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  • Title: Current and experimental treatments of Parkinson disease: A guide for neuroscientists.
    Author: Oertel W, Schulz JB.
    Journal: J Neurochem; 2016 Oct; 139 Suppl 1():325-337. PubMed ID: 27577098.
    Abstract:
    Over a period of more than 50 years, the symptomatic treatment of the motor symptoms of Parkinson disease (PD) has been optimized using pharmacotherapy, deep brain stimulation, and physiotherapy. The arsenal of pharmacotherapies includes L-Dopa, several dopamine agonists, inhibitors of monoamine oxidase (MAO)-B and catechol-o-methyltransferase (COMT), and amantadine. In the later course of the disease, motor complications occur, at which stage different oral formulations of L-Dopa or dopamine agonists with long half-life, a transdermal application or parenteral pumps for continuous drug supply can be subscribed. Alternatively, the patient is offered deep brain stimulation of the subthalamic nucleus (STN) or the internal part of the globus pallidus (GPi). For a more efficacious treatment of motor complications, new formulations of L-Dopa, dopamine agonists, and amantadine as well as new MAO-B and COMT inhibitors are currently tested in clinical trials, and some of them already yielding positive results in phase 3 trials. In addition, non-dopaminergic agents have been tested in the early clinical phase for the treatment of motor fluctuations and dyskinesia, including adenosine A2A antagonists (istradefylline, preladenant, and tozadenant) and modulators of the metabolic glutamate receptor 5 (mGluR5 - mavoglurant) and serotonin (eltoprazine) receptors. Recent clinical trials testing coenzyme Q10, the dopamine agonist pramipexole, creatine monohydrate, pioglitazone, or AAV-mediated gene therapy aimed at increasing expression of neurturin, did not prove efficacious. Treatment with nicotine, caffeine, inosine (a precursor of urate), and isradipine (a dihydropyridine calcium channel blocker), as well as active and passive immunization against α-synuclein and inhibitors or modulators of α-synuclein-aggregation are currently studied in clinical trials. However, to date, no disease-modifying treatment is available. We here review the current status of treatment options for motor and non-motor symptoms, and discuss current investigative strategies for disease modification. This review provides basic insights, mainly addressing basic scientists and non-specialists. It stresses the need to intensify therapeutic PD research and points out reasons why the translation of basic research to disease-modifying therapies has been unsuccessful so far. The symptomatic treatment of the motor symptoms of Parkinson disease (PD) has been constantly optimized using pharmacotherapy (L-Dopa, several dopamine agonists, inhibitors of monoamine oxidase (MAO)-B and catechol-o-methyltransferase (COMT), and amantadine), deep brain stimulation, and physiotherapy. For a more efficacious treatment of motor complications, new formulations of L-Dopa, dopamine agonists, and amantadine as well as new MAO-B and COMT inhibitors are currently tested in clinical trials. Non-dopaminergic agents have been tested in the early clinical phase for the treatment of motor fluctuations and dyskinesia. Recent clinical trials testing coenzyme Q10, the dopamine agonist pramipexole, creatine monohydrate, pioglitazone, or AAV-mediated gene therapy aimed at increasing expression of neurturin, did not prove efficacious. Treatment with nicotine, caffeine, and isradipine - a dihydropyridine calcium channel blocker - as well as active and passive immunization against α-synuclein and inhibitors of α-synuclein-aggregation are currently studied in clinical trials. However, to date, no disease-modifying treatment is available for PD. We here review the current status of treatment options and investigative strategies for both motor and non-motor symptoms. This review stresses the need to intensify therapeutic PD research and points out reasons why the translation of basic research to disease-modifying therapies has been unsuccessful so far. This article is part of a special issue on Parkinson disease.
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