Institute of Regenerative Medicine, Affiliated Hospital of Jiangsu University, Jiangsu University, Zhenjiang 212001, China.
Department of Dermatology, Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China.
Cells. 2021 Dec 27;11(1):70. doi: 10.3390/cells11010070.
Amniotic epithelial stem cells (AESCs) are considered as potential alternatives to keratinocytes (KCs) in tissue-engineered skin substitutes used for treating skin damage. However, their clinical application is limited since similarities and distinctions between AESCs and KCs remain unclear. Herein, a transcriptomics analysis and functional evaluation were used to understand the commonalities and differences between AESCs and KCs. RNA-sequencing revealed that AESCs are involved in multiple epidermis-associated biological processes shared by KCs and show more similarity to early stage immature KCs than to adult KCs. However, AESCs were observed to be heterogeneous, and some possessed hybrid mesenchymal and epithelial features distinct from KCs. A functional evaluation revealed that AESCs can phagocytose melanosomes transported by melanocytes in both 2D and 3D co-culture systems similar to KCs, which may help reconstitute pigmented skin. The overexpression of TP63 and activation of NOTCH signaling could promote AESC stemness and improve their differentiation features, respectively, bridging the gap between AESCs and KCs. These changes induced the convergence of AESC cell fate with KCs. In future, modified reprogramming strategies, such as the use of small molecules, may facilitate the further modulation human AESCs for use in skin regeneration.
羊膜上皮干细胞(AESCs)被认为是用于治疗皮肤损伤的组织工程皮肤替代物中角质细胞(KCs)的潜在替代品。然而,由于 AESCs 和 KCs 之间的相似性和区别尚不清楚,其临床应用受到限制。在此,通过转录组学分析和功能评估来了解 AESCs 和 KCs 之间的共同点和差异。RNA-seq 显示,AESCs 参与了与 KCs 共享的多个表皮相关的生物学过程,与早期未成熟的 KCs 比与成年 KCs 更相似。然而,观察到 AESCs 是异质的,有些具有与 KCs 不同的混合间充质和上皮特征。功能评估表明,AESCs 可以像 KCs 一样在 2D 和 3D 共培养系统中吞噬黑素细胞运输的黑色素体,这可能有助于重建色素沉着的皮肤。TP63 的过表达和 NOTCH 信号的激活分别可以促进 AESC 的干性和改善其分化特征,从而在 AESCs 和 KCs 之间架起桥梁。这些变化诱导 AESC 细胞命运与 KCs 的趋同。在未来,经过修饰的重编程策略,如使用小分子,可能有助于进一步调节人 AESCs 用于皮肤再生。
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