Data are presented as means SE (n=5C6) and compared by one-way ANOVA and the Student Newman-Keuls test: *P 0.05 vs. after AZD5153 6-Hydroxy-2-naphthoic acid hemorrhage and resuscitation. To further characterize TFAMs biological activity, we expressed recombinant rat TFAM with a GST-tag (GST-TFAM) in an expression system. The purity of GST-TFAM was over 99% and it was immunoreactive for specific anti-TFAM antibodies. Using RAW 264.7 cells and main rat peritoneal macrophages, we showed that GST-TFAM dose-dependently increased TNF- release. To determine the biological activity of GST-TFAM AZD5153 6-Hydroxy-2-naphthoic acid qualified cells BL21-Platinum (Agilent Technologies, Inc., Santa Clara, CA). The GST fusion protein was purified by Glutathione sepharose 4B beads (GE Healthcare Life Sciences, Pittsburgh, PA) according to the manufacturers instructions. Endotoxin contamination of the protein solution was removed by phase separation using Triton X-114 (17). The content of LPS in the sample was decided using the Limulus Amebocyte Lysate assay (BioWhittaker, Inc., Walkersville, MD) as previously explained (18). The purity of GST-TFAM was evaluated by SDS-PAGE on a 4C20% Tris-HCl gel and visualized using the GelCode Blue Stain Reagent (Pierce Biotechnology, Inc., Rockford, IL). The final product was concentrated by Amicon Ultra-15 Centrifugal Filter Devices to the designed concentrations and stored at ?20C. Cell culture The murine macrophage cell collection RAW 264.7 was purchased from your American Type Culture Collection (ATCC, Manassas, VA). Peritoneal macrophages were isolated from normal male Sprague-Dawley rats. Briefly, peritoneal macrophages were isolated by peritoneal lavage with Hanks balanced salt answer (HBSS) as previously explained (19). RAW 264.7 cells or isolated peritoneal macrophages were cultured in DMEM containing 10% heat-inactivated fetal bovine serum, 10 mM HEPES, 100 U/ml penicillin and 100 g/ml streptomycin at the concentration of 106 cells/ml and plated at a density of 5105/well in 24-well cell culture plates. After being washed twice with HBSS, the cells were cultured in culture medium containing numerous concentrations of GST-TFAM (0.1, 1 and 10 g/ml) or GST alone (5 g/ml) for a period of 4 h. The supernatant levels of TNF- were measured by ELISA as explained below. Administration of GST-TFAM To determine the effect of TFAM expression system. The PIK3R1 TFAM AZD5153 6-Hydroxy-2-naphthoic acid part in the GST-TFAM fusion protein contains 244 amino acids with a molecular excess weight of 28.2 kDa. The total calculated size of the GST-TFAM fusion protein is usually 55.3 kDa. As shown in Fig. 2A, the SDS-PAGE analysis of the fusion protein indicated a single band at ~55 kDa. The purity of our recombinant GST-TFAM was over 99% according to SDS-PAGE method (Fig. 2A). The endotoxin level in the recombinant protein sample was not detectable as measured by Limulus Amebocyte Lysate method (data not shown). Western blot analysis showed that purified GST-TFAM was immunoreactive for specific anti-TFAM antibodies (Fig. 2B). We then stimulated macrophages with recombinant GST-TFAM. As shown in Fig. 3A, addition of GST-TFAM to RAW 264.7 cells, a murine macrophage cell collection, caused an increase of TNF- release in a dose-dependent manner. Since the GST-TFAM fusion protein contains approximately 50% GST, 5 g/ml GST alone (i.e., 50% of the highest dose of GST-TFAM) was used as a control. As shown in Fig. 3A, the GST control alone experienced no detectible effect on TNF- release from RAW 264.7 cells. To confirm this result, we isolated peritoneal macrophages from normal rats. Similarly, GST-TFAM, not GST, dose-dependently increased AZD5153 6-Hydroxy-2-naphthoic acid TNF- release from main AZD5153 6-Hydroxy-2-naphthoic acid peritoneal macrophages (Fig. 3B). Open in a separate window Physique 2 (A) SDS-PAGE analysis of the expressed and purified rat GST-TFAM. Lane 1, purified GST-TFAM (3 g); lane 2, purified GST-TFAM (1.5 g); (B) Western blot analysis of the expressed and purified GST-TFAM. The specific antibody recognizes GST-TFAM by western blot analysis. Lane 1, purified GST-TFAM (5 g from 1st batch); lane 2, purified GST-TFAM (5 g from 2nd batch). Open in a separate.