CnT-Prime, Epithelial Culture Medium

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	Normal human epidermal keratinocytes were isolated from neonatal skin. Frozen keratinocytes were thawed and cultivated at clonal density on a feeder layer of irradiated or mitomycin C–treated 3T3-J2 cells, at 37°C and 10% CO2 in a 3:1 mixture of the DMEM and Ham’s F12 medium supplemented with 10% FCS, 5 µg/ml insulin, 0.4 µg/ml hydrocortisone, 10−10 M cholera toxin, and 2 × 10−9 M triiodothyronine. Human epidermal keratinocytes were also cultivated with CnT-PR medium (CELLnTEC), EpiLife medium containing supplement S7 (Life Technologies), and MCDB153 medium containing bovine pituitary extract (Hashimoto et al., 1994). Keratinocytes were used between passages 2 and 7. The medium was changed every 4 d.

Protocol tips

Normal human epidermal keratinocytes were isolated from neonatal skin. Frozen keratinocytes were thawed and cultivated at clonal density on a feeder layer of irradiated or mitomycin C–treated 3T3-J2 cells, at 37°C and 10% CO2 in a 3:1 mixture of the DMEM and Ham’s F12 medium supplemented with 10% FCS, 5 µg/ml insulin, 0.4 µg/ml hydrocortisone, 10−10 M cholera toxin, and 2 × 10−9 M triiodothyronine. Human epidermal keratinocytes were also cultivated with CnT-PR medium (CELLnTEC), EpiLife medium containing supplement S7 (Life Technologies), and MCDB153 medium containing bovine pituitary extract (Hashimoto et al., 1994). Keratinocytes were used between passages 2 and 7. The medium was changed every 4 d.

Publication protocol

Normal human epidermal keratinocytes were isolated from neonatal skin. Frozen keratinocytes were thawed and cultivated at clonal density on a feeder layer of irradiated or mitomycin C–treated 3T3-J2 cells, at 37°C and 10% CO2 in a 3:1 mixture of the DMEM and Ham’s F12 medium supplemented with 10% FCS, 5 µg/ml insulin, 0.4 µg/ml hydrocortisone, 10−10 M cholera toxin, and 2 × 10−9 M triiodothyronine. Human epidermal keratinocytes were also cultivated with CnT-PR medium (CELLnTEC), EpiLife medium containing supplement S7 (Life Technologies), and MCDB153 medium containing bovine pituitary extract (Hashimoto et al., 1994). Keratinocytes were used between passages 2 and 7. The medium was changed every 4 d. Cultures were fixed with 3.7% buffered formaldehyde and stained with 1% rhodamine B, and keratinocyte colonies were counted under a binocular microscope (SMZ645; Nikon). Clonal analysis was performed as described previously (Barrandon and Green, 1987b). In brief, human keratinocytes were cultivated at clonal density on a feeder layer of irradiated or mitomycin C–treated 3T3-J2 cells. Well-isolated colonies were then individually trypsinized in a cloning ring and subcultured into a 10-cm cell culture dish so clonal types could be evaluated.

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