Toll-like receptor-induced innate immune responses in non-parenchymal liver cells are cell type-specific.

Immunology
Jun WuJoerg F Schlaak

Abstract

Little is known of how the Toll-like receptor (TLR) system can modulate the function of non-parenchymal liver cells (NPC) as a major component of the innate and adaptive immune system of the liver. To investigate the diversification of TLR signalling pathways in NPC, we isolated Kupffer cells (KC) and liver sinusoidal endothelial cells (LSEC) from wild-type C57BL/6 mice and examined their responses to TLR1 to TLR9 agonists. The data show that KC respond to all TLR ligands by producing tumour necrosis factor-alpha (TNF-alpha) or interleukin-6 (IL-6), to TLR3 and TLR4 ligands only by producing interferon-beta (IFN-beta), to TLR1 and TLR8 ligands by significantly up-regulating major histocompatibility complex (MHC) class II and costimulatory molecules, and to TLR1, -2, -4 and -6 ligands by inducing high levels of T-cell proliferation and IFN-gamma production in the mixed lymphocyte reaction (MLR). Similarly, LSEC respond to TLR1 to -4, -6, -8 and -9 ligands by producing TNF-alpha, to TLR3 and -4 ligands by producing IL-6, and to TLR3 ligands by producing IFN-beta. Interestingly, despite significant up-regulation of MHC class II and co-stimulatory molecules in response to TLR8 ligands, LSEC stimulated by TLR1, -2 or -6 could stimul...Continue Reading

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