Tumor necrosis factor (TNFalpha) production by rat peritoneal macrophages is not polyacrylate surface-chemistry dependent.
Polyacrylate films in the absence of added endotoxin caused rat peritoneal macrophages to secrete a small amount of TNFalpha. There was little difference, if any, among the materials, which included various co- or ter-polymers of hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, methacrylic acid, methyl methacrylate, and butyl methacrylate. The materials were surface characterized and endotoxin cleaned prior to testing. Equivalent endotoxin levels associated with the material were <0.03 EU/mL for all materials but two; for polyHEMA, the most contaminated material, it was 0.23 EU/mL. Films of the materials were incubated with freshly isolated rat peritoneal macrophages for 6 to 24 h before the TNFalpha levels in the supernatant were analyzed for biological activity, using L929 cells as a target. When endotoxin was added, far greater quantities of TNFalpha were generated at 24 h compared to 6 h, but still there was little effect with regard to material chemistry. Such an in vitro assay proved not to be useful for the screening of potential microencapsulation materials for peritoneal biocompatibility.
Ung
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Department of Chemical Engineering and Applied Chemistry and Institute of Biomaterials and Biomedical Engineering, University of Toronto, 200 College Street, Toronto, Ontario, Canada M5S 3E5.
Woodhouse
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KA
Sefton
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MV
D000818:Animals; D004731:Endotoxins / Q000494:pharmacology; D005240:Feasibility Studies; D017737:Macrophages, Peritoneal / Q000378:metabolism*; D008297:Male; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D020366:Methylmethacrylate / Q000737:chemistry*; D019736:Prostheses and Implants; D051381:Rats; D017208:Rats, Wistar; D013499:Surface Properties; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis*
D004731:Endotoxins; D008689:Methacrylates; D014409:Tumor Necrosis Factor-alpha; D020366:Methylmethacrylate; C005044:hydroxyethyl methacrylate