Transient transfection Transient transfection of cell lines with expression vec tors was performed using the Lipofectamine LTX trans fection reagent according to the manufacturers protocol. In brief, cells were grown in 96 well culture plates until they reached 90% conflu ence. The culture medium was replaced with serum free Opti MEM and cells were trans fected with the DNA lipofectamine complex. HaCaT cells were transiently transfected with 0. 1 ug well of plasmid in 96 well plates. Immunofluorescence imaging and cytometric analysis Transfected HaCaT cells were fixed with 4% paraformal dehyde for 15 min at room temperature and blocked in 5% BSA. And the cells were incubated with an anti STAT3 antibody, followed by incubation with FITC conjugated anti rabbit IgG and PI for stain ing nuclei.
Visualized on an IN Cell Analyzer 2000, image acquisition was configured to yield at least 1,000 cells per replicate well. Cytometric analysis performed with IN Cell Analyzer Workstation selleck chemical version 3. 2. STAT3 nu clear entry was determined by measuring the nucleus cytoplasm intensity ratio of green fluorescence with the Nuclear Translocation analysis module. Represen tatives of STAT3 nuclear translocation were shown as means SD. Statistical analysis Statistical analysis was performed using a nonrepeated one way analysis of variance followed by the Dunnett test for multiple comparisons. p values 0. 01 were considered significant. Results Effects of stattic on everolimus induced cell growth inhibition in various cell lines Figure 2 shows the everolimus induced cell growth in hibition in HaCaT, Caki 1, and HepG2 cells in the ab sence or presence of the STAT3 inhibitor stattic.
We found that the everolimus induced cell growth inhibition in HaCaT cells was enhanced by pretreatment with stat tic. In contrast, the L-Mimosine VEGFR inhibitor everolimus induced cell growth in hibition in Caki 1 and HepG2 cells was unaffected by stattic treatment. There was no significant difference on absorbance values with cell toxicity of control and stattic as not including everolimus in these cells. Effects of STAT3 inhibitors on apoptotic effects in HaCaT cells To confirm that the apoptotic effects of everolimus were enhanced by pretreatment with stattic, we performed an apoptosis assay. Imaging cytometric analysis of apoptotic cells by Annexin V PI staining showed that apoptosis in HaCaT cells was increased after everolimus treatment in a dose dependent manner.
Moreover, the percentage of apoptotic cells was enhanced by stattic pretreatment. These results indicate that stattic pretreat ment enhances the apoptotic effects of everolimus in HaCaT cells. Effects of various JAK STAT pathway inhibitors on everolimus induced cell growth inhibition in HaCaT cells In the presence of another STAT3 inhibitor, the everolimus induced cell growth inhibition observed in HaCaT cells was also enhanced, whereas a JAK2 in hibitor did not affect the everolimus induced cell growth inhibition.
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