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IFN-γ induces IFN-α and IFN-β expressions in cultured rat intestinal mucosa microvascular endothelial cells.

Immunopharmacol Immunotoxicol. 2010 Dec;32(4):656-62. doi:10.3109/08923971003671090. Epub 2010 Mar 10
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摘要


Although researchers have recently begun to pay more attention to the immunological characteristics of microvascular endothelial cells (MVECs), there are no reports on whether activation of MVECs by interferon-γ (IFN-γ) exerts any influence on the expressions of IFN-α/β. In the present study, we examined the influence of IFN-γ on the expressions of IFN-α/β in rat intestinal mucous MVECs (RIMMVECs). Different concentrations of IFN-γ were used to stimulate cultured RIMMVECs in vitro, and the cells and cell supernatants were collected at different time intervals. The influence of IFN-γ on the expressions of IFN-α/β in the RIMMVECs was examined at the mRNA and protein levels by real-time quantitative PCR and enzyme-linked immunosorbent assay (ELISA), respectively. The results indicated that IFN-γ was able to activate RIMMVECs, thereby leading to upregulated expressions of IFN-α/β. The real-time quantitative PCR analyses indicated that the IFN-α/β mRNA expression levels in RIMMVECs achieved their peak values after stimulation with IFN-γ at 20 ng/mL for 6 h and were increased by 14.88- and 3.82-fold, respectively, when compared with the levels in negative control cells. The ELISA analyses revealed that the IFN-α/β protein expression levels achieved their peak values after stimulation with IFN-γ at 40 ng/mL. The expression of IFN-α protein achieved its peak value at 12 h, while the expression of IFN-β protein achieved its peak value after 6 h. The present results suggest that the expression and secretion of IFNs may participate in the immunologic barrier function of MVECs.

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