TITLE:
Maleylated-BSA induces TNF-α production through the ERK and NF-κB signaling pathways in murine RAW264.7 macrophages
AUTHORS:
Rui Tada, Yusuke Koide, Mitsuaki Yamamuro, Akira Hidaka, Koichiro Nagao, Yoichi Negishi, Yukihiko Aramaki
KEYWORDS:
Maleylated-BSA; ERK; Macrophages; Signaling Pathway; TNF-α
JOURNAL NAME:
Open Journal of Immunology,
Vol.3 No.4,
December
11,
2013
ABSTRACT: Ligands for macrophage scavenger receptors are reported to induce a wide range of host cell responses, including the production of inflammatory cytokines; however, the underlying mechanisms have not yet been fully understood and which remain obscure. In this study, we have examined the effect of maleylated bovine serum albumin (maleylated-BSA), a well-known ligand of the scavenger receptor, on the murine macrophage cell line RAW264.7. Maleylated-BSA strongly induced the production of tumor necrosis factor-α (TNF-α) and induced phosphorylation of extracellular signal-regulated kinase (ERK) and NF-kB p65. We also observed that maleylated-BSA-induced TNF-α production was blocked by the ERK inhibitor U0126. Together, these data demonstrates that maleylated-BSA- induced production of TNF-α requires the ERK/NF-κB signaling cascade in murine RAW- 264.7 macrophages.