Loss of BMI-1 dampens migration and EMT of colorectal cancer in inflammatory microenvironment through TLR4/MD-2/MyD88-mediated NF-κB signaling.

Abstract:

:Increasing evidence from various clinical and experimental studies has demonstrated that the inflammatory microenvironment created by immune cells facilitates tumor migration. Epithelial-mesenchymal transition (EMT) is involved in the progression of cancer invasion and metastasis in an inflammatory microenvironment. B-lymphoma Moloney murine leukemia virus insertion region 1 (BMI-1) acts as an oncogene in various tumors. Ectopic expression of Bmi-1 have an effect on EMT and invasiveness. The purpose of this study was to investigate the efficacy of BMI-1 on inflammation-induced tumor migration and EMT and the underlying mechanism. We observed that the expression of BMI-1, TNF-α, and IL-1β was significantly increased in HT29 and HCT116 cells after THP-1 Conditioned-Medium (THP-1-CM) stimulation. Additionally, inhibition of BMI-1 impeded cell invasion induced by THP-1-CM-stimulation in both HT29 and HCT116 cells. BMI-1 knockdown remarkably repressed THP-1-CM-induced EMT by regulating the expression of EMT biomarkers with an increase in E-cadherin accompanied by decrease in N-cadherin and vimentin. Furthermore, downregulation of BMI-1 dramatically impeded THP-1-CM-triggered Toll-like receptor 4(TLR4)/myeloid differentiation protein 2(MD-2)/myeloid differentiation factor 88(MyD88) activity by repressing the expression of the TLR4/MD-2 complex and MyD88. Further data demonstrated that knockout of BMI-1 also dampened NF-κB THP-1-CM-triggered activity. Taken all data together, our findings established that BMI-1 modulated TLR4/MD-2/MyD88 complex-mediated NF-κB signaling involved in inflammation-induced cancer cells invasion and EMT, and therefore, could be a potential chemopreventive agent against inflammation-associated colorectal cancer. HIGHLIGHTS:Establishment of an inflammatory microenvironment. Suppression of BMI-1 reverses THP-1-CM-induced inflammatory cytokine production in CRC. Loss of BMI-1 suppressed TLR4/MD-2/MyD88 complex-mediated NF-κB signaling.

journal_name

J Cell Biochem

authors

Ye K,Chen QW,Sun YF,Lin JA,Xu JH

doi

10.1002/jcb.26353

subject

Has Abstract

pub_date

2018-02-01 00:00:00

pages

1922-1930

issue

2

eissn

0730-2312

issn

1097-4644

journal_volume

119

pub_type

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