cocaine injection or food pellet delivery. Additional monkeys were studied using quantitative observational techniques to construct side effect profiles. Under each procedure, the effects of terguride were compared with those of the reference D2-like receptor antagonist nemonapride and the D2-like receptor full agonist quinpirole. RESULTS Terguride and nemonapride, but not quinpirole, dose-dependently reduced cocaine-maintained behavior. In animals self-administering food, terguride decreased response rates at doses lower than those required to suppress cocaine-maintained behavior. Effective doses of terguride had no systematic effect on motor activity or muscle rigidity, whereas effective doses of nemonapride virtually eliminated motor activity and induced severe catalepsy. The primary observable effects of terguride were a modest increase in self-directed behavior (a D2-receptor agonist-like effect) at intermediate doses and a small increase in static posture (a D2-receptor antagonist-like effect) at the highest dose tested. CONCLUSIONS The results suggest that terguride has advantages over conventional D2-like receptor antagonists and agonists as a candidate pharmacotherapy for cocaine abuse; however, terguride significantly reduces food-maintained behavior at lower doses than those needed to decrease cocaine-maintained behavior suggesting limitations on the utility of terguride as a medication for cocaine addiction.
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Affiliation(s)
- Donna M Platt
- New England Regional Primate Research Center, Harvard Medical School, One Pine Hill Drive, PO Box 9102, MA 01772-9102, Southborough, USA.
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Abstract
Dopamine is a small and relatively simple molecule that fulfills diverse functions. Within the brain, it acts as a classical neurotransmitter whose attenuation or overactivity can result in disorders such as Parkinson's disease and schizophrenia. Major advances in the cloning and characterization of biosynthetic enzymes, transporters, and receptors have increased our knowledge regarding the metabolism, release, reuptake, and mechanism of action of dopamine. Dopamine reaches the pituitary via hypophysial portal blood from several hypothalamic nerve tracts that are regulated by PRL itself, estrogens, and several neuropeptides and neurotransmitters. Dopamine binds to type-2 dopamine receptors that are functionally linked to membrane channels and G proteins and suppresses the high intrinsic secretory activity of the pituitary lactotrophs. In addition to inhibiting PRL release by controlling calcium fluxes, dopamine activates several interacting intracellular signaling pathways and suppresses PRL gene expression and lactotroph proliferation. Thus, PRL homeostasis should be viewed in the context of a fine balance between the action of dopamine as an inhibitor and the many hypothalamic, systemic, and local factors acting as stimulators, none of which has yet emerged as a primary PRL releasing factor. The generation of transgenic animals with overexpressed or mutated genes expanded our understanding of dopamine-PRL interactions and the physiological consequences of their perturbations. PRL release in humans, which differs in many respects from that in laboratory animals, is affected by several drugs used in clinical practice. Hyperprolactinemia is a major neuroendocrine-related cause of reproductive disturbances in both men and women. The treatment of hyperprolactinemia has greatly benefited from the generation of progressively more effective and selective dopaminergic drugs.
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Affiliation(s)
- N Ben-Jonathan
- Department of Cell Biology, Neurobiology, and Anatomy, University of Cincinnati Medical Center, Cincinnati, Ohio 45267, USA.
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Baas H, Zehrden F, Selzer R, Kohnen R, Loetsch J, Harder S. Pharmacokinetic-pharmacodynamic relationship of levodopa with and without tolcapone in patients with Parkinson's disease. Clin Pharmacokinet 2001; 40:383-93. [PMID: 11432539 DOI: 10.2165/00003088-200140050-00005] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
OBJECTIVE To investigate the effect of administration of the catechol-Omethyltransferase (COMT) inhibitor tolcapone on the concentration-effect relationship of levodopa in patients with advanced Parkinson's disease and on-off fluctuations. DESIGN Nonblind single-group 2-period pharmacokinetic-pharmacodynamic study. PATIENTS AND PARTICIPANTS 12 patients, mean age 59 years, with idiopathic Parkinson's disease and response fluctuations. METHODS The pharmacokinetics [plasma concentrations of levodopa and 3-O-methyldopa (3-OMD)] and motor effects [global score of the Columbia University Rating Scale (CURSsigma)] of levodopa (plus the peripheral decarboxylase inhibitor benserazide 1:4) were determined for 4 consecutive dosage intervals (4 hours each, starting at 8.00am) in 12 patients before (day 1) and during (day 8) coadministration of tolcapone 100 mg 3 times daily for 7 days. RESULTS Under tolcapone, exposure to levodopa [area under the plasma concentration-time for the dosage interval (AUCt)] observed for the separate doses increased by 1.6- to 2.2-fold, and peak plasma drug concentrations (Cmax) increased by 1.1 - to 2.1 -fold. 3-OMD concentrations at day 8 were reduced to about 20% of the values at day 1. At baseline (day 1, before the first levodopa dose), CURSsigma averaged 40 +/- 10 points. After the first levodopa dose. CURSsigma declined to 20 +/- 9 points. At day 8. the predose CURSsigma decreased to a final score of 31 +/-13 points, and the maximal decline after the first levodopa dose was to a final score of 16 +/- 8 points. Population analysis (NONMEM) of the concentration-effect relationship of levodopa according to a sigmoidal Emax model and over all dosage intervals did not show differences in levodopa responsiveness with or without tolcapone. The population mean of the 50% effective concentration (EC50) of levodopa was 1350 microg/L with an standard error of the population parameter estimate of 18%: adding tolcapone treatment as a covariate did not significantly change the population fit. Circadian influences on levodopa respon- siveness were not evaluable by the NONMEM model due to overparametrisation, but visual inspection of plotted data did not suggest differences in the concentration-effect relationship between the 4 consecutive dosage intervals on days 1 and 8. CONCLUSIONS The gain in clinical improvement with levodopa under tolcapone can be fully explained by tolcapone-induced changes of peripheral levodopa pharmacokinetics. We suggest that this interaction study, performed in patients and using clinical data, excludes any central effects of tolcapone or any inhibiting effect of 3-OMD on levodopa permeation through the blood-brain barrier, which otherwise would have led to a decrease in the EC50 of levodopa.
