Effects of different therapeutic methods and typical recipes of Chinese medicine on activation of c-Jun N-terminal Kinase in Kupffer cells of rats with fatty liver disease

<正>Objective:To observe the effects of different therapeutic methods and the recipes of Chinese medicine(CM) on the activation of c-Jun N-terminal kinase(JNK) in Kupffer cells of rats with fatty liver disease and to explore the mechanisms of these therapeutic methods.Methods:By using a random number table,98 rats were randomly divided into 7 groups:control group,model group,and 5 treatment groups,including soothing Liver(Gan) recipe group,invigorating Spleen(Pi) recipe group,dispelling dampness recipe group,promoting blood recipe group,and complex recipe group.Rats in the control group were fed with normal food and distilled water by gastric perfusion,while rats in the model group were fed with high-fat food and distilled spirits by gastric perfusion.Rats in the 5 treatment groups were fed with high-fat food and corresponding recipes by gastric perfusion.Twelve weeks later,all rats were sacrificed and liver tissues were stained for pathohistological observation.Kupffer cells were isolated from livers of rats to evaluate JNK and phospho-JNK expressions by Western blotting.Results:The grade of hepatic steatosis was higher in the model group than the control group(P0.05).Compared with the model group,the grade of fatty degeneration in soothing Liver recipe group and invigorating Spleen recipe group were significantly ameliorated(P0.05).Expressions of JNK and phospho-JNK in Kupffer cells were significantly higher in the model group than those in the control group(P0.05,P0.01).Compared with the model group,expressions of JNK in all treatment groups decreased,especially in invigorating Spleen recipe group and promoting blood recipe group(P0.05).Compared with the model group,expressions of phospho-JNK in all treatment groups declined significantly(P0.01),especially in soothing Live recipe group and invigorating Spleen recipe group. Conclusions:The high expressions of JNK and phospho-JNK in Kupffer cells might play an important role in the pathogenesis of fatty liver disease in rats.The recipes of CM,especially invigorating Spleen recipe and soothing Liver recipe,might protect liver against injury by reducing the total JNK protein content and inhibiting the activation of JNK protein in Kupffer cells of fatty liver model rats,which showed beneficial effects on fatty liver disease.     

Effect of Coiquhoumia Root on the Expression of Transforming Growth Factor-β in Mesangiai Proliferation Giomerulonephritis Model

Summary： To study the efficacy and the mechanism of Colquhoumia root （ Tripterygium hypoglaucure （Le,vL） Hutch） in the treatment of mesangial proliferation glomerulonephritis （MsPGN）, SD rats were injected with anti-thymoeyte serum （ATS） to make MsPGN model （anti-Thyl model）. The rats were then divided into 3 groups： normal control group, anti-Thyl model group and treatment group. Histopathologieal （HE, PAS）, immunohistoehemieal, RT-PCR technique and computer imaging analysis system were used to evaluate mesangial matrix production, the expression of TGF-β protein and mRNA in the tissues of kidney. Our result showed that proteinuria and the ratio of extraeellular matrix/glomerular capillaries area （ECM/CA） were increased significantly in model group. The expression of both TGF-β protein and mRNA in glomeruli was much higher in model group than in control group （P〈0.01）. After the treatment with Colquhoumia root, proteinuria, ECM/CA and the expression of both TGF-β1 protein and mRNA in glomeruli were significantly decreased in treatment group as compared with those in model group. It is concluded that Colquhoumia root is effective in reducing proteinuria and mesangial matrix proliferation in MsPGN and it may achieve these effects by inhibiting the expressions of TGF-β1 protein and mRNA of mesangial cells.     

Role of β2-adrenoceptor-β-arrestin2-nuclear factor-κB signal transduction pathway and intervention effects of oxymatrine in ulcerative colitis

