Cao Y, Liu T, Yin ML, Zhang BY, Song HL. Role of CX3CR1 in repair of injured intestinal epithelial cells by bone marrow mesenchymal stem cells.
Shijie Huaren Xiaohua Zazhi 2015;
23:3670-3682. [DOI:
10.11569/wcjd.v23.i23.3670]
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Abstract
AIM: To investigate the role of chemokine receptor CX3CR1 in the repair of injured intestinal epithelial cells by bone marrow mesenchymal stem cells (BM-MSCs).
METHODS: BM-MSCs were cultured and identified in vitro. Caco-2 cells were exposed to tumor necrosis factor alpha (TNF-α) to establish a cell model of injured intestinal epithelium. Cells were divided into six groups: BM-MSCs, Caco-2 cells, Caco-2 cells treated with TNF-α, co-cultured BM-MSCs and Caco-2 cells, co-cultured BM-MSCs and Caco-2 cells treated with TNF-α, and co-cultured BM-MSCs and Caco-2 cells treated with anti-CX3CR1 and TNF-α. The expression of tight junction proteins and mRNAs in Caco-2 cells, and CX3CR1 protein and mRNA in BM-MSCs was detected by immunofluorescence, Western blot and RT-PCR.
RESULTS: We selected 100 ng/mL TNF-α for 48 h to establish the injured model, because the expression of zonula occluden 1(ZO-1) and Occludin was reduced significantly at this time point (P < 0.05). The protein and mRNA levels of ZO-1, Occludin and CX3CR1 had no significant changes when BM-MSCs were co-cultured with untreated Caco-2 cells, but increased when BM-MSCs were co-cultured with injured Caco-2 cells (P < 0.05). When CX3CR1 was blocked, the protein and mRNA levels of ZO-1 and Occludin decreased significantly.
CONCLUSION: CX3CR1 participates in the repair of injured intestinal epithelial cells by BM-MSCs.
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