Colchicine-induced Mallory body formation in the mouse

Area of Science:

• Hepatology
• Cell Biology
• Toxicology

Background:

• Mallory bodies (MB) are protein aggregates found in liver cells, often associated with liver injury.
• The precise mechanisms of MB formation and their relationship to cellular structures are not fully understood.

Purpose of the Study:

• To investigate the long-term effects of griseofulvin on liver cells and MB formation.
• To explore the cellular mechanisms underlying MB development and their potential link to intermediate filaments.

Main Methods:

• Mice were subjected to long-term griseofulvin treatment.
• Subsequent griseofulvin challenges were administered after a drug-free period.
• The effects of colchicine and cytochalasin B on MB formation were assessed.

Main Results:

• Prolonged griseofulvin exposure led to the development of MB in mouse liver cells.
• Hepatocytes demonstrated an immediate response to griseofulvin challenge with MB formation, even after a month without the drug, indicating a 'primed' state.
• Colchicine, unlike cytochalasin B, also induced MB under specific experimental conditions.

Conclusions:

• Griseofulvin treatment can 'prime' liver cells for rapid MB formation.
• The induction of MB by colchicine, an antitubulin agent, supports the hypothesis that MB are related to intermediate filaments.