Objective:To investigate the β2-adrenoceptor(β2AR)-β-arrestin2-nuclear factor-κB(NF-κB) signal transduction pathway and the intervention effects of oxymatrine in a rat model of ulcerative colitis.Methods: Forty SD rats were randomly divided into four groups,which included the normal control group,the model group, the mesalazine group and the oxymatrine treatment group,with 10 rats per group.Experimental colitis induced with trinitrobenzene sulfonic acid(TNBS) was established in each group except the normal control group.The rats in the oxymatrine treatment group were treated with intramuscular injection of oxymatrine 63 mg/(kg·d) for 15 days and the rats in the mesalazine group were treated with mesalazine solution 0.5 g/(kg·d) by gastric lavage for 15 days. The rats in the normal control group and model group were treated with 3 mL water by gastric lavage for 15 days. Diarrhea and bloody stool were carefully observed.Histological changes in colonic tissue were examined on day 7 in 2 rats per group that were randomly selected.The expression of β2AR,β-arrestin2 and NF-κB p65 in colon tissue and spleen lymphocytes were detected with immunohistochemistry and Western immunoblotting techniques on day 16 after fasting for 24 h.Six rats died of lavage with 2 each in the normal control,the model group and the mesalazine group;and were not included in the analysis.Results:The rats in the model group suffered from looser stool and bloody purulent stool after modeling.But in the oxymatrine and mesalazine groups,looser stool and bloody purulent stool reduced after treatment.And the colonic wall in the model group was thickened and the colon length shortened.The colon mucosa was congested in multiple areas with edema,erosion,superficial or linear ulcer and scar formation,while the intestinal mucosa injury reduced in the mesalazine and oxymatrine groups(P<0.01).In colonic mucosa and in spleen lymphocytes,compared with the normal control group,the expression of NF-κBp65 were significantly increased(P<0.01) in the model group while the expressions ofβ2AR andβ-arrestin2 were significantly decreased(P<0.01).Compared with the model group,the expression of NF-κBp65 was significantly decreased in the mesalazine group(P<0.01) and oxymatrine treatment group(P<0.01) while the expressions of β2AR and β-arrestin2 were significantly increased(P<0.01).There were no statistically significant differences in the expression of β2AR,β-arrestin2 and NF-κBp65 between the mesalazine group and oxymatrine group(P>0.05).Conclusions:The β2AR-β-arrestin2-NF-κB signal transduction pathway participated in the pathologic course of ulcerative colitis.Oxymatrine attenuated ulcerative colitis through regulating the β2AR-β-arrestin2-NF-κB signal transduction pathway.     

Protective effect of sulodexide on podocyte injury in adriamycin nephropathy rats

This study examined the effect of sulodexide on podocyte injury in rats with adriamycin nephropathy （AN）. A total of 36 healthy male SD rats were randomly assigned to three groups： control group, AN group and sulodexide treatment group. Rat models of AN were established by a single tail intravenous injection of adriamycin （6.5 mg/kg） in both AN group and sulodexide treatment group. Sulodexide （10 mg/kg） was administered the rats in the treatment group once daily by garage from the first day of model establishment until the 14th day or the 28th day. Samples of 24-h urine and renal cortex tissues were harvested at day 14, 28 after the model establishment. Excretion of 24-h urinary protein was measured by Coomassie brilliant blue method. The pathological changes in renal tissues were observed by light microscopy and electron microscopy respectively. Heparanase mRNA was detected by RT-PCR. Expressions of desmin, CD2AP and heparanase were determined by immunohistological staining. The results showed that the expressions of heparanase mRNA and protein were increased in the glomeruli of AN rats at day 14 and 28 after the model establishment, which was accompanied by the increased expression of desmin and CD2AP. The mRNA and protein expression of heparanase was decreased in the sulodexide-treated rats as compared with AN rats at day 14 and 28. And, the protein expression of desmin and CD2AP was reduced as with heparanase in the sulodexide-treated rats. Proteinuria and podocyte foot process effacement were alleviated in the AN rats after sulodexide treatment. There was a positive correlation between the expression of heparanase and the expression of desmin and CD2AP （as well as 24-h urinary protein excretion）. It was concluded that increased heparanase is involved in podocyte injury. Sulodexide can maintain and restore podocyte morphology by inhibiting the expression of heparanase in AN.     

Effect of Antisense FosB and CREB on the Expression of Prodynorphin Gene in Rats with Levodopa-induced Dyskinesias

The effects of antisense FosB and CREB intra-striatum injection on the expression of prodynorphin (PDyn) gene in striatal neurons of Levodopa-induced dyskinesias (LID) rats with Parkinson disease (PD) were explored. PD model in rats was established by 6-OHDA microinjection stereotaxically. The rats were treated with chronic intermittent Levodopa celiac injection for 28 days to get the LED rats. Antisense FosB and cAMP response element-binding protein (CREB) were injected into striatum of all rats respectively. In situ hybridization was used to measure the changes in the expression of PDyn mRNA in striatum and behavior changes were observed. The results showed after administration of antisense FosB, abnormal involuntary movement (AIM) was decreased and the expression of PDyn mRNA in striatum was increased in LID rats as compared with sense FosB group (P<0.01, respectively). As compared with the control group, the expression of PDyn mRNA in striatum was decreased by antisense CREB-treated LID group (P<0.01) and compared with sense CREB treated LID group, antisense CREB-treated LID group showed no changes in AIM scores and the expressions of PDyn mRNA (both P>0.05). In conclusion, FosB protein, which replaced the CREG, could regulate the expression of PDyn mRNA and play critical role in the pathogenesis of LID.     

