Induction of apoptotic cell death by putrescine
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Induction of apoptotic cell death by putrescine. / Takao, Koichi; Rickhag, Karl Mattias; Hegardt, Cecilia; Oredsson, Stina; Persson, Lo.
I: International Journal of Biochemistry & Cell Biology, Bind 38, Nr. 4, 2006, s. 621-8.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Induction of apoptotic cell death by putrescine
AU - Takao, Koichi
AU - Rickhag, Karl Mattias
AU - Hegardt, Cecilia
AU - Oredsson, Stina
AU - Persson, Lo
PY - 2006
Y1 - 2006
N2 - The polyamines are essential for cellular growth and differentiation. Ornithine decarboxylase (ODC), which catalyses the first step in the biosynthesis of the polyamines, has a very fast turnover and is subject to a strong feedback control by the polyamines. In the present study, we show that overexpression of a metabolically stable ODC in CHO cells induced a massive cell death unless the cells were grown in the presence of the ODC inhibitor alpha-difluoromethylornithine (DFMO). Cells overexpressing wild-type (unstable) ODC, on the other hand, were not dependent on the presence of DFMO for their growth. The induction of cell death was correlated with a dramatic increase in cellular putrescine levels. Analysis using flow cytometry revealed perturbed cell cycle kinetics, with a large accumulation of cells with sub-G1 amounts of DNA, which is a typical sign of apoptosis. Another strong indication of apoptosis was the finding that one of the key enzymes in the apoptotic process, caspase-3, was induced when DFMO was omitted from the growth medium. Furthermore, inhibition of the caspase activity significantly reduced the recruitment of cells to the sub-G1 fraction. In conclusion, deregulation of polyamine homeostasis may negatively affect cell proliferation and eventually lead to cell death by apoptosis if putrescine levels become too high.
AB - The polyamines are essential for cellular growth and differentiation. Ornithine decarboxylase (ODC), which catalyses the first step in the biosynthesis of the polyamines, has a very fast turnover and is subject to a strong feedback control by the polyamines. In the present study, we show that overexpression of a metabolically stable ODC in CHO cells induced a massive cell death unless the cells were grown in the presence of the ODC inhibitor alpha-difluoromethylornithine (DFMO). Cells overexpressing wild-type (unstable) ODC, on the other hand, were not dependent on the presence of DFMO for their growth. The induction of cell death was correlated with a dramatic increase in cellular putrescine levels. Analysis using flow cytometry revealed perturbed cell cycle kinetics, with a large accumulation of cells with sub-G1 amounts of DNA, which is a typical sign of apoptosis. Another strong indication of apoptosis was the finding that one of the key enzymes in the apoptotic process, caspase-3, was induced when DFMO was omitted from the growth medium. Furthermore, inhibition of the caspase activity significantly reduced the recruitment of cells to the sub-G1 fraction. In conclusion, deregulation of polyamine homeostasis may negatively affect cell proliferation and eventually lead to cell death by apoptosis if putrescine levels become too high.
KW - Animals
KW - Apoptosis
KW - CHO Cells
KW - Caspase 3
KW - Caspases
KW - Cell Differentiation
KW - Cell Proliferation
KW - Cricetinae
KW - Cricetulus
KW - Eflornithine
KW - Enzyme Inhibitors
KW - G1 Phase
KW - Ornithine Decarboxylase
KW - Ornithine Decarboxylase Inhibitors
KW - Putrescine
U2 - 10.1016/j.biocel.2005.10.020
DO - 10.1016/j.biocel.2005.10.020
M3 - Journal article
C2 - 16406751
VL - 38
SP - 621
EP - 628
JO - International Journal of Biochemistry & Cell Biology
JF - International Journal of Biochemistry & Cell Biology
SN - 1357-2725
IS - 4
ER -
ID: 132931407