丙泊酚对兔脊髓缺血再灌注损伤血脊髓屏障的保护作用

摘要

Objective To investigate the effects of Propofol in blood spinal cord barrier (BSCB) disruption induced by spinal cord ischemia reperfusion injury (SCIRI). Methods 72 Japanese white rabbits were randomly assigned into 3 groups: sham-operation group (S); ischemia/reperfusion group (I/R) and Propofol treatment group (I/R + P). The Group S was separated the aorta without cross-clamping. SCIRI was induced in rabbits by infrarenal aortic occlusion for 30 minutes. Propofol was intravenously infused at 10 minutes before aortic clamping and at onset of reperfusion in the Group I/R + P. The Group S and Group I/R were intravenously infused 0.9%sodium chloride. Hind-limb motor function was assessed using Tarlov criteria, and histological observation by histological examination. The permeability of the BSCB was examined using EB as vascular tracers. The expression of MMP-9, claudin-5 and NF-κB were assessed by Western blot, RT-PCR. Results Propofol minimized the neuromotor dysfunction and histopathological deficits and attenuated EB extravasation. In addition, Propofol suppressed SCIRI-induced increase of MMP-9 and NF-κB. Finally, Propofol reduced the loss of claudin-5. Conclusion Propofol stabilizes the BSCB integrity after SCIRI. This beneficial effect is partly mediated by inhibition of MMP-9 and preservation claudin-5 and relates to inhibiting the NF-κB signal pathway.%目的：探讨丙泊酚对兔脊髓缺血再灌注损伤血脊髓屏障的保护作用。方法：72只日本大耳白兔随机分为3组：假手术组（Sham）、模型组（I／R）、丙泊酚组（I／R ＋ P）。 I／R和I／R＋P组阻断腹主动脉30 min。I／R ＋ P组于主动脉阻断前10 min和再灌注即刻泵注丙泊酚，另两组泵注生理盐水。再灌注24、48 h行神经功能评分，EB检测血脊髓屏障的通透性，Western blot，RT-PCR检测MMP-9、claudin-5、NF-κB表达，HE染色观察形态变化。结果：与Sham组相比，I／R组神经功能评分降低，屏障通透性增加，MMP-9、NF-κB表达增多， claudin-5表达减少（P＜0．05）；与I／R组相比，I／R＋P组神经功能评分增高，屏障通透性降低，MMP-9、NF-κB表达减少，claudin-5表达增多（P ＜0．05）。结论：丙泊酚对兔脊髓缺血再灌注损伤血脊髓屏障具有保护作用，其保护机制可能与抑制NF-κB信号通路，抑制MMP-9的表达，减少claudin-5的丢失有关。