α-生育酚对慢性胰腺炎大鼠胰腺纤维化的影响

目的 观察抗氧化剂α-生育酚对慢性胰腺炎(CP)大鼠胰腺纤维化的作用,探讨其机制.方法 雄性Wistar大鼠按完全随机法分为对照组、ANP组、α-生育酚组.采用尾静脉单次注射8 mg/kg体重二丁基二氯化锡( dibutyltindich loride,DBTC)造模.造模24h后,α-生育酚组大鼠给予800 mg/kg体重的α-生育酚灌胃,每日1次,持续4周.ANP组和对照组给予0.6 ml色拉油灌胃.4周后处死大鼠,取胰腺组织行病理评分及胶原染色,检测胰腺组织丙二醛( MDA)和羟脯氨酸水平,实时定量PCR法检测胰腺组织TGF-β1 mRNA表达.结果 灌胃4周后,α-生育酚组大鼠胰腺组织炎症、纤维沉积、异常结构等损伤均较ANP组明显减轻;胰腺组织MDA和羟脯氨酸水平较ANP组显著降低[(0.40±0.20)nmol/100mg蛋白比(1.07±0.41) nmol/100mg蛋白;(402.49±27.62) μg/g蛋白比(664.92±29.04) μg/g蛋白,P值均＜0.05];胰腺TGF-β1 mRNA表达较ANP组显著降低(2.24±0.89比3.35±0.66,P＜0.05).结论α-生育酚通过降低CP大鼠的体内氧化应激水平,降低TGF-β1 mRNA表达,从而减轻胰腺组织的炎症反应和纤维化程度.     

脂质过氧化在胰腺纤维化形成中的作用

目的 研究脂质过氧化对胰腺星状细胞(pancreatic stellate cells, PSC)活化的影响及其在胰腺纤维化形成中的作用.方法 实验大鼠每周2次腹腔内注射二乙基二硫代氨基甲酸盐(diethyldithiocarbamate, DDC),共10周建立胰腺纤维化模型.分别于注射后第2,4,6,8,10周处死大鼠,检测胰腺组织中丙二醛(MDA)含量,各时间点胰腺组织α-平滑肌肌动蛋白(α-SMA)、转化生长因子-β1(TGF-β1)的表达,逆转录聚合酶链反应(RT-PCR)检测α1-Ⅰ型胶原(ColⅠα1)、TGF-β1 mRNA水平.结果 注射DDC后,胰腺组织内MDA含量逐步升高,8周时高达(6.21 ± 0.70)nmol/mg prot(P ＜ 0.01).4周时可见明显的细胞外基质沉积和纤维化形成,8周时小叶及小叶内广泛纤维化,大量腺体萎缩,形成瘢疤组织.α-SMA、TGF-β1的阳性表达在2周时已出现,4周时明显增加,且阳性细胞多位于胰腺小叶间及腺泡旁纤维化区域.胰腺组织ColⅠα1 mRNA在造模2周时少量表达,4周表达增加,8周后维持在较高水平;对照组TGF-β1 mRNA表达水平较低,TGF-β1 mRNA在造模4周时表达明显增强,与对照组相比有显著性差异(P ＜ 0.05),6周后表达增加不明显.结论 随着造模时间的延长,胰腺组织MDA含量的增加与胶原纤维形成、TGF-β1表达及活化PSC的增加相一致,提示脂质过氧化产物通过激活PSC及刺激TGF-β1的分泌,增加胰腺组织中胶原的沉积,促进胰腺纤维化的形成.     

前列腺素E1对人脐静脉内皮细胞单核细胞趋化蛋白-1表达的影响

目的 探讨前列腺素E1(PGE1)对人脐静脉内皮细胞单核细胞趋化蛋白-1(monocyte chemoattactant protein-1,MCP-1)表达的影响及可能机制.方法 用培养的人脐静脉内皮细胞观察氧化低密度脂蛋白(ox-LDL)对MCP-1、核因子(NF)-κB表达的影响及PGE1的干预作用.采用ELISA检测上清液MCP-1浓度,原位杂交检测MCP-1 mRNA的表达,免疫印迹检测NF-κB蛋白表达.结果 (1)PGE1(0.001、0.010、0.100 mol/L)组与ox-LDL(100 μg/ml)组比较,MCP-1蛋白表达为(0.327±0.051)、(0.214±0.213)、(0.247±0.228)pg/ml对(0.655±0.013)pg/ml,MCP-1mRNA表达为(0.061±0.008)、(0.033±0.006)、(0.026±0.004)吸光度(A)/μm2对(0.220±0.032)A/μm2,PGE1显著抑制了ox-LDL所诱导的MCP-1改变.(2)Western blot结果显示,PGE1呈浓度依赖性抑制ox-LDL所诱导的NF-κB P65蛋白表达.结论 PGE1可抑制ox-LDL诱导的内皮细胞MCP-1及NF-κB表达上调,这可能与PGE1介导的血管内皮保护作用有关.     

