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c-Myc antisense limits rat liver regeneration and indicates role for c-Myc in regulating cytochrome P-450 3A activity

V Arora1, D C Knapp, B L Smith

  • 1AVI BioPharma, Corvallis, Oregon, USA.

The Journal of Pharmacology and Experimental Therapeutics
|February 25, 2000
PubMed

Insights

Antisense oligomers targeting c-myc protein effectively reduced cell proliferation in regenerating rat livers. This inhibition also affected cell cycle progression and cytochrome P-450 activity, demonstrating c-myc

Area of Science:

  • Molecular Biology
  • Hepatology
  • Pharmacology

Background:

  • c-myc protein expression is crucial for cell proliferation.
  • Liver regeneration after partial hepatectomy (PH) involves rapid cell division.
  • Antisense technology offers a method to specifically inhibit gene expression.

Purpose of the Study:

  • To investigate the effect of inhibiting c-myc expression on liver regeneration.
  • To evaluate the efficacy of a novel antisense phosphorodiamidate morpholino oligomer (PMO) against c-myc.
  • To assess the impact of c-myc inhibition on cell cycle progression and liver function.

Main Methods:

  • Administration of a c-myc-specific PMO (AVI-4126) in rats post-partial hepatectomy.
  • Quantification of c-myc protein levels, proliferating cell nuclear antigen (PCNA), and cell cycle distribution.
  • Analysis of cell cycle checkpoint proteins (p53, p21waf-1) and cytochrome P-450 3A2 (CYP3A2) activity.

Main Results:

  • AVI-4126 significantly reduced c-myc protein expression in a dose-dependent manner.
  • Inhibition of c-myc led to decreased PCNA and cell cycle arrest in the G(0)/G(1) phase.
  • AVI-4126 treatment altered the G(2):G(0) cell population ratio and dose-dependently decreased CYP3A2 activity in regenerating livers.

Conclusions:

  • Antisense inhibition of c-myc effectively reduces cell proliferation in regenerating rat liver.
  • c-myc downregulation impacts cell cycle progression and may indirectly affect CYP3A expression.
  • AVI-4126 demonstrates potential as a therapeutic agent for controlling liver cell proliferation.

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