硫化氢在ob/ob小鼠皮肤创面愈合中的作用与调控机制

目的:观察硫化氢(H2S)对ob/ob小鼠皮肤创面愈合的影响并探讨其作用机制。方法:将ob/ob小鼠随机分为生理盐水组、胰岛素组和NaHS(H2S供体)组,C57BL/6小鼠作为对照组,构建小鼠背部皮肤创面模型。干预后检测各组H2S释放量;用Western blot检测胱硫醚γ-裂解酶(CSE)及基质金属蛋白酶-9(MMP-9)蛋白的表达差异;用RT-qPCR检测CSE的mRNA表达变化;使用免疫组织化学法检测中性粒细胞及单核/巨噬细胞的浸润数量;使用ELISA检测肿瘤坏死因子(TNF)-α和白细胞介素(IL)-6的水平;用Masson染色检测胶原沉积情况。结果:ob/ob小鼠皮肤创面肉芽组织中H2S释放及CSE蛋白、mRNA的表达水平以及胶原沉积显著低于C57BL/6小鼠(P0.05)。外源性H2S可加速ob/ob小鼠皮肤创面愈合(P0.05),增加胶原沉积。ob/ob小鼠创面中性粒细胞及单核/巨噬细胞浸润数量,TNF-α、IL-6的水平及MMP-9蛋白表达水平显著增加(P0.05),NaHS组显著降低。结论:H2S可显著改善糖尿病难愈性溃疡的愈合,作用机制可能与其抗炎作用有关。

Effects of hydrogen sulfide on impaired wound healing in ob/ob mice

AIM: To investigate the role of hydrogen sulfide(H₂S) on impaired wound healing in ob/ob mice and the underlying mechanism.METHODS: The ob/ob mice were randomly divided into 3 groups, including vehicle, insulin and NaHS for treatment. C57BL/6 mice were treated with vehicle as control. Full-thickness punch biopsy wounds were created on the mice. Firstly, H₂S concentrations in the skins and granulation tissues were measured. The mRNA expression of cystathionine γ-lyase(CSE) was detected by RT-qPCR. The protein expression of CSE and MMP-9 were determined by Western blot. The neutrophil and monocyte/macrophage infiltration was analyzed by immunohistochemistry me-thod. The levels of tumor necrosis factor(TNF)-α and interleukin(IL)-6 were measured by ELISA.Collagen formation was measured by Masson staining.RESULTS: The H₂S levels in the skin and granulation were significantly decreased in ob/ob mice and increased in the NaHS-treated mice(P<0.05). CSE expression at mRNA and protein levels was significantly decreased in ob/ob mice compared with the control mice(P<0.05). The wound healing period was significantly shorter in NaHS group than that in vehicle-treated ob/ob mice group(P<0.05), in which the insulin group had no difference with vehicle ob/ob mice group. The neutrophil and monocyte/macrophage infiltration, and TNF-α and IL-6 levels were significantly increased in ob/ob groups, but were decreased in NaHS group(P<0.01 or P<0.05). Meanwhile, NaHS increased collagen formation in the granulation tissues of ob/ob mice.CONCLUSION: H₂S/CSE down-regulation contributes to impaired wound healing in diabetes, which is alleviated by exogenous H₂S possibly through anti-inflammation.