Abstract
INACTIVATING mutations of the retinoblastoma gene (RB) are found in a wide variety of tumour cells1. Replacement of wild-type RB can suppress the tumorigenicity of some of these cells, suggesting that the RB protein (Rb) may negatively regulate cell growth2–4. As activation of c-myc expression promotes cell proliferation and blocks differentiation, it may positively regulate cell growth5–9. The c-myc protein is localized in the nucleus and can physically associate with RB protein in vitro10, hence c-myc may functionally antagonize RB function. Microinjection of Rb in Gl phase reversibly arrests cell-cycle progression11. Here we co-inject RB protein with c-myc, EJ-ras, c-fos or c-jun protein. Co-injection of c-myc, but not EJ-ras, c-fos or c-jun, inhibits the ability of Rb to arrest the cell cycle. The c-myc does not inhibit the activity of another tumour supressor, p53 (ref. 12). Thus, c-myc and RB specifically antagonize one another in the cell.
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Goodrich, D., Lee, WH. Abrogation by c-myc of Gl phase arrest induced by RB protein but not by p53. Nature 360, 177–179 (1992). https://doi.org/10.1038/360177a0
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DOI: https://doi.org/10.1038/360177a0
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