糖尿病大鼠肺泡巨噬细胞TLR4的表达及对LPS反应性的研究

目的 观察糖尿病大鼠肺泡巨噬细胞Toll样受体4(TLR4)的表达水平及其对脂多糖(LPS)反应性的变化,探讨该变化在糖尿病机体防御病原体感染中的作用.方法 将32只Wistar雄性大鼠用随机数字表法分为正常组(A组)、糖尿病组(B组)、正常+LPS组(C组)及糖尿病+LPS组(D组).用免疫细胞化学染色法、RT-PCR及Western blot方法检测各组大鼠肺泡巨噬细胞TLR4表达的变化.结果 B组及C组大鼠肺泡巨噬细胞TLR4表达与A组相比均明显增高(P<0.001);D组大鼠肺泡巨噬细胞TLR4表达较B组及C组升高更为明显(P<0.001).结论 与正常大鼠相比,糖尿病大鼠肺泡巨噬细胞TLR4表达明显增高,LPS刺激后其增高更加显著,提示糖尿病机体处于促炎症状态,相关的机制尚有待深入的研究.

Expression of Toll-like receptor 4 in alveolar macrophages of diabetic rats and response to LPS

Objective To investigate the altered expression of TLR4 in alveolar macrophages of diabetic rats after lipopolysaccharide (LPS) stimulation and the effect of these changes on defending the infection. Methods Thirty-two male Wistar rats were divided into 4 groups, group A: the control group; group B: the diabetic group; group C: the LPS stimulated group; and group D: the diabetic group with LPS stimulation. TLR4 in alveolar macrophages were measured by immunocytochemistry, RT-PCR and Western blot analysis. Results The expressions of TLR4 in group B and group C were higher than that in group A (P < 0. 001). The expression of TLR4 in group D was obviously higher than that of group B and group C (P < 0.001). Conclusion The expression of TLR4 of diabetic rats was higher than that of normal rats and became more higher after LPS stimulation, which is indicated that diabetic bodies were in the proinflammatory state, the mechanism remains to be explored in detail.