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Chemotactic migration assays were performed using a polyvinyl pyrrolidone-free polycarbonate filter with 12 ��m pores (Corning Costar, Dutcher, Paris, France) precoated with collagen (10 ��g/ml, BD, Paris, France), as previously described [39]. Fifty microliters of serum-starved hCMEC/D3 (106 cells per microliter) were added to the upper chamber, whereas the conditioned media (CM) or corresponding fresh media were added to the lower chamber. Alternatively, CM were preincubated 1 hour at 37��C with 10 ��g/��l anti-ERK1 or anti-HDGF antibodies (Santa Cruz). After 16 hours of incubation, filters were scrubbed to remove the unmigrated cells, fixed with methanol, stained with 4��,6��-diamidino-2-phenylindole (DAPI) (Vectashield), http://www.selleckchem.com/products/erastin.html and analyzed by confocal microscopy. The number http://www.selleckchem.com/products/3-deazaneplanocin-a-dznep.html of cells per field of view was manually counted. Results are presented as mean �� SEM of three independent experiments. GSCs were transfected by electroporation with 50 ��M of control (Ambion AM4611), A (Ambion s229694) or B (Ambion s6500) anti-HDGF siRNAs. The transfection was performed using the L transfection solution (AMAXA) with the X005 program. The CM of GSCs were collected 1 week post-transfection for use in in vivo assays. The corresponding cells were lysed and HDGF protein levels were measured by immunoblotting. GSC-CM were mixed with Matrigel (BD Biosciences, Paris, France) and injected into the flanks of 7-week-old female C57BL/6 mice (Charles River, Paris, France) (450 microliters per graft; 24 volume Matrigel:1 volume CM). The plugs were retrieved 1 week later, fixed in 4% paraformaldehyde, and paraffin embedded. Each plug was cut into serial 8 ��m-thick sections, which were colored with hemalun and phloxin. Images were acquired on a digital still camera (DXM 1200, Nikon Instruments, Melville, NY, http://www.nikoninstruments.com) using the Lucia software (Laboratory Imaging, Ltd, http://www.laboratory-imaging.com). Determination of endothelial cell and neovessel numbers was performed on one every other http://www.selleck.cn/products/pf-06463922.html section. 2D-DIGE was used to obtain a quantitative global overview of the proteins differentially expressed between the three conditions, namely GSC, NSC, and TT. Principal component analysis revealed patterns that segregated into three distinct groups. This segregation separation persisted when each detected spot was aligned (2,083) as well as after a quantitative selection refinement. This latter selection, based on a significant variation of intensity in one group as compared to each of the two others (>1.4-fold; Student's t test, p