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Antidepressant-Like Properties of Intrastriatal Botulinum Neurotoxin-A Injection in a Unilateral 6-OHDA Rat Model of Parkinson's Disease. Toxins (Basel) 2021; 13:toxins13070505. [PMID: 34357977 PMCID: PMC8310221 DOI: 10.3390/toxins13070505] [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: 06/17/2021] [Revised: 07/09/2021] [Accepted: 07/14/2021] [Indexed: 12/14/2022] Open
Abstract
Parkinson’s patients often suffer from depression and anxiety, for which there are no optimal treatments. Hemiparkinsonian (hemi-PD) rats were used to test whether intrastriatal Botulinum neurotoxin-A (BoNT-A) application could also have antidepressant-like properties in addition to the known improvement of motor performance. To quantify depression- and anxiety-like behavior, the forced swim test, tail suspension test, open field test, and elevated plus maze test were applied to hemi-PD rats injected with BoNT-A or vehicle. Furthermore, we correlated the results in the forced swim test, open field test, and elevated plus maze test with the rotational behavior induced by apomorphine and amphetamine. Hemi-PD rats did not show significant anxiety-like behavior as compared with Sham 6-OHDA- + Sham BoNT-A-injected as well as with non-injected rats. However, hemi-PD rats demonstrated increased depression-like behaviors compared with Sham- or non-injected rats; this was seen by increased struggling frequency and increased immobility frequency. Hemi-PD rats intrastriatally injected with BoNT-A exhibited reduced depression-like behavior compared with the respective vehicle-receiving hemi-PD animals. The significant effects of intrastriatally applied BoNT-A seen in the forced swim test are reminiscent of those found after various antidepressant drug therapies. Our data correspond with the efficacy of BoNT-A treatment of glabellar frown lines in treating patients with major depression and suggest that also intrastriatal injected BoNT-A may have some antidepressant-like effect on hemi-PD.
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Krasko MN, Hoffmeister JD, Schaen-Heacock NE, Welsch JM, Kelm-Nelson CA, Ciucci MR. Rat Models of Vocal Deficits in Parkinson's Disease. Brain Sci 2021; 11:brainsci11070925. [PMID: 34356159 PMCID: PMC8303338 DOI: 10.3390/brainsci11070925] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/08/2021] [Accepted: 07/09/2021] [Indexed: 12/21/2022] Open
Abstract
Parkinson's disease (PD) is a progressive, degenerative disorder that affects 10 million people worldwide. More than 90% of individuals with PD develop hypokinetic dysarthria, a motor speech disorder that impairs vocal communication and quality of life. Despite the prevalence of vocal deficits in this population, very little is known about the pathological mechanisms underlying this aspect of disease. As such, effective treatment options are limited. Rat models have provided unique insights into the disease-specific mechanisms of vocal deficits in PD. This review summarizes recent studies investigating vocal deficits in 6-hydroxydopamine (6-OHDA), alpha-synuclein overexpression, DJ1-/-, and Pink1-/- rat models of PD. Model-specific changes to rat ultrasonic vocalization (USV), and the effects of exercise and pharmacologic interventions on USV production in these models are discussed.
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Affiliation(s)
- Maryann N. Krasko
- Department of Surgery, University of Wisconsin-Madison, Madison, WI 53792, USA; (M.N.K.); (J.D.H.); (N.E.S.-H.); (J.M.W.); (C.A.K.-N.)
- Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jesse D. Hoffmeister
- Department of Surgery, University of Wisconsin-Madison, Madison, WI 53792, USA; (M.N.K.); (J.D.H.); (N.E.S.-H.); (J.M.W.); (C.A.K.-N.)
- Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Nicole E. Schaen-Heacock
- Department of Surgery, University of Wisconsin-Madison, Madison, WI 53792, USA; (M.N.K.); (J.D.H.); (N.E.S.-H.); (J.M.W.); (C.A.K.-N.)
- Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jacob M. Welsch
- Department of Surgery, University of Wisconsin-Madison, Madison, WI 53792, USA; (M.N.K.); (J.D.H.); (N.E.S.-H.); (J.M.W.); (C.A.K.-N.)
| | - Cynthia A. Kelm-Nelson
- Department of Surgery, University of Wisconsin-Madison, Madison, WI 53792, USA; (M.N.K.); (J.D.H.); (N.E.S.-H.); (J.M.W.); (C.A.K.-N.)
| | - Michelle R. Ciucci
- Department of Surgery, University of Wisconsin-Madison, Madison, WI 53792, USA; (M.N.K.); (J.D.H.); (N.E.S.-H.); (J.M.W.); (C.A.K.-N.)
- Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, WI 53706, USA
- Neuroscience Training Program, University of Wisconsin-Madison, Madison, WI 53705, USA
- Correspondence:
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Lee JY, Kim HS, Kim SH, Kim HS, Cho BP. Combination of Human Mesenchymal Stem Cells and Repetitive Transcranial Magnetic Stimulation Enhances Neurological Recovery of 6-Hydroxydopamine Model of Parkinsonian's Disease. Tissue Eng Regen Med 2020; 17:67-80. [PMID: 31970698 DOI: 10.1007/s13770-019-00233-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 11/23/2019] [Accepted: 11/28/2019] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND Repetitive transcranial magnetic stimulation (rTMS) has been in use for the treatment of various neurological diseases, including depression, anxiety, stroke and Parkinson's disease (PD), while its underlying mechanism is stills unclear. This study was undertaken to evaluate the potential synergism of rTMS treatment to the beneficial effect of human mesenchymal stem cells (hMSCs) administration for PD and to clarify the mechanism of action of this therapeutic approach. METHODS The neuroprotective effect in nigral dopamine neurons, neurotrophic/growth factors and anti-/pro-inflammatory cytokine regulation, and functional recovery were assessed in the rat 6-hydroxydopamine (6-OHDA) model of PD upon administration of hMSCs and rTMS. RESULTS Transplanted hMSCs were identified in the substantia nigra, and striatum. Enhancement of the survival of SN dopamine neurons and the expression of the tyrosine hydroxylase protein were observed in the hMSCs + rTMS compared to that of controls. Combination therapy significantly elevated the expression of several key neurotrophic factors, of which the highest expression was recorded in the rTMS + hMSC group. In addition, the combination therapy significantly upregulated IL-10 expression while decreased IFN-γ and TNF-α production in a synergistic manner. The treadmill locomotion test (TLT) revealed that motor function was improved in the rTMS + hMSC treatment with synergy. CONCLUSION Our findings demonstrate that rTMS treatment and hMSC transplantation could synergistically create a favorable microenvironment for cell survival within the PD rat brain, through alteration of soluble factors such as neurotrophic/growth factors and anti-/pro-inflammatory cytokines related to neuronal protection or repair, with preservation of DA neurons and improvement of motor functions.
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Affiliation(s)
- Ji Yong Lee
- Department of Anatomy, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, Republic of Korea
| | - Hyun Soo Kim
- FCB-Pharmicell Co. Ltd., 520 Sicox Tower, 484 Dunchon-daero, Jungwon-gu, Seongnam-si, Gyeonggi-do, 13229, Republic of Korea
| | - Sung Hoon Kim
- Department and Rehabilitation Medicine, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, Republic of Korea
| | - Han-Soo Kim
- Department of Biomedical Sciences, Catholic Kwandong University College of Medical Convergence, 24 Beomil-ro, 579 beon-gil, Gangneung-Si, Gangwon-do, 25601, Republic of Korea.
- Basic Research Division, Biomedical Institute of Mycological Resource, College of Medicine, Catholic Kwandong University, 24 Beomil-ro, 579 beon-gil, Gangneung-Si, Gangwon-do, 25601, Republic of Korea.
| | - Byung Pil Cho
- Department of Anatomy, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, Republic of Korea.
- Institute of Lifestyle Medicine, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, Republic of Korea.
