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Ahn, Ki Bum; Jeon, Jun Ho; Baik, Jung Eun; Park, Ok-Jin; Kang, Seok-Seong; Yun, Cheol-Heui; Park, Jong-Hwan; Han, Seung Hyun
Microbes and infection, February 2014, 2014-Feb, 2014-02-00, 20140201, Letnik: 16, Številka: 2Journal Article
Gram-positive bacteria contain lipoteichoic acid (LTA) and peptidoglycan (PGN) layers, both of which are considered as major virulence factors associated with inflammation. Cyclooxygenase-2 (COX-2) plays an important role in the inflammation by generating prostaglandins at infections. Since LTA and PGN are thought to cooperate in the establishment of inflammation, we examined the ability of staphylococcal LTA (Sa.LTA) to induce COX-2 expression in the presence of muramyl dipeptide (MDP), which is the minimal structural unit of PGN required for inflammation, in macrophages. While MDP failed to induce COX-2 expression, Sa.LTA alone was sufficient to induce COX-2 production. Treatment with MDP enhanced Sa.LTA-induced COX-2 and prostaglandin E2 production. The cooperative effect between Sa.LTA and MDP was not observed in COX-2 expression by macrophages derived from Toll-like receptor 2 (TLR2)- or nucleotide-binding oligomerization domain 2 (NOD2)-deficient mice. In addition, MDP enhanced Sa.LTA-induced activation of the transcription factors NF-κB and CRE, which are known to modulate COX-2 gene transcription. Conclusively, these results suggest that MDP and Sa.LTA cooperatively induce inflammatory response by overproducing COX-2 through NOD2 and TLR2.
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Vir: Osebne bibliografije
in: SICRIS
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