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Affiliation(s)
- H Baas
- Clinic for Neurology and Neurogeriatry, Community Hospital, Hanau, Germany
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Dahlin M, Jansson B, Björk E. Levels of dopamine in blood and brain following nasal administration to rats. Eur J Pharm Sci 2001; 14:75-80. [PMID: 11457653 DOI: 10.1016/s0928-0987(01)00151-8] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The aim of this study was to investigate the levels of [(3)H]dopamine in blood, the cerebrospinal fluid (CSF) and brain tissue samples in rats and to find out whether the drug is transferred along the olfactory pathway to the central nervous system following nasal administration. [(3)H]Dopamine (50 microCi) was given to male Sprague-Dawley rats either intravenously or nasally to the right nostril. For the absorption study, blood samples were withdrawn from the carotid artery. The CSF samples were taken by cisternal puncture and then brain tissue samples were excised. The presence of unchanged dopamine in the samples was ascertained using thin layer chromatography (TLC). The radioactivity in the samples was measured using liquid scintillation. The greatest amount of the total radioactivity absorbed from the nasal mucosa into the systemic circulation was observed at the first sampling point 15 min after administration. The bioavailability of the total radioactivity was 68+/-30%. The uptake of [(3)H]dopamine in the brain was significantly higher 30 min after nasal administration than after intravenous administration (P<0.01). TLC data showed that approximately 59%, 14% and 68% of the radioactivity in the olfactory bulb, CSF and olfactory mucosa, respectively, coeluted with dopamine. In conclusion, these results show that unchanged dopamine is transferred into the olfactory bulb via the olfactory pathway in rats.
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Affiliation(s)
- M Dahlin
- Department of Pharmacy, Division of Pharmaceutics, Biomedical Centre, Box 580, Uppsala University, SE-751 23, Uppsala, Sweden
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Miyai I, Fujimoto Y, Ueda Y, Yamamoto H, Nozaki S, Saito T, Kang J. Treadmill training with body weight support: its effect on Parkinson's disease. Arch Phys Med Rehabil 2000; 81:849-52. [PMID: 10895994 DOI: 10.1053/apmr.2000.4439] [Citation(s) in RCA: 227] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVE To test whether body weight-supported treadmill training (BWSTT) is effective in improving functional outcome of patients with Parkinson's disease. DESIGN Prospective crossover trial. Patients were randomized to receive either a 4-week program of BWSTT with up to 20% of their body weight supported followed by 4 weeks of conventional physical therapy (PT), or the same treatments in the opposite order. Medications for parkinsonism were not modified throughout the study. SETTING Inpatient rehabilitation unit for neurologic diseases. SUBJECTS Ten patients (5 men, 5 women) with Hoehn and Yahr stage 2.5 or 3 parkinsonism; mean age 67.6 years, mean duration of Parkinson's disease 4.2 years. MAIN OUTCOME MEASURES The Unified Parkinson's Disease Rating Scale (UPDRS), ambulation endurance and speed (sec/10 m), and number of steps for 10-meter walk. RESULTS The mean total UPDRS before/after BWSTT was 31.6/25.6, and before/after PT was 29.1/28.0. Analysis of covariance for improvement of UPDRS demonstrated a significant effect of type of therapy (F(1, 16) = 42.779, p < .0001) but not order of therapy (F(1, 16) = 0.157, p = .697 1). Patients also had significantly greater improvement with BWSTT than with PT in ambulation speed (BWSTT, before/after = 10.0/8.3; PT, 9.5/8.9), and number of steps (BWSTT, 22.3/19.6; PT, 21.5/20.8). CONCLUSIONS In persons with Parkinson's disease, treadmill training with body weight support produces greater improvement in activities of daily living, motor performance, and ambulation than does physical therapy.
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Affiliation(s)
- I Miyai
- Department of Neurology, Toneyama National Hospital, Osaka, Japan
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