Research Article

IL-6 Negatively Regulates IL-22Rα Expression on Epidermal Keratinocytes: Implications for Irritant Contact Dermatitis

Figure 3

IL-6 negatively regulates IL-22Rα expression on epidermal keratinocytes. Primary keratinocytes from IL-6KO mice were treated with rmIL-6 for 4/24 hours (mRNA/protein expression) at the indicated concentrations. The expression of IL-22Rα mRNA was analyzed and normalized to 28S ribosomal RNA as control (a). IL-6KO keratinocytes were grown to confluency on multichamber slides. Immunohistochemical analysis of keratinocyte culture stained for the expression of IL-22Rα (green), and nuclear staining DAPI (blue). Representative fluorescent images are shown at 20x (b–e) and 40x (f–i). Quantification of IL-22Rα expression as determined by ImageJ (NIH) is presented (j and k). Data are . Significantly different from 0 ng/ml rmIL-6 (, separate experiments).