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首页> 外文期刊>Journal of orthopaedic research >Activated protein C attenuates acute ischaemia reperfusion injury in skeletal muscle.
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Activated protein C attenuates acute ischaemia reperfusion injury in skeletal muscle.

机译:活化的蛋白C减轻了骨骼肌的急性缺血再灌注损伤。

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Activated protein C (APC) is an endogenous anti-coagulant with anti-inflammatory properties. The purpose of the present study was to evaluate the effects of activated protein C in the setting of skeletal muscle ischaemia reperfusion injury (IRI). IRI was induced in rats by applying rubber bands above the levels of the greater trochanters bilaterally for a period of 2h followed by 12h reperfusion. Treatment groups received either equal volumes of normal saline or activated protein C prior to tourniquet release. Following 12h reperfusion, muscle function was assessed electrophysiologically by electrical field stimulation. The animals were then sacrificed and skeletal muscle harvested for evaluation. Activated protein C significantly attenuated skeletal muscle reperfusion injury as shown by reduced myeloperoxidase content, wet to dry ratio and electrical properties of skeletal muscle. Further in vitro work was carried out on neutrophils isolated from healthy volunteers to determine the direct effect of APC on neutrophil function. The effects of APC on TNF-alpha stimulated neutrophils were examined by measuring CD18 expression as well as reactive oxygen species generation. The in vitro work demonstrated a reduction in CD18 expression and reactive oxygen species generation. We conclude that activated protein C may have a protective role in the setting of skeletal muscle ischaemia reperfusion injury and that this is in part mediated by a direct inhibitory effect on neutrophil activation.
机译:活化蛋白C(APC)是具有抗炎特性的内源性抗凝剂。本研究的目的是评估活化蛋白C在骨骼肌缺血再灌注损伤(IRI)中的作用。通过在双侧施加高于大转子水平的橡皮筋持续2h,然后再灌注12h,在大鼠中诱发IRI。在止血带释放之前,治疗组接受等体积的生理盐水或活化蛋白C。再灌注12h后,通过电场刺激以电生理方式评估肌肉功能。然后处死动物并收获骨骼肌用于评估。活化的蛋白C显着减轻了骨骼肌的再灌注损伤,如降低的髓过氧化物酶含量,干湿比和骨骼肌的电特性所表明。对从健康志愿者中分离的嗜中性白细胞进行了进一步的体外研究,以确定APC对嗜中性白细胞功能的直接作用。通过测量CD18的表达以及活性氧的产生,可以检查APC对TNF-α刺激的中性粒细胞的影响。体外研究表明CD18表达和活性氧的产生减少。我们得出结论,活化的蛋白C可能在骨骼肌缺血再灌注损伤的发生中起保护作用,并且这部分是由对中性粒细胞活化的直接抑制作用介导的。

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