PMID: 8458598Jan 1, 1993Paper

Renal dopamine excretion in healthy volunteers after oral ingestion of L-dopa

Fundamental & Clinical Pharmacology
M BarthelmebsJ L Imbs

Abstract

L-Dopa is converted to dopamine by aromatic-L-amino acid decarboxylase (AADC). In the kidney, proximal tubular epithelial cells are rich in AADC and urinary free dopamine excretion is a marker for endorenal extraneuronal dopamine synthesis. The urinary free dopamine excretion was analysed in a double-blind cross-over study after oral ingestion of L-Dopa or a placebo in five healthy volunteers. The drug ingestions were separated by one week's wash-out. Since in a preliminary study, two volunteers ingesting a single L-Dopa dose of 500 mg with breakfast experienced nausea, the five volunteers of the present study were given 300 mg L-Dopa (50 mg at 9 am with breakfast, 100 mg before lunch and 150 mg before dinner) without any adverse effects. L-Dopa induced an increase in 24-h urinary dopamine excretion (HPLC with electrochemical detection). Free urinary dopamine (1900 micrograms/24 h) accounted for 0.8% of the daily oral L-Dopa dose and represented 10% of total urinary dopamine excretion. L-Dopa treatment had no significant effect on mean ambulatory arterial blood pressure and heart rate measured from 9 am to 6 pm (Spacelabs) or on 24 h urinary water and sodium excretion.

References

Jun 1, 1990·American Journal of Hypertension·R M CareyR L Chevalier
Jun 1, 1990·American Journal of Hypertension·M BarthelmebsJ L Imbs
Sep 1, 1985·Japanese Circulation Journal·S YonedaH Takahashi
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Citations

Jan 23, 2013·Endocrine Practice : Official Journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists·Adam Jacobs
Jun 6, 2013·Endocrine Practice : Official Journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists
Jul 15, 2000·Journal of Inherited Metabolic Disease·N G AbelingA H van Gennip

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