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- W2210304785 abstract "Wild-type (wt) p53 is a tumor-suppressor protein which acts via transcriptional and transcriptional-independent mechanisms. The transcriptional function of p53 is mediated by specific responsive elements (REs). The MDM2, WAF1/Cip1 and Bax genes possess p53REs and their activation by wt p53 induces cell cycle progression, arrest and programmed cell death (apoptosis), respectively. Mutations of the p53 gene are detected in more than 50% of the human malignant tumors. p53 mutants seem to have a more stable conformation and are suggested to exert dominant-negative inhibition of wt p53 in cells containing both wt and mutant (mt) alleles. However, recent studies show that certain mt p53 proteins posses a gain of function phenotype. In the present study, we examined the effects of the second most frequent p53 mutant R273H on the p53REs of the MDM2, WAF1/Cip1 and Bax genes in the H1299 non-small cell lung carcinoma cell line. Although mt p53 R273H alone was unable to bind and transactivate the corresponding p53REs, it enhanced the MDM2-p53RE mediated gene transcription of wt p53 (positive-dominant effect) and prevented the wt p53 transactivation of the p53REs of WAF1/Cip1 and Bax genes (negative-dominant effect). Our data suggest that in the appropriate environment, differential transcription of critical p53 target genes by certain p53 mutant proteins may illustrate another mechanism implicated in tumor development." @default.
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- W2210304785 title "Modulation of wild-type p53 activity by mutant p53 R273H depends on the p53 responsive element (p53RE). A comparative study between the p53REs of the MDM2, WAFI/Cip1 and Bax genes in the lung cancer environment. WAFI/Cip1 = WAF1/Cip1." @default.
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