Fig. 7

Expression of the phosphorylated erythropoietin receptor decreases 2 days following LPS exposure. An acute increase of the area fraction (%) of pEPOR immunoreactivity (IR) was observed at 5 h after LPS exposure in the white matter (SAL vs 5 h p = 0.010) and cortex (SAL vs 5 h p = 0.100) compared to controls (c, e). At 2 days after LPS exposure, there is a significant decrease in pEPOR IR within all brain regions compared to controls: white matter (SAL vs 2 days LPS p = 0.030) (c), hippocampus (SAL vs 2 days LPS p = 0.088) (d), and cortex (SAL vs 2 days LPS p = 0.010) (e). At 4 and 8 days following LPS exposure, pEPOR expression is still decreased compared to controls in the white matter (SAL vs 4 days LPS p = 0.100), hippocampus (SAL vs 4 days LPS 0.045; SAL vs 8 days LPS p = 0.014), and cortex (SAL vs 4 days LPS 0.020.; SAL vs 8 days LPS p = 0.030). When the fetus had been exposed to 15 days of LPS, there was no decrease in pEPOR IR (c–e). Representative histological figures of the pEPOR in the white matter (a) and hippocampus (b) are depicted in control animals (SAL) and animals exposed to LPS for 5 h, 2 days, and 15 days. Images taken at × 100 magnification (insert at × 400 magnification), scale bar = 200 μm. Asterisk indicated p < 0.05 versus controls (SAL), number sign indicated 0.05 < p < 0.1 versus controls (SAL)