Suppression of p53 function in normal human mammary epithelial cells increases sensitivity to extracel- lular matrix-induced apoptosis. J. Cell Biol., 155, 471-486.Seewaldt, V. L., Mrozek, K., Sigle, R., Dietze, E. C., Heine, K., Hockenbery, D. M., Hobbs, K. B. and ...
These factors combine to decrease the induced level of the p53 protein in PARP-deficient cells by 4-5-fold, compared to normal cells. However, there is virtually no decrease in the induction of p53 activity in PARP-deficient cells, as assayed with a p53-responsive promoter. Furthermore, ...
Normal cells contain p53 protein in a latent state that can be activated for sequence-specific transcription by low levels of UV radiation without an increase in protein levels. Microinjection of cells with an antibody specific to the C-terminal negative regulatory domain can activate the function ...
The expression and function of p53 tumor suppressor protein was investigated in T-cells immortalized by the Tax1 protein of HTLV-I. Conformationally wild-type p53 was expressed at elevated levels in Tax1-immortalized T-cells by post-transcriptional mechanisms when compared with normal T-cells. Luci...
We have exploited this loss of p53 function in the regulation of gene transcription to develop a novel gene therapy strategy that maximizes expression of the potential therapeutic gene in tumors while simultaneously down-regulating the same gene in normal cells. In one construct (unit I), the ...
We report that the expression of murine or human mutant p53 proteins in cells with no endogenous p53 proteins confers new or additional phenotypes upon these cells. Mutant p53 proteins expressed in cell lines lacking p53 resulted in either enhanced tumor
Cell proliferation, DNA repair, and p53 function are not required for programmed death of prostatic glandular cells induced by androgen ablation. Androgen ablation induces programmed death of androgen-dependent prostatic glandular cells, resulting in fragmentation of their genomic DNA and the cells t.....
The role of the tumor suppressor protein p53 in apoptosis of mouse hepatoma cells was studied. Different lines were used which were either p53 wild-type or carried various types of heterozygous or homozygous p53 mutations. The presence of mutations was demonstrated to correlate with a lack in tra...
Background We have demonstrated that in some human cancer cells both chronic mild heat and ionizing radiation exposures induce a transient block in S and G2 phases of the cell cycle. During this delay, cyclin B1 protein accumulates to supranormal levels, cyclin B1-dependent kinase is activated,...
Exosomes take part in a larger communication network in which cells communicate between one another by DNA shuttling, proteins, RNA, and membrane-bound factors. The machinery of protein quality control occurs through the process termed “exosome biogenesis”. Furthermore, the pathway involved in ...