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Theoret JK, Jadavji NM, Zhang M, Smith PD. Granulocyte macrophage colony-stimulating factor treatment results in recovery of motor function after white matter damage in mice. Eur J Neurosci 2015; 43:17-24. [PMID: 26474338 DOI: 10.1111/ejn.13105] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 09/29/2015] [Accepted: 10/13/2015] [Indexed: 11/30/2022]
Abstract
Clinical stroke usually results from a cerebral ischaemic event, and is frequently a debilitating condition with limited treatment options. A significant proportion of clinical strokes result from specific damage to the subcortical white matter (SWM), but currently there are few animal models available to investigate the pathogenesis and potential therapeutic strategies to promote recovery. Granulocyte macrophage colony-stimulating factor (GM-CSF) is a cytokine that has been previously shown to promote neuroprotective effects after brain damage; however, the mechanisms mediating this effect are not known. Here, it is reported that GM-CSF treatment results in dramatic functional improvement in a white matter model of stroke in mice. SWM stroke was induced in mice by unilateral injections of the vasoconstrictor, endothelin-1 (ET-1). The results reveal that ET-1-induced stroke impairs skilled motor function on the single pellet-reaching task and results in forelimb asymmetry, in adult mice. Treatment with GM-CSF, after stroke, restores motor function and abolishes forelimb asymmetry. The results also indicate that GM-CSF promotes its effects by activating mammalian target of rapamycin signalling mechanisms in the brain following stroke injury. Additionally, a significant increase in GM-CSF receptor expression was found in the ipsilateral hemisphere of the ET-1-injected brain. Taken together, the present study highlights the use of an under-utilized mouse model of stroke (using ET-1) and suggests that GM-CSF treatment can attenuate ET-1-induced functional deficits.
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Affiliation(s)
- Jennifer K Theoret
- Neuroscience Department, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada
| | - Nafisa M Jadavji
- Neuroscience Department, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada
| | - Min Zhang
- Neuroscience Department, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada
| | - Patrice D Smith
- Neuroscience Department, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada
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Johnson AM, Grant LM, Schallert T, Ciucci MR. Changes in Rat 50-kHz Ultrasonic Vocalizations During Dopamine Denervation and Aging: Relevance to Neurodegeneration. Curr Neuropharmacol 2015; 13:211-9. [PMID: 26411763 PMCID: PMC4598432 DOI: 10.2174/1570159x1302150525122416] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/13/2014] [Accepted: 10/16/2014] [Indexed: 11/22/2022] Open
Abstract
Vocal communication is negatively affected by neurodegenerative diseases, such as Parkinson disease, and by aging. The neurological and sensorimotor mechanisms underlying voice deficits in Parkinson disease and aging are not well-understood. Rat ultrasonic vocalizations provide a unique behavioral model for studying communication deficits and the mechanisms underlying these deficits in these conditions. The purpose of this review was to examine the existing literature for methods using rat ultrasonic vocalization with regard to the primary disease pathology of Parkinson disease, dopamine denervation, and aging. Although only a small amount of papers were found for each of these topics, results suggest that both shared and unique acoustic deficits in ultrasonic vocalizations exist across conditions and that these acoustic deficits are due to changes in either dopamine signaling or denervation and in aging models changes to the nucleus ambiguus, at the level of the neuromuscular junction, and the composition of the vocal folds in the larynx. We conclude that ultrasonic vocalizations are a useful tool for studying biologic mechanisms underlying vocal communication deficits in neurodegenerative diseases and aging.
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Therapeutic effects of repetitive transcranial magnetic stimulation in an animal model of Parkinson's disease. Brain Res 2013; 1537:290-302. [PMID: 23998987 DOI: 10.1016/j.brainres.2013.08.051] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Revised: 07/24/2013] [Accepted: 08/26/2013] [Indexed: 01/08/2023]
Abstract
Repetitive transcranial magnetic stimulation (rTMS) is used to treat neurological diseases such as stroke and Parkinson's disease (PD). Although rTMS has been used clinically, its underlying therapeutic mechanism remains unclear. The objective of the present study was to clarify the neuroprotective effect and therapeutic mechanism of rTMS in an animal model of PD. Adult Sprague-Dawley rats were unilaterally injected with 6-hydroxydopamine (6-OHDA) into the right striatum. Rats with PD were then treated with rTMS (circular coil, 10 Hz, 20 min/day) daily for 4 weeks. Behavioral assessments such as amphetamine-induced rotational test and treadmill locomotion test were performed, and the dopaminergic (DA) neurons of substantia nigra pas compacta (SNc) and striatum were histologically examined. Expression of neurotrophic/growth factors was also investigated by multiplex ELISA, western blotting analysis and immunohistochemistry 4 weeks after rTMS application. Among the results, the number of amphetamine-induced rotations was significantly lower in the rTMS group than in the control group at 4 weeks post-treatment. Treadmill locomotion was also significantly improved in the rTMS-treated rats. Tyrosine hydroxylase-positive DA neurons and DA fibers in rTMS group rats were greater than those in untreated group in both ipsilateral SNc and striatum, respectively. The expression levels of brain-derived neurotrophic factor, glial cell line-derived neurotrophic factor, platelet-derived growth factor, and vascular endothelial growth factor were elevated in both the 6-OHDA-injected hemisphere and the SNc of the rTMS-treated rats. In conclusion, rTMS treatment improved motor functions and survival of DA neurons, suggesting that the neuroprotective effect of rTMS treatment might be induced by upregulation of neurotrophic/growth factors in the PD animal model.
