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Innate Immunity
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A polymer-type water-soluble peptidoglycan exhibited both Toll-like receptor 2- and NOD2-agonistic activities, resulting in synergistic activation of human monocytic cells

Mizuho Natsuka

Department of Microbiology and Immunology, Tohoku University School of Dentistry, Aoba-ku, Sendai, Japan, Department of Oral Surgery, Tohoku University School of Dentistry, Aoba-ku, Sendai, Japan

Akiko Uehara

Department of Microbiology and Immunology, Tohoku University School of Dentistry, Aoba-ku, Sendai, Japan, kyoro{at}mail.tains.tohoku.ac.jp, dent-ht{at}mail.tains.tohoku.ac.jp

Shuhua Yang

Department of Microbiology and Immunology, Tohoku University School of Dentistry, Aoba-ku, Sendai, Japan

Seishi Echigo

Department of Oral Surgery, Tohoku University School of Dentistry, Aoba-ku, Sendai, Japan

Haruhiko Takada

Department of Microbiology and Immunology, Tohoku University School of Dentistry, Aoba-ku, Sendai, Japan

Bacterial peptidoglycan (PGN) has been reported to be sensed by cell-surface Toll-like receptor (TLR)2. On the other hand, intracellular NOD-like receptors recognize PGN partial structures: NOD1 and NOD2 recognize the peptide moiety containing diaminopimelic acid, and the muramyldipeptide (MDP) moiety, respectively. In this study, we examined in human monocytic THP-1 cells the pro-inflammatory cytokine-inducing abilities of PGNs and their fragments enzymatically prepared from Staphylococcus epidermidis ATCC 155: a polymer-type water-soluble PGN possessing an intact glycan chain (SEPS) and a monomer-type PGN (SEPS-M). The water-soluble PGN polymer, SEPS, exhibited considerably stronger activities to induce pro-inflammatory cytokines than parent PGNs and the PGN monomer, SEPS-M. Short interference RNA targeting TLR2 and NOD2 markedly reduced the activities of SEPS. In the same experiments, the activities of PGNs were mainly reduced in TLR2-silenced cells, whereas the activities of SEPS-M as well as a synthetic MDP were markedly reduced in NOD2-silenced cells. Furthermore, the PGNs and a reference PGN from Staphylococcus aureus in combination with MDP synergistically induced interleukin-8 in THP-1 cells. These findings strongly suggested that a polymer-type water-soluble PGN fragment, SEPS, exhibits both TLR2-and NOD2-agonistic activities, which induced the synergistic activation of human monocytic cells.

Key Words: Peptidoglycans • Toll-like receptor (TLR)2 • NOD2 • human monocytic cells • muramyldipeptide (MDP)

Innate Immunity, Vol. 14, No. 5, 298-308 (2008)
DOI: 10.1177/1753425908096518
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