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Title Page
ABSTRACT
Contents
ABBREVIATIONS 9
INTRODUCTION 10
MATERIALS AND METHODS 13
Cell culture and construction of stable cell lines 13
Yeast two-hybrid assay 13
Immunoprecipitation and GST pull-down assay 14
Immunoblotting, immunofluorescence and immunohistochemistry assay 14
Semi-quantitative RT-PCR assay 15
Expression plasmids, siRNA and transfection 15
Cell cycle, apoptosis and colony formation assay 16
Senescence associated-β-galactosidase activity assay 16
Ubiquitination assay 16
Animal studies 17
Statistical analysis 17
RESULTS 18
Identification of ZNF313 as a novel XAF1-binding protein 18
ZNF313 increases XAF1 protein stability 18
ZNF313 is a novel cell cycle activator with proapoptotic potential 19
ZNF313 is a negative regulator of cellular senescence 19
ZNF313 is a specific antagonist of the CIP/KIP family members of CDK inhibitors 20
ZNF313 promotes ubiquitination and degradation of p21 WAF1(이미지참조) 21
ZNF313 stimulates a G1 to S phase transition of the cell cycle 22
ZNF313 is reduced in differentiation process 23
ZNF313 is elevated in cancer cells 23
DISCUSSION 57
REFERENCES 61
ABSTRACT IN KOREAN 66
Figure 1. Identification of ZNF313 25
Figure 2. In vivo and in vitro protein binding between ZNF313 and XAF1 26
Figure 3. Characterization of XAF1-interacting region of ZNF313 27
Figure 4. ZNF313 up-regulates XAF1 28
Figure 5. Decreased polyubiquitination of XAF1 by ZNF313 29
Figure 6. ZNF313 stimulates apoptosis 30
Figure 7. ZNF313's effect on apoptosis and cell cycle arrest 31
Figure 8. ZNF313 effect on cellular response to genotoxic stresses 32
Figure 9. Effect of ZNF313 on tumor growth 33
Figure 10. ZNF313 is a negative regulator of cellular senescence 34
Figure 11. Downregulation of ZNF313 during replicative senescence 35
Figure 12. ZNF313 in premature senescence 36
Figure 13. XAF1-independency of ZNF313 regulation of cellular senescence 37
Figure 14. p53-independent induction of cellular senescence by ZNF313 depletion 38
Figure 15. ZNF313 destabilizes CIP/KIP proteins 39
Figure 16. ZNF313 blocks p21 WAF1-mediated cellular senescence(이미지참조) 40
Figure 17. No effect of ZNF313 on G1 cell cycle arrest in p21 WAF1-deficient cells(이미지참조) 41
Figure 18. p21 WAF1 dependent effect of ZNF313 on colony formation of tumor cells(이미지참조) 42
Figure 19. p53-independent regulation of p21 WAF1 by ZNF313(이미지참조) 43
Figure 20. No effect of ZNF313 depletion on SAHF formation 44
Figure 21. Elevation of p21 WAF1 protein stability by ZNF313-depletion(이미지참조) 45
Figure 22. Validation of the E3 ligase activity of ZNF313 46
Figure 23. RING on ZNF313 is responsible for p21 WAF1-degradation(이미지참조) 47
Figure 24. Cell cycle-associated regulation of ZNF313 expression 48
Figure 25. Expression kinetics of ZNF313 during the cell cycle 49
Figure 26. ZNF313 modulates G1 to S cell cycle transition 50
Figure 27. ZNF313 protein induction by growth factors 51
Figure 28. ZNF313 depletion inhibits p21 WAF1-dependent G1-S transition(이미지참조) 52
Figure 29. ZNF313 is decreased in differentiated cells 53
Figure 30. Expression of ZNF313 and p21 WAF1 in differentiating mouse brain(이미지참조) 54
Figure 31. Elevated ZNF313 level in cancer cells 55
Figure 32. Translocalization of ZNF313 during cancer progression 56
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