Journal: PLoS Pathogens
Article Title: CIB1 Synergizes with EphrinA2 to Regulate Kaposi's Sarcoma-Associated Herpesvirus Macropinocytic Entry in Human Microvascular Dermal Endothelial Cells
Figure Lengend Snippet: Effect of CIB1 knockdown on de novo KSHV infection. (A) Untransduced, control or CIB1-shRNA transduced HMVEC-d cells were infected with KSHV (20 DNA copies/cell). At 24 h p.i., cells were harvested, total RNA was isolated, and viral gene expression was determined by real-time RT-PCR with KSHV ORF73 gene specific primers. Results are presented as percentage of inhibition of KSHV gene expression by sh-CIB1 or control compared with the infected untransduced cells. ***P = 0.0001. (B) (i) Control or CIB1-shRNA transduced HMVEC-d cells were mock or KSHV infected (20 DNA copies/cell) for 2 h at 37°C, washed to remove unbound viruses, and continued to culture for another 46 h. At 48 h p.i., cells were processed for immunofluorescence analysis using mouse anti-LANA-1 antibodies and co-stained with DAPI. Representative images are shown. (B) (ii) The percentage of cells observed positive for characteristic punctate LANA-1 staining in IFA is presented graphically. A minimum of three independent fields, each with at least 10 cells were chosen. Error bars show ± SD. (C) Control or CIB1-shRNA transduced HMVEC-d cells were mock or HSV-1 infected (3 pfu/cell) for 2 h at 37°C, washed to remove unbound viruses, and incubated for another 6 h. At 8 h p.i., cells were harvested, total RNA was isolated, and HSV-1 gene expression was quantified by SYBR green q-PCR method with ICP0 and ICP4 gene specific primers. Results are presented as fold HSV-1 gene expression normalized to internal tubulin control. Error bars show ± SD. (D) 293 cells were either mock-transfected or transfected with CIB1 overexpressing vector pcDNA-CIB1-Myc using lipofectamine. At 48 h post-transfection, CIB1 overexpression was examined by Western blotting with rabbit anti-CIB1 and mouse anti-Myc antibodies. Actin was used as loading control. (E) At 48 h post-transfection, transfected 293 cells were infected with KSHV (20 DNA copies/cell) for 2 h at 37°C for entry experiments. Post-washing, total DNA was isolated and KSHV entry was determined by real-time DNA-PCR for the ORF73 gene. Each reaction was done in triplicate and each bar represents the average ± SD of three independent experiments. Results are presented as percentage increase in KSHV DNA internalization in pcDNA-CIB1-Myc expressing cells compared with the control vector transfected cells, which is considered as 100%.
Article Snippet: Equal volumes of prepared cDNA were used for quantification of HSV-1 gene ICP0 and ICP4 transcripts with the Power SYBR Green PCR master mix (Applied biosystems) according to the manufacturer's protocol.
Techniques: Infection, shRNA, Isolation, Expressing, Quantitative RT-PCR, Inhibition, Immunofluorescence, Staining, Incubation, SYBR Green Assay, Polymerase Chain Reaction, Transfection, Plasmid Preparation, Over Expression, Western Blot