Deregulation of Wnt/β-catenin signaling is thought to play a critical role in human carcinogenesis. Nemo-like kinase (NLK) is an evolutionarily conserved serine/threonine kinase that suppresses β-catenin/T-cell factor (TCF) complex transcriptional activity through phosphorylation of TCF. Since NLK may be a tumor suppressor as a negative regulator of Wnt/β-catenin pathway, we established tetracycline-inducible NLK and its kinase-negative mutant expression in DLD-1 human colon cancer cells to analyze the effect of NLK on cell growth and viability. The induction of wild-type NLK in DLD-1 cells caused suppression of cell growth whereas the kinase-negative mutant did not. Flow cytometry indicated that NLK expression increased the number of apoptotic cells but did not induce obvious cell cycle arrest. Apoptosis induction by wild-type NLK was confirmed using TUNEL assays. Our results suggest that overexpression of NLK may have targets other than TCF for induction of apoptosis in human colon carcinoma cells.
|ジャーナル||Biochemical and Biophysical Research Communications|
|出版ステータス||Published - 2003 8 22|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology