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2016 ; 9
(443
): ra86
Nephropedia Template TP
Piccinini AM
; Zuliani-Alvarez L
; Lim JM
; Midwood KS
Sci Signal
2016[Aug]; 9
(443
): ra86
PMID27577261
show ga
Macrophages exhibit a phenotypic plasticity that enables them to orchestrate
specific immune responses to distinct threats. The microbial product
lipopolysaccharide (LPS) and the extracellular matrix glycoprotein tenascin-C are
released during bacterial infection and tissue injury, respectively, and both
activate Toll-like receptor 4 (TLR4). We found that these two TLR4 ligands
stimulated distinct signaling pathways in macrophages, resulting in cells with
divergent phenotypes. Although macrophages activated by LPS or tenascin-C
displayed some common features, including activation of nuclear factor ?B and
mitogen-activated protein kinase signaling and cytokine synthesis, each ligand
stimulated the production of different subsets of cytokines and generated
different phosphoproteomic signatures. Moreover, tenascin-C promoted the
generation of macrophages that exhibited increased synthesis and phosphorylation
of extracellular matrix components, whereas LPS stimulated the production of
macrophages that exhibited an enhanced capacity to degrade the matrix. These data
reveal how the activation of one pattern recognition receptor by different
microenvironmental cues generates macrophage with distinct phenotypes.