Abstract
Nonparenchymal liver cells from untreated C3HeB/FeJ mice, when incubated in medium containing-10% fetal bovine serum or portal serum, produced significant amounts of interferon alpha/beta (IFNα/β). In contrast, other cell populations (spleen, mononuclear blood cells and peritoneal cells) from C3HeB/FeJ mice or nonparenchymal liver cells from other strains of mice (C3H/HeJ, germ-free C3H/HeN and C57Bl/6J) produced little or no detectable IFN in fetal bovine serum under the same culture conditions. The cells in the nonparenchymal liver cell population responsible for IFNα/β production were adherent, phagocytic, silica-sensitive, carbonyl-iron-sensitive, and Thy1.2−, presumably Kupffer cells or resident liver macrophages. IFNα/β production by cultured Kupffer cells was not observed if medium containing fetal bovine serum or portal serum was treated with polymyxin B or if Kupffer cells were cultured in serum-free medium. This suggested that small amounts of endotoxin in fetal bovine or portal serum stimulated Kupffer cells to produce IFNα/β. Possibly, Kupffer cells are in a different state of activation/maturation than peritoneal and splenic macrophages since the sensitivity of resident Kupffer cells from C3HeB/FeJ mice to the stimulatory effects of endotoxin. The endogenous production of IFNα/β by Kupffer cells from C3HeB/FeJ mice can augment liver-associated natural killer (NK) activity against YAC-1 cells (4 h) and induce liver-associated cytotoxic activity, not restricted by the major histocompatibility complex, against NK resistant P815 mastocytoma cells (18 h).
Keywords: Natural Killer, Kupffer Cell, Polymyxin, Natural Killing Activity, Portal Serum
Footnotes
This work was supported by National Institutes of Health grant CA28835, VA Merit Grant and by the Margaret Duffy and Robert Cameron Troup Fund
Abbreviations used: NPC, nonparenchymal liver cells; FBS, fetal bovine serum; IFN, interferon; α-AsGm-1, anti-asialo-GM1; α-Thy1.2, anti-Thy1.2; Hepes, 4-(2-hydroxyethyl)1-piperazineethanesulfonic acid; HBSS, Hanks' balanced salt solution; GBSS, Gey's balanced salt solution; SRBC, sheep red blood cells; Ab, mouse anti-SRBC; NK, natural killer; MHC, major histocompatibility complex; polyI·polyC, polyinosinec·polycytidylic acid
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