Intelligent Synthetic Biology Center, Daejeon 34141, Republic of Korea.
Intelligent Synthetic Biology Center, Daejeon 34141, Republic of Korea; Department of Biological Sciences, KAIST, Daejeon 34141, Republic of Korea.
Biochem Biophys Res Commun. 2018 May 5;499(2):381-388. doi: 10.1016/j.bbrc.2018.03.170. Epub 2018 Mar 26.
Cellular senescence suppresses cancer by inducing irreversible cell growth arrest. Nevertheless, senescent cells is proposed as causal link with aging and aging-related pathologies. The physiological beneficial functions of senescent cells are still of paucity. Here we show that senescent human dermal fibroblast accelerates keratinocytes scratch wound healing and stimulates differentiation of fibroblast. Using oxidative stress (100 μM HO exposure for 1 h) induction, we successfully triggered fibroblast senescence and developed senescence associated secretory phenotype (SASP). The induction of SASP was regulated by p38MAPK/MSK2/NF-κB pathway. Interestingly, inhibition of p38MAPK activation only partially suppressed SASP. However, SASP was significantly inhibited by SB747651A, a specific MSK inhibitor. Additionally, we demonstrate that SASP stimulates migration of keratinocytes and myofibroblast transition of fibroblast, through fold-increased secretion of growth factors, platelet-derived growth factor AA (PDGF-AA) and AB (PDGF-AB), transforming growth factor beta 1 (TGF-β1) and beta 2 (TGF-β2), vascular endothelial growth factor A (VEGF-A) and D (VEGF-D), vascular endothelial growth factor receptor 2 (VEGFR2) and 3 (VEGFR3). Importantly, we also confirmed ginsenoside Rb1 promoted SASP-mediated healing process via p38MAPK/MSK2/NF-κB pathway. The results pointed to senescent fibroblast as a potential mechanism of wound healing control in human skin. Further, it provided a candidate targeted for wound therapy.
细胞衰老通过诱导不可逆的细胞生长停滞来抑制癌症。然而,衰老细胞被认为是与衰老和与衰老相关的病理相关的因果关系。衰老细胞的生理有益功能仍然很少。在这里,我们显示衰老的人真皮成纤维细胞加速角质形成细胞划痕伤口愈合,并刺激成纤维细胞分化。通过氧化应激(100 μM HO 暴露 1 小时)诱导,我们成功地触发了成纤维细胞衰老并发展出衰老相关分泌表型(SASP)。SASP 的诱导受 p38MAPK/MSK2/NF-κB 途径调节。有趣的是,抑制 p38MAPK 激活仅部分抑制了 SASP。然而,通过 p38MAPK 的特异性抑制剂 SB747651A,SASP 显著受到抑制。此外,我们证明 SASP 通过折叠增加生长因子、血小板衍生生长因子 AA(PDGF-AA)和 AB(PDGF-AB)、转化生长因子β 1(TGF-β1)和β 2(TGF-β2)、血管内皮生长因子 A(VEGF-A)和 D(VEGF-D)、血管内皮生长因子受体 2(VEGFR2)和 3(VEGFR3)的分泌,刺激角质形成细胞的迁移和成纤维细胞的肌成纤维细胞转化。重要的是,我们还通过 p38MAPK/MSK2/NF-κB 途径证实了人参皂苷 Rb1 促进了 SASP 介导的愈合过程。结果表明衰老的成纤维细胞是人类皮肤伤口愈合控制的潜在机制。此外,它为伤口治疗提供了一个候选靶向。