The aim of this study was to investigate the effect of perifosine, a nontoxic AKT inhibitor, as a single agent on NB cell growth in vitro and in vivo.\n\nFour human NB cell lines (AS, NGP, BE2, and KCNR) were treated with increasing concentrations of perifosine, and a quantitative analysis of cell death (apoptosis) was performed by using MTS and caspase-3/7 activity assays. Survival of mice carrying xenograft NB tumors that were treated with perifosine (n = 6-7 mice per group) was compared with that of untreated mice (n = 7 mice per
group) using Kaplan-Meier analysis. Tumor volumes were calculated to determine the effect of perifosine on NB tumor growth. Phosphorylation of AKT and expression of cleaved caspase-3 were measured in proteins from the tumors. LY3039478 cell line All statistical tests were two-sided.\n\nPerifosine, at see more 30 mu M concentration, decreased AKT phosphorylation and increased apoptosis in all four NB cell lines in vitro. Perifosine-treated mice bearing xenograft NB tumors had longer survival than untreated mice (untreated vs treated, median survival: AS, 13 days, 95% confidence interval [CI] = 11 to 16 days vs not reached, P = .003; NGP, 22 days, 95% CI = 20 to
26 days vs not reached, P = .013; BE2, 24 days, 95% CI = 21 to 27 days vs not reached, P < .001; and KCNR, 18 days, 95% CI = 18 to 21 days vs not reached, P < .001). Perifosine treatment induced regression in AS tumors, growth inhibition in BE2 tumors, and slower growth in NGP and KCNR tumors. Inhibition of AKT phosphorylation and induction of caspase-dependent apoptosis were noted in tumors of perifosine-treated mice in all four in vivo NB tumor models.\n\nPerifosine inhibited the activation of AKT and was an effective cytotoxic agent in NB cells in vitro and in vivo. Our study supports the future clinical evaluation of perifosine for the treatment of NB tumors.”
“Stability of emulsions formulated with 10 wt.% oil (concentrated fish oil, CFO, sunflower
oil, SFO, or olive oil, OO), sodium caseinate GKT137831 concentration concentrations varying from 0.5 to 5 wt.%, giving oil-to-protein ratios of 20-2, and 0, 20, 30 or 40 wt.% aqueous trehalose solution was studied by Turbiscan. Particle size distribution, microstructure, and small angle X-ray scattering (SAXS) patterns were also obtained. The main mechanism of destabilization in a given formulation strongly depended on oil-to-protein ratio. As evidenced by the BS-profile changes with time, emulsions formulated with 0.5 and 1 wt.% NaCas destabilized mainly by creaming while for the 2 wt.% NaCas concentration, both creaming and flocculation mechanisms, were involved. The main destabilization mechanism for the 3, 4 or 5 wt.% NaCas emulsions was flocculation. Stability of emulsions was also affected by the content of trehalose in the aqueous phase. Trehalose diminished the volume-weighted mean diameter (D(4.3)) and greatly improved stability. (C) 2010 Elsevier Ltd.