Effect of expression of TGF-beta and TNF-alpha with Qidan granule treatment in rats by bleomycin-induced pulmonary fibrosis

Objective: To evaluate the therapeutic effects and mechanisms of Qidan granule in blemycinA5-induced pulmonary interstitial fibrosis (PIF)in rats. Methods: PIF models were established by blemycinA5-induced in rats. They were treated by Qidan granule and Hydrocortisone respectively. The pathological changes and collagen protein disposition were observed, and the expression of TGF-β, TNF-α proteins were measured by immunohistochemical technique . Results: The pulmonary alveolitis and fibrosis were alleviated remarkably in Qidan granule group compared with those in the model control group and hydrocortisone group (P <0. 01). The expression of TGF-β and TNF-α protein were higher in Qidan granule group than those in normal group , and were significantly less than those in the model control group and in hydrocortisone group (P < 0. 01). Conclusion: Qidan granule would ameliorate the pulmonary alveolitis and fibrosis. TGF-β and TNF-α might play an important role in the development of alveolitis and fibro     

Inhibition of Proprotein Convertase Subtilisin/Kexin Type 9: A Novel Mechanism of Berberine and 8-hydroxy Dihydroberberine against Hyperlipidemia

Objective:To investigate the effect and molecular mechanisms of different doses of 8-hydroxy dihydroberberine(Hdber) for the treatment of hyperlipidemia in rats.Methods:A rat model of hyperlipidemia was established by feeding rats a high-fat diet for 4 weeks in 70 rats of 80 animals,and 10 rats were randomly selected as control group.The hyperlipidemic rats were then randomly divided into the following groups:a model group(MOD);a berberine group[BBR,156 mg/(kg·day)];Hdber groups,which were treated with different doses of Hdber[78,39 and 19.5 mg/(kg·day)];and a simvastatin group[SIM,4 mg/(kg·day)].The corresponding therapy was administered to the rats of each treatment via gastric tubes.Normal animals were used as a control group.The blood levels of various lipids,including total cholesterol,triglycerides,high-density lipoprotein cholesterol,low-density lipoprotein cholesterol,free fatty acid(FFA),apolipoprotein AⅠ(Apo-A Ⅰ) and apolipoprotein B(Apo-B) were examined.The protein expressions of low-density lipoprotein receptor(LDL-R),sterol regulatory element-binding protein 2(SREBP-2),3-hydroxy-3-methylglutaryl coenzyme A reductase(HMGCR) and proprotein convertase subtilisin/kexin type 9(PCSK-9) in liver tissues were determined by Western blot analysis.Results:Compared with the control group of rats,the model group demonstrated a deteriorated blood lipid profile and exhibited increased expression levels of PCSK-9protein in their liver tissues(P0.01).In addition,the high-fat diet decreased the expression levels of LDL-R,SREBP-2and HMGCR proteins in murine liver tissues.However,the addition of berberine or Hdber reversed the blood lipid profile changes(P0.05 or P0.01),decreased the expression levels of PCSK-9 proteins(P0.01),and increased the expression levels of LDL-R proteins in the hyperlipidemic rats(P0.01).These compounds did not significantly influence the expression levels of SREBP-2 and HMGCR proteins in the hyperlipidemic rats.Conclusions:Hdber is effective in the treatment of hyperlipidemia in rats.The therapeutic mechanisms of Hdber may be associated with increasing the expression of LDL-R protein and decreasing the expression of PCSK-9 protein in liver tissues.     

