, hepatomorphologic alterations, activity of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), and glutathione reductase (GR), gene expression of antioxidant enzymes and DNA integrity were evaluated in the liver. IAA administration did not show any alterations in any of the parameters available, except for a reduction of the gene expression for antioxidant enzyrries
by 55, 56, 27, and 28% for SOD, CAT, GPx, and GR upon T(500). respectively compared with the control. Several hepatic alterations were observed by DEN exposure. Moreover, IAA administration at 3 doses was shown to provide a total prevention of the active reduction of CAT and GR induced by DEN exposure TNF-alpha inhibitor compared with the control. IAA at T5(00) was shown to give partial protection (87, 71, 57, and 90% for respectively SOD, CAT. GPx. and
GR) on the down-regulation of the enzymes induced by DEN and this auxin showed a partial protection (50%) on DEN-induced DNA fragmentation for both parameters when compared to DEN alone. This work showed IAA hepatocarcinogenesis protection for the first time by means of a DEN-protective effect on CAT and GR activity. and by affecting antioxidant gene expression and DNA fragmentation. Copyright (C) 2008 John Wiley & Sons, Ltd.”
“There have been conflicting DMXAA reports on the requirement of GSK- 3 beta- mediated phosphorylation of the tumor suppressor adenomatous polyposis coli ( APC) vis-a-vis its ability to bind and degrade beta- catenin. Using a unique combination of loss of function for Shaggy/ GSK- 3 beta and a gain of function for human APC in Drosophila, we show that misexpressed human APC ( hAPC) can still sequester Armadillo/beta- catenin. In addition, human APC could suppress gain of Wnt/ Wingless phenotypes associated with loss of Shaggy/ GSK- 3 beta activity, suggesting that sequestered Armadillo/beta- catenin is non- functional. Based on these studies, we propose that binding per se selleck screening library of b- catenin by APC does not require phosphorylation by GSK- 3 beta.”
“In animal systems, mRNAs subject to posttranscriptional
regulation by small RNAs (sRNAs) often possess multiple binding sites with imperfect complementarity to a given sRNA. In contrast, small RNA-mRNA interactions in bacteria and plants typically involve a single binding site. In a previous study, we demonstrated that the Escherichia coli sRNA SgrS base pairs with a site in the coding region of the first gene of a polycistronic message, manXYZ. This interaction was shown to be responsible for translational repression of manX and to contribute to destabilization of the manXYZ mRNA. In the current study, we report that translational repression of the manY and manZ genes by SgrS requires a second binding site located in the manX-manY intergenic region. Pairing at this site can repress translation of manY and manZ even when mRNA degradation is blocked. Base pairing between SgrS and the manX site does not affect translation of manY or manZ.