These data indicate that unstimulated milky spots in the human greater omentum are to a great extent just a preformed specific accumulation of primarily macrophages within the stroma of the greater omentum, and therefore, cannot be regarded as true secondary lymphoid tissue. Milky spots could serve as a gateway for, as well as a provider of peritoneal macrophages when the intra-abdominal status so requires. Finally, the data from this study are compared with the data of other studies of human milky spots and those in animals.

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Mesothelial cells (MC) are able to produce interleukin-8 (IL-8) after stimulation with IL-1␤ or tumor necrosis factor alpha. The aim of our study was to investigate whether MC are able to produce IL-8 after direct stimulation with clinically relevant bacteria. We observed a significant IL-8 response by the MC which were directly stimulated with viable staphylococci.

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