Authors: Tomoko Yamaguchi Yoshio Miki Kiyotsugu Yoshida
Publish Date: 2010/06/19
Volume: 15, Issue: 8, Pages: 927-935
Abstract
In the DNA damage response cAbl tyrosine kinase is transiently accumulated in the nucleus and induces apoptosis however little is known about the mechanism underlying apoptosis induction via nuclear cAbl Here we demonstrate that the expression of human pituitary homeobox 1 Pitx1 transcription factor is increased after DNA damage Notably cAbl controls augmentation of Pitx1 at the posttranscriptional level Overexpression of cAbl induces tyrosine phosphorylation of Pitx1 either directly or indirectly We also show that upon exposure to genotoxic stress overexpression of Pitx1 is associated with marked induction of apoptosis that is independent of p53 status Importantly inhibition of cAbl kinase activity substantially attenuates Pitx1mediated apoptosis These findings provide evidence that cAbl participates in modulating Pitx1 expression in the apoptotic response to DNA damageThe authors thank Dr Lobie for GFPPitx1 plasmid This work was supported by grants from the Ministry of Education Science and Culture of Japan to KY and YM Takeda Science Foundation to KY Senri Life Science Foundation to KY Kowa Life Science Foundation to KY and Sankyo Foundation of Life Science to KY
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