高温复合脂多糖应激大鼠肾组织TNF-α表达变化

目的 探讨高温与脂多糖(LPS)复合应激大鼠肾组织TNF-α的表达特点.方法 雄性SPF级Wistar大鼠随机分为常温+生理盐水组(C组)、高温+生理盐水组(H组)、常温+LPS组(L组)、高温+LPS组(HL组).置动物于模拟气候舱,HL组、H组暴露环境干球温度(dry bulb temperature,Tdb)为(35.0±0.5)℃,L组和C组Tdb为(26+0.5)℃;HL组和L组动物经尾静脉iv LPS 10 mg/kg,H组和C组动物经尾静脉iv 9g/LNaCl 10 ml/kg.应激120 min时,免疫组织化学SABC染色法检测动物肾组织TNF-α的表达特点,并做常规病理学检查.结果 高温与LPS复合应激组肾组织TNF-α的表达显著增强,肾损伤程度加重.结论 高温与LPS复合应激造成的肾毒性与肾TNF-α表达密切相关.

Abstract：

Objective To investigate the effects of co-exposure of LPS and heat on TNF-α expression in rat kidneys. Methods Male pathogen-free Wistar rats were randomly assigned in saline-injected normothermic control (C group), saline-injected heat exposure (H group), LPS-injected normothermic control (L group), and LPS-injected heat exposure (HL group). The rats in H and HL groups were exposed in a chamber at an ambient dry bulb temperature (Tdb) of 35.0±0.5 degrees, and those in C and L groups were exposed to a Tdb of 26±0.5 degrees. The rats in L and HL groups were given an intravenous injection of LPS (10 mg/kg) via the tail vein to induce endotoxemia, and equivalent normal saline was injected in C and H groups. TNF-α expression in the kidney was detected by immunohistochemical SABC method, and the renal damage was evaluated histologically at 120 min after the treatment. Results Co-exposure of the rats with LPS and heat caused significantly enhanced TNF-α expression and histopathological damage in the kidneys. Conclusion LPS combined with heat exposure causes renal toxicity, while is closely associated with the expression of TNF-α in the kidneys.