We aimed at developing unprecedented metal-based activators of Akt signaling which can potentially find applications as tools for regulating glucose metabolism downstream of Akt or serve as lead structures for developing antidiabetic drugs. In this context, a highly diverse library of 11 new zinc(II) complexes with phenolic, picolinic, pyridino, and hydroxamic ligands, all containing features beneficial for medicinal purposes, was prepared and screened in an assay that detected levels of ARN-509 phospho-Akt in lysates from NIH3T3 cells after treatment with the compounds. The complexes featuring hydroxamic ligands were found to be the most prominent activators of Akt among
the molecules prepared, with the most efficient compound acting at submicromolar concentrations. Adriamycin price Further
characterization revealed that this compound induces phosphorylation of the Akt downstream effector glycogen synthase kinase 3 beta, but does not act as an inhibitor of tyrosine phosphatases or PTEN.”
“Although titanium dioxide (TiO(2)) has been considered to be biologically inert, finding use in cosmetics, paints and food colorants, recent reports have demonstrated that when TiO(2) is attained by UVA radiation oxidative genotoxic and cytotoxic effects are observed in living cells However, data concerning TiO(2)-UVB association is poor, even if UVB radiation represents a major environmental carcinogen Herein, we investigated DNA damage, repair
and mutagenesis induced by TiO(2) associated with UVB irradiation in vitro and in vivo using Saccharomyces cerevisiae model It was found that TiO(2) plus UVB treatment in plasmid pUC18 generated, in addition to cyclobutane pyrimidine Miners (CPDs), specific damage to guanine residues, such as 8-oxo-7,8-dihydroguanine (8-oxoG) and 2,6-diamino-4-hydroxy-5-formamidopyrimidine (FapyG), which are characteristic oxidatively generated lesions In vivo experiments showed that, although the presence of TiO(2) protects yeast cells from UVB cytotoxicity, high mutation frequencies are observed in the wild-type (WT) and in an ogg1 strain (deficient in 8-oxoG and Ilomastat datasheet FapyG repair) Indeed, after TiO(2) plus UVB treatment, induced mutagenesis was drastically enhanced in ogg1 cells, indicating that mutagenic DNA lesions are repaired by the Ogg1 protein This effect could be attenuated by the presence of metallic ion chelators neocuproine or dipyridyl, which partially block oxidatively generated damage occurring via Fenton reactions. Altogether, the results indicate that TiO(2) plus UVB potentates UVB oxidatively generated damage to DNA, possibly via Fenton reactions involving the production of DNA base damage. such as 8-oxo-7,8-dihydroguanine (C) 2010 Elsevier B V All rights reserved”
“We attempted to synthesize a polyhydroxyalkanoate (PHA) containing newly reported 3-hydroxy-4-methylvalerate (3H4MV) monomer by using wild type Burkholderia sp.