title: Neural substrates and potential treatments for levodopa-induced dyskinesias in Parkinson's disease.
abstract: Parkinson's disease (PD) is primarily a motor disorder that involves the gradual loss of motor function. Symptoms are observed initially in the extremities, such as hands and arms, while advanced stages of the disease can effect blinking, swallowing, speaking, and breathing. PD is a neurodegenerative disease, with dopaminergic neuronal loss occurring in the substantia nigra pars compacta, thus disrupting basal ganglia functions. This leads to downstream effects on other neurotransmitter systems such as glutamate, γ-aminobutyric acid, and serotonin. To date, one of the main treatments for PD is levodopa. While it is generally very effective, prolonged treatments lead to levodopa-induced dyskinesia (LID). LID encompasses a family of symptoms ranging from uncontrolled repetitive movements to sustained muscle contractions. In many cases, the symptoms of LID can cause more grief than PD itself. The purpose of this review is to discuss the possible clinical features, cognitive correlates, neural substrates, as well as potential psychopharmacological and surgical (including nondopaminergic and deep brain stimulation) treatments of LID.
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Phillips
authors.forename: Abeer M
authors.initials: AM
authors.lastname: Eissa
authors.forename: Doaa H
authors.initials: DH
authors.lastname: Hewedi
authors.forename: Marjan
authors.initials: M
authors.lastname: Jahanshahi
authors.forename: Mohamed
authors.initials: M
authors.lastname: El-Gamal
authors.forename: Szabolcs
authors.initials: S
authors.lastname: Keri
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Moustafa
mesh_terms: D000818:Animals; D000978:Antiparkinson Agents / Q000627:therapeutic use*; D046690:Deep Brain Stimulation / Q000379:methods; D004298:Dopamine / Q000378:metabolism; D006801:Humans; D007980:Levodopa / Q000627:therapeutic use*; D010300:Parkinson Disease / Q000188:drug therapy* / Q000503:physiopathology*; D012701:Serotonin / Q000378:metabolism
chemical_list: D000978:Antiparkinson Agents; D012701:Serotonin; D007980:Levodopa; D004298:Dopamine