Tumor Necrosis Factor α (TNF) (0.5 μg/ml) from Immunotools, Germany, and/or an inhibitor of the PI3K/AKT signaling, 10 μM LY294002, or an inhibitor of NFκB signaling, 1 μM BAY 11 7082, which were both obtained from Calbiochem, France, were added at the time of sphere seeding and not re-added during the 7 days of sphere formation.
After 7 days of culture, spheres obtained in CD133+ cells were seeded in standard plates with 10% FBS.
After 6 days of culture, spheres were fixed with 4% paraformaldehyde/0.1 M phosphate buffer (4% PFA/PB), washed with a graded sucrose (0 25%)/0.01 M PBS series and stained using rabbit anti-connexin43 polyclonal antibody (dilution, 1∶1000; incubation, 4°C over-night; SIGMA, Saint Louis, Missouri, USA).
After 10 days of culture, spheres larger than 10 cells in diameter were counted.
After 5 days of culture, spheres were removed by centrifugation and supernatant was filtered through a 0.2-μm membrane.
After 10 14 days of incubation, spheres were consolidated into a 96-well plate and imaged on an EVOS fluorescence microscope (AMG & Life Tech) after DAPI staining and they were also counted using GelCount™ (Oxford Optronix) following iodonitratetrazolium chloride staining.
After 3 days of culture, individual spheres were selected by micromanipulation, and subjected to Y-chromosome specific PCR.
After 12 days of culture, the spheres were plated onto a poly-L-Lysine/Laminin coated dish and cultivated in neural stem cell medium (NSCM) containing high concentrations of FGF-2 and epidermal growth factor (EGF).
Part of the beauty of the movement was the rational, open discourse that harkened back to the days of the wobegon public sphere, but even within the sphere, there were too many conflicts of interest.
Media was replaced every 2 3 days and number of spheres formed in 2 weeks was counted under light microscope.
After 7 days incubation, photomicrographs of spheres were acquired under an inverted phase-contrast microscope (Olympus America Inc., Center Valley, PA), and the number of hCSCs was counted using a hemocytometer.
