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The dietary bioflavonoid, quercetin, selectively induces apoptosis of prostate cancer cells by down-regulating the expression of heat shock protein 90

The Prostate, 2008-12, Vol.68 (16), p.1773-1789 [Peer Reviewed Journal]

Copyright © 2008 Wiley‐Liss, Inc. ;2008 INIST-CNRS ;2008 Wiley-Liss, Inc. 2008 ;ISSN: 0270-4137 ;EISSN: 1097-0045 ;DOI: 10.1002/pros.20845 ;PMID: 18726985 ;CODEN: PRSTDS

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Title:
The dietary bioflavonoid, quercetin, selectively induces apoptosis of prostate cancer cells by down-regulating the expression of heat shock protein 90
Author: Aalinkeel, Ravikumar ; Bindukumar, B. ; Reynolds, Jessica L. ; Sykes, Donald E. ; Mahajan, Supriya D. ; Chadha, Kailash C. ; Schwartz, Stanley A.
Subjects: Adenocarcinoma - genetics ; Adenocarcinoma - metabolism ; Adenocarcinoma - pathology ; Annexin A5 - metabolism ; anti-cancer ; Antioxidants - pharmacology ; apoptosis ; Apoptosis - drug effects ; bioflavonoids ; Biological and medical sciences ; Caspase 3 - metabolism ; Caspase 9 - metabolism ; Cell Line, Tumor ; chaperone proteins ; Down-Regulation - drug effects ; Flavonoids - pharmacology ; Gynecology. Andrology. Obstetrics ; HSP90 Heat-Shock Proteins - genetics ; HSP90 Heat-Shock Proteins - metabolism ; Humans ; Insulin-Like Growth Factor Binding Protein 2 - metabolism ; Male ; Male genital diseases ; Medical sciences ; Nephrology. Urinary tract diseases ; polyphenols ; Prostatic Neoplasms - genetics ; Prostatic Neoplasms - metabolism ; Prostatic Neoplasms - pathology ; Proteomics ; quercetin ; Quercetin - pharmacology ; RNA, Small Interfering - genetics ; Transfection ; Tumors ; Tumors of the urinary system ; Urinary tract. Prostate gland
Is Part Of: The Prostate, 2008-12, Vol.68 (16), p.1773-1789
Description: BACKGROUND Human and animal studies have suggested that diet‐derived flavonoids, in particular quercetin may play a beneficial role by preventing or inhibiting oncogenesis, but the underlying mechanism remains unclear. The aim of this study is to evaluate the effect(s) of quercetin on normal and malignant prostate cells and to identify the target(s) of quercetin's action. METHODOLOGY We addressed this question using cells in culture and investigated whether quercetin affects key biological processes responsible for tumor cell properties such as cell proliferation and apoptosis and also studied the effect of quercetin on the proteome of prostate cancer cells using difference gel electrophoresis (DIGE) to assess changes in the expression of relevant proteins. RESULTS Our findings demonstrate that quercetin treatment of prostate cancer cells results in decreased cell proliferation and viability. Furthermore, we demonstrate that quercetin promotes cancer cell apoptosis by down‐regulating the levels of heat shock protein (Hsp) 90. Depletion of Hsp90 by quercetin results in decreased cell viability, levels of surrogate markers of Hsp90 inhibition (intracellular and secreted), induced apoptosis and activation of caspases in cancer cells but not in normal prostate epithelial cells. Knockdown of Hsp90 by short interfering RNA also resulted in induction apoptosis similar to quercetin in cancer cells as indicated by annexin V staining. CONCLUSION Our results demonstrate that quercetin down‐regulates the expression of Hsp90 which, in turn, induces inhibition of growth and cell death in prostate cancer cells while exerting no quantifiable effect on normal prostate epithelial cells. Prostate © 2008 Wiley‐Liss, Inc.
Publisher: Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Language: English
Identifier: ISSN: 0270-4137
EISSN: 1097-0045
DOI: 10.1002/pros.20845
PMID: 18726985
CODEN: PRSTDS
Source: MEDLINE
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The dietary bioflavonoid, quercetin, selectively induces apoptosis of prostate cancer cells by down-regulating the expression of heat shock protein 90

Copyright © 2008 Wiley‐Liss, Inc. ;2008 INIST-CNRS ;2008 Wiley-Liss, Inc. 2008 ;ISSN: 0270-4137 ;EISSN: 1097-0045 ;DOI: 10.1002/pros.20845 ;PMID: 18726985 ;CODEN: PRSTDS

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