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Mendieta L, Bautista E, Sánchez A, Guevara J, Herrando-Grabulosa M, Moran J, Martínez R, Aguilera J, Limón ID. The C-terminal domain of the heavy chain of tetanus toxin given by intramuscular injection causes neuroprotection and improves the motor behavior in rats treated with 6-hydroxydopamine. Neurosci Res 2012; 74:156-67. [DOI: 10.1016/j.neures.2012.08.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 08/21/2012] [Accepted: 08/24/2012] [Indexed: 12/24/2022]
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McDowell K, Chesselet MF. Animal models of the non-motor features of Parkinson's disease. Neurobiol Dis 2012; 46:597-606. [PMID: 22236386 PMCID: PMC3442929 DOI: 10.1016/j.nbd.2011.12.040] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Revised: 12/17/2011] [Accepted: 12/22/2011] [Indexed: 12/21/2022] Open
Abstract
The non-motor symptoms (NMS) of Parkinson's disease (PD) occur in roughly 90% of patients, have a profound negative impact on their quality of life, and often go undiagnosed. NMS typically involve many functional systems, and include sleep disturbances, neuropsychiatric and cognitive deficits, and autonomic and sensory dysfunction. The development and use of animal models have provided valuable insight into the classical motor symptoms of PD over the past few decades. Toxin-induced models provide a suitable approach to study aspects of the disease that derive from the loss of nigrostriatal dopaminergic neurons, a cardinal feature of PD. This also includes some NMS, primarily cognitive dysfunction. However, several NMS poorly respond to dopaminergic treatments, suggesting that they may be due to other pathologies. Recently developed genetic models of PD are providing new ways to model these NMS and identify their mechanisms. This review summarizes the current available literature on the ability of both toxin-induced and genetically-based animal models to reproduce the NMS of PD.
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Affiliation(s)
- Kimberly McDowell
- Department of Neurology, The David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1769, USA
| | - Marie-Françoise Chesselet
- Department of Neurology, The David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1769, USA
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Fernandes VS, Santos JR, Leão AH, Medeiros AM, Melo TG, Izídio GS, Cabral A, Ribeiro RA, Abílio VC, Ribeiro AM, Silva RH. Repeated treatment with a low dose of reserpine as a progressive model of Parkinson's disease. Behav Brain Res 2012; 231:154-63. [DOI: 10.1016/j.bbr.2012.03.008] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 03/06/2012] [Accepted: 03/07/2012] [Indexed: 11/26/2022]
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Bethel-Brown CS, Morris JK, Stanford JA. Young and middle-aged rats exhibit isometric forelimb force control deficits in a model of early-stage Parkinson's disease. Behav Brain Res 2011; 225:97-103. [PMID: 21767573 DOI: 10.1016/j.bbr.2011.07.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2011] [Revised: 06/28/2011] [Accepted: 07/02/2011] [Indexed: 11/19/2022]
Abstract
Deficits in manual motor control often accompany the early stages of Parkinson's disease (PD), and are often revealed through isometric force tasks. In order to determine whether similar deficits occur in a rat model of early-stage PD, young (8 months) and middle-aged (18 months) rats were trained to produce sustained press-hold-release isometric forelimb responses that allowed for analyses of force output and spectral analysis of forelimb stability and tremor. Rats then received a 6-hydroxydopamine (6-OHDA) infusion into the striatum contralateral to the trained forelimb and were tested for 4 weeks post-lesion. The resulting partial striatal dopamine depletions (which at 41±12% and 43±6% in young and middle-aged rats, respectively, did not differ between the two groups) resulted in isometric forelimb deficits. Specifically, rats exhibited significantly diminished force stability and increased high frequency (10-25Hz) tremor, indicating potential postural disturbances and increased postural tremor, respectively. Durations of press-hold-release bouts were also increased post-lesion, suggesting difficulty in task disengagement. Despite pre-lesion differences in some of the force measures, the effects of partial nigrostriatal DA depletion did not differ between the two age groups. These results support the use of the press-while-licking task in preclinical studies modeling isometric force control deficits in PD.
