In vitro cytokine modulation of cadherin-1 protein expression levels. Thioglycollate-elicited peritoneal macrophages were incubated in vitro for 48 hours in the presence of IL-4 or in the absence of cytokines (NT indicates no treatment control). Cadherin-1 surface (A) and intracellular (B) expression were determined and are represented as described in the legend to Figure 2. *Significantly higher compared with no treatment (P < .05). Solid and dashed lines are as in Figure 2.