哮喘大鼠IKK/NF-κB信号通道与抗氧化性的关系及银杏叶提取物的调控

目的:探讨哮喘大鼠IKK/NF-κB信号通道与丙二醛（MDA）、还原型谷胱甘肽（GSH）的关系及银杏叶提取物（Egb）的调控。 方法:36只SD雄性大鼠随机分为正常组（C组）、哮喘组（A组）、Egb组（E组）。用原位杂交法和免疫组化检测肺组织IκB激酶mRNA（IKKβ mRNA）及核转录因子（NF-κB）P65亚基活性；硫代巴比妥酸法和二硝基苯甲酸法测定血清及支气管肺泡灌洗液（BALF）中的MDA和GSH的浓度。 结果:A组肺组织IKKβ mRNA及NF-κB P65表达均显著高于C组（均P＜0.01），E组则均显著低于A组（均P＜0.01）；A组血清及BALF中MDA浓度显著高于C组（均P<0.01），E组则显著低于A组（均P<0.01）；A组血清及BALF中GSH的浓度显著低于C组（均P<0.01），E组则显著高于A组（均P<0.01）。 结论:哮喘大鼠肺组织IKKβ mRNA、NF-κB P65表达显著增强，与抗氧化性降低有关，Egb能有效抑制IKK/NF-κB信号通道。

Correlation between the signal pathway IKK/NF -κB and the anti -oxidant activity in asthma rats and the modulation of Ginkgo biloba extract

AIM:To investigate the correlation between the signal pathway of IKK/NF-κB and the anti-oxidant activity in asthmatic rats and the modulation of Ginkgo biloba extract (Egb). METHODS:Thirty-six male SD rats were randomly divided into three groups:control group (group C), asthmatic group (group A) and Egb group(group E). Asthma in rats was established by ovalbumin (OVA) challenge methods. The mRNA of IKKβ and the protein of NF-κB P65 in lung tissue were assessed by using in situ hybridization with oligonucleotide probe and immunohistochemisty, respectively. RESULTS:The expression of IKKβ mRNA and NF-κB P65 protein in group A were significantly increased when compared with group C (P＜0.01, respectively), but those data in group E were significantly decreased when compared with group A (P＜0.01, respectively). The concentrations of MDA in serum and BLAF in group A were significantly higher than those in control group (P＜0.01，respectively), but the concentrations of MDA in group E were significantly lower than those in group A (P＜0.01, respectively). The concentrations of GSH in group A were significantly lower than those in group C (P＜0.01, respectively), but the concentrations of GSH in group E were significantly higher than those in group A (P＜0.01, respectively). CONCLUSION:The expression of IKKβ mRNA and NF-κB P65 protein were increased significantly in asthmatic rats. This was possibly attributed to the decreased anti-oxidant activity. Egb increased the anti-oxidant activity and inhibited the activity of IKK/NF-κB.