Coating cell culture flasks with natural extracellular matrix (ECM) enhanced the culture of adult human keratinocytes from suction-blister roof epidermis in an environment without fetal calf serum (FCS), bovine pituitary extracts or cellular feeder layers. A higher incidence of cell attachment on natural ECM was observed than on collagen and human fibronectins (HFN)-coated plastic dishes, and natural ECM was necessary for growth and proliferation of attached cells under the culture conditions used. Cells in primary culture grew to confluency on natural ECM-coated surfaces within about 14 days, and subsequent serial passage could be made up to fourth passage in collagen- and HFN-coated plastic flasks. Cultured keratinocytes in this serum-free environment formed colonies of small cuboidal, healthy cells with little keratinization or stratification and demonstrated antigenic characteristics of human basal cells.
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