摘要
体外观察了过氧化亚油酸(LOOH)对淋巴细胞的影响,并进一步观察烧伤后体内过氧化脂质(LPO)水平变化及淋巴细胞功能变化,以探讨烧伤免疫抑制的机制。体外实验采用正常小鼠脾淋巴细胞与LOOH一起培养或温育,测定增殖反应、IL-2及LPO。体内实验采用小鼠11％～12％TBSA III度烧伤模型测定脾淋巴细胞功能以及血浆、肝、脾中LPO。结果表明:LOOH可抑制淋巴细胞增殖反应及IL-2生成、诱发淋巴细胞脂质过氧化,Vit E可减轻LOOH的这些作用;烧伤后体内LPO水平明显升高、脾淋巴细胞增殖反应及IL-2生成明显降低,Vit E组或SOD组的这些变化与正常组相比,无显著性差别。提示:烧伤后体内脂质过氧化亢进以及LPO增多可能是烧伤免疫抑制的机制之一。
Purpose: Mechanisms of postburn immunosuppression are complicated and remain unclear. In the present experiment the effect of linoleic acid hydroperoxide (LOOH) on lymphocytes was evaluated in vitro, and then the changes in postburn lipid peroxie (LPO) levels and lymphocyte functions were measured, in order to investigate the mechanism of immunosepression following burn. Methods: Proliferation and IL-2 production and LPO of lymphocytes were assayed after the incubation with LOOH for in vitro study. On day 6 after induction of 11%~12% TBSA full-thickness burn, the ani- mals were sacrificed. and proliferation and IL-2 production of splenic lymphocytes, LPO leves of the plasma, livers and spleens were measured. Results: LOOH inhibited proliferation and IL-2 production and induced lipid peroxidation of lymphocytes in vitro, and Vit E could attenuate the effects of LOOH. LPO levels increased and proliferation and IL-2 production decreased after burn, but those changes in Vit E or SOD group showed no statistical significance compared with normal control group. Conclusion: En- hancement of lipid peroxidation and increased LPO after burn may be one of the mecha- nisms of postburn immunosuppression.
