Long-Term Maintenance of Human Keratinocytes In Vitro

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Long-Term Maintenance of Human Keratinocytes In Vitro Jens Hasskarl, Palanivel Velupillai, Siribang-on Piboonniyom, Miranda Grace, Karl Münger  Journal of Investigative Dermatology  Volume 124, Issue 2, Pages 475-478 (February 2005) DOI: 10.1111/j.0022-202X.2004.23574.x Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Long-term growth capacity of primary human foreskin keratinocytes (HFK) and primary human foreskin fibroblasts (HFF). (A) Representative growth curves of keratinocytes and fibroblasts grown under the indicated culture conditions (HO, hydrophobic, TC, standard tissue culture, F, feeder layers). Cells were continuously passaged every 3 d (3 × 105 cells per 10 cm dish) on the indicated culture dishes until the cells ceased to proliferate. The fraction of non-attaching cells was negligible. Number of population doublings per passage was calculated using the formula PD=(Nt-Np)/Np, where Nt is the total number of cells harvested and Np is the number of cells plated. HFK were maintained in serum-free keratinocyte growth medium (K-SFM; Invitrogen, Carlsbad, California) supplemented with recombinant human epidermal growth factor (5 ng per mL), bovine pituitary extract (50 μg per mL), and antibiotics. HFF were maintained in DMEM (Invitrogen) with 10% FBS, supplemented with glutamine (2 mM) and antibiotics. For growth on feeder layers, mitomycin C-treated (4 μg per mL Mitomycin C; Sigma, St Louis, Missouri) Swiss 3T3 J2 mouse fibroblasts (obtained from H. Green, Harvard Medical School, Boston, Massachusetts) or HFF were used as feeder cells and maintained in F-medium (0.66 mM Ca2+, three parts DMEM, one part Ham's F-12), or E-medium (Meyers et al, 1994). Results are represented as averages and standard deviations from ten (TC and HO) and three (F) independent experiments for HFK. For HFF, results from a representative experiment are shown. HFK and HFF populations were established as described previously (Hasskarl et al, 2004). (B) Colony formation assay. Number of colonies per plate after 4 wk. HFK from populations on HO and TC plates at passage number 5 were plated at the indicated density onto mitomycin C-treated feeder cells in 10 cm dishes. Cultures were maintained in E medium for 4 wk, fixed in 4% paraformaldehyde, pH 7.4, and stained with 1% Rhodamine B to visualize individual colonies. Inset: Average number of colonies per 10 cm plate with three different cell populations±standard deviation is depicted. (C) Representative photomicrographs of HFK colonies (). Colonies in the TC plate and those on the HO plate not marked with are derived from surviving fibroblasts, as confirmed by microscopic examination. Scale bar=1 cm. Journal of Investigative Dermatology 2005 124, 475-478DOI: (10.1111/j.0022-202X.2004.23574.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Analysis of senescence markers, telomere length, and integrin expression. (A) Expression analysis of proliferation and differentiation markers of human foreskin keratinocytes (HFK). Total cell lysates were prepared as described previously (Hasskarl et al, 2004) and western blotting was performed according to standard procedures. Primary antibodies used were: p16INK4A (C-20, Santa Cruz Biotechnology, Santa Cruz, California), hTERT (H-231, Santa Cruz Biotechnology), Transglutaminase II (Ab-2, Neomarkers, Fremont, California), and Involucrin (Ab-1, Neomarkers). HO, cells growing on hydrophobic dishes at the passage number indicated; TC, cells growing under standard tissue culture conditions at the passage number indicated; N, hTERT-immortalized human oral keratinocytes (negative control for p16INK4A); S, SaOS-2 (positive control for p16INK4A). (B) Analysis of telomere length of HFK grown on either standard tissue culture dishes (TC) or hydrophobic dishes (HO) for the indicated number of passages. Genomic DNA (2 μg) was subjected to telomere length analysis using the Telo TAGGG Telomere Length Assay (Roche Diagnostics GmbH, Mannheim, Germany) according to the manufacturer's protocol. L, Control-DNA, low-molecular-weight telomeres; H, Control-DNA, high-molecular-weight telomeres; MW, molecular weight marker. (C) Expression analysis of integrin expression. Expression of integrin α6, β4 and β1, and CD71 of HFK growing on hydrophobic () or standard tissue culture dishes (). Dotted: isotype control. Representative experiment of three independent experiments. HFK were harvested using 1% EDTA in PBS, and re-suspended in fluorescence-activated cell sorting (FACS) buffer (PBS containing 2% FBS and 0.1% sodium azide). Approximately 106 cells were incubated with fluorochrome-labeled antibodies for 30 min on ice, washed three times with FACS-buffer, and fixed in 2%p-formaldehyde in PBS. Analysis of a minimum of 10,000 events per sample after gating ensured statistical significance. Antibodies used were R-phycoerythrin (R-PE)- and allophycocyanin Fluorescein isothiocyanate (FITC)-conjugated rat anti-human integrin α6, R-PE-conjugated rat anti-human integrin β4, APC-conjugated mouse anti-human integrin β1, and FITC-conjugated rat anti-human CD71, together with matched isotype controls (PharMingen, San Diego, California). Samples were analyzed using a FACSCalibur cell sorter (Becton Dickinson, Franklin Lakes, New Jersey). Journal of Investigative Dermatology 2005 124, 475-478DOI: (10.1111/j.0022-202X.2004.23574.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions