糖皮质激素对急性胰腺炎大鼠胰腺细胞凋亡的影响及其意义

目的探讨糖皮质激素对急性胰腺炎(AP)大鼠胰腺细胞凋亡的影响及其意义.方法将SD大鼠54只随机分为3组:正常对照组,胰腺炎组和激素治疗组,每组18只.经十二指肠行胆胰管逆行加压注射4%的牛磺胆酸钠,诱导大鼠AP模型,于术后3 h、6 h和12 h采取断颈方法分批处死动物,应用末端脱氧核苷酸转换酶(TdT)介导的原位末端标记(TUNEL)法检测胰腺组织细胞凋亡变化,观察各组大鼠胰腺组织病理改变.结果(1)AP大鼠的胰腺凋亡细胞增多,与对照组比较均有显著差异(P＜0.01),注射激素后,胰腺凋亡细胞减少,6 h、12 h的凋亡指数均显著低于对应时相的AP组(P＜0.05);(2)激素治疗后,AP大鼠胰腺炎症细胞、坏死细胞明显减少,病变减轻,6 h、12 h病理评分均显著低于AP组(P＜0.05).结论糖皮质激素具有抑制胰腺细胞凋亡的作用,保护腺泡细胞、阻止细胞死亡可能是糖皮质激素减轻AP病变严重程度的一个重要因素.     

新癀片对急性胰腺炎大鼠胰腺细胞凋亡的影响

目的 观察新癀片对急性胰腺炎(AP)大鼠胰腺细胞凋亡和胰腺组织Bcl-2、c-Myc蛋白表达的影响,并探讨其作用机制.方法 90只Wistar大鼠按完全随机法分为对照组、AP组和新癀片治疗组.采用胆胰管逆行注射5%牛黄胆酸钠1 ml/kg体重方法制备AP模型.治疗组于制模后30 min按480 mg/kg体重的剂量予新癀片水溶液灌胃.术后6、12、24 h分批处死大鼠,检测血淀粉酶活性,观察胰腺病理变化,TUNEL法检测胰腺细胞凋亡,Western blotting法检测胰腺组织Bcl-2、c-Myc蛋白表达.结果 对照组12 h点的血淀粉酶活性、胰腺病理评分、凋亡指数、胰腺组织Bcl-2和c-Myc蛋白表达量分别为(1927±186)U/L、0、0.59±0.12、0.406±0.112、0.185±0.046;AP组分别为(5611±473)U/L、2.65±0.56、3.80±0.91、0.282±0.082、0.339±0.076;治疗组分别为(4572±400)U/L、2.40±0.75、7.15±0.86、0.220±0.068、0.302±0.090.AP组和治疗组的淀粉酶活性、胰腺病理评分、凋亡指数、c-Myc蛋白表达量均显著高于对照组(P值均＜0.05),而Bcl-2蛋白表达量显著低于对照组(P＜0.05).与AP组比较,治疗组的淀粉酶活性、胰腺病理评分、胰腺组织Bcl-2蛋白表达量均显著降低(P值均＜0.05),凋亡指数显著增高(P＜0.05),c-Myc蛋白表达量无显著变化.结论 新癀片可通过下调Bcl-2蛋白表达、诱导AP早期胰腺细胞凋亡,从而减轻胰腺炎症反应.     

高甘油三酯血症对大鼠急性胰腺炎模型中胰腺导管上皮细胞间紧密连接的影响研究

目的研究高甘油三酯血症(hypertriglyceridemia,HTG)对大鼠急性胰腺炎(acute pancreatitis,AP)模型胰腺组织细胞间紧密连接(tight junctions,TJs)的影响。方法48只4周龄雄性SD大鼠随机分成普通饲养组(24只)和高脂饲养组(24只),4周后普通饲养组随机分为C组和AP组,高脂饲养组随机分为HTG组和高甘油三酯血症急性胰腺炎(HTGP)组。AP组和HTGP组经腹腔注射雨蛙肽建立AP模型,C组和HTG组经腹腔注射同等剂量的生理盐水,分别于造模24 h、48 h处置大鼠,采用HE染色法观察胰腺病理改变,免疫组织化学法检测胰腺组织中TJs蛋白脂解刺激脂蛋白受体(LSR)、Tricellulin蛋白(TRIC)、ZO-1、occludin、claudin-7定位及表达,透射电镜观察胰腺导管上皮细胞间TJs变化情况。结果高脂饲养组的大鼠血清甘油三酯(triglyceride,TG)较普通饲养组明显升高(P<0.05);HTG组胰腺组织病理评分高于C组(P<0.05),相同时点HTGP组胰腺组织病理评分高于AP组,但差异无统计学意义(P>0.05);HTG组LSR、TRIC表达显著低于C组(P<0.05),AP组和HTGP组的24 h时点LSR、TRIC、occludin、claudin-7表达均低于相应对照组(P<0.05),HTGP组24 h时点LSR和TRIC的表达显著低于AP组的对应时点(P<0.05);透射电镜观察AP组和HTGP组的24 h时点,发现主胰管上皮细胞TJs较C组和HTG组减少、细胞间隙增宽,且HTGP组比AP组的细胞间隙增宽更明显。结论TJs蛋白LSR、TRIC、ZO-1、occludin、claudin-7在HTG及HTGP大鼠胰腺组织中表达较非高脂模型下降,其中以三细胞间紧密连接(tricellular tight junctions,tTJs)蛋白LSR及TRIC下降明显,提示HTG可能减弱胰腺组织的tTJs,进而加重胰腺组织损伤。     

抗氧化剂对急性坏死性胰腺炎大鼠一氧化氮、丙二醛的影响

目的　探讨抗氧化剂N_乙酰半胱氨酸 (NAC)对急性坏死性胰腺炎 (ANP)大鼠胰腺组织一氧化氮 (NO)及丙二醛(MDA)的影响。方法　雄性SD大鼠 114只 ,随机分成正常对照组 (C组 ,n =3 0 )、急性胰腺炎组 (A组 ,n =42 )和NAC干预组 (N组 ,n= 42 )。A组分 2次腹腔内注射 8%L_精氨酸 (L_Arg) 1 2mg/g诱导ANP ;C组同法腹腔内注射等量生理盐水 ;N组先提前 1小时 (h)腹腔内注射 0 5mol/L的NAC 0 0 5mg/g ,然后同A组方法诱导ANP。在首次注射L_Arg后于 6h、12h、2 4h、3 6h、48h、72h分批处死大鼠 ,观察大鼠胰腺组织NO和MDA水平及胰腺病理变化。结果　N组各时点NO和MDA水平均较A组明显降低 (均P <0 0 1或P<0 0 5) ,N组 12h、2 4h、3 6h、48h、72h的胰腺病理改变较A组的明显减轻 (均P <0 0 1或P <0 0 5)。结论　NAC可降低胰腺组织NO、MAD水平 ,减轻了实验性ANP大鼠的胰腺损害 ,对胰腺组织有保护作用     

急性胰腺炎大鼠胰腺组织中Smac/DIABLO、XIAP mRNA的表达及其意义

目的 检测急性胰腺炎(AP)大鼠胰腺组织中促凋亡基因Smac/DIABLO和凋亡抑制基因XIAP的mRNA表达,分析其与疾病严重程度的关系.方法 54只SD大鼠按数字表法随机分成假手术组、急性水肿性胰腺炎(AEP)组、急性坏死性胰腺炎(ANP)组.通过胰胆管逆行注射1%、3.5%脱氧胆酸钠方法分别制备AEP、ANP模型.收集制模后3、6、12 h胰腺标本,常规病理检查;TUNEL法检测细胞凋亡;实时定量PCR法检测Smac/DIABLO、XIAP mRNA的表达.结果 胰腺病理改变表示模型制备成功.术后6 h假手术组、AEP组、ANP组胰腺腺泡细胞凋亡指数分别为0.67±0.82、6.62±0.78和4.70±0.82,各组间相差显著(P＜0.05).AEP组Smac/DIABLO mRNA的表达随时间延长而逐渐增加,ANP组则随时间延长而逐渐下降,以假手术组为参考,6 h时AEP组和ANP组的表达量分别为2.41±0.92和1.47±0.53,相差显著(P＜0.05).相反,AEP组XIAP mRNA的表达随时间延长逐渐下降,而ANP组表达逐渐增加,6 h时表达量分别为5.51±1.07和6.99±1.00,相差显著(P＜0.05).结论 AP时胰腺组织Smac/DIABLO mRNA的表达与细胞凋亡指数一致,与病情严重程度相反,而XIAP mRNA的表达与病情严重程度一致.XIAP、Smac/DIABLO基因参与细胞凋亡的调节.     

