TY - JOUR
T1 - Mechanistic studies of the effects of the retinoid n-(4- hydroxyphenyl)retinamide on prostate cancer cell growth and apoptosis
AU - Shen, Jian Cheng
AU - Wang, Thomas T.Y.
AU - Chang, Shine
AU - Hursting, Stephen D.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1999
Y1 - 1999
N2 - To explore the mechanisms underlying the chemopreventive effects of the synthetic retinoid N-(4-hydroxyphenyl)retinamide (4-HPR) in prostate cancer, we evaluated the anti-proliferative and apoptosis-inducing effects of 4-HPR in the androgen-sensitive human prostate cancer cell line LNCaR 4-HPR decreased the number of viable LNCaP cells (as measured by the 3-(4,5- dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay) in a dose- dependent manner. Although 4-HPR exerted a modest G1 cell-cycle block (as determined by flow cytometry), its effect on reduced cell number appeared to result primarily from induction of apoptosis (as measured by an enzyme- linked immunosorbent assay and flow-cytometric assays). The mitogenic effects of R1881, a non-metabolizable androgen that potently induces LNCaP cell proliferation, was completely blocked by greater than 0.5 μM 4-HPR. Furthermore, increasing the R1881 concentration in the presence of 2.0 μM 4- HPR increased apoptotic cell death. 4-HPR decreased prostate-specific antigen (PSA) protein levels in conditioned medium and decreased PSA mRNA expression. 4-HPR also decreased the ratio of bcl-2 to bax mRNA expression in LNCaP cells by approximately 45%, indicating that the apoptotic effects of 4-HPR may be mediated, at least in part, by alterations in the bcl-2/bax-regulated apoptotic pathway. N-acetylcysteine (4 mM) completely blocked the anti- proliferative and apoptotic-inducing effects of 4-HPR, suggesting that an oxidative mechanism may be involved. We concluded that (i) 4-HPR exerts growth-suppressive and apoptotic effects on LNCaP cells, (ii) 4-HPR can interact with androgen to suppress proliferation and induce apoptosis, (iii) the apoptotic effects of 4-HPR may be mediated in part by the bcl-2/bax pathway, and (iv) a pro-oxidant mechanism may contribute to the anti- proliferative and apoptotic-inducing effects of 4-HPR.
AB - To explore the mechanisms underlying the chemopreventive effects of the synthetic retinoid N-(4-hydroxyphenyl)retinamide (4-HPR) in prostate cancer, we evaluated the anti-proliferative and apoptosis-inducing effects of 4-HPR in the androgen-sensitive human prostate cancer cell line LNCaR 4-HPR decreased the number of viable LNCaP cells (as measured by the 3-(4,5- dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay) in a dose- dependent manner. Although 4-HPR exerted a modest G1 cell-cycle block (as determined by flow cytometry), its effect on reduced cell number appeared to result primarily from induction of apoptosis (as measured by an enzyme- linked immunosorbent assay and flow-cytometric assays). The mitogenic effects of R1881, a non-metabolizable androgen that potently induces LNCaP cell proliferation, was completely blocked by greater than 0.5 μM 4-HPR. Furthermore, increasing the R1881 concentration in the presence of 2.0 μM 4- HPR increased apoptotic cell death. 4-HPR decreased prostate-specific antigen (PSA) protein levels in conditioned medium and decreased PSA mRNA expression. 4-HPR also decreased the ratio of bcl-2 to bax mRNA expression in LNCaP cells by approximately 45%, indicating that the apoptotic effects of 4-HPR may be mediated, at least in part, by alterations in the bcl-2/bax-regulated apoptotic pathway. N-acetylcysteine (4 mM) completely blocked the anti- proliferative and apoptotic-inducing effects of 4-HPR, suggesting that an oxidative mechanism may be involved. We concluded that (i) 4-HPR exerts growth-suppressive and apoptotic effects on LNCaP cells, (ii) 4-HPR can interact with androgen to suppress proliferation and induce apoptosis, (iii) the apoptotic effects of 4-HPR may be mediated in part by the bcl-2/bax pathway, and (iv) a pro-oxidant mechanism may contribute to the anti- proliferative and apoptotic-inducing effects of 4-HPR.
KW - Fenretinide
KW - LNCaP
KW - N-(4-hydroxyphenyl)retinamide
KW - Prostate cancer
UR - http://www.scopus.com/inward/record.url?scp=0032903982&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032903982&partnerID=8YFLogxK
U2 - 10.1002/(SICI)1098-2744(199903)24:3<160::AID-MC2>3.0.CO;2-M
DO - 10.1002/(SICI)1098-2744(199903)24:3<160::AID-MC2>3.0.CO;2-M
M3 - Article
C2 - 10204800
AN - SCOPUS:0032903982
SN - 0899-1987
VL - 24
SP - 160
EP - 168
JO - Molecular Carcinogenesis
JF - Molecular Carcinogenesis
IS - 3
ER -