2) and the crosslinking procedure was repeated for additional 45 min with the same concentration of DMP. Control bacteria were treated likewise without antibody addition. Serum treatment of bacteria was performed after coating and crosslinking prior to infection. Bacteria were mixed with fresh serum from naïve mice and incubated for 1 h under vigorous shaking at RT, washed with PBS (pH 8.2) and finally diluted. The amount of SPA per bacterial cell was determined by Western blot analysis. 5 × 108 CFU were resuspended in 100 μl PBS and 0.1 μg of anti NCT-501 manufacturer mouse albumin antibody (Abcam ab34807,

UK) and 200 ng of serum albumin (Sigma, Germany) were added. The suspension was incubated under vigorous shaking for 45 min at RT. Bacteria were washed three times with 0.05% Tween 20 in PBS and analyzed by SDS-PAGE and Western blotting. Handling of Dynabeads Protein A Dynabeads Protein A (Invitrogen, Germany) were coated with Trastuzumab following the manufacturer’s protocol.

1.2 × 105 4T1-HER2 cells were seeded on cover slips in 24-well plates and incubated with antibody-labeled and non-labeled beads. 25 μg beads were added HDAC inhibitor per well in culture medium lacking FCS. Cells were incubated 1 h at 37°C and with 5% CO2. The coverslips were washed in PBS and fixed in 4% PFA for 10 minutes at room temperature. After washing using PBS, the cells were incubated with the second antibody (α-human Cy5, Abcam ab6561, UK) for 1 h at room temperature in the dark. Following an additional washing step in PBS the cover slips were embedded and analyzed by immunofluorescence microscopy. Cell culture and infection experiments 4T1 cells (mouse mammary gland tumor cell line; ATCC/Promochem, Germany) were cultured in RPMI 1640 medium.

4T1-HER2 cells (mouse mammary gland tumor cell line transduced with human HER2, [26]) were cultured in DMEM medium. SK-BR-3 (human mammary adenocarcinoma cell line, ATCC Promochem, Germany) and SK-OV-3 (human ovary adenocarcinoma; ATCC Promochem, Germany) cells were cultured in McCoy’s medium. All media (GIBCO) were supplemented with 10% FCS (PAN, Germany) and cultures were kept under a 5% CO2 atmosphere at 37°C. If not stated otherwise, infection of cell Rucaparib chemical structure lines was performed with 100 bacteria per cell (MOI 100) as described earlier [14]. Briefly 1.2*104 cells were seeded at least 16 h before infection and washed in medium lacking FCS directly before infection. The infection was performed in medium lacking FCS for 1 h and followed by 1 h incubation with medium containing 10% FCS and 100 μg/ml gentamicin to kill BVD-523 order extracellular bacteria. Cells were then lysed in 0.1% Triton-X100 and plated in serial dilutions on agar plates containing the appropriate antibiotics for selection. Animal handling and in vivo experiments Six to eight weeks old, female Balb/c SCID mice were purchased from Harlan, Germany. Xenograft tumor growth was induced by injecting 5 × 104 4T1-HER2 cells into each flank of shaven abdominal skin.