Prolonged morphine administration alters protein expression in the rat myocardium
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Published on: August 16, 2019
Zdenka Drastichova1, Jitka Skrabalova, Jan Neckar
1Department of Physiology, Charles University, Prague.
Background:
Morphine is used in clinical practice as a highly effective painkiller as well as the drug of choice for treatment of certain heart diseases. However, there is lack of information about its effect on protein expression in the heart. Therefore, here we aimed to identify the presumed alterations in rat myocardial protein levels after prolonged morphine treatment.
Methods:
Morphine was administered to adult male Wistar rats in high doses (10 mg/kg per day) for 10 days. Proteins from the plasma membrane- and mitochondria-enriched fractions or cytosolic proteins isolated from left ventricles were run on 2D gel electrophoresis, scanned and quantified with specific software to reveal differentially expressed proteins.
Results:
Nine proteins were found to show markedly altered expression levels in samples from morphine-treaded rats and these proteins were identified by mass spectrometric analysis. They belong to different cell pathways including signaling, cytoprotective, and structural elements.
Conclusions:
The present identification of several important myocardial proteins altered by prolonged morphine treatment points to global effects of this drug on heart tissue. These findings represent an initial step toward a more complex view on the action of morphine on the heart.
Insights
Prolonged high-dose morphine treatment alters multiple protein levels in rat heart tissue, affecting signaling, structural, and cytoprotective pathways. This study reveals global effects of morphine on cardiac proteins.
Area of Science:
- Cardiology
- Pharmacology
- Proteomics
Background:
- Morphine is a widely used analgesic and cardiac medication.
- Its effects on myocardial protein expression remain largely uncharacterized.
Purpose of the Study:
- To investigate alterations in rat myocardial protein levels following prolonged morphine administration.
- To identify specific proteins affected by high-dose morphine treatment in the heart.
Main Methods:
- Adult male Wistar rats received high-dose morphine (10 mg/kg/day) for 10 days.
- Proteins from left ventricular fractions (plasma membrane, mitochondria, cytosol) were analyzed using 2D gel electrophoresis.
- Differential protein expression was quantified and identified via mass spectrometry.
Main Results:
- Nine proteins exhibited significantly altered expression in morphine-treated rats.
- Identified proteins are involved in critical cellular pathways, including signaling, cytoprotection, and structural functions.
- Mass spectrometry confirmed the identity of these differentially expressed proteins.
Conclusions:
- Prolonged morphine treatment induces global changes in myocardial protein expression.
- These findings provide initial insights into morphine's complex actions on heart tissue.
- Further research is warranted to fully understand the cardiac implications of morphine therapy.
