Center for Wound Healing and Tissue Regeneration, University of Illinois at Chicago, Chicago, IL, United States of America.
Guangdong Provincial Key Laboratory of Stomatology, Stomatological Hospital, Guanghua School of Stomatology, SunYat-sen University, Guangzhou, Guangdong, China.
PLoS One. 2020 Apr 23;15(4):e0231962. doi: 10.1371/journal.pone.0231962. eCollection 2020.
Vascular deficits are a fundamental contributing factor of diabetes-associated diseases. Although previous studies have demonstrated that the pro-angiogenic phase of wound healing is blunted in diabetes, a comprehensive understanding of the mechanisms that regulate skin revascularization and capillary stabilization in diabetic wounds is lacking. Using a mouse model of diabetic wound healing, we performed microCT analysis of the 3-dimensional architecture of the capillary bed. As compared to wild type, vessel surface area, branch junction number, total vessel length, and total branch number were significantly decreased in wounds of diabetic mice as compared to WT mice. Diabetic mouse wounds also had significantly increased capillary permeability and decreased pericyte coverage of capillaries. Diabetic wounds exhibited significant perturbations in the expression of factors that affect vascular regrowth, maturation and stability. Specifically, the expression of VEGF-A, Sprouty2, PEDF, LRP6, Thrombospondin 1, CXCL10, CXCR3, PDGFR-β, HB-EGF, EGFR, TGF-β1, Semaphorin3a, Neuropilin 1, angiopoietin 2, NG2, and RGS5 were down-regulated in diabetic wounds. Together, these studies provide novel information about the complexity of the perturbation of angiogenesis in diabetic wounds. Targeting factors responsible for wound resolution and vascular pruning, as well those that affect pericyte recruitment, maturation, and stability may have the potential to improve diabetic skin wound healing.
血管缺陷是糖尿病相关疾病的一个基本致病因素。尽管先前的研究表明糖尿病患者伤口愈合的促血管生成阶段受到了抑制,但对于调节糖尿病伤口皮肤再血管化和毛细血管稳定的机制还缺乏全面的了解。我们使用糖尿病伤口愈合的小鼠模型,对毛细血管床的三维结构进行了 microCT 分析。与野生型相比,糖尿病小鼠伤口中的血管表面积、分支连接数、总血管长度和总分支数明显低于 WT 小鼠。糖尿病小鼠伤口的毛细血管通透性也显著增加,周细胞对毛细血管的覆盖减少。糖尿病伤口中影响血管再生、成熟和稳定的因子的表达也出现了显著的紊乱。具体而言,VEGF-A、Sprouty2、PEDF、LRP6、血栓素 1、CXCL10、CXCR3、PDGFR-β、HB-EGF、EGFR、TGF-β1、Semaphorin3a、Neuropilin 1、血管生成素 2、NG2 和 RGS5 的表达在糖尿病伤口中下调。总之,这些研究为糖尿病伤口中血管生成紊乱的复杂性提供了新的信息。针对负责伤口愈合和血管修剪的因子,以及影响周细胞募集、成熟和稳定性的因子,可能有潜力改善糖尿病皮肤伤口愈合。
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