【论文摘要】该实验旨在比较茅苍术生品和麸炒品对实验性胃溃疡大鼠的抗炎作用,初步探讨茅苍术抗胃溃疡的作用机制。采用改良Okabe法即外科手术胃黏膜 局部注射乙酸法诱导大鼠胃溃疡模型。大鼠分成10组,即假手术组,模型组,奥美拉唑组,三九胃泰组,茅苍术生品和麸炒品低、中、高剂量组,灌胃给药,每日 2次,连续给药10 d,腹主动脉采血,分离血清,分取胃组织溃疡面。采用酶联免疫吸附(ELISA)法检测血清及胃组织中炎症因子白细胞介素6(IL-6)、白细胞介素 8(IL-8)、肿瘤坏死因子α(TNF-α)和前列腺素E2(PGE2)的含量。实时荧光定量聚合酶链式反应(RT-PCR)法检测胃组织中IL-8和TNF-α mRNA的表达。免疫组织化学法检测胃组织中TNF-α和IL-8的蛋白表达。与假手术组比较,模型组大鼠血清及胃组织中IL-6,IL-8,TNF-α和PGE2的含量明显升高,胃组织中IL-8和TNF-α mRNA的表达和二者的蛋白表达量显著增加,各治疗组均出现不同程度的降低。与茅苍术生品比较,相同剂量的茅苍术麸炒品具有更好的降低血清及胃组织中IL-6,IL-8,TNF-α和PGE2的含量,下调胃组织中IL-8和TNF-α mRNA表达的作用,其中高剂量组及中剂量组均有显著性差异。茅苍术对乙酸致胃溃疡大鼠具有明显的抗炎作用,麸炒后该作用增强;茅苍术抗胃溃疡的作用部分是由于下调IL-6,IL-8,TNF-α和PGE2的含量。 【论文关键词】茅苍术;胃溃疡;炮制;ELISA;RT-PCR;免疫组织化学 [Abstract]To compare the anti-inflammatory activity of the crude Atractylodes lancea (AL) and AL processed products by stir-baking with bran in rat models of gastric ulcer, and preliminarily explore the anti-ulcer mechanisms of AL, the model of gastric ulcer was imitated by local acetic acid injection into gastric mucosa in rats by surgery according to the modified Okabe method. All rats were randomly divided into the following 10 groups: sham-operation group, model group, omeprazole group, Sanjiu Weitai granule group, crude AL low dose group, crude AL middle dose group, crude AL high dose group, processed AL low dose group, processed AL middle dose group, and processed AL high dose group. Rats were administered via intragastric (ig) two times each day, for 10 consecutive days. Blood was collected from the abdominal aorta, serum was separated, and the ulcer tissues were taken. The levels of inflammatory factors interleukin 6, 8 (IL-6, 8), tumor necrosis factor-α (TNF-α), and prostaglandin E2(PGE2) in serum and gastric tissues were determined by enzyme-linked immunosorbent assay (ELISA), and the mRNA expressions of TNF-α and IL-8 in gastric tissues were detected by quantitative real-time reverse transcription polymerase chain reaction (RT-PCR). The protein expressions of TNF-α and IL-8 in gastric tissues were detected by immunohistochemistry. Compared with sham-operation group, the levels of TNF-α, IL-8, IL-6, PGE2 as well as the mRNA expressions and protein expressions of TNF-α, IL-8 in gastric tissues were significantly higher in model group. The above levels were reduced in different degrees in all treatment groups. Compared with the crude AL, same dose of processed AL was more effective in decreasing the levels of TNF-α, IL-8, IL-6, PGE2 in serum and gastric tissues and down-regulating the mRNA expressions of TNF-α and IL-8 in gastric tissues, with significant difference in middle dose groups and high dose groups. The results showed that AL had potent anti-inflammatory effects in rat models of gastric ulcer induced by acetic acid, and the processed AL had more obvious effect. The anti-ulcer action of AL could be attributed partly to down-regulating the levels of TNF-α, IL-8, IL-6 and PGE2. [Key words]Atractylodes lancea (AL); gastric ulcer; processing; ELISA; RT-PCR;immunohistochemistry 茅苍术为菊科植物茅苍术Atractylodes lancea Thunb. DC.的干燥根茎,始载于《神农本草经》[1],具有燥湿健脾、祛风散寒、明目之功效[2]。现代药理研究表明其具有抑菌、抗炎、抗病毒、抗溃疡等多种生物活性[3-6]。茅苍术的炮制方法从古至今有很多种,但大部分炮制方法现代已不再延用,目前最为常用的炮制方法为麸炒法。胃溃疡属于中医“脾虚”、“胃虚”、“脾胃虚寒”、“胃脘痛”等范畴[7-8]。现代医学认为溃疡发生是黏膜侵袭因素和防御因素失衡的结果。胃黏膜攻击因子如炎症因子等是引起溃疡、加重溃疡、延迟溃疡愈合的重要因素[9]。本实验以乙酸诱导大鼠胃溃疡模型,采用ELISA,RT-PCR及免疫组织化学法检测血清及胃组织中重要的炎症因子白细胞介素6(IL-6)、白细胞介素8(IL-8)、肿瘤坏死因子α(TNF-α)和前列腺素E2(PGE2),考察茅苍术对胃溃疡大鼠的抗炎作用,比较生品和麸炒品抗炎作用的差异。 1 材料 INFINITE M200型多功能酶标仪(奥地利 TECAN);Stratgene M3000 型荧光定量PCR 仪(德国Agilent公司);DU640型核酸蛋白分析仪(美国Beckman公司);MR1822型低温高速离心机(法国Jouan公司);BS- 51型奥林巴斯显微镜,JD801形态学图像分析系统(日本Olympus公司)。 |