Abstract Title:

Alpha-tocopheryl succinate induces cytostasis and apoptosis in osteosarcoma cells: the role of E2F1.

Abstract Source:

Biochem Biophys Res Commun. 2005 Jun 17;331(4):1515-21. PMID: 15883045

Abstract Author(s):

Renata Alleva, Maria Serena Benassi, Marco Tomasetti, Nina Gellert, Francesca Ponticelli, Battista Borghi, Piero Picci, Jiri Neuzil

Abstract:

Full Citation: "Alpha-tocopheryl succinate (alpha-TOS), a redox-inactive analog of vitamin E, induces cell cycle arrest, differentiation, and triggers apoptosis. We examined the ability of alpha-TOS to induce cytostasis and/or apoptosis in two human osteosarcoma cell lines, which carry wild-type pRb but differ in the p53 status. In the wt-p53 cells, alpha-TOS induced apoptosis, which was associated with p53 activation and enhanced E2F1 expression. Mutant p53 cells failed to undergo apoptosis when challenged with alpha-TOS. The cell growth arrest after alpha-TOS treatment was associated with a reduced expression of E2F1. Knocking down E2F1 rendered the alpha-TOS-sensitive cells rather resistant to the apoptotic stimulus inducing a marked and prolonged cell growth arrest. We conclude that alpha-TOS induces cell growth arrest or apoptosis involving E2F1."

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