Effects of angiotensin-converting enzyme inhibitors and angiotensin II type 1 receptor blockers on lymphangiogenesis of gastric cancer in a nude mouse model

Background Angiotensin-converting enzyme inhibitors （ACEI） and angiotensin II type 1 receptor blockers （ARB） can inhibit tumor growth by inhibition of angiogenesis. This study was designed to study the anticancer effects of ACEI and ARB on tumor growth and lymphangiogenesis in an implanted gastric cancer mouse model. Methods A model of gastric cancer was established by subcutaneously inoculating human gastric cancer cell line SGC-7901 into 60 nude mice. One week later, all mice were randomly divided into 5 groups. A control group received physiologic saline once daily for 21 days. Mice in the 4 treatment groups received one of the following agents by gavage once daily for 21 days： perindopril, 2 mg/kg; captopril, 5 mg/kg; Iosartan, 50 mg/kg; or valsartan, 40 mg/kg. Twenty-one days after treatment, all the mice were sacrificed and the tumors were removed. Tumor sections were processed, and immunohistochemical methods were used to observe the expressions of vascular endothelial growth factor C （VEGF-C）, matrix metalloproteinase 7 （MMP-7）, and lymphatic microvessel density （LMVD）.
Results Tumor volume was significantly inhibited in all ACEI and ARB groups, compared with the control group （all P 〈0,01）. LMVD in the ACEI and ARB groups was also significantly lower than that of the control group （all P 〈0.01）. In the ACEI groups, the expressions of VEGF-C and MMP-7 were both significantly decreased, compared with the control group （all P 〈0.05）. In the ARB groups, expression of VEGF-C was significantly decreased compared with the control group （all P 〈0.05）. However, no significant difference was found in the expression of MMP-7 between ARB groups and the control group.
Conclusion In a mouse model, ACEI and ARB might inhibit gastric cancer tumor growth by suppressing lymphangiogenesis.     

Expression of cyclooxygenase-2 and its pathogenic effects in nonalcoholic fatty liver disease

Objective:To investigate the expression of cyclooxygenase-2 and its pathological effect in the experimental nonalcoholic fatty liver of rats,and to explore its possible mechanism.Methods:The rat NAFLD model was established by giving a fat-enriched diet.The blood samples were obtained form abdominal aorta and the levels of serum ALT,AST and IL-1,changes in the hepatic tissue 6-k-PGF1α TXB2 were measured.The expression level of COX-2 in rats livers were assayed by immunohistochemistry,RT-PCR and Western-blot.Results:Light microscope analysis revealed that hepatocytes were injured in the model group and slightly in the treatment group.The levels of serum TXB2 and IL-1 in the fatty liver rats were increased.Compared with the model group,the IL-1 and TXB2 increased significantly(P < 0.05),on the contrary,compared with the normal group,the hepatic tissue 6-Keto-prostagland decreased significantly in the model group(P < 0.05),the treatment group also increased but P > 0.05.There was no positive expression of COX-2 in hepatic tissue of normal rats.In the model group,there was positive expression of COX-2 antigen and the number of COX positive cells progressively increased at 4,8,12 wks.The intensity of expression of COX-2 had significantly increased(P < 0.05)and the intensity of COX-2 expression in the treated group decreased remarkably compared with the model group(P < 0.05).The expression of COX-2 mRNA and the level of COX-2 protein were significantly stronger in the liver of model rats compared with normal rats,and significantly weaker in treated rats,than in 8W and 12W model rats(P < 0.05).Conclusion:The increase of COX-2 expression in NAFLD is closely associated with the severity of liver inflammation and damage.COX-2 may play an important role in the progression of rat NAFLD,and the expression of COX-2 mRNA is downregulated by cyclooxygenase-2 inhibitor,which can depress the oxidative stress and control inflammatory response efficiently.     

Effect of Jinguo Weikang Capsule （金果胃康胶囊） on Proto-oncogene Expression of Gastric Mucosa in Rats with Gastric Precancerous Lesions

Objective： To study the effect of Jinguo Weikang Capsule （金果暖康胶囊, JWC） on the gene expression of H-ras, epidermal growth factor receptor （EGFR）, P53 and C-myc of the gastric mucosa in rats with gastric precancerous lesions, and to investigate the action mechanism of JWC on gastric precancerous lesions. Methods： A rat model with paratypical proliferation of the gastric epithelium mucosa was established by using ^60Co irradiation. Rats were divided into the normal group, model group, high-, medium-, low-dose JWC treatment groups, and the vitacoenzyme control group, and were treated for 30 days. The expression of H-ras, EGFR, P53 and C-myc genes of the gastric mucosa was detected by using immunohistochemical methods. Results： The expression and over-expression rates of H-ras, EGFR, P53 and C-myc gene in the high- and medium-dose JWC treatment groups were significantly lower （P〈0.05） as compared with those of the model group. Conclusion： JWC can inhibit the expression of the H-ras, EGFR, P53 and C-myc genes expression of the gastric mucosa in rats, which may be one of mechanisms involved in suppressing or reversing gastric carcinogenesis.     

