Abstract:
:Toll-like receptor (TLR) 9 plays a role in intestinal inflammation that, in turn, is related to the tumorigenesis of colorectal cancer. Nuclear factor κB (NFκB), and interferon regulatory factor (IRF) 5 and IRF7 can be activated by TLR9 and induce the production of proinflammatory cytokines and type I interferon, respectively. This study investigated the mRNA expressions of TLR9 and its downstream signaling molecules in both the tumor and the normal tissues of colorectal cancer. Eighty-four subjects with colorectal cancer were consecutively recruited at a community-based hospital, and the mRNA expression of TLR9, NFκB, IRF5, IRF7, interleukin 6 (IL6), and interferon α/β/ω receptor 1 (IFNAR1) in the tumor and normal tissue were determined by real-time reverse transcription polymerase chain reaction using TaqMan FAM-labeled MGB probes (Life Technologies, Carlsbad, CA). The tumor had higher percentages of detection of TLR9, IFNAR1, and IL6 mRNA expressions than normal tissue. The absence of detectable TLR9 mRNA expression was associated with an absence of significance in the correlation between IL6 and NFκB or IRF5, but not that between IRF7 and IFNAR1 in both the tumor and the normal tissues. An absence of detectable IFNAR1 mRNA expression in the tumor (hazard ratio: 3.77; 95% confidence interval: 1.22-11.60) and advanced stage (stages III and IV, 7.86; 1.76-35.40) were significant predictors for overall survival. IFNAR1 is a predictor for overall survival and mRNA expression is correlated to IRF7, but not TLR9 in colorectal cancer. The results cast doubt on the usefulness of TLR9 agonist in treating colorectal cancer.
journal_name
Medicine (Baltimore)journal_title
Medicineauthors
Chang LC,Fan CW,Tseng WK,Chein HP,Hsieh TY,Chen JR,Hwang CC,Hua CCdoi
10.1097/MD.0000000000000349subject
Has Abstractpub_date
2014-12-01 00:00:00pages
e349issue
29eissn
0025-7974issn
1536-5964pii
00005792-201412040-00034journal_volume
93pub_type
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