Publication protocol
Murine Epidermal Keratinocyte Isolation and Culture. Epidermal keratinocytes were isolated from telogen back skin collected from 8- to 18-wk-old mice, as previously described (28, 44). Viable keratinocytes were plated at a density of 2,500 cells per 10 µL BME (Cultrex) drop. Cells were cultured in EEM consisting of advanced DMEM/F12 (Gibco) supplemented with penicillin/streptomycin (100 U/L; Gibco), Hepes, (10 mM; Gibco), GlutaMAX (1×; Gibco), B27 supplement (50× stock; Gibco), N-Acetylcysteine-1 (1 mM; Sigma-Aldrich), Noggin-conditioned medium (5%, in-house), R-spondin 1-conditioned medium (5%, in-house, derived from 293T-HA-RspoI-Fc cells provided by Calvin Kuo, Stanford University, Stanford, CA), acidic FGF1 (100 µg/mL; Peprotech), Heparin (0.2%; Stemcell Technologies), Forskolin (10 ng/mL; Tocris), Rho kinase inhibitor (Y-27632; 10 µM; Sigma-Aldrich), and Primocin (500× stock; Invivogen). Additional components tested include FGF10 (100 µg/mL; Peprotech), TGF-β inhibitor (A-83-01; 2 µM; Tocris), and EGF (50 ng/mL; Invitrogen). Upon seeding or passaging, medium was refreshed every 3–4 d. Organoid cultures were passaged every 7 d in an approximate ratio of 1 to 4 at a density of 2,500 viable cells per 10-µL BME drop. Organoid cultures were stored long term in −80 °C or in liquid nitrogen. Two-dimensional feeder layer-dependent culture of murine epidermal keratinocytes was described elsewhere (28). Further details are given in SI Appendix, SI Materials and Methods.
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