Figure 6.
VSV and UV-HSV injection, but not poly(I:C) stimulation, leads to high-level production of type I IFN by cells located in the marginal zone of the spleen. (a) WT mice were VSV infected and after 9 h spleens were analyzed immunohistochemically with a polyclonal serum against type I IFN (pAb, top two panels) or with an IFN-α–specific mAb (mAb, bottom two panels). (b) A higher magnification of the marginal zone area of the bottom right panel in (a) stained with mAb is shown. (c) WT and IFNAR−/− mice were VSV, poly (I:C), or UV-HSV injected. After 9 h and 6 h after UV-HSV stimulation, spleens were analyzed immunohistochemically with a polyclonal serum against type I IFN. Sections in (a–c) were counterstained with hemalum (blue) to visualize lymph follicles. (d) In situ hybridization of IRF-7 mRNA (blue) was performed on paraffin sections of spleen from WT and IFNAR−/− mice prepared 9 h after VSV infection.