Journal Article

<span class="smallCaps">d</span>,<span class="smallCaps">l</span>-Sulforaphane-induced cell death in human prostate cancer cells is regulated by inhibitor of apoptosis family proteins and Apaf-1

Sunga Choi, Karen L. Lew, Hui Xiao, Anna Herman-Antosiewicz, Dong Xiao, Charles K. Brown and Shivendra V. Singh

in Carcinogenesis

Volume 28, issue 1, pages 151-162
ISSN: 0143-3334
Published online January 2007 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgl144
d,l-Sulforaphane-induced cell death in human prostate cancer cells is regulated by inhibitor of apoptosis family proteins and Apaf-1

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d,l-Sulforaphane (SFN), a synthetic analogue of cruciferous vegetable-derived isomer l-SFN, suppresses proliferation of cancer cells by causing apoptosis but the mechanism of cell death is not fully understood. We used LNCaP (wild-type p53) and PC-3 (p53 deficient) human prostate cancer cells to gain further insights into the mechanism of SFN-induced apoptosis. The LNCaP cell line was relatively more sensitive to SFN-induced apoptosis compared with PC-3. The SFN treatment caused stabilization of p53 protein in LNCaP cells, but SFN-mediated apoptosis was not attenuated by knockdown of p53 protein. Instead, the differential sensitivity of these cells to SFN-induced apoptosis correlated with difference in kinetics of Bax conformational change. Ectopic expression of Bcl-2 failed to confer protection against SFN-induced cell death in LNCaP cells. Treatment of PC-3 cells with SFN resulted in a marked decrease in the levels of inhibitor of apoptosis (IAP) family proteins (cIAP1, cIAP2 and XIAP), which was accompanied by inhibition of nuclear translocation of p65-nuclear factor κB (NFκB). The effect of SFN on levels of IAP family proteins as well as transcriptional activity of NFκB was biphasic in LNCaP cells. The SFN-treated LNCaP and PC-3 cells exhibited a marked increase in protein level of Apaf-1, which was accompanied by an increase in transcriptional activity of E2F1. The SFN-induced apoptosis in both cell lines was significantly attenuated by Apaf-1 protein knockdown. In conclusion, the present study reveals a complex signaling mechanism involving Bax activation, downregulation of IAP family proteins and Apaf-1 induction in regulation of SFN-induced cell death.

Journal Article.  8129 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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