PEP-1-SOD1对SAP大鼠细胞凋亡的影响

背景:重度急性胰腺炎(SAP)以胰腺弥漫性出血和组织坏死为特征,具有很高的死亡率。PEP-1-SOD1是一种利用基因工程技术合成的融合蛋白,稳定性较高,具有一定的抗炎作用。目的:探讨PEP-1-SOD1对SAP大鼠细胞凋亡的影响。方法:将24只雄性Wistar大鼠分为对照组、SAP组和实验组。以5%牛磺胆酸钠制备SAP大鼠模型,实验组在造模前30 min腹部皮下注射8. 0 mg/kg PEP-1-SOD1,SAP组注射同剂量0. 9%NaC l溶液。行组织病理学评分,以TUNEL法检测胰腺腺泡细胞凋亡情况,分别以荧光定量PCR和蛋白质印迹法检测caspase-3 mRNA和蛋白表达。结果:造模后24 h,SAP组和实验组大鼠血清脂肪酶、淀粉酶水平、caspase-3 mRNA和蛋白表达均显著高于对照组(P 0. 05),而实验组血清脂肪酶、淀粉酶显著低于SAP组(P 0. 05),caspase-3 mRNA和蛋白表达显著升高(P 0. 05)。造模后6 h、24 h,SAP组和实验组胰腺组织病理学评分、凋亡指数显著高于对照组(P 0. 05),而实验组组织病理学评分显著低于SAP组(P 0. 05),凋亡指数显著升高(P 0. 05)。结论:PEP-1-SOD1可通过调控凋亡相关基因caspase-3的表达,减轻SAP大鼠胰腺组织病理损害,增加胰腺腺泡细胞凋亡,促进胰腺功能恢复正常。     

吡格列酮对急性坏死性胰腺炎大鼠胰腺细胞凋亡的作用

目的 探讨吡格列酮在重症急性胰腺炎发病机制中与凋亡激活的关系.方法 将80只SD大鼠按随机表法分为急性坏死性胰腺炎组（ANP组）、假手术组、二甲基亚砜溶剂对照组（DMSO组）、吡格列酮干预组（吡格列酮组）,每组20只.采用胰胆管逆行注射5％牛磺胆酸钠1 ml/kg体质量的方法制作ANP模型,吡格列酮组在造模前30 min腹腔注射吡格列酮40 mg/kg体质量.术后1、3、6、12 h分批处死大鼠,收集胰腺组织.采用常规HE染色进行胰腺组织病理评分,采用TUNEL染色方法检测大鼠胰腺细胞凋亡,免疫组化法和蛋白质印迹法检测胰腺组织PPARγ的表达变化,同时检测胰腺组织caspase3的表达变化.结果 吡格列酮干预后大鼠胰腺组织病理损伤较ANP组大鼠有所减轻,差异有统计学意义（P＜0.05）.吡格列酮组胰腺组织PPARγ表达水平为2.69 ±0.46,显著高于ANP组的0.75 ±0.05,差异有统计学意义（P＜0.05）.吡格列酮3h组大鼠胰腺细胞凋亡指数为8.35 ±0.95,显著高于同时点ANP组的4.37±1.22;caspase 3的活性为9.24±1.78,显著高于ANP组的5.04±0.86,差异均有统计学意义（P值均＜0.05）.结论 吡格列酮干预后大鼠胰腺炎症减轻,PPARγ和caspase 3表达升高,胰腺细胞凋亡率升高.     

