Induction of caspase-mediated apoptosis and cell-cycle G1 arrest by selenium metabolite methylselenol

Zaisen Wang, Cheng Jiang, Junxuan Lu

Research output: Contribution to journalArticle

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Abstract

Previous work based on mono-methyl selenium compounds that are putative precursors of methylselenol has strongly implicated this metabolite in the induction of caspase-mediated apoptosis of human prostate carcinoma and leukemia cells and G1 arrest in human vascular endothelial and cancer epithelial cells. To test the hypothesis that methylselenol itself is responsible for exerting these cellular effects, we examined the apoptotic action on DU145 human prostate cancer cells and the G arrest effect on the human umbilical vein endothelial cells (HUVECs) of methylselenol generated with seleno-L-methionine as a substrate for L-methionine-α-deamino-γ-mercaptomethane lyase (EC4.4.1.11, also known as methioninase). Exposure of DU145 cells to methylselenol so generated in the submicromolar range led to caspase-mediated cleavage of poly(ADP-ribose) polymerase, nucleosomal DNA fragmentation, and morphologic apoptosis and resulted in a profile of biochemical effects similar to that of methylseleninic acid (MSeA) exposure, as exemplified by the inhibition of phosphorylation of protein kinase AKT and extracellularly regulated kinases 1/2. In HUVEC, methylselenol exposure recapitulated the G1 arrest action of MSeA in mitogen-stimulated G1progression during mid-G1 to late G1. This stage specificity was mimicked by inhibitors of phosphatidylinositol 3-kinase. The results support methylselenol as an active selenium metabolite for inducing caspase-mediated apoptosis and cell-cycle G1 arrest. This cell-free methylselenol-generation system is expected to have significant usefulness for studying the biochemical and molecular targeting mechanisms of this critical metabolite and may constitute the basis of a novel therapeutic approach for cancer, using seleno-L-methionine as a prodrug.

Original languageEnglish (US)
Pages (from-to)113-120
Number of pages8
JournalMolecular Carcinogenesis
Volume34
Issue number3
DOIs
StatePublished - Jul 20 2002

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G1 Phase Cell Cycle Checkpoints
Selenium
Caspases
Apoptosis
Methionine
Human Umbilical Vein Endothelial Cells
Selenium Compounds
Phosphatidylinositol 3-Kinase
Gastrin-Secreting Cells
Lyases
Poly(ADP-ribose) Polymerases
Prodrugs
DNA Fragmentation
methaneselenol
Mitogens
Protein Kinases
Blood Vessels
Prostate
Neoplasms
Prostatic Neoplasms

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Cancer Research

Cite this

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abstract = "Previous work based on mono-methyl selenium compounds that are putative precursors of methylselenol has strongly implicated this metabolite in the induction of caspase-mediated apoptosis of human prostate carcinoma and leukemia cells and G1 arrest in human vascular endothelial and cancer epithelial cells. To test the hypothesis that methylselenol itself is responsible for exerting these cellular effects, we examined the apoptotic action on DU145 human prostate cancer cells and the G arrest effect on the human umbilical vein endothelial cells (HUVECs) of methylselenol generated with seleno-L-methionine as a substrate for L-methionine-α-deamino-γ-mercaptomethane lyase (EC4.4.1.11, also known as methioninase). Exposure of DU145 cells to methylselenol so generated in the submicromolar range led to caspase-mediated cleavage of poly(ADP-ribose) polymerase, nucleosomal DNA fragmentation, and morphologic apoptosis and resulted in a profile of biochemical effects similar to that of methylseleninic acid (MSeA) exposure, as exemplified by the inhibition of phosphorylation of protein kinase AKT and extracellularly regulated kinases 1/2. In HUVEC, methylselenol exposure recapitulated the G1 arrest action of MSeA in mitogen-stimulated G1progression during mid-G1 to late G1. This stage specificity was mimicked by inhibitors of phosphatidylinositol 3-kinase. The results support methylselenol as an active selenium metabolite for inducing caspase-mediated apoptosis and cell-cycle G1 arrest. This cell-free methylselenol-generation system is expected to have significant usefulness for studying the biochemical and molecular targeting mechanisms of this critical metabolite and may constitute the basis of a novel therapeutic approach for cancer, using seleno-L-methionine as a prodrug.",
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Induction of caspase-mediated apoptosis and cell-cycle G1 arrest by selenium metabolite methylselenol. / Wang, Zaisen; Jiang, Cheng; Lu, Junxuan.

In: Molecular Carcinogenesis, Vol. 34, No. 3, 20.07.2002, p. 113-120.

Research output: Contribution to journalArticle

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