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lüll Direct regulation of RNA polymerase III transcription by RB, p53 and c-Myc Felton-Edkins ZA; Kenneth NS; Brown TR; Daly NL; Gomez-Roman N; Grandori C; Eisenman RN; White RJCell Cycle 2003[May]; 2 (3): 181-4The synthesis of tRNA and 5S rRNA by RNA polymerase (pol) III is cell cycle regulated in higher organisms. Overexpression of pol III products is a general feature of transformed cells. These observations may be explained by the fact that a pol III-specific transcription factor, TFIIIB, is strongly regulated by the tumor suppressors RB and p53, as well as the proto-oncogene product c-Myc. RB and p53 repress TFIIIB, but this restraint can be lost in tumors through a variety of mechanisms. In contrast, c-Myc binds and activates TFIIIB, causing potent induction of pol III transcription. Using chromatin immunoprecipitation and RNA interference, we show that c-Myc interacts with tRNA and 5S rRNA genes in transformed cervical cells, stimulating their expression. Availability of pol III products may be an important determinant of a cell's capacity to grow. The ability to regulate pol III output may therefore be integral to the growth control functions of RB, p53 and c-Myc.|Animals[MESH]|Cell Division/*genetics[MESH]|Cell Transformation, Neoplastic/genetics/*metabolism[MESH]|DNA Polymerase III/genetics/*metabolism[MESH]|Eukaryotic Cells/*enzymology[MESH]|Humans[MESH]|Proto-Oncogene Mas[MESH]|Proto-Oncogene Proteins c-myc/genetics/*metabolism[MESH]|RNA/genetics[MESH]|Retinoblastoma Protein/genetics/*metabolism[MESH]|Transcription, Genetic/genetics[MESH]|Tumor Suppressor Protein p53/genetics/*metabolism[MESH] |