Cytokine response gene 8 (CR8) regulates the cell cycle G1-S phase transition and promotes cellular survival
Copyright policy )Cytokine response gene 8 (CR8) regulates the cell cycle G1-S phase transition and promotes cellular survival
Cellular proliferation and survival are modulated by the expression of specific genes. Cytokine response gene 8 (CR8), which was originally cloned as an IL-2-induced gene in human T lymphocytes, encodes a basic helix--loop--helix (bHLH) transcription factor. The CR8 gene product is highly conserved among human, mouse and rat, and contains sequence motifs that distinguish it from other bHLH families. The CR8 gene is ubiquitously expressed, and CR8 gene expression is induced by both growth-promoting as well as growth-inhibitory stimuli. As bHLH proteins have been found to regulate both the G1-S phase cell cycle transition, as well as cellular survival, the effects of CR8 on these processes were investigated. Ectopic CR8 expression in asynchronous U2OS cell cultures reduces the percentage of cells in the cell cycle S phase, and also slows the entry of G1-synchronized cells into S phase. The prolonged G1 interval correlates with impaired elevation of cyclin E protein and prolonged p21 protein expression in G1. CR8 expression also protects U2OS cells from serum-withdrawal induced apoptosis. These results indicate that CR8 is an important modulator of both the G1-S phase cell cycle transition, and cellular survival.
- University of Trento Italy
- Cornell University United States
Cyclin-Dependent Kinase Inhibitor p21, Cell Survival, Helix-Loop-Helix Motifs, Molecular Sequence Data, Amino Acid Sequence, Basic Helix-Loop-Helix Transcription Factors, Cell Survival, Cells; Cultured, Cyclin E; biosynthesis, Cyclin-Dependent Kinase Inhibitor p21, Cyclins; analysis, Cytokines; pharmacology, DNA; analysis, DNA-Binding Proteins; genetics, G1 Phase, Gene Expression Regulation, Helix-Loop-Helix Motifs, Humans, Interleukin-2; pharmacology, Molecular Sequence Data, S Phase, Transcription Factors; genetics, G1 Phase, DNA, S Phase, DNA-Binding Proteins, Gene Expression Regulation, Cyclins, Cyclin E, Basic Helix-Loop-Helix Transcription Factors, Cytokines, Humans, Interleukin-2, Amino Acid Sequence, Cells, Cultured, Transcription Factors
Cyclin-Dependent Kinase Inhibitor p21, Cell Survival, Helix-Loop-Helix Motifs, Molecular Sequence Data, Amino Acid Sequence, Basic Helix-Loop-Helix Transcription Factors, Cell Survival, Cells; Cultured, Cyclin E; biosynthesis, Cyclin-Dependent Kinase Inhibitor p21, Cyclins; analysis, Cytokines; pharmacology, DNA; analysis, DNA-Binding Proteins; genetics, G1 Phase, Gene Expression Regulation, Helix-Loop-Helix Motifs, Humans, Interleukin-2; pharmacology, Molecular Sequence Data, S Phase, Transcription Factors; genetics, G1 Phase, DNA, S Phase, DNA-Binding Proteins, Gene Expression Regulation, Cyclins, Cyclin E, Basic Helix-Loop-Helix Transcription Factors, Cytokines, Humans, Interleukin-2, Amino Acid Sequence, Cells, Cultured, Transcription Factors
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