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Epidermal stem cells and skin tissue engineering in hair follicle regeneration

World Journal of Stem Cells 2015年第4期7卷 711-727页

作者： María Eugenia Balaná Hernán Eduardo Charreau Gustavo Jose Leirós Fundación Pablo Cassará-Instituto de Ciencia y Tecnología Dr.César Milstein Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET)Saladillo 2468 C1440FFXCiudad de Buenos AiresArgentina Technology Intelligence Unit ClarkeModet&C°Lavalle 1903°PisoC1047AAD Buenos AiresArgentina

The reconstitution of a fully organized and functional hair follicle from dissociated cells propagated under defined tissue culture conditions is a challenge stillpending in tissue engineering. The loss of hair follicles caused by injuries or pathologies such as alopecia not only affects the patients' psychological well-being, but also endangers certain inherent functions of the skin. It is then of great interest to find different strategies aiming to regenerate or neogenerate the hair follicle under conditions proper of an adult individual. Based upon current knowledge on the epithelial and dermal cells and their interactions during the embryonic hair generation and adult hair cycling, many researchers have tried to obtain mature hair follicles using different strategies and approaches depending on the causes of hair loss. This review summarizes current advances in the different experimental strategies to regenerate or neogenerate hair follicles, with emphasis on those involving neogenesis of hair follicles in adult individuals using isolated cells and tissue engineering. Most of these experiments were performed using rodent cells, particularly from embryonic or newborn origin. However, no successful strategy to generate human hair follicles from adult cells has yet been reported. This review identifies several issues that should be considered to achieve this objective. Perhaps the most important challenge is to provide threedimensional culture conditions mimicking the structure of living tissue. Improving culture conditions that allow the expansion of specific cells while protecting their inductive properties, as well as methods for selecting populations of epithelial stem cells, should give us the necessary tools to overcome the difficulties that constrain human hair follicle neogenesis. An analysis of patent trends shows that the number of patent applications aimed at hair follicle regeneration and neogenesis has been increasing during the last decade. This fiel

关键词： Adult stem cells Skin grafts Epidermis multipotential differentiation Tissue regeneration Dermal papilla Epithelial-mesenchymal interactions

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