Journal: BMC Microbiology
Article Title: 6-thioguanine inhibits EV71 replication by reducing BIRC3-mediated autophagy
doi: 10.1186/s12866-025-03752-8
Figure Lengend Snippet: BIRC3 promoted EV71 replication and reversed the anti-EV71 effect of 6-TG. ( A and B ) HeLa cells were transfected with three specific siRNAs targeting BIRC3 (siBIRC3 #1, siBIRC3 #2, siBIRC3 #3) or control siRNA (siNC) for 30 h. The cells were harvested and the BIRC3 RNA levels were quantified via quantitative real-time PCR, normalized against GAPDH ( A ), the BIRC3 protein levels were evaluated by western blot assay, normalized to β-actin ( B ). ( C and D ) HeLa cells were transfected with siBIRC3 or siNC for 30 h, and then infected with EV71 at an MOI of 0.5 for 24 h. The cells were harvested and the EV71 RNA levels were quantified via quantitative real-time PCR, normalized against GAPDH ( C ). The EV71 VP1 protein expression was evaluated by western blot assay, normalized to β-actin. The intensity of western blot bands signals was quantified by ImageJ software ( D ). ( E and F ) HeLa cells were transfected with 1 µg plasmid encoding BIRC3 (pBIRC3) or control plasmid (pVector). After 30 h, the cells were collected, and the BIRC3 RNA levels were quantified via quantitative real-time PCR, normalized against GAPDH ( E ), the flag-BIRC3 protein expression was evaluated by western blot assay, normalized to β-actin ( F ). ( G and H ) HeLa cells were transfected with 1 µg pBIRC3 or pVector for 30 h, and then infected with EV71 at an MOI of 0.5 for 24 h. The cells were harvested and EV71 RNA levels were quantified via quantitative real-time PCR, normalized against GAPDH ( G ). The EV71 VP1 protein expression in harvested cells was evaluated by western blot assay, normalized to β-actin. The intensity of western blot bands signals was quantified by ImageJ software ( H ). ( I ) HeLa cells were transfected with 1 µg pBIRC3 or pVector for 30 h, and next infected with EV71 at an MOI of 0.5 for 2 h, then the cells were washed with PBS and incubated with clear culture medium. After 24 h, the culture supernatant was collected and added to Vero cells, the viral titers were calculated as the TCID 50 after 72 h incubation. ( J and K ) HeLa cells were transfected with 1 µg pBIRC3 or an empty Vector for 30 h, then the cells were infected with EV71 at an MOI of 0.5 in the presence of 1 µM 6-TG for 24 h. The EV71 RNA levels and the BIRC3 RNA levels in harvested cells were quantified via quantitative real-time PCR, normalized against GAPDH. ( L ) HeLa cells were transfected with 1 µg pBIRC3 or an empty Vector for 30 h, then the cells were infected with EV71 at an MOI of 0.5 for 2 h. After washing with PBS, the cells were incubated with 1 µM 6-TG for 24 h. The culture supernatant was collected and added to Vero cells, the viral titers were calculated as the TCID 50 after 72 h incubation. Data were pooled from three ( A , C-E and G-L ) or two ( B and F ) independent experiments, and were shown as the mean ± SEM (* P < 0.05, ** P < 0.01, *** P < 0.001, **** P < 0.0001)
Article Snippet: Rabbit anti-BIRC3 antibody Mouse anti-Flag tag antibody , ABclonal (Wuhan, China) Servicebio (Wuhan, China) , A0833 GB15938-100.
Techniques: Transfection, Control, Real-time Polymerase Chain Reaction, Western Blot, Infection, Expressing, Software, Plasmid Preparation, Incubation