Lu Fanglin, Kato Jungo, Toramaru Tomoko, Zhang Mengting, Morisaki Hiroshi
Keio University Graduate School of Medicine Doctoral Programs, Tokyo, Japan.
Department of Anesthesiology, Keio University School of Medicine, Tokyo, Japan.
J Pain Res. 2023 Feb 21;16:573-587. doi: 10.2147/JPR.S397054. eCollection 2023.
PURPOSE: The involvement of hypoxic response mechanisms in local functional impairments in surgical wounds is unclear. In the present study, we characterized tissue hypoxia in surgical wounds and investigated the role of pharmacological ischemic conditioning (PIC) using roxadustat, an oral prolyl hydroxylase domain enzyme inhibitor, in postoperative local functional impairments in a murine model of deep hind paw incision. METHODS: Male BALB/cAJcl mice aged 9-13 weeks were used in all experiments. Plantar skins of mice that underwent surgical incision were subjected to immunohistochemistry to localise tissue hypoxia. Pain-like behaviours and sudomotor function were compared between mice treated with 6-week perioperative PIC and control mice. The effects of PIC were examined in vitro by immunocytochemistry using sympathetically differentiated PC12 cells and in vivo by immunohistochemistry using plantar skins collected on postoperative day 21. RESULTS: Prominent tissue hypoxia was detected within axons in the nerve bundles underneath surgical wounds. Six-week perioperative PIC using roxadustat failed to ease spontaneous pain-like behaviors; however, it mitigated local sudomotor impairment postoperatively. Upregulation of sympathetic innervation to the eccrine glands was observed in the PIC-treated skins collected on postoperative day 21, in accordance with the in vitro study wherein roxadustat promoted neurite growth of sympathetically differentiated PC12 cells. CONCLUSION: This study suggests that tissue hypoxia is involved in the pathogenesis of local sudomotor dysfunction associated with surgical trauma. Targeting the hypoxic response mechanisms with PIC may be of therapeutic potential in postsurgical local sympathetic impairments that can be present in complex regional pain syndrome.
目的:缺氧反应机制在手术伤口局部功能障碍中的作用尚不清楚。在本研究中,我们对手术伤口中的组织缺氧进行了特征描述,并研究了使用口服脯氨酰羟化酶结构域酶抑制剂罗沙司他进行药理学缺血预处理(PIC)在小鼠后足深部切口模型术后局部功能障碍中的作用。 方法:所有实验均使用9 - 13周龄的雄性BALB/cAJcl小鼠。对接受手术切口的小鼠足底皮肤进行免疫组织化学以定位组织缺氧。比较围手术期接受6周PIC治疗的小鼠与对照小鼠的疼痛样行为和汗腺运动功能。通过使用交感神经分化的PC12细胞进行免疫细胞化学在体外检查PIC的作用,并通过使用术后第21天收集的足底皮肤进行免疫组织化学在体内检查PIC的作用。 结果:在手术伤口下方神经束的轴突内检测到明显的组织缺氧。使用罗沙司他进行6周围手术期PIC未能减轻自发疼痛样行为;然而,它减轻了术后局部汗腺运动功能障碍。在术后第21天收集的PIC治疗的皮肤中观察到对汗腺的交感神经支配上调,这与体外研究一致,即罗沙司他促进交感神经分化的PC12细胞的神经突生长。 结论:本研究表明组织缺氧参与了与手术创伤相关的局部汗腺运动功能障碍的发病机制。用PIC靶向缺氧反应机制可能对复杂区域疼痛综合征中可能出现的术后局部交感神经损伤具有治疗潜力。
Anesthesiology. 2007-7
JCI Insight. 2021-9-22