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Affiliation(s)
- Crystal S Bethel-Brown
- Departments of Molecular & Integrative Physiology, University of Kansas Medical Center, Kansas City, KS 66160, United States
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Meredith GE, Sonsalla PK, Chesselet MF. Animal models of Parkinson's disease progression. Acta Neuropathol 2008; 115:385-98. [PMID: 18273623 DOI: 10.1007/s00401-008-0350-x] [Citation(s) in RCA: 163] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2007] [Revised: 01/30/2008] [Accepted: 01/31/2008] [Indexed: 12/21/2022]
Abstract
Parkinson's disease (PD) is a progressive neurodegenerative disorder whose etiology is not understood. This disease occurs both sporadically and through inheritance of single genes, although the familial types are rare. Over the past decade or so, experimental and clinical data suggest that PD could be a multifactorial, neurodegenerative disease that involves strong interactions between the environment and genetic predisposition. Our understanding of the pathophysiology and motor deficits of the disease relies heavily on fundamental research on animal models and the last few years have seen an explosion of toxin-, inflammation-induced and genetically manipulated models. The insight gained from the use of such models has strongly advanced our understanding of the progression and stages of the disease. The models have also aided the development of novel therapies to improve symptomatic management, and they are critical for the development of neuroprotective strategies. This review critically evaluates these in vivo models and the roles they play in mimicking the progression of PD.
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Affiliation(s)
- Gloria E Meredith
- Department of Cellular and Molecular Pharmacology, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL 60064, USA.
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Ding Y, Restrepo J, Won L, Hwang DY, Kim KS, Kang UJ. Chronic 3,4-dihydroxyphenylalanine treatment induces dyskinesia in aphakia mice, a novel genetic model of Parkinson's disease. Neurobiol Dis 2007; 27:11-23. [PMID: 17499513 PMCID: PMC2570533 DOI: 10.1016/j.nbd.2007.03.013] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 02/25/2007] [Accepted: 03/17/2007] [Indexed: 11/26/2022] Open
Abstract
L-DOPA-induced dyskinesia (LID) is one of the main limitations of long term L-DOPA use in Parkinson's disease (PD) patients. We show that chronic L-DOPA treatment induces novel dyskinetic behaviors in aphakia mouse with selective nigrostriatal deficit mimicking PD. The stereotypical abnormal involuntary movements were induced by dopamine receptor agonists and attenuated by antidyskinetic agents. The development of LID was accompanied by preprodynorphin and preproenkephalin expression changes in the denervated dorsal striatum. Increased FosB-expression was also noted in the dorsal striatum. In addition, FosB expression was noted in the pedunculopontine nucleus and the zona incerta, structures previously not examined in the setting of LID. The aphakia mouse is a novel genetic model with behavioral and biochemical characteristics consistent with those of PD dyskinesia and provides a more consistent, convenient, and physiologic model than toxic lesion models to study the mechanism of LID and to test therapeutic approaches for LID.
