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Levodopa intake increases plasma levels of S-adenosylmethionine in treated patients with Parkinson disease

Müller, Thomas and Fowler, Brian and Kuhn, Wilfried. (2004) Levodopa intake increases plasma levels of S-adenosylmethionine in treated patients with Parkinson disease. Clinical neuropharmacology, Vol. 28, H. 6. pp. 274-276.

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Official URL: http://edoc.unibas.ch/dok/A5253377

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Abstract

Metabolism of levodopa via the enzyme catechol-O-methyltransferase requires S-adenosylmethionine (SAM) as a methyl donor. SAM caused Parkinson disease (PD)-like symptoms in rodents. Therefore, SAM could contribute to a decreased efficacy of levodopa in the long term. SAM levels were significantly reduced in levodopa-treated PD patients, but they showed increased enzyme methionine adenosyl transferase (MAT) activity, which induces SAM synthesis from methionine (MET). This may result from a rebound increase of SAM production. The objective of the study was to demonstrate an effect of acute levodopa intake on SAM synthesis in the plasma of treated PD patients. The authors measured SAM, MET, and levodopa plasma concentrations in 13 levodopa-treated PD patients before and after application of 125 mg levodopa/benserazide. Plasma levels of SAM and levodopa significantly increased, but MET concentrations did not significantly decrease. The SAM increase after levodopa intake may exert both a certain antidepressant and cognitive function improving effect. This is often observed in untreated PD patients who receive levodopa for the first time, or in more advanced, fluctuating PD patients, when they turn from the OFF to the ON phase. Because SAM in higher dosages may also counteract the antiparkinsonian efficacy of levodopa according to animal trials, this SAM increase may hypothetically contribute to the onset of wearing-off phenomena and other clinical signs of limited efficacy of levodopa during long-term treatment with levodopa in PD patients.
Faculties and Departments:03 Faculty of Medicine > Bereich Kinder- und Jugendheilkunde (Klinik) > Ehemalige Einheiten Pädiatrie (UKBB) > Labor (Fowler)
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Kinder- und Jugendheilkunde (Klinik) > Ehemalige Einheiten Pädiatrie (UKBB) > Labor (Fowler)
UniBasel Contributors:Fowler, Brian
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Lippincott Williams & Wilkins
ISSN:0362-5664
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:24
Deposited On:22 Mar 2012 13:38

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