The tumor suppressor p53 inhibits Net, an effector of Ras/extracellular signal-regulated kinase signaling.
The tumor suppressor function of p53 is linked to its ability to repress gene expression, but the mechanisms of specific gene repression are poorly understood. We report that wild-type p53 inhibits an effector of the Ras oncogene/mitogen-activated protein (MAP) kinase pathway, the transcription factor Net. Tumor-associated mutant p53s are less efficient inhibitors. p53 inhibits by preventing phosphorylation of Net by MAP kinases. Loss of p53 in vivo leads to increased Net phosphorylation in response to wound healing and UV irradiation of skin. Our results show that p53 can repress specific gene expression by inhibiting Net, a factor implicated in cell cycle entry.
Nakade
Koji
K
Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, 67404 Illkirch cedex, France.
Zheng
Hong
H
Ganguli
Gitali
G
Buchwalter
Gilles
G
Gross
Christian
C
Wasylyk
Bohdan
B
D000818:Animals; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics; D015536:Down-Regulation; D051766:Early Growth Response Protein 1; D017874:Immediate-Early Proteins; D051379:Mice; D008822:Mice, Transgenic; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D009154:Mutation; D015513:Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D050783:Proto-Oncogene Proteins c-ets; D015398:Signal Transduction / Q000502:physiology; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*; D014945:Wound Healing / Q000502:physiology; D018631:ras Proteins / Q000378:metabolism*
D004268:DNA-Binding Proteins; D051766:Early Growth Response Protein 1; C486109:Egr1 protein, mouse; C086924:Elk3 protein, mouse; D017874:Immediate-Early Proteins; D015513:Oncogene Proteins; D050783:Proto-Oncogene Proteins c-ets; D014157:Transcription Factors; D016159:Tumor Suppressor Protein p53; D020928:Mitogen-Activated Protein Kinases; D018631:ras Proteins