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Affiliation(s)
- Yunmin Ding
- Department of Neurology, University of Chicago, Chicago, Illinois 60637
| | | | - Lisa Won
- Department of Neurology, University of Chicago, Chicago, Illinois 60637
| | - Dong-Youn Hwang
- Molecular Neurobiology Laboratory, McLean Hospital and Harvard Medical School, Belmont, Massachusetts, 02478
| | - Kwang-Soo Kim
- Molecular Neurobiology Laboratory, McLean Hospital and Harvard Medical School, Belmont, Massachusetts, 02478
| | - Un Jung Kang
- Department of Neurology, University of Chicago, Chicago, Illinois 60637
- Committee on Neurobiology, University of Chicago, Chicago, Illinois 60637
- Corresponding author with complete address, including an email address: *: Un Jung Kang,
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Phillips JM, Lam HA, Ackerson LC, Maidment NT. Blockade of mGluR glutamate receptors in the subthalamic nucleus ameliorates motor asymmetry in an animal model of Parkinson's disease. Eur J Neurosci 2006; 23:151-60. [PMID: 16420425 DOI: 10.1111/j.1460-9568.2005.04550.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
It has been suggested that Group I metabotropic glutamate receptor antagonists could have potential therapeutic value in the treatment of Parkinson's disease. There is evidence that when given systemically, 2-methyl-6-(phenylethynyl)-pyridine (MPEP), a metabotropic glutamate receptor type 5 (mGluR5) antagonist, produces anti-parkinsonian effects in animal models, but the site of action has not been directly established. In the present study, we examined whether the subthalamic nucleus (STN) and its output structures may mediate such an effect using a unilateral rat model of Parkinson's disease. A battery of simple behavioral tests, reliably sensitive to dopamine depletion, was applied consecutively: (i) prior to surgery; (ii) 3 weeks following a unilateral 6-hydroxydopamine lesion of the substantia nigra pars compacta; (iii) at 1 h, 24 h and 4 days following a microinjection of MPEP, via an indwelling cannula, into the STN, entopeduncular nucleus (EP) or substantia nigra zona reticulata. Unilaterally dopamine-depleted animals typically had severe motor and sensorimotor asymmetries 3 weeks following surgery. Microinjection of 25 nmol MPEP into the STN of these animals significantly attenuated these asymmetries relative to vehicle. Further microinjections of lower doses (5 and 10 nmol) revealed a dose-response effect. Microinjection of MPEP into either the EP or substantia nigra zona reticulata was without effect. These data suggest that MPEP may act at the level of the STN to reduce glutamatergic overactivity and thereby induce anti-parkinsonian effects.
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Affiliation(s)
- Janice M Phillips
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California at Los Angeles, 760 Westwood Plaza, Los Angeles, CA 90024, USA
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Poulton NP, Muir GD. Treadmill training ameliorates dopamine loss but not behavioral deficits in hemi-parkinsonian rats. Exp Neurol 2005; 193:181-97. [PMID: 15817277 DOI: 10.1016/j.expneurol.2004.12.006] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2004] [Revised: 11/19/2004] [Accepted: 12/06/2004] [Indexed: 01/26/2023]
Abstract
The purpose of this study was to investigate whether locomotor training could ameliorate neurochemical changes and behavioral deficits in the 6-hydroxydopamine (6-OHDA) rat model of Parkinson's disease. It has been recently demonstrated that forelimb motor training, or brief treadmill training, can attenuate dopamine loss and some deficits in forelimb usage in this animal model. Nevertheless, it is not known whether locomotor training could result in an amelioration of locomotor deficits. Rats were lesioned with 6-OHDA injected intracerebrally and randomly assigned to one of 3 groups: early treadmill trained, late treadmill trained and untrained. Animals in the early trained group underwent 2 x 20 min treadmill sessions daily for 30 days, beginning 24 h after 6-OHDA injection. Late trained animals underwent the same training regime beginning 7 days post-injection. All animals were assessed on their abilities to perform several behavioral tasks designed to test locomotor and forelimb movement abilities prior to 6-OHDA injection and at 3 and 6 weeks post-injection. Treadmill training resulted in the attenuation of dopamine depletion in the striatum compared to non-treadmill trained animals, as measured by in vivo apomorphine-induced rotations and post-mortem dopamine analysis. Nevertheless, treadmill training produced essentially no difference in behavioral deficits on most tests compared to untrained animals. We discuss the possible reasons for the discrepancies with previous studies, including differences in lesioning, training regimes and methods of behavioral assessment. We conclude that treadmill training does not ameliorate locomotor deficits in the 6-OHDA model of Parkinson's disease, even though this same training results in attenuation of dopamine loss in the striatum.
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Affiliation(s)
- Nadine P Poulton
- Biomedical Sciences, WCVM, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK, Canada S7N 5B4
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Whishaw IQ, Piecharka DM, Zeeb F, Stein DG. Unilateral frontal lobe contusion and forelimb function: chronic quantitative and qualitative impairments in reflexive and skilled forelimb movements in rats. J Neurotrauma 2005; 21:1584-600. [PMID: 15684651 DOI: 10.1089/neu.2004.21.1584] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Traumatic brain injury induced by mechanical impacts of the head can be modeled in rats in order to investigate acute and chronic therapy. Because frontal lobe contusion affects the neural representation of the forelimb in both the neocortex and basal ganglia, the purpose of the present experiments was to examine the chronic changes in reflexive and skilled forelimb induced by the injury. Contusions produced a cavity in the sensorimotor cortex, accompanied by shrinkage of the pyramidal tract, loss of cells in the dorsolateral striatum, and enlargement of the lateral ventricle. There were substantial individual differences in lesion size despite use of two different contusion forces, but all rats receiving contusions displayed chronic forelimb deficits. Reflexive tests of forelimb use (limb posture, placing, and support) indicated that impairments were most pronounced in the forelimb contralateral to the lesion. Tests of limb preference indicated that the contusion rats displayed a forelimb asymmetry: they were more likely to lean on their ipsilateral-to-lesion forelimb for support when rearing in a test cylinder, and this impairment was amplified in a home cage test. They also displayed a preference for the forelimb ipsilateral to the lesion when reaching for food, although both forelimbs were equally impaired on measures of success when reaching for food from a tray and reaching for a single food pellet on a shelf. A qualitative analysis from frame-by-frame video records indicated that when reaching for single pellets, impairments in forelimb use primarily affected the contralateral-to-lesion limb, especially limb aiming, supination, and food pellet release. Impairments in the ipsilateral-to-lesion forelimb were generally, but not exclusively, secondary to postural abnormalities. The wide range of chronic impairments in forelimb use following contusion injuries are discussed in relation to the anatomical and behavioral origins of the impairments and the potential use of forelimb tests in the assessment of therapy for traumatic brain injury to the frontal cortex.
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Affiliation(s)
- Ian Q Whishaw
- Canadian Centre for Behavioural Neuroscience, University of Lethbridge, Lethbridge, Alberta, Canada.
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Fleming SM, Delville Y, Schallert T. An intermittent, controlled-rate, slow progressive degeneration model of Parkinson's disease: antiparkinson effects of Sinemet and protective effects of methylphenidate. Behav Brain Res 2005; 156:201-13. [PMID: 15582106 DOI: 10.1016/j.bbr.2004.05.024] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2003] [Revised: 05/18/2004] [Accepted: 05/20/2004] [Indexed: 12/21/2022]
Abstract
The causes of nigrostriatal neuron degeneration in Parkinson's disease (PD) are not known, but it has been suggested that exogenous or endogenous factors or neurotoxins may play a role. The degree of vulnerability to neurotoxins or other potential mediators of nigral dopamine cell death is thought to be important in understanding Parkinson's disease. In most animal models, the rate of terminal degeneration and corresponding functional impairment is too rapid to investigate effectively either cell vulnerability or the potential benefits of some neuroprotective treatments. In the present study, a new model of Parkinson's disease is described that might help in addressing the issue of nigral cell vulnerability and to evaluate interventions with clinical potential. 6-Hydroxydopamine (6-OHDA) was infused in escalating, intrastriatal doses over several weeks. Control animals received multiple infusions of vehicle at the same volume. Behavioral testing was carried out between each infusion, including forelimb-use and somatosensory function. A symptomatic threshold was established for each animal, indicating the amount of neurotoxin required to induce a stable deficit. Oral administration of L-DOPA (Sinemet) ameliorated limb-use asymmetries acutely. An immunocytochemical assay for tyrosine hydroxylase, a dopamine cell marker, revealed a partial loss of immunoreactive cells in the substantia nigra. Animals that were co-administered methylphenidate (MPH), a dopamine transport inhibitor, along with the 6-OHDA were spared from the behavioral and neurochemical effects of 6-OHDA, despite receiving more than twice as much neurotoxin as controls. These data suggest that establishing a symptomatic threshold preclinically may help researchers evaluate potential treatments and model individual and group resistance to nigrostriatal insults.
