The hemoglobin receptor protein of porphyromonas gingivalis inhibits receptor activator NF-kappaB ligand-induced osteoclastogenesis from bone marrow macrophages.

Infection and Immunity
Yuji FujimuraKoji Nakayama

Abstract

Extracellular proteinaceous factors of Porphyromonas gingivalis, a periodontal pathogen, that influence receptor activator of nuclear factor-kappaB (NF-kappaB) ligand (RANKL)-induced osteoclastogenesis from bone marrow macrophages were investigated. The culture supernatant of P. gingivalis had the ability to inhibit RANKL-induced in vitro osteoclastogenesis. A major protein of the culture supernatant, hemoglobin receptor protein (HbR), suppressed RANKL-induced osteoclastogenesis in a dose-dependent fashion. HbR markedly inhibited RANKL-induced osteoclastogenesis when present in the culture for the first 24 h after addition of RANKL, whereas no significant inhibition was observed when HbR was added after 24 h or later, implying that HbR might interfere with only the initial stage of RANKL-mediated differentiation. HbR tightly bound to bone marrow macrophages and had the ability to induce phosphorylation of ERK, p38, NF-kappaB, and Akt. RANKL-induced phosphorylation of ERK, p38, and NF-kappaB was not suppressed by HbR, but that of Akt was markedly suppressed. HbR inhibited RANKL-mediated induction of c-Fos and NFATc1. HbR could induce beta interferon (IFN-beta) from bone marrow macrophages, but the induction level of IFN-beta mig...Continue Reading

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Citations

Oct 7, 2004·Journal of Neuroimmunology·Bruno GranAbdolmohamad Rostami
Dec 2, 2017·Periodontology 2000·Brian Henderson, Frank Kaiser
Nov 8, 2017·Nihon saikingaku zasshi. Japanese journal of bacteriology·Koji Nakayama
Mar 7, 2019·Frontiers in Immunology·Sabine Groeger, Joerg Meyle
May 5, 2011·Microbial Pathogenesis·Nina ScheresVincent Everts

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