M. Li et al., INTRODUCTION OF WILD-TYPE P53 GENE DOWN-REGULATES THE EXPRESSION OF H-RAS GENE AND SUPPRESSES THE GROWTH OF BLADDER-CANCER CELLS, Urological research, 23(5), 1995, pp. 311-314
Retroviral vectors were used to introduce the wild-type p53 gene into
human bladder cancer cell lines BIU-87 and EJ, which express endogenou
s wt-p53 gene and have a mutation in H-ras gene. The expression of the
exogenous wt-p53 gene in cells suppresses the growth of the bladder c
ancer cells in standard culture and in soft agar and blocks the cell c
ycle progression in G1. The BIU-87 and EJ cells developed tumors with
average volumes of 6.53 cm(3) and 6.61 cm(3) in nude mice in 9 weeks a
fter inoculation, while the cells transduced with wt-p53 gene failed t
o form tumors. The expression of H-ras gene in bladder cancer cells wa
s reduced at mRNA level. These results suggest that the overexpression
of the wt-p53 gene suppresses the expression of mutant H-ms gene and
inhibits the tumor cell growth in vivo and in vitro.