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Induction of cancer cell apoptosis by α‐tocopheryl succinate: molecular pathways and structural requirements

Induction of cancer cell apoptosis by α‐tocopheryl succinate: molecular pathways and structural... The vitamin E analog α‐tocopheryl succinate (α‐TOS) can induce apoptosis. We show that the proapoptotic activity of α‐TOS in hematopoietic and cancer cell lines involves inhibition of protein kinase C (PKC), since phorbol myristyl acetate prevented α‐TOS‐triggered apoptosis. More selective effectors indicated that α‐TOS reduced PKCα isotype activity by increasing protein phosphatase 2A (PP2A) activity. The role of PKCα inhibition in α‐TOS‐induced apoptosis was confirmed using antisense oligonucleotides or PKCα overexpression. Gain‐ or loss‐of‐function bcl‐2 mutants implied modulation of bcl‐2 activity by PKC/ PP2A as a mitochondrial target of α‐TOS‐induced proapoptotic signals. Structural analogs revealed that α‐tocopheryl and succinyl moieties are both required for maximizing these effects. In mice with colon cancer xenografts, α‐TOS suppressed tumor growth by 80%. This epitomizes cancer cell killing by a pharmacologically relevant compound without known side effects.—Neuzil, J., Weber, T., Schröder, A., Lu, M., Ostermann, G., Gellert, N., Mayne, G. C., Olejnicka, B., Nègre‐Salvayre, A., Stícha, M., Coffey, R. J., Weber, C. Induction of cancer cell apoptosis by α‐tocopheryl succinate: molecular pathways and structural requirements. FASEB J. 15, 403‐415 (2001) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The FASEB Journal Wiley

Induction of cancer cell apoptosis by α‐tocopheryl succinate: molecular pathways and structural requirements

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References (63)

Publisher
Wiley
Copyright
© Federation of American Societies for Experimental Biology
eISSN
1530-6860
DOI
10.1096/fj.00-0251com
Publisher site
See Article on Publisher Site

Abstract

The vitamin E analog α‐tocopheryl succinate (α‐TOS) can induce apoptosis. We show that the proapoptotic activity of α‐TOS in hematopoietic and cancer cell lines involves inhibition of protein kinase C (PKC), since phorbol myristyl acetate prevented α‐TOS‐triggered apoptosis. More selective effectors indicated that α‐TOS reduced PKCα isotype activity by increasing protein phosphatase 2A (PP2A) activity. The role of PKCα inhibition in α‐TOS‐induced apoptosis was confirmed using antisense oligonucleotides or PKCα overexpression. Gain‐ or loss‐of‐function bcl‐2 mutants implied modulation of bcl‐2 activity by PKC/ PP2A as a mitochondrial target of α‐TOS‐induced proapoptotic signals. Structural analogs revealed that α‐tocopheryl and succinyl moieties are both required for maximizing these effects. In mice with colon cancer xenografts, α‐TOS suppressed tumor growth by 80%. This epitomizes cancer cell killing by a pharmacologically relevant compound without known side effects.—Neuzil, J., Weber, T., Schröder, A., Lu, M., Ostermann, G., Gellert, N., Mayne, G. C., Olejnicka, B., Nègre‐Salvayre, A., Stícha, M., Coffey, R. J., Weber, C. Induction of cancer cell apoptosis by α‐tocopheryl succinate: molecular pathways and structural requirements. FASEB J. 15, 403‐415 (2001)

Journal

The FASEB JournalWiley

Published: Feb 1, 2001

Keywords: vitamin E succinate; protein kinase C; programmed cell death; colon cancer

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