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• W2017965412 abstract "Background/aim: Human osteoblasts induced by inflammatory stimuli express an inducible nitric oxide synthase (iNOS). The aim of the present study was to test the hypothesis that Aggregatibacter actinomycetemcomitans lipopolysaccharide stimulates the production of nitric oxide (NO) by a human osteoblast‐like cell line (HOS cells). Methods: Cells were stimulated directly with A. actinomycetemcomitans lipopolysaccharide or pretreated with the following l ‐NIL (an iNOS inhibitor), anti‐CD14, Toll‐like receptor 2 (TLR2), or TLR4 antibody before stimulation with A. actinomycetemcomitans lipopolysaccharide. The role of the cyclic nucleotides was assessed by pretreating the cells with the following; ODQ (a guanylyl cyclase inhibitor); SQ22536 (an adenylyl cyclase inhibitor); db‐cAMP (a cyclic adenosine monophosphate analog); br‐cGMP (a cyclic guanosine monophosphate analog); forskolin (an adenylyl cyclase activator), IBMX [a non‐specific phosphodiesterase (PDE) inhibitor], or KT5720 [a protein kinase A (PKA) inhibitor]. The cells were also preincubated with genistein [a protein tyrosine kinase (PTK) inhibitor], bisindolylmaleimide [a protein kinase C (PKC) inhibitor], BPB [a phospholipase A2 (PLA2) inhibitor], and NDGA (a lipoxygenase inhibitor). The iNOS activity and nitrite production in the cell cultures were determined spectrophotometrically. Results: The results showed that A. actinomycetemcomitans lipopolysaccharide stimulated both iNOS activity and nitrite production by HOS cells; this was reduced by l ‐NIL, anti‐CD14, or anti‐TLR4 antibody, SQ22536, KT5720, genistein, bisindolylmaleimde, BPB, and NDGA, but was enhanced by db‐cAMP, IBMX, and forskolin. Conclusion: These results therefore suggest that A. actinomycetemcomitans lipopolysaccharide may induce the production of NO by HOS cells via a CD14–TLR4 molecule complex, a cAMP–PKA pathway, as well as by a PTK, PKC, PLA2, and lipoxygenase‐dependent mechanism." @default.
• W2017965412 created "2016-06-24" @default.
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• W2017965412 date "2008-12-12" @default.
• W2017965412 modified "2023-10-12" @default.
• W2017965412 title "Nitric oxide production by a human osteoblast cell line stimulated with<i>Aggregatibacter actinomycetemcomitans</i>lipopolysaccharide" @default.
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• W2017965412 doi "https://doi.org/10.1111/j.1399-302x.2008.00475.x" @default.
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