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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
7
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pubmed:dateCreated |
1990-4-30
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pubmed:abstractText |
Recent studies show the importance of a single amino acid, L-arginine, as a necessary substrate for activated macrophage-mediated cytotoxic activity for tumor target cells and microbiostatic function for Cryptococcus neoformans. The present studies were carried out to determine the role of the L-arginine-dependent macrophage effector function on the microbiostatic effects of activated macrophages on the obligate intracellular protozoan, Toxoplasma gondii. A guanidino methylated derivative of L-arginine, NGmonomethyl-L-arginine (NGMMA), a competitive inhibitor of the L-arginine-dependent effector pathway, virtually abolished the normally potent microbiostatic effect of macrophages for Toxoplasma gondii after activation of the macrophages in vitro by IFN-gamma and LPS or in vivo by i.p. injection of killed Corynebacterium parvum. Addition of supplemental L-arginine to the culture medium overcame the capacity of NGMMA to block activated macrophage-mediated microbiostasis of Toxoplasma. The ability of NGMMA to inhibit the microbiostatic capacity of activated macrophages for Toxoplasma gondii correlated with almost total inhibition of synthesis of nitrite, nitrate, and L-citrulline from L-arginine. Therefore, as is the case for tumor target cells and C. neoformans, the synthesis of inorganic nitrogen oxides from a terminal guanidino nitrogen atom of L-arginine appears to be essential for murine cytotoxic activated macrophage mediated microbiostatic capacity for T. gondii.
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pubmed:grant | |
pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
AIM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Arginine,
http://linkedlifedata.com/resource/pubmed/chemical/Citrulline,
http://linkedlifedata.com/resource/pubmed/chemical/Nitrates,
http://linkedlifedata.com/resource/pubmed/chemical/Nitrites,
http://linkedlifedata.com/resource/pubmed/chemical/Nitrogen Oxides,
http://linkedlifedata.com/resource/pubmed/chemical/omega-N-Methylarginine
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pubmed:status |
MEDLINE
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pubmed:month |
Apr
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pubmed:issn |
0022-1767
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:day |
1
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pubmed:volume |
144
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
2725-9
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pubmed:dateRevised |
2007-11-14
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pubmed:meshHeading |
pubmed-meshheading:2319133-Animals,
pubmed-meshheading:2319133-Arginine,
pubmed-meshheading:2319133-Citrulline,
pubmed-meshheading:2319133-Macrophage Activation,
pubmed-meshheading:2319133-Macrophages,
pubmed-meshheading:2319133-Mice,
pubmed-meshheading:2319133-Mice, Inbred BALB C,
pubmed-meshheading:2319133-Nitrates,
pubmed-meshheading:2319133-Nitrites,
pubmed-meshheading:2319133-Nitrogen Oxides,
pubmed-meshheading:2319133-Toxoplasma,
pubmed-meshheading:2319133-omega-N-Methylarginine
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pubmed:year |
1990
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pubmed:articleTitle |
Microbiostatic effect of murine-activated macrophages for Toxoplasma gondii. Role for synthesis of inorganic nitrogen oxides from L-arginine.
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pubmed:affiliation |
Immunology Research Department, Gillis W. Long Hansen's Disease Center, Carville, LA 70721.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.,
Research Support, U.S. Gov't, Non-P.H.S.
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