A novel insight into the cardiotoxicity of antineoplastic drug doxorubicin

Area of Science:

• Biochemistry
• Cardiology
• Pharmacology

Background:

• Doxorubicin is a vital antineoplastic agent for various cancers.
• Doxorubicin-induced cardiotoxicity, including dilated cardiomyopathy and heart failure, is a significant clinical concern.
• The molecular mechanisms underlying doxorubicin's cardiac side effects, particularly its interactions with cardiac biomolecules, remain poorly understood.

Purpose of the Study:

• To investigate the impact of doxorubicin exposure on the concentrations of major amino acids within cardiac muscle tissue.
• To identify specific amino acids most affected by doxorubicin interaction in the myocardium.
• To explore the potential role of doxorubicin-amino acid interactions in cardiotoxicity.

Main Methods:

• An in vitro study was conducted to compare amino acid profiles in heart tissue before and after doxorubicin application.
• Analysis included major amino acids such as proline, taurine, glutamic acid, arginine, aspartic acid, leucine, glycine, valine, alanine, isoleucine, threonine, lysine, and serine.
• Interaction studies determined the sensitivity of each amino acid to doxorubicin.

Main Results:

• Doxorubicin directly influences myocardial amino acid composition, even at low concentrations.
• Lysine, arginine, β-alanine, valine, and serine were identified as the most sensitive amino acids to doxorubicin.
• A significant reduction (p = 0.05) in the overall amount of amino acids was observed after doxorubicin interaction in myocardial tissue.

Conclusions:

• Doxorubicin significantly alters the quantitative composition of amino acids in the myocardium.
• The observed changes in amino acid profiles suggest a direct interaction between doxorubicin and myocardial amino acids.
• These interactions represent a potential contributing factor to the adverse cardiac effects associated with doxorubicin chemotherapy.