Gastric cancer induced by N-methyl-N′-nitro-N-nitrosoguanidine in rat with ulcers and expressions of ras and c-erbB2 genes

Objective: To observe the series of pathological changes during the development of gastric adenocarcinoma in ulcerative rats induced by N-methyl-N′-nitro-N-nitrosoguanidine (MNNG), and the expression profile of related oncogenic protein.Methods: MNNG was administered in rats with ulcers due to acetic acid treatment to induce gastric cancer, and the protein expressions of ras and c-erbB2 genes in the ulcer were examined immunohistochemically along with pathological examination.Results: The incidence of gastric adenocarcinoma in the model group reaches 40% (6/15), while none of the rats developed cancer in the control group with ulcers.Positive expressions of the proteins of p21ras and c-erbB2 were observed in the tissues undergoing canceration in the 6 rats of model group, but were not observed in the 5 control rats; p53 protein expression, however, failed to be detected in both groups.Conclusion: A new animal model of gastric cancer has been established in rats with gastric ulcer after MNNG treatment, which may facilitate the pharmacological research of gastric cancer.     

大鼠实验性胃溃疡自愈过程中HDC和H+,K+-ATP酶的表达

目的探讨胃黏膜内组氨酸脱羧酶（histidine decarboxylase,HDC）和H^＋,K^＋-ATP酶的表达与大鼠实验性胃溃疡自愈过程的关系。方法制备大鼠乙酸性胃体溃疡模型,采用逆转录聚合酶链反应和Western blot技术,观察溃疡自愈过程中大鼠胃黏膜内HDC和H^＋,K^＋-ATP酶mRNA及蛋白表达的动态变化。结果制模术后1d大鼠胃体出现明显溃疡,3d溃疡最为明显,12d溃疡基本愈合。HDC和H^＋,K^＋-ATP酶mRNA表达在制模术后1d即开始降低,术后9d恢复正常。HDC和H^＋,K^＋-ATP酶蛋白表达在制模术后也出现降低,术后6d达到最低,术后12d基本恢复正常。结论在胃溃疡自愈过程中,胃黏膜内HDC和H^＋,K^＋-ATP酶mRNA和蛋白表达下调,其作用是抑制胃酸分泌以促进溃疡愈合。     

大鼠乙酸性胃溃疡自愈过程中HDC和H+、K+-ATP酶的表达

目的探讨胃黏膜内组氨酸脱羧酶(HDC)和H ,K -ATP酶的表达与大鼠乙酸性胃溃疡自愈过程的关系。方法制备大鼠乙酸性胃体溃疡模型,采用逆转录聚合酶链反应和免疫组化法,观察溃疡自愈过程中大鼠胃黏膜内HDC和H ,K -ATP酶mRNA及蛋白表达的动态变化。结果制模术后1d大鼠胃体出现明显溃疡,3d溃疡最为明显,12d溃疡基本愈合。胃黏膜内HDC和H ,K -ATP酶mRNA表达在制模术后1d即开始降低,术后9d恢复正常。胃黏膜内HDC和H ,K -ATP酶阳性细胞率及胞质平均灰度值在制模术后也出现降低,术后6d达到最低,术后12d基本恢复正常。结论在胃溃疡自愈过程中,胃黏膜内HDC和H ,K -ATP酶表达下调,其作用是抑制胃酸分泌以促进溃疡愈合。     

选择性COX-2抑制剂对实验性大鼠胃溃疡愈合及胃酸分泌的影响

目的 明确选择性环氧合酶-2(COX-2)抑制剂对实验性大鼠胃溃疡愈合的影响,并从胃酸分泌的角度探讨其延缓胃溃疡愈合的机制.方法 以乙酸性大鼠胃溃疡模型为基础,观察选择性COX-2抑制剂塞来昔布对胃溃疡愈合的影响及其对胃液总酸度、H ,K -ATP酶mRNA和蛋白表达及壁细胞形态的影响.结果 制模术后第9日,生理盐水组和塞来昔布组的溃疡面积(mm2)分别为11.9±3.1和19.7±3.8(P＜0.01);制模术后第6日和第9日,塞来昔布组胃液总酸度和H ,K -ATP酶mRNA和蛋白表达水平均显著高于生理盐水组,而两组壁细胞的分泌小管和微绒毛数量则均无明显差异.结论 选择性COX-2抑制剂能显著延缓实验性大鼠胃溃疡的愈合过程,其延缓胃溃疡愈合的机制之一可能是通过刺激壁细胞胃酸分泌,加强了对溃疡底部新生肉芽组织的消化作用.     

