Department of Dermatology, Kitasato University School of Medicine, Minami Ward, Sagamihara, 252-0374, Japan.
Basic Research Laboratory, National Cancer Institute, Frederick, MD, 21702, USA.
Sci Rep. 2019 Jun 27;9(1):9326. doi: 10.1038/s41598-019-45740-9.
The bulge area of the hair follicle contains hair-follicle-associated pluripotent (HAP) stem cells. Here, we present effective cryopreservation procedures of the human hair follicle that preserve the differentiation potential of HAP stem cells. Whole hair follicles isolated from human scalp were cryopreserved by a slow-rate cooling medium and stored in liquid nitrogen. A careful thawing method was used to collect the upper parts of the human hair follicles which were cultured for four weeks in a Dulbecco's Modified Eagle's Medium with fetal bovine serum (FBS). Proliferating hair follicle cells were then shifted to DMEM/Ham's Nutrient Mixture F-12 medium without FBS and allowed to grow for one week. These proliferating cells were able to produce HAP stem cell colonies with multilineage differentiation capacity. They produced keratinocytes, smooth muscle cells, cardiac muscle cells, neurons and glial cells. Interestingly, these cryopreserved hair follicles produced pluripotent HAP stem cell colonies similar to fresh follicles. These findings suggest that the cryopreserved whole human hair follicle preserves the ability to produce HAP stem cells, which will enable any individual to preserve a bank of these stem cells for personalized regenerative medicine.
毛囊的膨大部分含有毛囊相关多能(HAP)干细胞。在这里,我们提出了一种有效的人类毛囊冷冻保存程序,该程序可保持 HAP 干细胞的分化潜能。从人头皮中分离出的整个毛囊通过慢速率冷却介质冷冻保存,并储存在液氮中。使用小心的解冻方法收集人类毛囊的上部分,将其在含有胎牛血清(FBS)的杜氏改良伊格尔培养基(DMEM)中培养四周。然后将增殖的毛囊细胞转移到不含 FBS 的 DMEM/Ham's 营养混合物 F-12 培养基中,并允许生长一周。这些增殖细胞能够产生具有多能分化能力的 HAP 干细胞集落。它们产生角质形成细胞、平滑肌细胞、心肌细胞、神经元和神经胶质细胞。有趣的是,这些冷冻保存的毛囊产生了类似于新鲜毛囊的多能 HAP 干细胞集落。这些发现表明,整个冷冻保存的人类毛囊保留了产生 HAP 干细胞的能力,这将使每个人都能够为个性化再生医学保存这些干细胞的库。