Zymosan induces nitric oxide production by peritoneal mesothelial cells

V. Yao, Rosalie Mccauley, D. Cooper, Cameron Platell, John Hall

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Introduction: The production of nitric oxide is an important peritoneal defense mechanism. We have evaluated the effect of various putative stimulants on nitric oxide production by peritoneal mesothelial cells.Methods: Wistar rats were randomized to either a control group or a peritonitis group (5 mg zymosan intraperitoneally). Groups of five animals were sacrificed at 4, 18, 24, 48 and 96 h after the induction of peritonitis and their peritoneal fluid was harvested for assay. Cultures of peritoneal mesothelial cells were stimulated with lipopolysaccharide, myeloperoxidase, TNFalpha, zymosan, peritoneal fluid from a control animal and peritoneal fluid from a peritonitis animal. Supernatants were collected after incubation for 4, 24 and 48 h for assay. The assay for nitric oxide was based upon the nitrite content of the samples.Results: The intraperitoneal administration of zymosan was associated with an increased production of nitric oxide (NO) when compared with control animals (P < 0.01). In cultures of peritoneal mesothelial cells, zymosan, but not the other putative stimulants, was associated with a marked output of nitric oxide (P < 0.001).Conclusion: Zymosan has a direct effect on peritoneal mesothelial cells, which are able to generate nitric oxide in the absence of co-stimulatory molecules. This suggests that it may be possible to use some form of external stimulation to up-regulate the NO response by peritoneal mesothelial cells.
Original languageEnglish
Pages (from-to)266-9
JournalANZ Journal of Surgery
Issue number4
Publication statusPublished - 2004


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