Journal: PLoS ONE
Article Title: Antibody Fragments Directed against Different Portions of the Human Neural Cell Adhesion Molecule L1 Act as Inhibitors or Activators of L1 Function
doi: 10.1371/journal.pone.0052404
Figure Lengend Snippet: ScFvs against Fn1–3 protect cells from H 2 O 2 –induced death and increase the ratio of Bcl-2/Bax. SK-N-SH cells were seeded into poly-D-lysine (PDL)-pretreated culture plates coated with L1/ecd (as positive control), non-immune human IgG (as negative control), and scFvs I4, I6, I13, or I27 and maintained for 5 days in serum-free medium. In addition, SK-N-SH cells grown for 12 hours were pre-incubated with 250 µM H 2 O 2 for 2 hours in serum-free medium. After removal of H 2 O 2 , scFvs I13 and I27 were added at the indicated concentrations and cells were cultured for additional 24 hours. ( A ) ScFvs treatment for 5 days. Cell survival was measured by the MST-8 assay. ( B ) L1/ecd, non-immune human IgG, scFvs I4, I6, I13 or I27 (all at 16.5 µM) treatment for 24 hours for Western blot assay of Bcl-2 and Bax protein expression. ( C ) ScFv treatment for 12 hours. ( D ) ScFv treatment for 24 hours. ( C, D ) Cell viability was measured by the MST-8 assay. Data represent mean values ± SEM from four independent experiments. Asterisks denote significant differences from control. *** p
Article Snippet: Twenty five µg protein was subjected to 12% SDS-PAGE, transferred onto a PVDF membrane (Millipore, Temecula, CA, USA), and probed with rabbit anti-human src (Santa Cruz Biotechnology, Santa Cruz, CA, USA), mouse anti-phospho-src (Santa Cruz Biotechnology), mouse anti-phospho-Erk1/2 (Beyotime), rabbit anti-human Erk1/2 (Beyotime), rabbit anti-human Bcl-2 (Biosis, Bei Jing, China), mouse anti-human Bax, mouse anti-human GAPDH (glyceraldehyde-3-phosphate dehydrogenase) (BOSTER, Wu Han, China).
Techniques: Positive Control, Negative Control, Incubation, Cell Culture, Microscale Thermophoresis, Western Blot, Expressing