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RAD9 enhances radioresistance of human prostate cancer cells through regulation of ITGB1 protein levels #MMPMID25111005
Broustas CG; Lieberman HB
Prostate 2014[Oct]; 74 (14): 1359-70 PMID25111005show ga
BACKGROUND: Mouse embryonic stem cells null for Rad9 are sensitive to deleterious effects of ionizing radiation exposure. Likewise, integrin ?1 is a known radioprotective factor. Previously, we showed that RAD9 downregulation in human prostate cancer cells reduces integrin ?1 protein levels and ectopic expression of Mrad9 restores inherent high levels. METHODS: We used RNA interference to knockdown Rad9 expression in PC3 and DU145 prostate cancer cells. These cells were then subjected to ionizing radiation, and integrin ?1 protein levels were measured by immunoblotting. Survival of irradiated cells was measured by clonogenicity, cell cycle analysis, PARP-1 cleavage, and trypan blue exclusion. RESULTS: The function of RAD9 in controlling integrin ?1 expression is unique and not shared by the other members of the 9-1-1 complex, HUS1 and RAD1. RAD9 or integrin ?1 silencing sensitizes DU145 and PC3 cells to ionizing radiation. Irradiation of DU145 cells with low levels of RAD9 induces cleavage of PARP-1 protein. High levels of ionizing radiation have no effect on integrin ?1 protein levels. However, when RAD9 downregulation is combined with 10 Gy of ionizing radiation in DU145 or PC3 cells, there is an additional 50% downregulation of integrin ?1 compared with levels in unirradiated RAD9 knockdown cells. Finally, PC3 cells growing on fibronectin display increased radioresistance. However, PC3 cells with RAD9 knockdown are no longer protected by fibronectin after treatment with ionizing radiation. CONCLUSIONS: Downregulation of RAD9 when combined with ionizing radiation results in reduction of ITGB1 protein levels in prostate cancer cells, and increased lethality.