重症急性胰腺炎NF-κB活化及维生素C干预治疗的实验研究

目的观察重症急性胰腺炎胰腺组织中NF-kB活化情况及VitC干预治疗对NF-kB活性的影响。方法54只雌性大鼠随机分为假手术组、重症急性胰腺炎组(SAP)、VitC预处理组(VitC SAP)。SAP模型经胆胰管内加压注射3.5%牛黄胆酸钠0.1ml／100g。VitC预处理组在建立模型前1h按VitC注射液1g／kg肌注给药。分别于建模后3h、6h、12h将大鼠分批处死,检测血淀粉酶,免疫组化法检测各组胰腺组织NF-kB的表达。常规病理并按Jan'S标准进行评分。结果VitC预处理组血清淀粉酶水平较SAP组在各个时间点均明显下降(3h,P<0.01,6h、12h,P<0.05)。VitC预处理组胰腺炎症范围、腺泡坏死程度及血管变化均较SAP组明显减轻,胰腺组织病理评分在各时间点明显低于SAP组(P<0.01或P<0.05)。假手术组可见胰腺组织NF-kB少量表达,VitC预处理组胰腺细胞NF-kB阳性率在各时间点均较SAP组明显减少(P<0.01或P<0.05)。结论抗氧化剂VitC能抑制胰腺细胞NF-kB活化,减轻SAP胰腺组织损害和降低血清淀粉酶水平,对SAP具有一定治疗作用。     

加贝酯预防急性胰腺炎的作用机制研究

目的 通过观察加贝酯对胰腺细胞凋亡及Bax、Bcl-2蛋白表达的影响,探讨加贝酯预防大鼠胰管注射法诱导的急性胰腺炎(AP)的相关机制.方法 16只SD大鼠随机分为假手术组(4只)、AP组和加贝酯治疗组(各6只).以50 mmHg(1 mmHg = 0.133 kPa)的恒压向胰胆管内注入30%泛影葡胺诱导SD大鼠AP模型,制模前15 ～ 20 min加贝酯(4 mg·h-1·kg-1体重)静脉持续滴注60 min进行预防.组织病理检查观察胰腺炎症程度,应用TUNEL染色、免疫组化检测胰腺细胞凋亡和Bcl-2、Bax蛋白表达.结果 加贝酯治疗组的胰腺组织病理改变较AP组减轻(P ＜ 0.05).治疗组凋亡指数(AI)、Bax和Bcl-2表达值分别为8.00 ± 1.80,10.12 ± 1.52和1.83 ± 0.39,前两者较AP组显著增高,而Bcl-2蛋白无显著差别.治疗组AI、Bax表达与胰腺的炎症程度呈负相关.结论 加贝酯静脉滴注对大鼠胰管注射法诱导的AP有一定的预防作用.其机制可能与促进细胞凋亡和Bax蛋白表达上调有关.     

IL-1和IL-6与急性胰腺炎相关性的实验研究

目的探讨血清IL-1和IL-6含量与急性胰腺炎病变程度的相关性。方法Wistar大鼠120只随机分为3组,每组40只,正常对照组腹腔注射生理盐水,急性胰腺炎组腹腔注射L-arginine500mg/100g,每小时1次,共3次,IL-10干预组在诱导胰腺炎模型后的2、5、8h腹腔注射IL-10各10000u。各组于造模后的4、12、24、36h分批处死大鼠,进行组织病理评分、全自化生化分析仪检测CRP、ELISA法检测IL-1和IL-6浓度。结果急性胰腺炎组病理评分、CRP、IL-1及IL-6含量均显著高于正常对照组,IL-10干预组各项指标均较急性胰腺炎组显著下降,急性胰腺炎组中IL-1、IL-6与病理评分及CRP存在正相关。结论大剂量腹腔L-arginine诱导的重症急性胰腺炎大鼠中,血清IL-1、IL-6及CRP显著升高,应用IL-10可显著减轻胰腺病变程度,IL-1、IL-6浓度与胰腺病变正相关。     

Expression and significance of ICAM-1 and its counter receptors LFA-1 and Mac-1 in experimental acute pancreatitis of rats

