Failure modes were

observed by SEM, and loading induced stress distribution was simulated and analyzed by finite element analysis. Statistical data analysis was performed using Kruskal-Wallis, one-way ANOVA, and paired test at a significance ACY-738 mw level of 0.05. Results: As the grits size of SiC increased, LDG surface roughness decreased from group A to D (p smaller than 0.001), which remained unchanged after veneer firing. No difference in sigma(f) (p = 0.41 for subgroups At-Dt; p = 0.11 for subgroups Ac-Dc), m values as well as failure modes was found among four subgroups for both loading schemes. Specimens in subgroup t showed higher sigma(f) (p smaller than 0.001) and m values than subgroup c. Stress distribution between loading schemes did not differ from each other. Cracks, as the dominant failure mode initiated from bottom tensile surface. No sign of interfacial cracking or delamination was observed for all groups. Conclusions: Technician grinding changed surface topography of LDG ceramic material, but was not detrimental to the bilayered system strength after veneer application. LDG bilayered system was more sensitive

to fracture when loaded with veneer porcelain in tension. Clinical significance: Within the limitations of the simulated grinding applied, it is concluded that veneer porcelain can be applied directly after technician grinding of LDG ceramic as it has no detrimental effect on the strength of bilayered structures. The connector areas of LDG fixed dental prosthesis are more sensitive to fracture GM6001 mouse compared with single crowns, and should be fabricated with more caution. (C) 2014 Elsevier Ltd. All rights reserved.”
“Activation of AMP-activated protein kinase (AMPK) inhibits hepatic fatty acid synthesis by suppressing sterol regulatory element-binding protein (SREBP)-1c, selleck inhibitor a master regulator of hepatic lipogenic gene expression. Using a model cell line rat hepatoma McA-RH7777 (CRL-1601)

that mimics the behavior of the intact liver by producing high levels of SREPB-1c mRNA and protein, we previously showed that AMPK suppresses hepatic Srebp-1c transcription by inhibiting endogenous liver X receptor (LXR) ligand production and SREBP-1c processing. However, whether AMPK directly inhibits ligand-induced LXR activity remained undetermined. In this study we used a series of mutant Srebp-1c promoter linked to a luciferase reporter to determine the inhibitory mechanism in rat hepatoma McA-RH7777 cells. AMPK activation by either AICAR or metformin decreases Srebp-1c promoter activity by about 75%. Normally, the synthetic LXR ligand T0901317 compound increases the wild-type Srebp-1c promoter activity by about 3-fold, which is similar to that observed in the presence of AICAR or metformin. When endogenous LXR ligand production was blocked by the potent HMG CoA reductase inhibitor compactin, T0901317-induced Srebp-1c promoter activity was decreased by AICAR or metformin treatment.