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 Ig1–4 reduce, while scFvs against Fn1–3 enhance levels of phospho-src and downstream phospho-Erk1/2. Cultured SK-N-SH cells were incubated with L1/ecd (as positive control), non-immune human IgG (as negative control), and scFvs I4, I6, I13, or I27 for 30 min in serum-free medium. ( A ) Levels of src and phospho-src of cells treated with L1/ecd (at 16.5 µM, right) or untreated (control, left), with lanes 1, 2 and 3 showing representative blots from three independent experiments with L1/ecd treated or untreated cells. ( B ) Src and phospho-src levels of cells treated with non-immune human IgG, L1/ecd or I27 (all at 16.5 µM) or left untreated (control). ( C ) Src and phospho-srclevels of cells treated with the indicated concentrations of scFv I4 or I6. ( D ) Src and phospho-src levels of cells treated with the indicated concentrations of scFv I13 or I27. ( E–F ) Comparison of levels of src and phospho-src ( E ) and Erk1/2 and phospho-Erk1/2 ( F ) in untreated cells (control) or cells treated with IgG, scFv I4, I6, I13 or I27 (all at 16.5 µM). Representative images from three independent experiments are shown in A–E . For the quantification shown in C–F , values of phospho-src ( C–E ) and phospho-Erk1/2 ( F ) were normalized to GAPDH as loading control. Mean values ± SEM from three independent experiments are shown. 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: Cell Culture, Incubation, Positive Control, Negative Control