Erythromycin estolate vs. erythromycin base, surface excess properties and surface scanning changes in isolated liver...

Area of Science:

• Hepatology
• Toxicology
• Pharmacology

Background:

• Erythromycin is a widely used antibiotic.
• The estolate form of erythromycin has been associated with potential liver injury.

Purpose of the Study:

• To compare the in vitro hepatotoxicity of erythromycin estolate and erythromycin base.
• To investigate the cellular mechanisms underlying erythromycin-induced liver injury.

Main Methods:

• Primary rat hepatocytes and Chang liver cells were exposed to varying concentrations of erythromycin estolate or base for 1-5 hours.
• Hepatotoxicity was assessed by measuring intracellular enzyme leakage into the medium.
• Cellular damage was visualized using surface scanning electron microscopy.

Main Results:

• Erythromycin estolate exposure led to significantly increased enzyme leakage compared to controls.
• Cells treated with erythromycin estolate exhibited severe cytopathic changes under scanning electron microscopy.
• Erythromycin base did not cause significant hepatotoxicity under the tested conditions.

Conclusions:

• Erythromycin estolate demonstrates significant in vitro hepatotoxicity in both Chang liver cells and isolated rat hepatocytes.
• The estolate form, not the base form, is responsible for the observed liver cell damage.
• These findings suggest a specific mechanism of injury associated with erythromycin estolate.