Lim Chae Ho, Kaminaka Annette, Lee Soung-Hoon, Moore Simone, Cronstein Bruce N, Rabbani Piul S, Ito Mayumi
Ronald O. Perelman Department of Dermatology, NYU Grossman School of Medicine, New York, New York, USA; Department of Cell Biology, NYU Grossman School of Medicine, New York, New York, USA.
Ronald O. Perelman Department of Dermatology, NYU Grossman School of Medicine, New York, New York, USA; Department of Cell Biology, NYU Grossman School of Medicine, New York, New York, USA.
J Invest Dermatol. 2025 Jan;145(1):42-49.e2. doi: 10.1016/j.jid.2024.04.025. Epub 2024 May 27.
Hair follicle neogenesis (HFN) occurs after large skin excisions in mice, serving as a rare regenerative model in mammalian wound healing. Wound healing typically results in fibrosis in mice and humans. We previously showed that small skin excisions in mice result in scarring devoid of HFN, displaying features of nonregenerative healing, and hedgehog (Hh) activation in the dermis of such wounds can induce HFN. In this study, we sought to verify the role of dermal Wnt/β-catenin signaling in HFN because this pathway is essential for hair follicle development but is also paradoxically well-characterized in fibrosis of adult wounds. By deletion of β-catenin in large wound myofibroblasts, we show that Wnt/β-catenin signaling is required for endogenous mechanisms of HFN. By utilizing a combined mouse model that simultaneously induces deletion of β-catenin and constitutive activation of Smoothened in myofibroblasts, we also found that β-catenin is required for Hh-driven dermal papilla formation. Transcriptome analysis confirms that Wnt/β-catenin and Hh pathways are activated in dermal papilla cells. Our results indicate that Wnt-active fibrotic status may also create a permissive state for the regenerative function of Hh, suggesting that activation of both Wnt and Hh pathways in skin wound fibroblasts must be ensured in future strategies to promote HFN.
毛囊新生(HFN)在小鼠大面积皮肤切除后发生,是哺乳动物伤口愈合中一种罕见的再生模型。伤口愈合在小鼠和人类中通常会导致纤维化。我们之前表明,小鼠小面积皮肤切除会导致无HFN的瘢痕形成,表现出非再生性愈合的特征,而此类伤口真皮中的刺猬信号通路(Hh)激活可诱导HFN。在本研究中,我们试图验证真皮Wnt/β-连环蛋白信号通路在HFN中的作用,因为该通路对毛囊发育至关重要,但在成人伤口纤维化中也有矛盾的充分表征。通过在大伤口肌成纤维细胞中缺失β-连环蛋白,我们表明Wnt/β-连环蛋白信号通路是HFN内源性机制所必需的。通过利用一种联合小鼠模型,该模型同时诱导肌成纤维细胞中β-连环蛋白的缺失和平滑肌蛋白的组成性激活,我们还发现β-连环蛋白是Hh驱动的真皮乳头形成所必需的。转录组分析证实Wnt/β-连环蛋白和Hh通路在真皮乳头细胞中被激活。我们的结果表明,Wnt激活的纤维化状态也可能为Hh的再生功能创造一个允许状态,这表明在未来促进HFN的策略中,必须确保皮肤伤口成纤维细胞中Wnt和Hh通路均被激活。