地体酸可改善大鼠肝缺血再灌注损伤:涉及 TLR4、Nrf2 和 PI3K/Akt 信号通路。
Telluric acid ameliorates hepatic ischemia reperfusion-induced injury in rats: Involvement of TLR4, Nrf2, and PI3K/Akt signaling pathways.
机构信息
Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Κasr El-Aini Str., 11562 Cairo, Egypt.
Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Κasr El-Aini Str., 11562 Cairo, Egypt.
出版信息
Biochem Pharmacol. 2019 Oct;168:404-411. doi: 10.1016/j.bcp.2019.08.001. Epub 2019 Aug 3.
In past tellurium-based compounds had limited use, however, their therapeutic potential have been target of interest recently due to antioxidant and anti-inflammatory capabilities in experimental endotoxemia. Nevertheless, their potential hepatoprotective effect against ischemia reperfusion (IR) injury is still obscure. This study examined the possible hepatoprotective effect of telluric acid (TELL), one of tellurium-based compound, against the deteriorating effect hepatic IR injury in rats through directing toll like receptor-4 (TLR4) cascade, phosphoinositide 3-kinase(PI3K)/Akt axis, and nuclear erythroid-related factor-2 (Nrf-2) pathway as possible mechanisms contributed to TELL's effect. Indeed, male Wistar rats were randomized into 3 groups: sham-operated, control IR and TELL (50 µg/kg). TELL was administrated once daily for seven consecutive days prior to the IR induction. Pretreatment with TELL attenuated hepatic IR injury as manifested by hampered plasma aminotransaminases and lactate dehydrogenase activities. Also, TELL opposed IR induced elevation in tissue expression/activity of high-mobility group box protein-1 (HMGB1), TLR4, myeloid differentiation primary-response protein 88 (MyD88), phospho-nuclear factor-kappa B p65 (p-NF-κB p65), phospho-mitogen activated protein kinasep38 (p-MAPKp38) and tumor necrosis factor-alpha (TNF-α). Moreover, TELL reduced the elevated thiobarbituric acid reactive substances along with increased both Nrf-2 and endothelial nitric oxide synthase (eNOS) protein expression, beside replenishment of hepatic reduced glutathione. In addition, TELL induced obvious upregulation of p-PI3K and p-Akt protein expressions together with restoration of histopathological changes in IR injury. In conclusion, TELL purveyed conceivable novel hepatoprotective mechanisms and attenuated events associated with acute hepatic injury via inhibition of TLR4 downstream axis and activation of Nrf-2 and PI3K/Akt signaling cascades. Thus, TELL may provide a novel therapeutic potential for complications of hepatic IR injury.
在过去,碲基化合物的应用受到限制,但由于其在实验性内毒素血症中的抗氧化和抗炎能力,它们的治疗潜力最近成为了研究的焦点。然而,它们在缺血再灌注(IR)损伤中的潜在肝保护作用仍不清楚。本研究通过靶向 Toll 样受体 4(TLR4)级联、磷酸肌醇 3-激酶(PI3K)/Akt 轴和核红细胞相关因子 2(Nrf-2)途径,研究了碲酸(TELL)作为一种碲基化合物对大鼠肝 IR 损伤的潜在肝保护作用,这些途径可能是 TELL 作用的机制。事实上,雄性 Wistar 大鼠随机分为 3 组:假手术组、对照组 IR 和 TELL(50μg/kg)。TELL 在 IR 诱导前连续 7 天每天给药一次。TELL 预处理可减轻肝 IR 损伤,表现为血浆氨基转移酶和乳酸脱氢酶活性降低。此外,TELL 还可拮抗 IR 诱导的高迁移率族蛋白 B1(HMGB1)、TLR4、髓样分化初级反应蛋白 88(MyD88)、磷酸核因子-κB p65(p-NF-κB p65)、磷酸化丝裂原激活蛋白激酶 p38(p-MAPKp38)和肿瘤坏死因子-α(TNF-α)的组织表达/活性升高。此外,TELL 降低了丙二醛反应性物质的升高,同时增加了 Nrf-2 和内皮型一氧化氮合酶(eNOS)的蛋白表达,同时补充了肝还原型谷胱甘肽。此外,TELL 诱导了 p-PI3K 和 p-Akt 蛋白表达的明显上调,并恢复了 IR 损伤的组织病理学变化。总之,TELL 通过抑制 TLR4 下游轴和激活 Nrf-2 和 PI3K/Akt 信号级联,提供了一种有前景的新的肝保护机制,并减轻了与急性肝损伤相关的事件。因此,TELL 可能为肝 IR 损伤的并发症提供一种新的治疗潜力。