Induction of intestinal metaplasia in stomach of dogs and expression of tumor -related proteins in animal gastric mucosa lesions

Ｉｔｉｓｖｅｒｙｉｍｐｏｒｔａｎｔｔｏｓｔｕｄｙｔｈｅｐｒｅｃａｎｃｅｒｏｕｓｌｅｓｉｏｎｏｆｇａｓｔｒｉｃｍｕｃｏｓａｆｏｒｅａｒｌｙｄｉａｇｎｏｓｉｓａｎｄｔｒｅａｔｍｅｎｔｏｆｇａｓｔｒｉｃｃａｎｃｅｒ(ＧＣ)ＷｅｌｌｄｉｆｆｅｒｅｎｔｉａｔｅｄｏｒｉｎｔｅｓｔｉｎａｌｔｙｐｅＧＣｈａｓｂｅｅｎｓｕｐｐｏｓｅｄｔｏｄｅｖｅｌｏｐｆｒｏｍｇａｓｔｒｉｃｍｕｃｏｓａｖｉａｉｎｔｅｓｔｉｎａｌｍｅｔａｐｌａｓｉａ(ＩＭ)Ａｓｔｏｓｙｓｔｅｍａｔｉｃａｌｌｙｏｂｓｅｒｖｉｎｇｔｈｅｄｅｖｅｌｏｐｍｅｎ…     

解毒化浊和胃方阻断大鼠CAG癌前病变的分子生物学机制

目的探讨解毒化浊和胃方阻断大鼠慢性萎缩性胃炎(CAG)癌前病变(PLGC)发展的分子生物学机制。方法将60只大鼠分为空白对照组15只,模型对照组15只,中药组15只,西药组15只,除空白对照组外,各组以甲基亚硝基胍造模,模型对照组给予双蒸水灌胃,中药组给予解毒化浊和胃方灌胃,西药组给予叶酸灌胃。采用免疫组化及原位分子杂交标记的方法测EGFR蛋白翻译和mRNA转录水平以及病变黏膜组织中增殖细胞核抗原(PCNA)、H-ras癌基因蛋白表达情况。结果模型对照组眦组织EGFR蛋白翻译和mRNA转录均有表达.表达随病变的进展而递增;中药组EGFR蛋白及mR- NA的表达下调,PCNA指数、H-ras癌基因蛋白阳性指数明显低于模型对照组(P<0.05)。结论解毒化浊和胃方对大鼠PLGC细胞的增殖有良好的阻断作用,该作用可能与下调PLGC组织EGFR蛋白及mRNA的表达有关。     

氯吡格雷对乙酸诱导大鼠胃溃疡愈合的影响及机制

 目的 明确氯吡格雷对实验性大鼠胃溃疡愈合的影响,并从微血管形成的角度探讨其延缓胃溃疡愈合的机制。方法 以乙酸性大鼠胃溃疡模型为基础,将22只大鼠分为模型组(n=6)、氯吡格雷组(n=8)和生理盐水组(n=8),观察氯吡格雷对胃溃疡愈合的影响,及对溃疡底部微血管密度(microvessel density,MVD)、胃黏膜内皮抑素(endostatin,ES)及血管内皮生长因子A165(vascular endothelial growth factor A165,VEGF A165)表达的影响。结果 制模术后第10天,氯吡格雷组和生理盐水组溃疡面积分别为(11±3.07) mm2、(7±1.85) mm2,差异有统计学意义(P=0.023 0)。氯吡格雷组溃疡底部MVD显著低于生理盐水组 (P=0.011 4)。氯吡格雷组胃黏膜VEGF A165含量显著低于生理盐水组(P<0.01),ES含量显著高于生理盐水组(P<0.01)。溃疡底部MVD与胃黏膜VEGF A165含量正相关(r=0.688 8、P=0.003 2),与胃黏膜ES含量负相关(r=-0.767 1、P=0.000 5)。结论 氯吡格雷可显著延缓乙酸性大鼠胃溃疡愈合,推测可能是通过调节胃黏膜VEGF A165及ES的表达以抑制溃疡底部的微血管形成,从而使损伤黏膜修复受阻。     

