Linnemann Caren, Sahin Filiz, Chen Yangmengfan, Falldorf Karsten, Ronniger Michael, Histing Tina, Nussler Andreas K, Ehnert Sabrina
Siegfried Weller Institute for Trauma Research, BG Unfallklinik Tübingen, Eberhard Karls Universität Tuebingen, Schnarrenbergstraße 95, 72076 Tuebingen, Germany.
Sachtleben GmbH, Haus Spectrum am UKE, Martinistraße 64, 20251 Hamburg, Germany.
Int J Mol Sci. 2023 Sep 27;24(19):14629. doi: 10.3390/ijms241914629.
Fracture-healing is a highly complex and timely orchestrated process. Non-healing fractures are still a major clinical problem and treatment remains difficult. A 16 Hz extremely low-frequency pulsed electromagnetic field (ELF-PEMF) was identified as non-invasive adjunct therapy supporting bone-healing by inducing reactive oxygen species (ROS) and Ca-influx. However, ROS and Ca-influx may stimulate neutrophils, the first cells arriving at the wounded site, to excessively form neutrophil extracellular traps (NETs), which negatively affects the healing process. Thus, this study aimed to evaluate the effect of this 16 Hz ELF-PEMF on NET formation. Neutrophils were isolated from healthy volunteers and exposed to different NET-stimuli and the 16 Hz ELF-PEMF. NETs were quantified using Sytox Green Assay and immunofluorescence, Ca-influx and ROS with fluorescence probes. In contrast to mesenchymal cells, ELF-PEMF exposure did not induce ROS and Ca-influx in neutrophils. ELF-PEMF exposure did not result in basal or enhanced PMA-induced NET formation but did reduce the amount of DNA released. Similarly, NET formation induced by LPS and HO was reduced through exposure to ELF-PEMF. As ELF-PEMF exposure did not induce NET release or negatively affect neutrophils, the ELF-PEMF exposure can be started immediately after fracture treatment.
骨折愈合是一个高度复杂且精心编排的过程。骨折不愈合仍是一个主要的临床问题,治疗仍然困难。16赫兹极低频脉冲电磁场(ELF-PEMF)被确定为一种非侵入性辅助治疗手段,可通过诱导活性氧(ROS)和钙内流来支持骨愈合。然而,ROS和钙内流可能刺激最早到达创伤部位的中性粒细胞过度形成中性粒细胞胞外陷阱(NETs),这对愈合过程产生负面影响。因此,本研究旨在评估这种16赫兹ELF-PEMF对NET形成的影响。从健康志愿者中分离出中性粒细胞,并使其暴露于不同的NET刺激物和16赫兹ELF-PEMF中。使用Sytox Green检测法和免疫荧光对NETs进行定量,使用荧光探针检测钙内流和ROS。与间充质细胞不同,ELF-PEMF暴露并未在中性粒细胞中诱导ROS和钙内流。ELF-PEMF暴露并未导致基础或增强的佛波酯(PMA)诱导的NET形成,但确实减少了DNA释放量。同样,脂多糖(LPS)和过氧化氢(HO)诱导的NET形成通过暴露于ELF-PEMF而减少。由于ELF-PEMF暴露不会诱导NET释放或对中性粒细胞产生负面影响,因此在骨折治疗后可立即开始ELF-PEMF暴露。
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