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alpha-Tocopheryl succinate activates protein kinase C in cellular and cell-free systems
Kentaro Kogure1, Susumu Hama, Satoru Goto
1Faculty of Pharmaceutical Sciences, The University of Tokushima, Shomachi-1, Tokushima 770-8505, Japan.
Journal of Nutritional Science and Vitaminology
|January 2, 2004
Summary
Alpha-tocopheryl succinate (TS) directly activates protein kinase C (PKC) in vascular smooth muscle cells. This activation, though requiring higher concentrations than phorbol 12-myristate 13-acetate (PMA), involves TS adopting a similar active conformation.
Area of Science:
- Biochemistry
- Molecular Biology
- Cellular Signaling
Background:
- Protein Kinase C (PKC) is a key enzyme in cellular signaling pathways.
- Alpha-tocopheryl succinate (TS), a derivative of Vitamin E, has known biological activities.
- The precise mechanism of TS interaction with PKC has not been fully elucidated.
Purpose of the Study:
- To investigate the direct effect of alpha-tocopheryl succinate (TS) on protein kinase C (PKC) activity.
- To determine if TS can activate PKC in vascular smooth muscle cells.
- To compare the activation potential of TS with phorbol 12-myristate 13-acetate (PMA).
Main Methods:
- Assessing PKC auto-phosphorylation in vascular smooth muscle cells treated with TS.
- Testing the activation of isolated PKC by TS and PMA.
- Utilizing molecular superimposition and computational analysis to model TS-PKC interaction.
Main Results:
- TS significantly increased PKC auto-phosphorylation in vascular smooth muscle cells.
- TS demonstrated the ability to activate isolated PKC, albeit at higher concentrations than PMA.
- Computational modeling suggested TS binds to PKC in an active conformation, similar to PMA.
Conclusions:
- Alpha-tocopheryl succinate (TS) directly interacts with and activates protein kinase C (PKC).
- TS activates PKC by adopting a conformation analogous to that of PMA.
- These findings provide insight into the molecular mechanism of TS-mediated PKC activation.