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Mallory body induction in drug-primed mouse liver
Q X Yuan1, N Marceau, B A French
1Department of Pathology, Harbor-UCLA Medical Center, Torrance, CA, USA.
Hepatology (Baltimore, Md.)
|September 1, 1996
Summary
Mallory body (MB) formation is induced by specific drug refeeding, not liver cell regeneration. Ubiquitination of cytokeratin proteins appears crucial for MB aggregation.
Area of Science:
- Hepatology
- Cell Biology
- Toxicology
Background:
- Mallory bodies (MBs) are intracellular inclusions found in various liver injuries.
- The precise mechanisms and regulatory pathways of MB formation remain incompletely understood.
Purpose of the Study:
- To investigate the factors involved in the induction of Mallory body formation.
- To determine the relationship between MB formation and liver cell regeneration.
Main Methods:
- A mouse model was established using griseofulvin or DDC refeeding to induce MB formation.
- Western blotting was employed to analyze protein expression, including cytokeratins, actin, and ubiquitin conjugates.
- Proliferating cell nuclear antigen (PCNA) was used to assess liver cell regeneration.
Main Results:
- MBs appeared by day 3 and reached maximum concentration by day 5 of drug refeeding.
- Cytokeratin and actin protein levels increased progressively during drug refeeding.
- No correlation was found between MB frequency and PCNA-positive nuclei, indicating MB formation is independent of liver cell regeneration.
- MBs showed heavy ubiquitination, suggesting a role for ubiquitin-protein conjugates in their aggregation.
Conclusions:
- Mallory body formation is regulated by a pathway distinct from liver cell regeneration.
- Ubiquitination of cytokeratin proteins is implicated in the aggregation process leading to MB formation.