AIM: To investigate the role of intercellular adhesion molecule-1 (ICAM-1) and its counter receptors LFA-1 and Mac-1 in acute pancreatitis (AP). METHODS: SD rats were allocated to AP group and control group randomly (25 rats each). AP was induced by infusion of 5% chenodeoxycholic acid into the pancreatic duct, followed by ligation of pancreatic duct. The rats were sacrificed at 1, 3, 6, 12 and 24 h after induction of pancreatitis. Five rats were sacrificed at one time point in the two groups before the blood and specimens from pancreas and lung were obtained. Serum amylase and ascitic fluid were measured at each time point. Expression of ICAM-1 at different time points was assessed by immunohistochemistry in pancreas and lung, and the expression of LAF-1 and Mac-1 on neutrophils at different time points was detected by flow cytometer. RESULTS: Induction of AP was confirmed by the serum levels of amylase and histological studies. The expression of ICAM-1 in pancreas increased significantly than that in the control group at all time points (P < 0.05 or P < 0.01), as well as the expression in lung except at 1 h. The expression of LFA-1 and Mac-1 on neutrophil in blood increased significantly in AP group than that in control group at several time points (P < 0.05 ox P < 0.01). The amount of ascitic fluid and serum amylase level of AP group increased significantly than that of control group at all time points (P < 0.05 or P < 0.01). Parallel to these results, a significant neutrophil infiltration was found in pancreas and lung tissues of AP group rats. CONCLUSION: Our findings suggest the important role for ICAM-1, LFA-1 and Mac-1 in mediating the development of AP from a local disease to a systemic illness. Upregulation of ICAM-1, LFA-1, Mac-1 and subsequent leukocyte infiltration appear to be significant events of pancreatic and pulmonary injuries in AP.     

Hyperlipidemia intensifies cerulein-induced acute pancreatitis associated with activation of protein kinase C in rats

AIM: To investigate the effects of hyperlipidemia on acute pancreatitis (AP) and the possible mechanisms. METHODS: Rat models of hyperlipidemia and AP were established by Triton WR1339 and cerulein respectively. Human albumin was used to treat AP complicated by hyperlipidemia. In each group, we compared the histological score, volume of ascites, ratio of pancreatic wet/dry weight, serum amylase (AMY) and pancreatic acinar cell apoptosis. The level of protein kinase C (PKC) membrane translocation in pancreatic tissue was detected by Western blot. RESULTS: In the hyperlipidemia model established by Triton WR1339, triglyceride (TG) increased remarkably and reached its peak 6 h after injection, and most rats developed mild acute pancreatitis. Histological score, volume of ascites, ratio of wet/dry weight and serum AMY in AP animals with hyperlipidemia were obviously higher than those in AP animals (P < 0.05) and decreased after albumin therapy but not significantly (P > 0.05). Apoptotic cells detected by terminal deoxynucleotidyl transferase-mediated dUTPbiotin nick end labeling (TUNEL) increased in AP animals with hyperlipidemia and did not change distinctly after albumin therapy. PKC membrane translocation level increased in AP animals with hyperlipidemia and decreased remarkably after albumin therapy (P < 0.05). CONCLUSION: Hyperlipidemia may induce AP or intensify pancreatic injury. Albumin therapy can not alleviate pancreatic lesion effectively. PKC activation may be one mechanism by which AP is intensified by hyperlipidemia.     

Effect of Chaiqinchengqi decoction on sarco/endoplasmic reticulum Ca~（2＋）-ATPase mRNA expression of pancreatic tissues in acute pancreatitis rats

