Importance of polyamines in cell cycle kinetics as studied in a transgenic system
| Autor: | Lo Persson, Sima Nasizadeh, Kersti Alm, Lena Thiman, Stina Oredsson, Louise Myhre |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
G2 Phase
Time Factors Cell Cycle Proteins CHO Cells Biology Ornithine Decarboxylase Transfection S Phase Ornithine decarboxylase chemistry.chemical_compound Cricetinae Polyamines Putrescine Animals Transgenes Cell Proliferation Cell growth Cell Cycle G1 Phase DNA Cell Biology Cell cycle Kinetics Biochemistry chemistry Cell culture Cell Cycle Kinetics Polyamine Cell Division |
| Zdroj: | Experimental Cell Research. 308:254-264 |
| ISSN: | 0014-4827 |
| DOI: | 10.1016/j.yexcr.2005.04.027 |
| Popis: | Polyamines are organic cations, which are considered essential for normal cell cycle progression. This view is based on results from numerous studies using a variety of enzyme inhibitors or polyamine analogues interfering with either the metabolism or the physiological functions of the polyamines. However, the presence of non-specific effects may be hard to rule out in such studies. In the present study, we have for the first time used a transgenic cell system to analyze the importance of polyamines in cell growth. We have earlier shown that expression of trypanosomal ODC in an ODC-deficient variant of CHO cells (C55.7) supported growth of these otherwise polyamine auxotrophic cells. However, one of the transgenic cell lines grew much slower than the others. As shown in the present study, the level of ODC activity was much lower in these cells, and that was reflected in a reduction of cellular polyamine levels. Analysis of cell cycle kinetics revealed that reduction of growth was correlated to prolongation of the G1, S, and G2+M phases in the cells. Providing exogenous putrescine to the cells resulted in a normalization of polyamine levels as well as cell cycle kinetics indicating a causal relationship. |
| Databáze: | OpenAIRE |
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