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Vol. 55, Issue 3, 403-410, March 1999
Department of Thoracic/Head and Neck Medical Oncology, The
University of Texas M. D. Anderson Cancer Center, Houston, Texas
The synthetic retinoid N-(4-hydroxyphenyl)retinamide
(4HPR) has been shown to induce apoptosis in various malignant cells including human prostate carcinoma cells (HPC). We examined several possible mechanisms by which 4HPR could induce apoptosis in HPC cells.
4HPR exhibited concentration- and time-dependent decrease in cell
number both in androgen-dependent (LNCaP) and -independent (DU145 and
PC-3) cells. The 4HPR concentrations causing 50% decrease in cell
number in LNCaP, DU145, and PC-3 cultures were 0.9 ± 0.16, 4.4 ± 0.45, and 3.0 ± 1.0 µM, respectively, indicating
that LNCaP cells were more sensitive to 4HPR than the other cells.
4HPR-induced apoptosis in all three cell lines was evidenced by
increased enzymatic labeling of DNA breaks and formation of a DNA
ladder. 4HPR increased the level of reactive oxygen species, especially
in LNCaP cells. 4HPR-induced apoptosis could be suppressed in LNCaP
cells by antioxidant and in DU145 cells by a nuclear retinoic acid
receptor-specific antagonist, suggesting the involvement of reactive
oxygen species or retinoic acid receptors in mediating apoptosis
induced by 4HPR in the different HPC cells. Furthermore, 4HPR modulated
the expression levels of some apoptosis-related gene (p21,
c-myc, and c-jun), which may also
contribute to the induction of apoptosis by 4HPR in HPC cells.
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