Polyamine dependence of normal cell-cycle progression

Research output: Contribution to journalArticle

Abstract

The driving force of the cell cycle is the activities of cyclin-dependent kinases (CDKs). Key steps in the regulation of the cell cycle therefore must impinge upon the activities of the CDKs. CDKs exert their functions when bound to cyclins that are expressed cyclically during the cell cycle. Polyamine biosynthesis varies bicyclically during the cell cycle with peaks in enzyme activities at the G(1)/S and S/G(2) transitions. The enzyme activities are regulated at transcriptional, translational and post-translational levels. When cells are seeded in the presence of drugs that interfere with polyamine biosynthesis, cell cycle progression is affected within one cell cycle after seeding. The cell cycle phase that is most sensitive to polyamine biosynthesis inhibition is the S phase, while effects on the G(1) and G(2)/M phases occur at later time points. The elongation step of DNA replication is negatively affected when polyamine pools are not allowed to increase normally during cell proliferation. Cyclin A is expressed during the S phase and cyclin A/CDK2 is important for a normal rate of DNA elongation. Cyclin A expression is lowered in cells treated with polyamine biosynthesis inhibitors. Thus, polyamines may affect S phase progression by participating in the regulation of cyclin A expression.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Biochemistry and Molecular Biology

Keywords

  • decarboxylase, ornithine, cyclin, S-adenosylmethionine decarboxylase, cell cycle, polyamine
Original languageEnglish
Pages (from-to)366-370
JournalBiochemical Society Transactions
Volume31
Publication statusPublished - 2003
Publication categoryResearch
Peer-reviewedYes