Related Experiment Videos
Erythromycin estolate impairs the mitochondrial and microsomal calcium homeostasis: correlation with hepatotoxicity
Abstract:
The effects of erythromycin estolate, a well known hepatotoxic macrolide antibiotic, on isolated rat hepatocyte viability and on subcellular Ca2+ transport have been investigated. Erythromycin estolate (0.5 mM), but not erythromycin base and erythromycin ethylsuccinate, induced 100% cell death after 60 min incubation, and caused maximal inhibition of mitochondrial and microsomal Ca2+ sequestration activities at 0.1 mM concentration. Sodium lauryl sulphate, which is the surfactant moiety of the erythromycin estolate molecule, caused effects similar to those exhibited by erythromycin estolate. Disorders of the intracellular calcium homeostasis seem to play a role in the lauryl sulphate-mediated hepatotoxic action of erythromycin estolate.
Insights
Erythromycin estolate causes significant liver cell death and impairs calcium transport in rats, unlike other forms. This hepatotoxicity is linked to its surfactant component, sodium lauryl sulfate, and disrupted calcium homeostasis.
Area of Science:
- Pharmacology
- Hepatology
- Cell Biology
Background:
- Erythromycin estolate is a macrolide antibiotic known for its hepatotoxic potential.
- Understanding the mechanisms of drug-induced liver injury is crucial for patient safety.
Purpose of the Study:
- To investigate the effects of erythromycin estolate on isolated rat hepatocyte viability.
- To examine the impact of erythromycin estolate on subcellular calcium (Ca2+) transport.
Main Methods:
- Isolated rat hepatocytes were incubated with erythromycin estolate, erythromycin base, and erythromycin ethylsuccinate.
- Mitochondrial and microsomal Ca2+ sequestration activities were measured.
- The effects of sodium lauryl sulfate were also assessed.
Main Results:
- Erythromycin estolate (0.5 mM) induced 100% cell death within 60 minutes.
- Maximal inhibition of mitochondrial and microsomal Ca2+ sequestration occurred at 0.1 mM erythromycin estolate.
- Sodium lauryl sulfate mimicked the hepatotoxic effects of erythromycin estolate.
Conclusions:
- Erythromycin estolate exhibits significant hepatotoxicity in isolated rat hepatocytes.
- Disruption of intracellular calcium homeostasis appears to mediate the hepatotoxic effects of erythromycin estolate, particularly its surfactant component.