... K, Tagawa Y, Iwakura Y, KayagakiN, Kurimoto M, Okamura H, Hada T, Yagita H, Akira S, NakanishiK, Higashino K: IL-18 up-regulates perforin-mediated NK activ-ity without increasing perforin messenger ... expression of IL-18 by CD68+ macrophages wasobserved only within periductal inflammatory foci and in periacinar macrophages adjacent to focal infiltrates, andnot in isolated macrophages, an observation ... at somelevel was detected in all SS patients studied, but interest-ingly only in a minority of patients with chronic sialoadenitis.No staining for IL-18 was found in acinar cells, indicatingthat...