毛囊混合细胞植入胶原/壳聚糖多孔支架诱导裸鼠毛发生长及支架内形成血管样结构

目的 探讨利用毛囊混合细胞植入胶原,壳聚糖多孔支架内重建毛囊的可行性与支架内血管形成状态.方法 用注射法将体外培养的C57BL/6J近交系乳鼠背部皮肤毛囊混合细胞接种至胶原,壳聚糖多孔支架,培养2周后,将含毛囊混合细胞胶原/壳聚糖多孔支架植入裸鼠皮下,肉眼观察裸鼠背部毛发形成情况.6周后取移植区皮肤组织经10%甲醛固定后行组织学观察(HE染色).结果 移植至裸鼠皮下5周后,裸鼠背部在含毛囊混合细胞的胶原,壳聚糖多孔支架移植区皮肤出现毛发,丰长,6周后取皮肤组织作HE染色发现有分化成熟的毛囊形成,且支架内有血管样结构形成.而空白胶原/壳聚糖多孔支架移植区皮肤未发现毛生长,组织检杳也未发现有毛囊形成,且只有在支架表浅部位有少黑血管样结构形成.结论 毛囊混合细胞植入胶原/壳聚糖多孔支架内可诱导裸鼠毛发的形成,促进支架血管样结构的形成.

Potency of hair follicle bulb cells implanted into collagen/chitosan porous scaffolds to induce the growth of hair and formation of vessel-like structure in scaffolds

Objective To investigate the possibility of hair follicle reformation induced by hair follicle bulb cells implanted into collagen/chitosan porous scaffolds in vivo, and to observe the angiogenesis in implanted scaffolds.Methods Hair follicle bulb cells obtained by enzyme digestion from the hack skin of C57BL/6J mice were implanted into collagen/chitosan porous scaffolds followed by 2-week organotypie culture.Then,these collagen/chitosan porous scaffolds were transplanted subcutaneously into the dorsal skin of nude mice.Those nude mice transplanted with empty collagen/chitosan porous scaffolds served as the controls.The growth of hair was observed with naked eyes.Six weeks after the transplantation,skin samples were obtained from the recipient site and subjected to histological examination.Results Five weeks after the transplantation,hair growth was observed in the dorsal skin of nude mice.Six weeks later,histological examination revealed fully differentiated hair follicles and vessel-like structures in the center of collagen/chitosan porous scaffolds.However,the transplantation with empty collagen/chitosan porous scaffolds failed to elicit the same response.No hair or follicles were observed in the control mice alpng with small number of vessel-1ike structures.Con-clusions Hair follicle bulb ceils implanted into collagen/chitosan porous scaffolds in vivo could induce hair follicle reformation and promote the formation of vessel-like structure in the scafffold center.