Logo Medical Science Monitor

Call: +1.631.470.9640
Mon - Fri 10:00 am - 02:00 pm EST

Contact Us

Logo Medical Science Monitor Logo Medical Science Monitor Logo Medical Science Monitor

05 May 2005 : Original article  

In vivo and in vitro L-DOPA and reticuline exposure increases ganglionic morphine levels.

Wei Zhu, Kirk J. Mantione, Lihua Shen, George B. Stefano

Med Sci Monit 2005; 11(5): MS1-5 :: ID: 16151

Abstract

BACKGROUND: Given the presence of morphine, its metabolites and precursors, i.e., reticuline, in mammalian and invertebrate tissues, it has become imperative to determine if exposing tissues to putative opiate alkaloid and dopamine precursors would result in increasing endogenous morphine levels. MATERIAL/METHODS: Endogenous morphine levels were determined by high performance liquid chromatography coupled to electrochemical detection and radioimmunoassay, following incubation of Mytilus edulis pedal ganglia with reticuline or L-DOPA. Injection of L-DOPA or reticuline into healthy animals was via the foot. RESULTS: Ganglia incubated in vitro with reticuline or L-DOPA for 1 hour exhibited a concentration and time dependent statistically significant increase in their endogenous morphine levels (5.0 +/- 0.47, 3.6 +/- 0.45 ng/ganglion, respectively). Injection of intact, healthy animals with reticuline or L-DOPA also results in significantly higher endogenous ganglionic morphine levels. CONCLUSIONS: Taken together, we show that L-DOPA is being converted to morphine, demonstrating that pedal ganglia can synthesize morphine from these putative precursors in vitro and in vivo. This is the first demonstration of morphine being synthesized in a normal, healthy free living animal.

Keywords: Benzylisoquinolines - pharmacology, Bivalvia - drug effects, Bivalvia - metabolism, Ganglia - drug effects, Ganglia - metabolism, Levodopa - pharmacokinetics, Alkaloids - pharmacology, Benzylisoquinolines - pharmacology, Bivalvia - metabolism, Ganglia - metabolism, Levodopa - pharmacology, Morphine - metabolism

Add Comment 0 Comments

Editorial

01 June 2024 : Editorial  

Editorial: Concerns as Highly Pathogenic Avian Influenza (HPAI) Virus of the H5N1 Subtype is Identified in Dairy Cows and Other Mammals

Dinah V. Parums

DOI: 10.12659/MSM.945315

Med Sci Monit 2024; 30:e945315

0:00

In Press

Clinical Research  

Comparative Evaluation of Digital Cephalometric Tracing Applications on Mobile Devices and Manual Tracing

Med Sci Monit In Press; DOI: 10.12659/MSM.944628  

0:00

Clinical Research  

Impact of COVID-19-Induced Academic Stress on Insomnia and Suicidal Ideation among Taiwanese Health Trainee...

Med Sci Monit In Press; DOI: 10.12659/MSM.944932  

Review article  

Impact of Workplace Bullying on Nursing Care Quality: A Comprehensive Review

Med Sci Monit In Press; DOI: 10.12659/MSM.944815  

Clinical Research  

Anterior Plate-Supported Cannulated Screw Surgery for Ankle Arthrodesis: Clinical and Radiologic Results in...

Med Sci Monit In Press; DOI: 10.12659/MSM.944452  

Most Viewed Current Articles

17 Jan 2024 : Review article   1,882,405

Vaccination Guidelines for Pregnant Women: Addressing COVID-19 and the Omicron Variant

DOI :10.12659/MSM.942799

Med Sci Monit 2024; 30:e942799

0:00

14 Dec 2022 : Clinical Research   1,538,203

Prevalence and Variability of Allergen-Specific Immunoglobulin E in Patients with Elevated Tryptase Levels

DOI :10.12659/MSM.937990

Med Sci Monit 2022; 28:e937990

0:00

16 May 2023 : Clinical Research   690,402

Electrophysiological Testing for an Auditory Processing Disorder and Reading Performance in 54 School Stude...

DOI :10.12659/MSM.940387

Med Sci Monit 2023; 29:e940387

0:00

01 Jan 2022 : Editorial   50,329

Editorial: Current Status of Oral Antiviral Drug Treatments for SARS-CoV-2 Infection in Non-Hospitalized Pa...

DOI :10.12659/MSM.935952

Med Sci Monit 2022; 28:e935952

0:00

Your Privacy

We use cookies to ensure the functionality of our website, to personalize content and advertising, to provide social media features, and to analyze our traffic. If you allow us to do so, we also inform our social media, advertising and analysis partners about your use of our website, You can decise for yourself which categories you you want to deny or allow. Please note that based on your settings not all functionalities of the site are available. View our privacy policy.

Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750