Basic Clin Pharmacol Toxicol
Department of Pharmacology and Toxicology, University of Kuopio, Kuopio, Finland.
Published: March 2008
A unilateral 6-hydroxydopamine (6-OHDA)-lesioned rat model of Parkinson's disease was used to determine an effective dose to abolish circling behaviour of the continuous intrastriatal infusions of L-dopa via osmotic minipumps into the lesioned striatum. This 2-week L-dopa treatment evoked a dose-dependent decrease in the contralateral rotations induced by acute intraperitoneal L-dopa and carbidopa that was sustained at least for 10 weeks. The minimum effective dose of intrastriatal L-dopa was 3 microg/hr. Striatal [3H]-spiperone binding was significantly increased by the 6-OHDA lesion, reflecting a permanent, lesion-induced, up-regulation of dopamine D2 receptors. Furthermore, striatal dopamine and its metabolites as well as the level of tyrosine hydroxylase were significantly reduced by 6-OHDA. None of these parameters were restored by the 2-week L-dopa infusions but, unexpectedly, the rotational response did not become normalized after discontinuation of L-dopa infusions. Nigral 6-OHDA lesions suppressed ipsilateral striatal 5-hydroxytryptamine (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) concentrations, and 5-HT uptake sites while tryptophan hydroxylase was not changed in the striatum. When studying the cause of the sustained circling behaviour, we found that intrastriatal L-dopa infusion dose-dependently elevated striatal tryptophan hydroxylase much above the levels of intact side and 5-HT uptake sites to the level of intact side, but the striatal 5-HT levels exhibited no significant recovery while 5-HIAA levels were partially restored. These data support the view that a long-term ipsilateral activation of the serotonergic innervation occurs after L-dopa infusions into the lesioned striata.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1111/j.1742-7843.2007.00153.x | DOI Listing |
Medicina (Kaunas)
December 2024
Department of Neurology, Faculty of Medical Sciences in Katowice, University Clinical Centre Prof K. Gibinski, Medical University of Silesia, 14 Medykow St. 40-752 Katowice, Poland.
The rapid growth of the number of advanced Parkinson's disease (PD) patients has caused a significant increase in the use of device-aided therapies (DATs), including levodopa-carbidopa intestinal gel (LCIG) and continuous subcutaneous apomorphine infusion (CSAI). The objective of this study was to evaluate patients' satisfaction and the factors influencing preferences for CSAI and LCIG. The research focused on individuals diagnosed with advanced PD undergoing DAT at the Neurology Department of the University Hospital in Katowice.
View Article and Find Full Text PDFCureus
December 2024
College of Medicine, Almaarefa University, Riyadh, SAU.
Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by motor and non-motor symptoms that profoundly impact patients' quality of life. While pharmacological therapies such as levodopa remain the mainstay of treatment, their long-term use is often limited by motor complications. Device-based interventions, including deep brain stimulation (DBS) and continuous dopaminergic infusions, have emerged as alternatives, promising sustained symptomatic control and reduced medication-related side effects.
View Article and Find Full Text PDFMed Lett Drugs Ther
January 2025
Neurol Neurochir Pol
January 2025
Department of Neurology, University Medical Centre Ljubljana, Ljubljana, Slovenia.
Introduction: In the advanced stages of Parkinson's disease (PD), when standard drug adjustments fail to sufficiently improve patients' quality of life, device-aided therapies (DATs) such as deep brain stimulation (DBS), continuous subcutaneous apomorphine infusion (CSAI), levodopa-carbidopa intestinal gel infusion (LCIG), levodopa-carbidopa-entacapone intestinal gel infusion, or continuous subcutaneous foslevodoa-foscarbidopa infusion are beneficial in the long run. However, sometimes patients need to switch or combine DATs due to either adverse events or loss of efficacy.
Aim Of Study: The aim of this article was to summarise the existing data on the long-term efficacy and adverse events of DATs, and to review the data on the rationale and efficacy for switching or combining DATs in advanced PD.
Brain Sci
December 2024
Hospital Infanta Sofía, San Sebastián de los Reyes, 28702 Madrid, Spain.
Background And Objective: Staging Parkinson's disease (PD) with a novel simple classification called MNCD, based on four axes (Motor; Non-motor; Cognition; Dependency) and five stages, correlated with disease severity, patients' quality of life and caregivers' strain and burden. Our aim was to apply the MNCD classification in advanced PD patients treated with device-aided therapy (DAT).
Patients And Methods: A multicenter observational retrospective study of the first patients to start the levodopa-entacapone-carbidopa intestinal gel (LECIG) in Spain was performed (LECIPARK study).
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!
© LitMetric 2025. All rights reserved.