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In‐vitro susceptibility of hydatid cysts of Echinococcus granulosus to nitric oxide and the effect of the laminated layer on nitric oxide production
Author(s) -
Steers N.J.R.,
Rogan M.T.,
Heath S.
Publication year - 2001
Publication title -
parasite immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 75
eISSN - 1365-3024
pISSN - 0141-9838
DOI - 10.1046/j.1365-3024.2001.00385.x
Subject(s) - nitric oxide , echinococcus granulosus , in vitro , biology , phagocytosis , macrophage , immunology , nitric oxide synthase , in vivo , interferon gamma , pathology , microbiology and biotechnology , biochemistry , medicine , endocrinology , zoology
Murine hydatid cysts of Echinococcus granulosus were incubated in vitro in the presence of nitric oxide produced from S ‐nitroso‐ N ‐acetylpenicillamine (SNAP) or interferon‐γ activated peritoneal macrophages. In both situations, evidence of cyst damage and death was observed by microscopy in over 77% of cysts after 3 days, indicating that intact hydatid cysts could be susceptible to a Th1 driven macrophage attack. A crude extract of the laminated layer from cysts was found to be able to reduce the production of nitric oxide from activated macrophages in vitro and in vivo and this may have been due to phagocytosis of laminated layer fragments by the macrophages. The results indicate that, although cysts may be susceptible to the effects of nitric oxide, the laminated layer may be involved in downregulating nitric oxide production.