Polyphenon E Effects on Gene Expression in PC-3 Prostate Cancer Cells

Polyphenon E (Poly E) is a standardized, caffeine-free green tea extract with defined polyphenol content. Poly E is reported to confer chemoprotective activity against prostate cancer (PCa) progression in the TRAMP model of human PCa, and has shown limited activity against human PCa in human trials....

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Published in:International journal of molecular sciences 2022-11, Vol.23 (22), p.14328
Main Authors: Carastro, L Michael, Vallebuona, Ethan J, Cordova, Ricardo, Gannon, Ashely N, Kim, Seung Joon, Costello, Corrine M, Declet-Bauzo, Ricardo A, Kumar, Nagi, Park, Jong Y
Format: Article
Language:English
Subjects:
Basic Helix-Loop-Helix Leucine Zipper Transcription Factors - genetics
Caffeine
Catechin - pharmacology
DNA chips
DNA microarray
DNA microarrays
Gene Expression
Genes
Green tea
Humans
Male
Molecular modelling
MXD1
PC-3 Cells
Polymerase chain reaction
Polyphenols
polyphenon E
Prostate cancer
Prostatic Neoplasms - drug therapy
Prostatic Neoplasms - genetics
Prostatic Neoplasms - metabolism
Repressor Proteins - genetics
RGS4
Tea
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Summary:Polyphenon E (Poly E) is a standardized, caffeine-free green tea extract with defined polyphenol content. Poly E is reported to confer chemoprotective activity against prostate cancer (PCa) progression in the TRAMP model of human PCa, and has shown limited activity against human PCa in human trials. The molecular mechanisms of the observed Poly E chemopreventive activity against PCa are not fully understood. We hypothesized that Poly E treatment of PCa cells induces gene expression changes, which could underpin the molecular mechanisms of the limited Poly E chemoprevention activity against PCa. PC-3 cells were cultured in complete growth media supplemented with varied Poly E concentrations for 24 h, then RNA was isolated for comparative DNA microarray (0 vs. 200 mg/L Poly E) and subsequent TaqMan qRT-PCR analyses. Microarray data for 54,613 genes were filtered for >2-fold expression level changes, with 8319 genes increased and 6176 genes decreased. Eight genes involved in key signaling or regulatory pathways were selected for qRT-PCR. Two genes increased expression significantly, MXD1 (13.98-fold; p = 0.0003) and RGS4 (21.98-fold; p = 0.0011), by qRT-PCR. MXD1 and RGS4 significantly increased gene expression in Poly E-treated PC-3 cells, and the MXD1 gene expression increases were Poly E dose-dependent.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms232214328