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Attenuation of daunorubicin-augmented microsomal lipid peroxidation and oxygen consumption by calcium channel
1College of Pharmacy, South Dakota State University, Brookings 57007.
Abstract:
Daunorubicin (20 microM) stimulated NADPH-dependent microsomal lipid peroxidation about 2-fold over control values and enhanced the rate of oxygen utilization by microsomes. The calcium channel blockers tested inhibited daunorubicin-augmented lipid peroxidation and O2 consumption to varying degrees. Inhibition of daunorubicin-stimulated lipid peroxidation was found to be dose dependent; the IC50 (drug concentration producing 50% inhibition of lipid peroxidation) values for verapamil, nifedipine and diltiazem were approximately 150 microM, 200 microM, and 600 microM respectively. Our in vitro studies suggest that calcium channel antagonists may modulate the free radical-mediated, cardiotoxic effects of daunorubicin.
Insights
Calcium channel blockers may reduce the cardiotoxic effects of the chemotherapy drug daunorubicin. These blockers inhibited lipid peroxidation and oxygen consumption stimulated by daunorubicin in vitro.
Area of Science:
- Biochemistry
- Pharmacology
- Cardiology
Background:
- Daunorubicin is a chemotherapy agent with known cardiotoxic side effects.
- Cardiotoxicity is often linked to free radical-mediated damage, including lipid peroxidation.
- Microsomal lipid peroxidation and oxygen consumption are indicators of cellular oxidative stress.
Purpose of the Study:
- To investigate the effect of calcium channel blockers on daunorubicin-induced microsomal lipid peroxidation and oxygen consumption.
- To determine if calcium channel antagonists can modulate the free radical-mediated cardiotoxic effects of daunorubicin.
Main Methods:
- In vitro study using rat liver microsomes.
- Stimulation of lipid peroxidation and oxygen utilization using daunorubicin (20 microM).
- Assessment of inhibition by various calcium channel blockers (verapamil, nifedipine, diltiazem) in a dose-dependent manner.
Main Results:
- Daunorubicin significantly increased NADPH-dependent microsomal lipid peroxidation and oxygen utilization.
- Tested calcium channel blockers inhibited daunorubicin-augmented lipid peroxidation and O2 consumption to varying degrees.
- Dose-dependent inhibition was observed, with IC50 values for verapamil, nifedipine, and diltiazem at approximately 150 microM, 200 microM, and 600 microM, respectively.
Conclusions:
- Calcium channel antagonists show potential in modulating daunorubicin-induced oxidative stress.
- These findings suggest a possible therapeutic strategy to mitigate daunorubicin cardiotoxicity.
- Further in vivo studies are warranted to confirm these in vitro observations.