The Notch signaling pathway is involved in the up-regulation of CXCR4 induced by IL-1β.

<p>(A) Time-dependent activation of Notch by IL-1β. Tca8113 cells were treated with 20 ng/ml IL-1β for the indicated time periods. Activated Notch NCID fragments were detected by western blot. β-actin protein levels were measured as loading controls. (B) Dose dependent activation of Notch by IL-1β treatment for 1 h. (C) The effect of IL-1β on Hes1 mRNA levels. Tca8113 cells were treated with 20 ng/ml IL-1β for the indicated time periods. The mRNA levels of the Notch1 targeting gene Hes1 were measured by qRT-PCR. * <i>P</i> < 0.05 compared with the control group. (D) The effect of Notch inhibition on CXCR4 expression induced by IL-1β. Tca8113 cells, pre-treated with the indicated concentrations of Notch inhibitor L685458 for 30 min, were treated with 20 ng/ml IL-1β for 1 h. The mRNA levels of CXCR4 were measured by RT-PCR. β-actin mRNA levels were measured as loading controls. (E) Quantitative data of CXCR4 expression in (D). * <i>P</i> < 0.05 compared with IL-1β-treated alone group. (F) The effect of Notch inhibition on IL-1β expression induced by IL-1β. Cells were treated as described in (D). The mRNA levels of IL-1β were measured by RT-PCR. β-actin mRNA levels were measured as loading controls. (G) Quantitative data of IL-1β expression in (F). * <i>P</i> < 0.05 compared with the IL-1β-treated alone group. (H) The effect of Notch inhibition on long-term CXCR4 mRNA expression induced by IL-1β. Tca8113 cells, pre-treated with the indicated concentrations of Notch inhibitor L685458 for 30 min, were treated with 20 ng/ml IL-1β for 24 h. The mRNA levels of CXCR4 were measured by RT-PCR. β-actin mRNA levels were measured as loading controls. (I) The effect of Notch inhibition on CXCR4 protein expression induced by IL-1β. Tca8113 cells, pre-treated with the indicated concentrations of the Notch inhibitor L685458 for 30 min, were treated with 20 ng/ml IL-1β for 24 h. The protein levels of CXCR4 were measured by western blot. β-actin protein levels were measured as loading controls.