@article{APS4244,
author = {Shuang Wang and Ying Zheng and Yun Yu and Li Xia and Guo-qiang Chen and Yong-zong Yang and Li-shun Wang},
title = {Phosphorylation of β-actin by protein kinase C-delta in camptothecin analog-induced leukemic cell apoptosis},
journal = {Acta Pharmacologica Sinica},
volume = {29},
number = {1},
year = {2016},
keywords = {},
abstract = {Aim: This study was conducted to reveal new proteins involved in acute myeloid leukemia (AML) cell apoptosis.
Methods: Using camptothecin analog NSC606985-induced leukemic U937 cell apoptosis as a model, this study performed a differential proteomic analysis during apoptosis induction. The significantly modulated protein was underwent further investigation in the apoptotic process.
Results: We found that β-actin protein presented two different spots on the two-dimensional electrophoresis (2-DE) map, which shared similar molecular weight and different pI. Those two spots demonstrated contrary changes (disappeared on the basic-end and increased on the acid-end spot) during apoptosis induction, although the total level of b-actin kept constant. This observation was further confirmed by immunoblot analysis on 2-DE gel. When NSC606985-treated cell lysate was incubated with alkaline phosphotase, β-actin on the basic-end spot was restored, indicating increased phosphorylation of β-actin during NSC606985-induced apoptosis. Moreover, the polymerization of actin also decreased after NSC606985 treatment. The increased β-actin phosphorylation and decreased actin polymerization was antagonized by pre-treatment of rottlerin, a specific protein kinase C-delta (PKCδ) inhibitor.
Conclusion: All these results indicate that β-actin was phosphorylated during apoptosis induction, which was mediated by activated PKCδ.},
issn = {1745-7254}, url = {http://www.chinaphar.com/article/view/4244}
}