Journal of Plant Biology

, Volume 49, Issue 2, pp 153–159 | Cite as

Changes in cellular polyamine contents and activities of their biosynthetic enzymes at each phase of the cell cycle in by-2 cells

  • Su Jin Jang
  • Hyun Wook Cho
  • Ky Young Park
  • Yong-Bum Kim


We analyzed changes in polyamine contents and the activities of biosynthetic enzymes during each phase of the cell cycle for a synchronized population of BY-2 cells. Based on our analysis of H3-thymidine incorporation flow cytometry, and the mitotic index, the M and G2 phases seemed to occur at 8 h and from 2.5 to 8 h, respectively, after the release of aphidicolin. The respective activities of arginine decarboxylase (ADC), Ornithine decarboxylase (ODC), and S-adenosyl methionine decarboxylase (SAMDC) at the beginning (7.4, 11.2, and 5.5 nmol mg-1 protein h-1) were increased to 22.6, 22.1, and 15.1 nmol mg-1 protein h-1. However, those increases do not coincide with the general change in polyamines reported from animal cells. In addition, the bi-phasic activation of polyamine biosynthetic enzymes, such as those found in the general animal model, was observed with ADC and ODC but not with SAMDC. These results suggest that the general animal model for explaining polyamine changes and SAMDC activation in the cell cycle cannot be applied to BY-2 cells. Further, our flow-cytometric analysis of cell populations may be a useful tool for evaluating the effects of polyamines on cell cycle progression in BY-2 cells.


BY-2 cells cell cycle flow-cytometric analysis Nicotiana tabacum polyamines S-adenosyl methionine decarboxylase 



Arginine decarboxylase


decarboxylated S-adenosyl methionine


Ornithine decarboxylase


S-adenosyl methionine


S-adenosyl methionine decarboxylase


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Copyright information

© The Botanical Society of Korea 2006

Authors and Affiliations

  1. 1.Department of BiologyCollege of Natural Science, Sunchon National UniversitySunchonKorea
  2. 2.Institute of Basic ScienceSunchon National UniversitySunchonKorea

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