基于SPHK1/S1P信号通路探讨灰树花提取物对溃疡性结肠炎大鼠肠道炎症反应的影响  

Exploring effect of grifola frondosa extract on intestinal inflammatory response in rats with ulcerative colitis based on SPHK1/S1P signaling pathway

作　　者：杜晗 金雪 马贤德[1] 雷萍[1] 董墨思 陈杰 许欣竹 张雨晴 韩晓伟[1] DU Han;JIN Xue;MA Xiande;LEI Ping;DONG Mosi;CHEN Jie;XU Xinzhu;ZHANG Yuqing;HAN Xiaowei(Liaoning University of Traditional Chinese Medicine,Shenyang 110847,China)

机构地区：[1]辽宁中医药大学,沈阳110847

出　　处：《中国免疫学杂志》2025年第4期847-853,共7页Chinese Journal of Immunology

基　　金：国家自然科学基金(81403208)。

摘　　要：目的:探讨灰树花提取物通过鞘氨醇激酶1(SPHK1)/鞘氨醇-1-磷酸(S1P)信号通路改善溃疡性结肠炎(UC)大鼠结肠组织炎症反应的免疫机制。方法:将40只雄性SD大鼠随机分为5组,即空白组、模型组、柳氮磺吡啶治疗组(SASP组)、灰树花提取物治疗组(GF组)、柳氮磺吡啶联合灰树花提取物治疗组(SASP+GF组)。应用3%葡聚糖硫酸钠(DSS)自由饮用法建立UC模型。1周后,各治疗组分别进行柳氮磺吡啶0.3 g(/kg·d)、灰树花提取物10 mg(/kg·d)以及两种药物联合灌胃治疗。实验期间观察大鼠一般状态,统计疾病活动指数(DAI)评分,免疫组化法检测大鼠结肠组织SPHK1、S1P、肿瘤坏死因子受体相关因子2(TRAF2)、TNF-α的蛋白含量及阳性表达水平;RT-qPCR法及Western blot法检测大鼠结肠组织中SPHK1、S1P、TRAF2、TNF-αmRNA和蛋白表达水平。结果:与空白组相比,模型组大鼠一般状态欠佳,DAI评分显著升高,结肠组织SPHK1、S1P、TRAF2和TNF-α蛋白阳性表达、mRNA及蛋白表达水平均显著升高(P<0.01)。与模型组相比,各治疗组大鼠一般状态明显好转,DAI评分降低(P<0.01),各目标蛋白阳性表达均显著降低(P<0.01),其中GF组与SASP+GF组下降更为明显;SPHK1和TRAF2 mRNA及蛋白表达水平均有不同程度降低(P<0.01或P<0.05),而S1P和TNF-αmRNA及蛋白表达水平在GF组和SASP+GF组下降明显(P<0.01)。与SASP组相比,GF组仅SPHK1蛋白表达、TNF-αmRNA及蛋白表达水平降低,而SASP+GF组数据均显著降低(P<0.01或P<0.05)。与GF组相比,SASP+GF组SPHK1蛋白阳性表达及含量、S1P mRNA表达水平和TNF-α蛋白含量均显著降低(P<0.05或P<0.01)。结论:灰树花提取物可能通过抑制SPHK1/S1P通路激活,减轻UC大鼠结肠组织炎症反应,恢复肠黏膜屏障功能,改善UC症状。Objective:To investigate the immunological mechanism by which grifola frondosa extract improves colonic tissue inflammation in rats with ulcerative colitis(UC)through the sphingosine kinase 1(SPHK1)/sphingosine-1-phosphate(S1P)signaling pathway.Methods:Forty male SD rats were randomly divided into five groups:blank group,model group,sulfasalazine treatment group(SASP group),grifola frondosa extract treatment group(GF group),and sulfasalazine combined with grifola frondosa extract treatment group(SASP+GF group).UC model was established using a 3%dextran sulfate sodium(DSS)free drinking method.After one week,each treatment group received sulfasalazine 0.3 g(/kg·d),grifola frondosa extract 10 mg(/kg·d),and combination of both drugs by gavage.During the experiment,the general condition of the rats was observed,the disease activity index(DAI)score was recorded and the protein content and positive expression levels of SPHK1,S1P,tumor necrosis factor receptor-associated factor 2(TRAF2)and TNF-αin rat colon tissue were detected by immunohistochemistry.mRNA and protein expression levels of SPHK1,S1P,TRAF2 and TNF-αin rat colon tissue were measured by RT-qPCR and Western blot.Results:Compared with the blank group,the general condition of the model group rats were poor,the DAI score was significantly increased,and the protein positive expression,mRNA and protein expression levels of SPHK1,S1P,TRAF2 and TNF-αin colon tissue were significantly increased(P<0.01).Compared with the model group,the general condition of the rats in each treatment group improved significantly,the DAI score was decreased(P<0.01),and the positive expression of each target protein was significantly reduced(P<0.01),especially in the GF group and SASP+GF group;the mRNA and protein expression levels of SPHK1 and TRAF2 were reduced to varying degrees(P<0.01 or P<0.05),while the mRNA and protein expression levels of S1P and TNF-αonly decreased significantly in the GF group and SASP+GF group(P<0.01).Compared with the SASP group,the GF group only showe

关 键 词：灰树花提取物 溃疡性结肠炎 SPHK1 S1P 黏膜 免疫机制 

分 类 号：R285.5[医药卫生—中药学]