Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 287, Issue 21, Pages 17241-17247Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M112.357038
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Funding
- Swedish Research Council
- Swedish Cancer Society
- Royal Physiographic Society in Lund
- Gyllenstiernska Krapperupsstiftelsen
- Skane University Hospital in Malmo Cancer Research Fund
- Per-Eric and Ulla Schyberg Foundation
- Cradfoord Foundation
- Gunnar Nilsson, H. Foundation
- G. Jeanssons Foundation
- O. and E. Ericsson Foundation
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In various tumors inactivation of growth control is achieved by interfering with the RB1 signaling pathway. Here, we describe that RB1 and gamma-tubulin proteins moderate each other's expression by binding to their respective gene promoters. Simultaneous reduction of RB1 and gamma-tubulin protein levels results in an E2F1-dependent up-regulation of apoptotic genes such as caspase 3. We report that in various tumors types, there is an inverse correlation between the expression levels of gamma-tubulin and RB1 and that in tumor cell lines with a nonfunctioning RB1, reduction of gamma-tubulin protein levels leads to induction of apoptosis. Thus, the RB1/gamma- tubulin signal network can be considered as a new target for cancer treatment.
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