(c) 2010 American Institute of Physics. [doi: 10.1063/1.3512965]“
“Objective. In the present study, the role of macrophages and mast cells in mineral trioxide aggregate (MTA)-induced release of neutrophil chemotactic factor was investigated.

Study design. MTA suspension (50 mg/mL) was plated over inserts on macrophages or mast cells for 90 minutes. Untreated cells served as controls. Cells were washed and cultured for 90 minutes in RPMI without the stimuli. Macrophages and mast cell supernatants were SYN-117 cell line injected intraperitoneally (0.5 mL/cavity), and neutrophil

migration was assessed 6 hours later. In some experiments, cells were incubated for 30 minutes with dexamethasone (DEX, 10 mu M/well), BWA4C (BW, 100 mu M/well) or U75302 (U75, 10 mu M/well). The concentration GS-9973 supplier of Leukotriene B-4 (LTB4) in the cell-free supernatant from mast cells and macrophage

culture was measured by ELISA.

Results. Supernatants from MTA-stimulated macrophages and mast cells caused neutrophil migration. The release of neutrophil chemotactic factor by macrophages and mast cells was significantly inhibited by DEX, BW, or U75. Macrophages and mast cells expressed mRNA for interleukin-1 (IL-1)beta and macrophage inflammatory protein-2 (MIP-2) and the pretreatment of macrophages and mast cells with DEX, BW, or U75 significantly altered IL-1 beta and MIP-2 mRNA expression. LTB4 was detected in the MTA-stimulated macrophage supernatant but not mast cells.

Conclusions. MTA-induces the release of neutrophil chemotactic factor substances from macrophages and mast cells with participation of IL-1

beta, MIP-2, and LTB4. (Oral Surg Screening Library molecular weight Oral Med Oral Pathol Oral Radiol Endod 2010; 109: e135-e142)”
“The synthesized flame retardant 9,10-dihydro-9-oxa-10-phosphaphanthrene-10-oxide/vinyl methyl dimethoxysilane (DV) was used to modify multiwalled carbon nanotubes (MWNTs). The results of FTIR, (1)H-NMR, and TGA measurements show that DV has been covalently grafted onto the surfaces of MWNTs, and the MWNTs-g-DV is obtained successfully. Transmission electron microscopy images show that a core-shell nanostructure appears with MWNTs as the core and the DV thin layers as the shell, and the modified MWNTs with DV can achieve better dispersion than unmodified MWNTs in EVM matrix. Thermogravimetric analysis and cone calorimeter tests indicate that the thermal stability and flame retardant are improved for the presence of the MWNTs in EVM matrix. Moreover, the improvement is more evident for EVM/MWNTs-g-DV composite compared to unmodified MWNTs-based composite, which can be attributed to the better dispersion of the DV-modified MWNTs and to the chemical structure of the combustion residue. (C) 2010 Wiley Periodicals, Inc.