AIM： To investigate the effect of Chaiqinchengqi decoction （CQCQD） on sarco/endoplasmic reticulum Ca2＋-ATPase （SERCA） mRNA expression of pancreatic tissues in acute pancreatitis （AP） rats. METHODS： Thirty Sprague-Dawley （SD） rats were randomized into control group, AP group and CQCQD group （n = 3 × 10）. The rats in the CQCQD group were intragastrically administered with CQCQD （10 mL/kg every 2 h） after induction of AP by intraperitoneal injection of caerulein （50 μg/kg.h × 5） within 4 h. At 6 h after the induction of AP model, pancreatic tissues were collected for the pathological observation, mRNA extraction for determination of SERCA1 and SERCA2 mRNA expression or pancreatic acinar cell isolation for measurement of fluorescence intensity （FI） of intracellular calcium ion concentration [Ca2＋ i. RESULTS： There was no expression of pancreatic SERCA1 mRNA in the control group and the AP group. The expression of pancreatic SERCA2 mRNA in the AP group was down-regulated （expression ratio = 0.536; P = 0.001） compared with the control group, while that in the CQCQD group was up-regulated （expression ratio= 2.00; P = 0.012） compared with AP group. The FI of intracellular [Ca2＋ of pancreatic acinar cells in the AP group （138.2 ± 23.1） was higher than the C group （111.0 ± 18.4） and the CQCQD group （118.7 ± 15.2 ） （P 〈 0.05） and the pancreatic pathological score in the CQCQD group was lower than that in the AP group （5.7 ± 1.9 vs 9.2 ± 2.7, P 〈 0.05）.CONCLUSION： CQCQD can up-regulate the expression of SERCA2 mRNA of pancreatic tissues, reduce intracellular calcium overload and relieve pancreatic tissue lesions.     

Induction of apoptosis by artemisinin relieving the severity of inflammation in caerulein-induced acute pancreatitis

AIM： To observe the apoptosis and oncosis of pancreatic acinar cells and secondary inflammatory reaction in pancreatic tissue from rats with acute pancreatitis （AP）, and the influences of artemisinin on them.METHODS： AP was induced by 4 intraperitoneal iojections of caerulein at 1 h intervals. To induce apoptosis, solution of artemisinin （50 mg/kg） was given intraperitoneally 1, 12, 24 and 36 h after the last caerulein injection. Histological examination of impairment of pancreatic tissue and detection of serum amylase were performed to evaluate the severity of acute pancreatitis. Apoptosis and oncosis were detected with acridine orange （AO） and ethylene dibromide （EB） staining. Caspase-3 and myeloperoxidase （MPO） activity were measured by colorimetric assay. Nuclear factor-kappa B （NF-KB） activation was detected by flow cytometry. Macrophage inflammatory protein-lα（MIP-1α） protein was measured by Western blot. Interleukin- 1β（IL-1β） mRNA was detected by RT-PCR.RESULTS： Addition of artemisinin increased the number of apoptotic cells （11.7%±1.4% vs 6.3%± 0.7%, P 〈 0.05）, while reduced the number of oncotic cells （13.0% ±2.4% vs 17.5%±2.2%, P 〈 0.05）. The activity of caspase-3 speeded up （1.52±0.21 vs 1.03±0.08, P 〈 0.05）, the pancreas pathological impairment was relieved （3.0±0.5 vs 4.0± 0.5, P 〈 0.05） and the level of serum amylase decreased （5642±721 U/dL vs 7821±653 U/dL, P 〈 0.05）. The activation of NF-1α （29%±4.1% vs 42%±5.8%）, MIP-1α protein （3.7±0.5 vs 5.8±0.7）,MPO （0.52±0.06 U/g vs 0.68±0.09 U/g）, IL-1β mRNA （1.7 ±0.3 vs 2.4 ±0.4） in the apoptosis inducing group was obviously decreased （P 〈 0.05）.CONCLUSION： Inducing apoptosis can relieve pathological impairment and inflammatory reaction in AP rats.     

