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Antizyme affects cell proliferation and viability solely through regulating cellular polyamines.
Zippi Bercovich1, Zohar Snapir, Alona Keren-Paz
1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot 76199, Israel.
The Journal of Biological Chemistry
|August 12, 2011
Summary
Antizymes (Az) regulate cell proliferation by controlling polyamine metabolism. This study shows antizymes affect cell proliferation and viability exclusively through polyamine metabolism, not by degrading other proteins.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Antizymes (Az) are crucial regulators of cellular polyamine metabolism.
- They negatively regulate cell proliferation and are considered tumor suppressors.
- Recent studies suggested Az might affect cell proliferation by degrading non-metabolic proteins.
Purpose of the Study:
- To investigate whether antizymes regulate cell proliferation solely through polyamine metabolism.
- To determine if antizymes target non-metabolic proteins for degradation.
Main Methods:
- Co-degradation assays were used to assess protein degradation.
- Stable expression of antizymes was achieved in cells expressing trypanosome ornithine decarboxylase (ODC).
Main Results:
- Az1 and Az2 efficiently stimulated ornithine decarboxylase (ODC) degradation.
- Az1 and Az2 showed negligible effects on the degradation of cyclin D1, Aurora-A, and a p73 variant.
- Antizymes could be stably expressed in cells with trypanosome ODC, which maintains constant polyamine levels.
Conclusions:
- Antizymes (Az1 and Az2) impact cell proliferation and viability exclusively by modulating cellular polyamine metabolism.
- The antiproliferative function of antizymes is directly linked to their role in polyamine homeostasis.
- Evidence does not support antizymes regulating proliferation via degradation of non-polyamine metabolic proteins.
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