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Related Experiment Videos

RNA interference of VCP/p97 increases Mallory body formation.

Li Nan1, Yong Wu, Fawzia Bardag-Gorce

  • 1Department of Pathology, Harbor-UCLA Medical Center, Torrance, CA 90505, USA.

Experimental and Molecular Pathology
|December 15, 2004
PubMed
Summary

Valosin-containing protein (VCP) is crucial for Mallory body (MB) formation in hepatocytes. Inhibiting VCP expression significantly increases MBs and disrupts the ubiquitin-proteasome system (UPS), highlighting VCP's role in liver cell health.

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Area of Science:

  • Hepatology
  • Cell Biology
  • Biochemistry

Background:

  • Mallory bodies (MBs) are protein aggregates found in liver cells, implicated in various liver diseases.
  • The role of valosin-containing protein (VCP) in MB formation has not been fully elucidated.
  • The ubiquitin-proteasome system (UPS) is critical for protein degradation and cellular homeostasis.

Purpose of the Study:

  • To investigate the role of valosin-containing protein (VCP) in the formation of Mallory bodies (MBs).
  • To examine the impact of VCP modulation on MB formation and the ubiquitin-proteasome system (UPS) in hepatocytes.

Main Methods:

  • Primary hepatocytes from drug-primed and normal mice were cultured.
  • VCP expression was inhibited using gene-specific FITC-labeled gripNA (gVCP).

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  • VCP was overexpressed using a plasmid encoding GFP-fused VCP (pVCP-GFP).
  • MB formation, ubiquitin (Ub) and cytokeratin (CK) aggregates, and proteasome chymotrypsin-like (ChT-L) activity were assessed.

    • Main Results:

    • Inhibition of VCP expression significantly increased MB formation in drug-primed hepatocytes by 230%.
    • Blocking VCP induced Ub and CK aggregates in normal hepatocytes and decreased proteasome ChT-L activity in both cell types.
    • Overexpression of VCP led to its accumulation within MBs but did not decrease MB formation.

    Conclusions:

    • Valosin-containing protein (VCP) plays a significant role in inducing MB formation.
    • VCP likely exerts its function through its molecular chaperone activity within the ubiquitin-proteasome system (UPS).
    • VCP modulation impacts protein aggregate formation and proteasome function in hepatocytes.