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• W2072667508 abstract "Natural polyamines, i.e., putrescine, spermidine, and spermine, are ubiquitous molecules essential for cell proliferation and differentiation. In the present study, the effect of polyamines on primary cultures of bovine aortic endothelial cells (BAECs), rat aortic smooth muscle cells (RASMCs), and a human melanoma cell line was examined. While in the absence of fetal calf serum (FCS) polyamines had no effect on viability, in the presence of FCS spermidine and spermine, at concentrations close to physiologic levels, induced a dose-dependent cell death, whereas putrescine was ineffective. RASMCs were significantly more sensitive than other cells. FACS analysis, oligo-nucleosome ELISA, Hoechst nuclear staining, and Annexin V-FITC quantification showed that cell death was likely due to apoptosis. Cells exposed to spermidine showed a marked increase of intracellular transglutaminase (TGase) activity ( approximately 30-fold over control). Inhibitors of polyamine oxidation or inhibitors of TGase activity prevented polyamine-induced apoptosis. Moreover, tissue TGase overexpression significantly increased cell sensitivity to polyamine, suggesting that this effect is likely related to enhanced intracellular TGase activity. These data indicate that polyamines may modulate cell viability through a novel TGase-dependent process." @default.
• W2072667508 created "2016-06-24" @default.
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• W2072667508 date "2001-11-01" @default.
• W2072667508 modified "2023-09-26" @default.
• W2072667508 title "Transglutaminase Activity Is Involved in Polyamine-Induced Programmed Cell Death" @default.
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• W2072667508 doi "https://doi.org/10.1006/excr.2001.5356" @default.
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