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Affiliation(s)
- Sheila M Fleming
- Department of Psychology, Institute for Neuroscience, University of Texas, Austin, TX 78712, USA.
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Karhunen H, Virtanen T, Schallert T, Sivenius J, Jolkkonen J. Forelimb use after focal cerebral ischemia in rats treated with an alpha 2-adrenoceptor antagonist. Pharmacol Biochem Behav 2003; 74:663-9. [PMID: 12543233 DOI: 10.1016/s0091-3057(02)01053-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Atipamezole, a selective alpha(2)-adrenoceptor antagonist, enhances recovery of sensorimotor function after focal cerebral ischemia in rats. The aim of the present study was to further characterize the effects of atipamezole treatment combined with enriched-environment housing in ischemic rats by evaluating spontaneous exploratory activity in the cylinder test. The right middle cerebral artery (MCA) of rats was occluded for 120 min using the intraluminal filament method. Atipamezole (1.0 mg/kg) or 0.9% NaCl was administered on postoperative days 2 through 11 and 15, 19, and 23. Spontaneous behavior of rats in a transparent cylinder was videotaped before, and 6 and 23 days after surgery 20 min after drug administration. Constant asymmetry in forelimb use was observed in the cylinder test on postoperative days 6 and 23. Ischemic rats used the impaired forelimbs (contralateral to lesion) during lateral exploration less than did sham-operated rats (P<.001). Ischemic rats also preferred to turn contralateral to the lesion (P<.05). Atipamezole increased the simultaneous, but not independent, use of the forelimbs during lateral exploration (P<.05). The data suggest that noradrenergic manipulation does not significantly enhance recovery in a test that does not depend on practice following focal cerebral ischemia.
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Affiliation(s)
- Heli Karhunen
- Department of Neuroscience and Neurology, University of Kuopio, PO Box 1627, Harjulante 1, 70211, Kuopio, Finland
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Whishaw IQ, Metz GA. Absence of impairments or recovery mediated by the uncrossed pyramidal tract in the rat versus enduring deficits produced by the crossed pyramidal tract. Behav Brain Res 2002; 134:323-36. [PMID: 12191820 DOI: 10.1016/s0166-4328(02)00051-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The pyramidal tract of the rat consists of at least two components. A majority of the fibers cross in the lower medulla and descend through the spinal cord in the ventral portion of the dorsal funiculus. The remaining 5% of the corticospinal projection does not cross and descends in the ipsilateral ventral funiculus into the cervical spinal region where its projections terminate in the internuncial portions of the spinal gray matter. The anatomical origin and terminal distribution of the ipsilateral component suggests that it may be involved in the control of the ipsilateral limb, but the possible contribution of the ipsilateral corticospinal tract has not been systematically examined. To determine whether the ipsilateral corticospinal tract makes a contribution to skilled movement, the corticospinal tract was severed unilaterally at the medullary level rostral to the decussation, thus severing both the crossed component of the tract as well as the ipsilateral component. Performance of the ipsilateral and the contralateral limbs of rats were then evaluated on tests of limb posture, preference, placing, and use in two skilled reaching tasks. No impairments on any quantitative or qualitative measure of performance were detected in the use of the limb ipsilateral to the lesion but severe, enduring impairments on all qualitative and quantitative measures were obtained in use of the limb contralateral to the lesion. Thus, the study finds: (1) no evidence that the ipsilateral portion of the corticospinal tract makes a contribution to skilled movement of the kind made by the contralateral portion of the corticospinal tract, and (2) no evidence that the remaining uncrossed portion of the tract contributes to recovery of symptoms produced by severing the crossed portion of the tract.
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Affiliation(s)
- Ian Q Whishaw
- Canadian Centre for Behavioural Neuroscience, The University of Lethbridge, 4401 University Drive, Lethbridge, Alberta, Canada T1K 3M4.
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