Cell lysis and immunobloting Cells were washed twice with cold 0. 01 M PBS, pH 7. 4. For Peptide synthesis Western blotting, cells were lysed in buffer containing 50 mM Tris, 150 mM NaCl, 1 %Triton X one hundred, and the following protease inhibitors 1 mM phenyl methyl sulfonyl fluoride, and leupeptin, aprotinin, and pepstatin, each at 1 g ml. The concentration of proteins was calcu lated in the absorption optimum at 280 nm, as de scribed previously, as well as concentration of xanthurenic acid from its absorption maximum at 342 nm. The lysate was centrifuged for ten min at 14 000 g, plus the supernatant was boiled in loading buffer for 5 min. Proteins were separated by SDS Web page containing ten or 12. 5% acrylamide. Soon after transfer to Hybond ECL membrane the proteins were probed with all the ideal antibodies.
Chemilunimes cence ECL program was made use of for the detection of peroxi dase conjugated secondary antibody. Immunofluorescence studies Cells grown on glass coverslips had been fixed for 10 min at space temperature in 4% paraformaldehyde in 0. 1 M PIPES, pH 6. 8, washed in PBS and permeabilized for 5 min in PIPES containing 0. 05% saponin, washed in PBS, incubated for 10 min in cold aceton Bcr-Abl signaling pathway for further repairing and permeabilisation, and once more washed in PBS. Cells have been incubated for 1. 5 hour with the initial antibody diluted in PBS containing 1% bovine serum albumine, and right after washing incubated for 1. 5 hour using the secondary antibody. The coverslips have been then washed in PBS and incubated for 10 min with 65 l of solution containing 1?l of Hoechst 33342 dye, washed in PBS, and incubated with Antifade Kits in accordance on the suppli ers instruction.
Staining of mitochondria was performed making use of Mitotracker CMXRos, as follows confluent cells cul tures have been pre incubated without the need of or with xanthurenic acid in MEM medium for 72 hrs. The medium was removed and replace with medium containing 100 nM Mitotracker CMXRos. Following an incubation for 1 hour Mitotracker CMXRos was removed, coverslips were washed twice with PBS, and mounted on the slides utilizing as antioxidative so lution 9% w v of Mowiol in 22% glycerol buffered with 0. 2 mM Tris HCl to pH containing 3. 5% of 1,4 diazabicyclo octane. Mem branes had been stained using overnight incubation in DiOC18 at concentration of 12 M in MEM medium.
Final results Xanthurenic kinase inhibitor Roscovitine acid activates caspase 3 and translocates gel solin from the mitochondrial region to the cytoskeleton We observed that ten M xanthurenic acid in the HuLEC cell culture medium activate caspase 3. From the very same cells the translocation of gelsolin from perinuclear region to cytoskeleton was observed. Previ ously it was reported that caspase 3 and 9 are connected with mitochondrial membranes. Gelsolin may be the cy toskeletal protein responsible for your disintegration of F actin for the duration of apoptosis induced by Fas. It was also suggested that gelsolin keeps caspases in the inactive state.