Discussion Envelope infections have been reported to induce cytoskeletal rearrangement and reorganization which results in filopodia formation, a strategy that results in the confinement of the virus to the cell surface and subsequently delivers them to the internalization receptor [16,30,31]. 105 Vero cells were exposed to DENV2 or DENV2 which was inactivated at 56 C, for 45 min [23], at a MOI of 2, or mock-exposed, at 37 C with 5% CO2 for 30 min. The cells were then washed with FACS buffer (1% FBS, 0.1% NaN3, in PBS), fixed with 1% paraformaldehyde in PBS, for 20 min, followed by blocking with blocking buffer (3% BSA in PBS) for 30 min and then incubated with 1:10 dilution of rabbit polyclonal anti-annexin II antibody (ab41803, Abcam, UK) or isotype control antibody (rabbit polyclonal anti-LAT, sc-7948, Santa Cruz, CA, USA) for 1 h on ice. The cells were then washed with an FACS buffer, for three times, centrifuged at 300 for 5 min. Thereafter, the cells were resuspended in 1:100 dilution of Alexa Fluor? 488-conjugated donkey anti-rabbit IgG (Thermo Fisher Scientific, USA) for 1 h on ice, washed twice with FACS buffer. Alda 1 Following staining, the cells were resuspended in PBS, and analyzed, using BD FACS Canto II flow cytometer and BD FACSDiva analysis software (BD Biosciences, San Jose, CA, USA). Unstained Vero cells was used as control. 2.4. Western Blot Analysis of Annexin II upon Dengue Virus Serotype 2 Infection Vero cells were either infected with DENV2 at a MOI of 2 or mock-infected and incubated at 37 C, with 5% CO2 for 10, 24, and 48 h. Plasma membrane proteins from the above cells were extracted separately, using a BioVision plasma membrane protein extraction kit (BioVision, USA). Approximately 50 g of the plasma membrane fraction was resolved by 12% SDS-PAGE and transferred onto PVDF membranes, as described above. The membrane containing transferred protein was blocked with blocking buffer, at room temperature, for two hours, and probed with 1:1000 dilution of rabbit polyclonal anti-annexin II antibody, overnight, at 4 C. The membrane was washed and incubated with 1:1000 dilution of rabbit anti–actin antibody (Cell Signaling Tech., Danvers, MA, USA), at room temperature, for two hours. The membrane was washed and incubated with a 1:9000 dilution of goat anti-rabbit HRP-conjugated secondary antibody (Abcam, UK), at room temperature, for two hours, washed, and then developed by ECL. All the washings were performed, three times, with TBS-T, for ten minutes each time. Images were acquired using a Syngene gel/chemi documentation system (Syngene, UK) and densitometry analysis of bands was undertaken using ImageJ software. 2.5. Antibody-Mediated Infections Inhibition Assay Approximately Alda 1 1 105 Vero cells were seeded in 6-well tissue culture plates (Cellstar, Sigma-Aldrich, USA), in an antibiotic-free EMEM and incubated at 37 C with 5% CO2 for 24 h. Filopodia formation was induced, chemically, using 200 ng of bradykinin, and incubated at 37 C Alda 1 with 5% CO2, for 30 min. Alda 1 Vero cells were washed, twice, with PBS and then incubated with various concentrations of rabbit polyclonal anti-annexin II antibody (5 g, 10 g, and 20 g), non-specific control antibody (rabbit polyclonal anti-His tag antibody), or no antibody, at 37 C, with 5% CO2, for one hour. Vero cells were washed, twice, with PBS and infected with DENV2 at a MOI of 2 and incubated at 37 C, with 5% CO2 for one hour. Vero cells were washed, three times, with PBS and fresh virus media (EMEM supplemented with 2% FBS) was added and incubated at 37 C, with 5% CO2, for 30 h. At Mouse monoclonal antibody to JMJD6. This gene encodes a nuclear protein with a JmjC domain. JmjC domain-containing proteins arepredicted to function as protein hydroxylases or histone demethylases. This protein was firstidentified as a putative phosphatidylserine receptor involved in phagocytosis of apoptotic cells;however, subsequent studies have indicated that it does not directly function in the clearance ofapoptotic cells, and questioned whether it is a true phosphatidylserine receptor. Multipletranscript variants encoding different isoforms have been found for this gene 30 h, post incubation, the extracellular virus (culture media) was collected separately by centrifugation, at 13,000 values less than 0.05 were used for statistical significance. 3. Results 3.1. Identification of Dengue Virus Serotype 2 Binding Protein on Filopodia Filopodia formation was observed when Vero cells were exposed to dengue virus serotype 2 (DENV2) (Figure 1A), whereas no filopodia formation was observed in mock-exposed Vero cells (Figure 1B). In order to identify the molecule on Vero cells.