急性胰腺炎胰腺腺泡细胞不同死亡方式与细胞内酶释放的关系

目的 观察轻重程度不同的体外急性胰腺炎(AP)胰腺腺泡细胞发生凋亡、胀亡的状况及细胞内酶的释放情况,探讨两者的关系。方法 以两步酶消化法分离胰腺腺泡细胞,分为4组。AP组加入雨蛙素0.1μg/ml,细菌脂多糖(LPS)组加入雨蛙素及LPS( 10 mg/L),奥曲肽(OCT)组加入雨蛙素及OCT(100ng/ml),对照组加培养液。应用丫碇橙(AO)和溴乙锭(EB)双染色法检测腺泡细胞的凋亡及胀亡,采用比色法检测培养上清中淀粉酶及乳酸脱氢酶( LDH)含量。结果 对照组、AP组、LPS组、OCT组的细胞凋亡指数分别为2.2±0.4、6.4±0.6、4.6±0.4、11.2±1.2;胀亡指数分别为3.0±0.4、17.2±1.6、23.0±2.2、12.8±1.4;LDH的分泌量分别为(2180 ±240)、(8060±930)、(9460±920)、(6860±740) U/dl;淀粉酶的分泌量分别为(1750±190)、(3820±460)、(4420±480)、(2260±260) U/L。AP组、LPS组、OCT组的上述4项指标均显著高于对照组(P值均＜0.05);LPS组的胀亡指数及LDH和淀粉酶分泌量均较AP组显著增加(P值均＜0.05),而凋亡指数则较AP组显著减少(P＜0.05);OCT组的凋亡指数较AP组显著增多(P＜0.05),而胀亡指数及LDH、淀粉酶分泌均较AP组显著减少(P值均＜0.05)。结论 诱导AP胰腺腺泡细胞凋亡,并减少细胞胀亡的发生,可减少腺泡细胞内酶的释放。     

大鼠急性胰腺炎肺损伤中巨噬细胞炎症蛋白-2的改变

目的：研究大鼠急性胰腺炎(AP)肺损伤与巨噬细胞炎症蛋白-2(MIP-2)的关系.方法：成年♂SD大鼠随机分为AP3h组、AP 6h组,每组6只；对照3h组、对照6h组,每组3只.胰胆管逆行注射50g/L脱氧胆酸钠(DCA)诱导大鼠AP模型.肺组织镜下病理评分及髓过氧化物酶(MPO)活性评估肺损伤.ELISA法检测血清、胰腺及肺组织MIP-2含量.结果：肺镜下病理评分在AP3h组明显高于对照3h组(t=2.14,P=0.035),AP6h组进一步升高,与对照6h组比较差异具有非常显著性的意义(t=3.12,P=0.009).肺组织MPO活性升高,与对照6h组相比差异具有显著性的意义(t=2.72,P=0.015).血清MIP-2在对照3h组中不能检出,在对照6h组含量很低；在AP3h组明显升高,与对照3h组相比差异具有非常显著性的意义(t=3.76,P=0.007)；在AP6h组进一步升高,与对照6h组及AP3h组比较差异具有显著性的意义(t=2.42,P=0.023；t=3.17,P=0.024).血清MIP-2浓度与胰腺镜下病理评分和肺镜下病理评分呈正相关(r=0.42,P= 0.014；r=0.35,P=0.036)；肺组织MIP-2含量与胰腺镜下病理评分和血清淀粉酶(AMY)呈正相关(r=0.38,P=0.023；r=0.42,P=0.016).结论：大鼠MIP-2与DCA诱导的大鼠AP肺损伤关系密切,在大鼠AP肺损伤的病理过程中可能发挥了重要作用.     

趋化因子CCL20及其受体CCR6在急性坏死性胰腺炎中的表达及意义

目的 探讨CC趋化因子配体20(CCL20)和CC趋化因子受体6(CCR6)在实验性急性坏死性胰腺炎(ANP)发病机制中的作用.方法 48只SD大鼠按完全随机法分为ANP组和对照组.采用胆胰管逆行注射4%牛磺胆酸钠建立大鼠ANP模型,以注射等容积生理盐水作为对照组.术后1、3、6、12 h分批处死大鼠,取血检测血清淀粉酶,胰腺组织常规病理检查并评分,免疫组化和RT-PCR检测胰腺组织中CCL20、CCR6 mRNA及蛋白表达.结果 ANP大鼠血清淀粉酶和胰腺组织病理评分明显高于对照组.ANP组术后胰腺组织CCL20 mRNA及蛋白表达呈时间依赖性增强(P＜0.05);术后6 h胰腺组织中CCR6 mRNA明显高于对照组(0.88±0.05对0.23±0.09,P＜0.01),术后12 h CCR6mRNA表达较6 h时降低,但仍高于对照组(0.37±0.10对0.15±0.07,P＜0.05),CCR6蛋白变化与其mRNA变化一致.结论CCL20和CCR6参与ANP的发生和发展.