P53、P2lras蛋白和P—糖蛋白在胃癌中过表达的意义

目的研究胃癌组织p53、p21ras蛋白和P-耐药糖蛋白(P-gp)在胃癌中的表达及临床意义.方法采用免疫组化SABC法检测7例正常胃粘膜、12例慢性萎缩性胃炎、8例粘膜慢性胃炎伴肠型不典型增生和93例胃腺癌组织中p53、p21ras蛋白和P-gp的表达.结果p53、p21ras蛋白和P-gp在正常胃粘膜组、癌前病变组和胃腺癌组中的阳性率分别为0,14.3%,0;20.0%,25.0%,5.0%;55.9%,51.6%,44.1%.p53蛋白、P-gp表达均与淋巴结转移有关(P＜0.05);p21ras蛋白表达与肿瘤的浸润程度有关(P＜0.05);P-gP表达与p53和p21ras表达有显著的协同性(P＜0.05).结论p53和p21ras蛋白常并存于胃癌组织中.p53突变蛋白和P-gp过表达在胃癌淋巴结转移中起重要作用,因此早期进行p53蛋白和P-gp检测有重要的临床意义.     

阿司匹林促进胃酸分泌的途径与溃疡复发

目的：探讨阿司匹林促进胃酸分泌的途径及溃疡复发的机制。方法：用乙酸复制大鼠胃溃疡模型,待第25天溃疡完全愈合后,用阿司匹林诱导已愈合的溃疡复发。在模型复制后的第55天,用免疫组化方法观测了环加氧酶-1、环加氧酶-2和胃泌素（Gas）在胃黏膜中的表达,用酶联免疫吸附法测定了胃黏膜中的前列腺素E2的含量,还测定了胃液的pH、再生黏膜厚度、扩张腺体数。结果：环加氧酶-1积分光密度在模型对照组、盐水对照组和阿司匹林组中没有差异,而阿司匹林组环加氧酶-2与Gas的积分光密度高于模型对照组和盐水对照组（P〈0.01）;阿司匹林组再生黏膜扩张腺体数高于模型对照组和盐水对照组（P〈0.01）,而再生黏膜厚度、前列腺素E2含量、pH值都低于模型对照组和盐水对照组（P〈0.01）。结论：阿司匹林可能通过抑制环加氧酶的活性导致前列腺素E2生成减少,进而促进G细胞Gas的表达,引起壁细胞分泌胃酸增多,导致愈合质量下降,使溃疡复发。     

三叶因子1表达与胃粘膜损伤及胃癌的关系

目的测定三叶因子1在正常及病理条件下胃粘膜中的表达情况，探讨TFF1在胃粘膜损伤修复及胃癌抑制中的作用及意义。方法应用免疫组化方法测定正常及不同病理条件下胃粘膜中TFF1的表达情况，通过图像分析软件分析其阳性信号平均光密度值了解其表达情况。结果胃炎、胃溃疡及十二指肠球部溃疡患者TFF1表达明显高于正常胃粘膜：多发／复合性溃疡患者TFF1表达高于单发的消化性溃疡患者；胃溃疡患者与十二指肠球部溃疡患者、胃炎患者与单一消化性溃疡患并表达相比均无统计学差异；胃腺癌患者癌旁组织表达明显高于正常胃粘膜，而腺癌组织的表达强度则与癌组织的分化程度呈正比、分化程度愈低，表达愈弱，低分化腺癌无阳性表达，中、高分化腺癌表达略低于正常粘膜、但二者对比无统计学差异；食管鳞痛及癌旁组织均无阳性表达；各组男女对比均无统计学差异。结论TFF1在胃炎及消化性溃疡中表达升高，且在多发／复合性溃疡中的表达较单发溃疡表达升高，即粘膜损伤越严重其表达越强，提示其在胃粘膜保护及促进上皮重建机制中具有一定的作用。TFF1在癌旁组织中表达增强提示其可能与肿瘤抑制及分化机制有关，而在癌组织中表达减弱，且分化程度越低表达越弱可能与癌组织腺体及细胞破坏、TFF1的分泌减少有关。