Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
1597292
Reference Type
Journal Article
Title
Increased expression of p21Waf1/Cip1 and JNK with costimulation of prostate cancer cell activation by an siRNA Egr-1 inhibitor
Author(s)
Parra, E; Gutiérrez, L; Ferreira, J
Year
2013
Is Peer Reviewed?
1
Journal
Oncology Reports
ISSN:
1021-335X
EISSN:
1791-2431
Volume
30
Issue
2
Page Numbers
911-916
Language
English
PMID
23715767
DOI
10.3892/or.2013.2503
Web of Science Id
WOS:000321937600048
Abstract
The p21Waf1/Cip1 protein (hereafter, p21) and the c‑Jun N-terminal kinase (JNK) are two well-characterized cell modulators that play a crucial role in cell differentiation, senescence and apoptosis. Here, we report that transcription of the p21Waf1/Cip1 and JNK-1 genes is affected by inhibition of the early growth response-1 (Egr-1) in response to a small interfering RNA [siRNA)-Egr-1] in LNCaP and PC-3 prostate carcinoma cell lines. The expression levels of protein were determined by western blotting, and apoptosis was measured by propidium iodide staining and flow cytometric analysis. Inhibition of Egr-1, p21 and JNK-1 was carried out by siRNAs. LNCaP and PC-3 cells exhibited readily detectable Egr-1, JNK and p21, even in low serum medium without the addition of other exogenous agents. The expression of Egr-1, p21 and JNK was strongly increased after treatment of the cells with TPA, tumor necrosis factor-α (TNF-α) or arsenite. Suppression of Egr-1 expression by siRNA abrogated the ability of TPA to induce Egr-1 and JNK-1 activities, moderately increasing the p21 activity and abrogating the anti-apoptotic effect of Egr-1 observed in the prostate cancer cell lines. Moreover, blockade of p21 and JNK was unable to decrease the activity of Egr-1, while siRNA against p21 abrogated the pro‑apoptotic effect of p21. The results demonstrated that Egr-1 acts as a key player in prostate tumor cell growth and survival, while p21 plays a key pro‑apoptotic role in LNCaP and PC-3 prostate carcinoma cell lines.
Keywords
PC-3; LNCaP; early growth response-1; p21; c-Jun N-terminal kinase
Tags
IRIS
•
Arsenic Hazard ID
PubMed
Excluded
Non Peer Reviewed
PubMed
Excluded
Non Peer Reviewed
PubMed
WOS
Excluded
Non Peer Reviewed
2. Lit Search Updates through Oct 2015
PubMed
WOS
Initial Filter
Non Peer Reviewed
•
Arsenic (Inorganic)
1. Literature
Lit search updates through Oct 2015
2. Initial Filter
Non peer-reviewed
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity