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pubmed-article:1424636pubmed:abstractTextSecretion of tumor necrosis factor (TNF) by equine mammary exudate macrophages (MEM phi) exposed to bacterial lipopolysaccharide (LPS) was dose-dependent and was maximal (216.5 +/- 51.9 U/ml) at 100 micrograms LPS/ml, the highest concentration tested. All concentrations of dexamethasone tested (10(-8) to 10(-4) M) significantly (P less than or equal to 0.05) inhibited TNF production by MEM phi when the agent was added 1 hour before LPS. Pretreatment with pentoxifylline at concentrations greater than 3 micrograms/ml also significantly (P less than or equal to 0.05) reduced secretion of TNF by MEM phi. The inhibitory effect of dexamethasone (10(-4) M) was observed when the agent was added to MEM phi from 30 minutes before until 4 hours after LPS. Pentoxifylline (100 micrograms/ml) significantly (P less than or equal to 0.05) suppressed TNF when added from 2 hours before until 2 hours after LPS; however, when pentoxifylline addition was delayed until 8 hours post-LPS, TNF production was enhanced. These apparent inhibitory effects of dexamethasone and pentoxifylline were not due to reduced macrophage viability or to interfering effects of the agents at the level of the TNF bioassay.lld:pubmed
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pubmed-article:1424636pubmed:authorpubmed-author:MackayR JRJlld:pubmed
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pubmed-article:1424636pubmed:pagination435-46lld:pubmed
pubmed-article:1424636pubmed:dateRevised2009-11-11lld:pubmed
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pubmed-article:1424636pubmed:articleTitleSecretion of tumor necrosis factor by endotoxin-treated equine mammary exudate macrophages: effect of dexamethasone and pentoxifylline.lld:pubmed
pubmed-article:1424636pubmed:affiliationDepartment of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610.lld:pubmed
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pubmed-article:1424636pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed