title: Epithelial-mesenchymal interactions allow for epidermal cells to display an in vivo-like phenotype in vitro.
abstract: We here report that preservation of the basic epithelial-mesenchymal interactions allows for highly complex ex vivo function of epidermal cells. The approach taken is based on the preparation of organ fragments that preserve the basic epithelial/mesenchymal interactions but also ensure appropriate diffusion of nutrients and gases to all cells. Human and mice keratinocytes in such organ fragments, remain viable, proliferate and express epidermal-specific gene products when cultured in serum-free medium without added growth factors, for several weeks in vitro. When implanted into syngeneic animals they remain viable, become vascularized and continue to function and transcribe tissue-specific gene products for several months. Such fragments allow primary cells ex vivo to preserve most of the functional attributes of the in vivo system. Clearly, the effect of the extracellular matrix is critical in this system in order for the cells to proliferate and differentiate ex vivo. We are not aware of any other system which allows for localized expression of epidermal-specific genes ex vivo for significant periods in culture in defined serum-free medium.
authors.affiliation: Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. mitrani@vms.huji.ac.il
authors.forename: Eduardo
authors.initials: E
authors.lastname: Mitrani
authors.forename: Guy
authors.initials: G
authors.lastname: Nadel
authors.forename: Eilat
authors.initials: E
authors.lastname: Hasson
authors.forename: Esther
authors.initials: E
authors.lastname: Harari
authors.forename: Yael
authors.initials: Y
authors.lastname: Shimoni
mesh_terms: D001483:Base Sequence; D015415:Biomarkers; D018929:Cell Culture Techniques / Q000379:methods; D017931:DNA Primers; D004261:DNA Replication; D000078404:Epidermal Cells; D004817:Epidermis / Q000502:physiology*; D004847:Epithelial Cells / Q000166:cytology / Q000502:physiology*; D006801:Humans; D007223:Infant; D008297:Male; D008648:Mesoderm / Q000166:cytology / Q000502:physiology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012867:Skin / Q000166:cytology; D012879:Skin Physiological Phenomena; D013997:Time Factors
chemical_list: D015415:Biomarkers; D017931:DNA Primers