TBP is differentially regulated by c-Jun N-terminal kinase 1 (JNK1) and JNK2 through Elk-1, controlling c-Jun expression and cell proliferation.
Emerging evidence supports the idea that the c-Jun N-terminal kinases (JNKs) possess overlapping but distinct functions. The potential roles of the ubiquitously expressed JNK1 and JNK2 in regulating expression of the central transcription initiation factor, TATA-binding protein ( TBP), were examined. Relative to wild-type fibroblasts, TBP was decreased in Jnk1(-/-) cells and increased in Jnk2(-/-) cells. Similarly, reduction of JNK1 in human hepatoma cells decreased TBP expression, whereas reduction of JNK2 enhanced it. JNK- mediated regulation of TBP expression occurs at the transcriptional level through their ability to target Elk-1, which directly regulates the TBP promoter in response to epidermal growth factor stimulation. JNK1 increases, whereas JNK2 decreases, the phosphorylation state of Elk-1, which differentially affects Elk-1 occupancy at a defined site within the TBP promoter. These JNK- mediated alterations in TBP expression, alone, serve to regulate c-Jun expression and fibroblast proliferation rates. These studies uncovered several new molecular events that distinguish the functions of JNK1 and JNK2 that are critical for their regulation of cellular proliferation.[1]References
- TBP is differentially regulated by c-Jun N-terminal kinase 1 (JNK1) and JNK2 through Elk-1, controlling c-Jun expression and cell proliferation. Zhong, S., Fromm, J., Johnson, D.L. Mol. Cell. Biol. (2007) [Pubmed]
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