The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer.
In this study, we investigated whether PKR protein expression is correlated with mRNA levels and also evaluated molecular biomarkers that are associated with PKR, such as phosphorylated PKR (p-PKR) and phosphorylated eIF2α (p-eIF2α).We determined the levels of PKR protein expression and mRNA in 36 f...
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doaj-5b770c1d927140e5a20111f96b308a592020-11-25T02:32:24ZengPublic Library of Science (PLoS)PLoS ONE1932-62032011-01-01611e2485510.1371/journal.pone.0024855The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer.Yong HeArlene M CorreaMaria Gabriela RasoWayne L HofstetterBingliang FangCarmen BehrensJack A RothYihong ZhouLiping YuIgnacio I WistubaStephen G SwisherApar PataerIn this study, we investigated whether PKR protein expression is correlated with mRNA levels and also evaluated molecular biomarkers that are associated with PKR, such as phosphorylated PKR (p-PKR) and phosphorylated eIF2α (p-eIF2α).We determined the levels of PKR protein expression and mRNA in 36 fresh primary lung tumor tissues by using Western blot analysis and real-time reverse-transcriptase PCR (RT-PCR), respectively. We used tissue microarrays for immunohistochemical evaluation of the expression of p-PKR and p-eIF2α proteins. We demonstrated that PKR mRNA levels are significantly correlated with PKR protein levels (Spearman's rho = 0.55, p<0.001), suggesting that PKR protein levels in tumor samples are regulated by PKR mRNA. We also observed that the patients with high p-PKR or p-eIF2α expression had a significantly longer median survival than those with little or no p-PKR or p-eIF2α expression (p = 0.03 and p = 0.032, respectively). We further evaluated the prognostic effect of combined expression of p-PKR plus PKR and p-eIF2α plus PKR and found that both combinations were strong independent prognostic markers for overall patient survival on stage I and all stage patients.Our findings suggest that PKR protein expression may controlled by transcription level. Combined expression levels of PKR and p-PKR or p-eIF2α can be new markers for predicting the prognosis of patients with NSCLC.http://europepmc.org/articles/PMC3213082?pdf=render |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yong He Arlene M Correa Maria Gabriela Raso Wayne L Hofstetter Bingliang Fang Carmen Behrens Jack A Roth Yihong Zhou Liping Yu Ignacio I Wistuba Stephen G Swisher Apar Pataer |
spellingShingle |
Yong He Arlene M Correa Maria Gabriela Raso Wayne L Hofstetter Bingliang Fang Carmen Behrens Jack A Roth Yihong Zhou Liping Yu Ignacio I Wistuba Stephen G Swisher Apar Pataer The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer. PLoS ONE |
author_facet |
Yong He Arlene M Correa Maria Gabriela Raso Wayne L Hofstetter Bingliang Fang Carmen Behrens Jack A Roth Yihong Zhou Liping Yu Ignacio I Wistuba Stephen G Swisher Apar Pataer |
author_sort |
Yong He |
title |
The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer. |
title_short |
The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer. |
title_full |
The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer. |
title_fullStr |
The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer. |
title_full_unstemmed |
The role of PKR/eIF2α signaling pathway in prognosis of non-small cell lung cancer. |
title_sort |
role of pkr/eif2α signaling pathway in prognosis of non-small cell lung cancer. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS ONE |
issn |
1932-6203 |
publishDate |
2011-01-01 |
description |
In this study, we investigated whether PKR protein expression is correlated with mRNA levels and also evaluated molecular biomarkers that are associated with PKR, such as phosphorylated PKR (p-PKR) and phosphorylated eIF2α (p-eIF2α).We determined the levels of PKR protein expression and mRNA in 36 fresh primary lung tumor tissues by using Western blot analysis and real-time reverse-transcriptase PCR (RT-PCR), respectively. We used tissue microarrays for immunohistochemical evaluation of the expression of p-PKR and p-eIF2α proteins. We demonstrated that PKR mRNA levels are significantly correlated with PKR protein levels (Spearman's rho = 0.55, p<0.001), suggesting that PKR protein levels in tumor samples are regulated by PKR mRNA. We also observed that the patients with high p-PKR or p-eIF2α expression had a significantly longer median survival than those with little or no p-PKR or p-eIF2α expression (p = 0.03 and p = 0.032, respectively). We further evaluated the prognostic effect of combined expression of p-PKR plus PKR and p-eIF2α plus PKR and found that both combinations were strong independent prognostic markers for overall patient survival on stage I and all stage patients.Our findings suggest that PKR protein expression may controlled by transcription level. Combined expression levels of PKR and p-PKR or p-eIF2α can be new markers for predicting the prognosis of patients with NSCLC. |
url |
http://europepmc.org/articles/PMC3213082?pdf=render |
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