Background Dermal papilla cells （DPC） are a group of mesenchyme-derived cells at the base of the hair follicle, where they regulate and control hair follicle growth through the expression and secretion of cytokines....Background Dermal papilla cells （DPC） are a group of mesenchyme-derived cells at the base of the hair follicle, where they regulate and control hair follicle growth through the expression and secretion of cytokines. Nevertheless, the role of DPC derived chemokines and other cytokines in the hair follicle biology remain speculative. In this study, we investigated the expression of basic fibroblast growth factor （bFGF）, endothelin-1 （ET-1） and stem cell factor （SCF） in different passages of cultured DPC and their effects on the biological behaviour of DPC. Methods The expression of bFGF, ET-1 and SCF in different passages of cultured DPC and their possible effects on the biological behavior of DPC are investigated using in sire hybridization and immunochemistry. In addition, we performed transplantation of hair follicle cells into nude mice. The cultured DPC, dermal sheath cells and fibroblast of human scalp, respectively, were mixed with cells of the hair follicle epithelium in different ratios, and then were cultured in hair follicle organotypic cultures or implanted into the subcutis of nude mice. Results The expression of ET-1 and SCF in early passages of cultured DPC became stronger, but turned weaker and even negative in late passages （〉6 passages）. Hair follicle-like structures were formed after DPC combined with the cells of hair follicle epithelium cells in hair follicle organotypic cultures. When hair follicle organotypic cultures were implanted into the subcutis of nude mice, the relative intact hair follicles were formed. After the transplantation of hair follicle cells into the nude mice, the hair follicle-like structure was formed in the group that contained DPC mixed with hair follicle epithelium cells. However, no hair follicles were formed in the other two groups. It was found that the higher the expression of ET-1 and SCF in DPC, the stronger the ability of DPC to induce hair follicle regeneration. Conclusions The cultured DPC can induce hair follicle regeneration and sustain展开更多
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 follic...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 field is attractive not only to academic researchers展开更多
目的:探讨人分泌型卷曲相关蛋白1(secreted frizzled related protein 1, SFRP1)基因在人毛乳头中的表达及其转录机制。方法:应用免疫组化观察SFRP1在雄激素性秃发(androgenetic alopecia, AGA)患者秃发区的毛囊与非AGA患者的正常毛囊...目的:探讨人分泌型卷曲相关蛋白1(secreted frizzled related protein 1, SFRP1)基因在人毛乳头中的表达及其转录机制。方法:应用免疫组化观察SFRP1在雄激素性秃发(androgenetic alopecia, AGA)患者秃发区的毛囊与非AGA患者的正常毛囊毛乳头部位的表达情况。采用按基因组序列设计的引物,通过PCR克隆人SFRP1启动子片段,将之插入荧光素酶报告基因载体pGL3-basic中,构建不同截短片段的重组质粒并瞬时转染毛乳头细胞,测定质粒在毛乳头细胞中的启动子活性,找到核心启动子区域,运用生物信息学方法预测其潜在的转录因子结合位点。结果:免疫组化结果显示AGA患者毛乳头中SFRP1表达量显著高于非AGA患者。经菌液PCR、双酶切、测序,成功构建了人SFRP1启动子及其截短片段重组质粒,并确定其启动子活性区域位于-100~+50bp区域内,且可能含有E2F3、HIF1A::ARNT、FOXC1、SP1等转录因子结合位点。结论:SFRP1在AGA患者毛乳头中表达呈阳性,人SFRP1启动子荧光素酶报告质粒构建成功,其转录因子结合位点初步确定,为进一步的研究奠定基础。展开更多
基金The study was supported by a grant from Zhejiang Provincial Science and Technology Fund (No. 2003C23012).
文摘Background Dermal papilla cells （DPC） are a group of mesenchyme-derived cells at the base of the hair follicle, where they regulate and control hair follicle growth through the expression and secretion of cytokines. Nevertheless, the role of DPC derived chemokines and other cytokines in the hair follicle biology remain speculative. In this study, we investigated the expression of basic fibroblast growth factor （bFGF）, endothelin-1 （ET-1） and stem cell factor （SCF） in different passages of cultured DPC and their effects on the biological behaviour of DPC. Methods The expression of bFGF, ET-1 and SCF in different passages of cultured DPC and their possible effects on the biological behavior of DPC are investigated using in sire hybridization and immunochemistry. In addition, we performed transplantation of hair follicle cells into nude mice. The cultured DPC, dermal sheath cells and fibroblast of human scalp, respectively, were mixed with cells of the hair follicle epithelium in different ratios, and then were cultured in hair follicle organotypic cultures or implanted into the subcutis of nude mice. Results The expression of ET-1 and SCF in early passages of cultured DPC became stronger, but turned weaker and even negative in late passages （〉6 passages）. Hair follicle-like structures were formed after DPC combined with the cells of hair follicle epithelium cells in hair follicle organotypic cultures. When hair follicle organotypic cultures were implanted into the subcutis of nude mice, the relative intact hair follicles were formed. After the transplantation of hair follicle cells into the nude mice, the hair follicle-like structure was formed in the group that contained DPC mixed with hair follicle epithelium cells. However, no hair follicles were formed in the other two groups. It was found that the higher the expression of ET-1 and SCF in DPC, the stronger the ability of DPC to induce hair follicle regeneration. Conclusions The cultured DPC can induce hair follicle regeneration and sustain
基金Supported by the Agencia Nacional de Producción Científica y Tecnológica(ANPCyT),No.ANR BIO 0032/10
文摘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 field is attractive not only to academic researchers
文摘目的:探讨人分泌型卷曲相关蛋白1(secreted frizzled related protein 1, SFRP1)基因在人毛乳头中的表达及其转录机制。方法:应用免疫组化观察SFRP1在雄激素性秃发(androgenetic alopecia, AGA)患者秃发区的毛囊与非AGA患者的正常毛囊毛乳头部位的表达情况。采用按基因组序列设计的引物,通过PCR克隆人SFRP1启动子片段,将之插入荧光素酶报告基因载体pGL3-basic中,构建不同截短片段的重组质粒并瞬时转染毛乳头细胞,测定质粒在毛乳头细胞中的启动子活性,找到核心启动子区域,运用生物信息学方法预测其潜在的转录因子结合位点。结果:免疫组化结果显示AGA患者毛乳头中SFRP1表达量显著高于非AGA患者。经菌液PCR、双酶切、测序,成功构建了人SFRP1启动子及其截短片段重组质粒,并确定其启动子活性区域位于-100~+50bp区域内,且可能含有E2F3、HIF1A::ARNT、FOXC1、SP1等转录因子结合位点。结论:SFRP1在AGA患者毛乳头中表达呈阳性,人SFRP1启动子荧光素酶报告质粒构建成功,其转录因子结合位点初步确定,为进一步的研究奠定基础。
