Abstract
Objective
Currently, little is known regarding the role of peroxisome proliferator-activated receptor-β (PPAR β) in the vascular endothelial cells (VECs) of colorectal cancers (CRCs). The aim of this study was to investigate the relationship of PPAR β expression in the VECs of CRCs in terms of the prognosis and clinicopathological features of CRC patients.
Design
The expression and localization of PPAR β in the primary cancers and the matched normal mucosal samples of 141 Swedish CRC patients were analyzed in terms of its correlation with clinicopathological features and the expression of angiogenesis-related genes. This study also included 92 Chinese CRC patients.
Results
PPAR β was predominantly localized in the cytoplasm and was significantly downregulated in the VECs of CRC compared to that of the normal mucosa. The low expression levels of PPAR β in the VECs of CRC were statistically correlated with enhanced differentiation, early staging and favorable overall survival and were associated with the increased expression of VEGF and D2-40. The patients exhibiting elevated expression of PPAR β in CRC cells but reduced expression in VECs exhibited more favorable survival compared with the other patients, whereas the patients with reduced expression of PPAR β in CRC cells but increased expression in VECs exhibited less favorable prognosis.
Conclusions
PPAR β might play a tumor suppressor role in CRC cells in contrast to a tumor promoter role in the VECs of CRCs.
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Acknowledgments
This study was supported by grants from the Natural Science Foundation of China (Grant No. 30801332), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 200806100058), the Foundation for the Author of National Excellent Doctoral Dissertation of PR China (No. 2007B66), and the Swedish Cancer Foundation, Swedish Research Council and the Health Research Council in the South-East of Sweden.
Conflict of interest
Jin Zhou, Lie Yang, Yuan Li, Gunnar Arbman, Ke-Ling Chen, Bin Zhou, Yong-Yang Yu, Cun Wang, Xian-Ming Mo, You Lu, Zong-Guang Zhou and Xiao-Feng Sun declare no conflicts of interest relevant to this manuscript.
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J. Zhou and L. Yang contributed equally to this study.
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Zhou, J., Yang, L., Li, Y. et al. The prognostic significance of peroxisome proliferator-activated receptor β expression in the vascular endothelial cells of colorectal cancer. J Gastroenterol 49, 436–445 (2014). https://doi.org/10.1007/s00535-013-0845-7
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DOI: https://doi.org/10.1007/s00535-013-0845-7