早期阻断MCP-1对实验性急性坏死性胰腺炎的作用

目的 探讨趋化因子MCP-1对实验性急性坏死性胰腺炎(ANP)及其并发症的影响.方法 60只SD大鼠按数字表法分为假手术组、ANP组和MCP-1多抗干预组(干预组),各20只.采用3.5%牛黄胆酸钠制备ANP模型,干预组于制模后0、6 h皮下注射抗MCP-1多抗.观察血清淀粉酶、MCP-1、D-乳酸含量变化;观察胰腺、肺、小肠组织病理改变及MCP-1 mRNA的表达;检测胰腺MCP-1蛋白表达;检测肺、小肠髓过氧化酶(MPO)含量.结果 干预组12 h的血淀粉酶、MCP-1、D-乳酸含量分别为(4666±412)U/L、(39.53±8.25)pg/ml和(6.3±2.2)mg/L,均显著低于ANP组的(9611±363)U/L、(63.42±9.32)pg/ml和(9.3±2.1)mg/L(P值均<0.05);胰腺、肺、小肠组织MCP-1 mRNA表达量分别为0.431±0.009、0.211±0.018和0.442±0.017,均显著低于ANP组的0.624±0.010、0.523±0.019和0.569±0.024(P值均<0.05);胰腺MCP-1蛋白表达评分为2.0±0.1,显著低于ANP组的4.0±0.2(P<0.05);肺、小肠组织MPO含量分别为(11.1±3.0)U/g组织和(19.2±2.0)U/g组织,均与ANP组的(39.2±3.1)U/g组织和(13.1±2.1)U/g组织有显著差异(P值均<0.05).结论 早期阻断MCP-1不但可以减轻急性胰腺炎病理损伤,而且能减轻急性肺损伤和肠屏障的损伤程度.     

脂质过氧化在胰腺纤维化形成中的作用

目的研究脂质过氧化对胰腺星状细胞(pancreatic stellate cells,PSC)活化的影响及其在胰腺纤维化形成中的作用。方法实验大鼠每周2次腹腔内注射二乙基二硫代氨基甲酸盐(diethyldithiocarbamate,DDC),共10周建立胰腺纤维化模型。分别于注射后第2,4,6,8,10周处死大鼠,检测胰腺组织中丙二醛(MDA)含量,各时间点胰腺组织α-平滑肌肌动蛋白(α-SMA)、转化生长因子-β1(TGF-β1)的表达,逆转录聚合酶链反应(RT-PCR)检测α1-型胶原(Colα1)、TGF-β1 mRNA水平。结果注射DDC后,胰腺组织内MDA含量逐步升高,8周时高达(6.21±0.70)nmol/mg prot(P<0.01)。4周时可见明显的细胞外基质沉积和纤维化形成,8周时小叶及小叶内广泛纤维化,大量腺体萎缩,形成瘢疤组织。α-SMA、TGF-β1的阳性表达在2周时已出现,4周时明显增加,且阳性细胞多位于胰腺小叶间及腺泡旁纤维化区域。胰腺组织Colα1 mRNA在造模2周时少量表达,4周表达增加,8周后维持在较高水平;对照组TGF-β1mRNA表达水平较低,TGF-β1 mRNA在造模4周时表达明显增强,与对照组相比有显著性差异(P<0.05),6周后表达增加不明显。结论随着造模时间的延长,胰腺组织MDA含量的增加与胶原纤维形成、TGF-β1表达及活化PSC的增加相一致,提示脂质过氧化产物通过激活PSC及刺激TGF-β1的分泌,增加胰腺组织中胶原的沉积,促进胰腺纤维化的形成。     

过氧化物酶体增殖物激活受体-γ在大鼠慢性胰腺炎进程中的表达及意义

目的 探讨过氧化物酶体增殖物激活受体-γ(peroxisome proliferator-activated receptor-γ,PPAR-γ)在大鼠慢性胰腺炎(CP)进程中的表达及其意义.方法 经大鼠尾静脉一次性注射二丁基二氯基锡方法制备CP模型.按体重随机分为对照组及造模后1、3、5、7、14、42 d组.行胰腺常规病理检查,Sirius Red染色观察胶原含量,测定胰腺组织髓过氧化物酶(MPO)活性,免疫组化法测定α-SMA、PPAR-γ蛋白的表达.结果 造模7d内胰腺呈急性炎症改变,42 d时出现不同程度的腺泡坏死、萎缩,淋巴细胞、单核细胞浸润,小叶内或小叶周围纤维化形成,伴胰管改变,符合从急性胰腺炎(AP)向CP的进展过程.造模后1d,胰腺组织MPO活性、α-SMA蛋白表达即显著增加[(0.78±0.71) U/g比(0.15±0.05)U/g,6.67 ±3.14比0,P值均＜0.05],之后随造模时间延长未继续增加.造模后7d,胶原含量达峰值,为(45.42±15.99)％,较对照组的( 10.87±2.28)％显著增加(P＜0.05),胶原沉积从仅在血管壁进展到沉积在导管周围至小叶内和(或)小叶周围.对照组PPAR-γ仅在血管壁呈阳性表达,表达量为0.17±0.41,随造模时间延长表达渐增强,42d达峰值,为4.83±2.71.结论 在CP造模过程中PPAR-γ蛋白表达逐渐增强,并发挥有限的抗炎症和抗纤维化作用.     

肠内免疫微生态营养对急性坏死性胰腺炎全身炎症反应影响的研究

目的 探讨肠内免疫微生态营养对ANP猪全身炎症反应的影响.方法 胰管注射5%牛磺胆酸钠1ml/kg体重制备猪ANP模型.造模后24 h,18头猪按随机分组法分为胃肠外营养组(PN)、肠内要素营养组(EN)和肠内免疫微生态营养组(EIN),分别进行相应的营养支持8 d.造模前、造模后24 h、营养支持1 d、2 d、4 d、8 d分别检测外周血内毒素、TNF-α、IL-1β、IL-6、IL-10及单核细胞NF-κB活性.8 d时取胰腺行病理学检查.结果 胰腺病理改变符合ANP.造模后24 h,EIN组外周血内毒素、TNF-α、IL-1β、IL-6、IL-10和单核细胞NF-κB水平分别为(1.85±0.18)EU/L、(461.59±128.25)pg/ml、(185.49±58.81)pg/ml、(354.26±34.63)pg/ml、(110.32±25.18)pg/ml、(51.06 ±2.27)%,均较造模前明显增高(P＜0.01),但与其他两组无显著差异;营养支持8 d后,EIN组血浆上述各项分别为(1.48±0.16)EU/L、(30.11±9.12)pg/ml、(20.17±7.04)pg/ml、(36.42±7.24)pg/ml、(89.46±13.54)pg/ml、(9.06±0.17)%,均较EN组、PN组明显下降(P＜0.05),且IL-10/IL-6比值为2.51±0.42,与制模前的2.28±0.19接近.结论 早期肠内免疫微生态营养能有效减轻内毒素血症,降低NF-κB活性及细胞因子浓度,维持促抗炎反应平衡.     

氧自由基对转化生长因子-β1表达的影响及其在胰腺纤维化中的作用

目的研究氧自由基在慢性胰腺炎发病过程中对转化生长因子-β1(TGF-β1)表达的影响及其促胰腺纤维化作用.方法每周2次在大鼠腹腔内注射不同剂量二乙基二硫代氨基甲酸盐(DETC),分别于注射后1.5 h,24 h,48 h,72 h,2周,3周,4周,6周将大鼠处死,检测胰腺中超氧歧化酶(SOD),谷胱甘肽过氧化物酶(GSH-PX)活性和丙二醛(MDA)含量以及α-平滑肌肌动蛋白(α-SMA),结蛋白(Desmin),胶原Ⅰ,Ⅲ(CoⅠ,Ⅲ),转化生长因子β1(TGF-β1),纤维连接蛋白(FN)的表达. 结果注入DETC后,胰腺组织内SOD、GSH-PX活性下降,MDA含量升高,提示氧自由基增多,3周后出现较明显纤维化,6周达高峰,与对照组有显著差异(P＜ 0.001).2周起胰腺内α-SMA,Desmin,TGF-β1呈阳性表达,提示胰腺星状细胞(PSCs)的激活.CoⅠ,CoⅢ,FN的表达2周时弱,4周时强.RT-PCR半定量测定2周时TGF-β1 mRNA、FN mRNA水平高于对照组(P＜ 0.001),4周和6周时达高峰.结论氧自由基可能通过激活PSCs刺激TGF-β1的分泌,后者促使了胰腺纤维化的形成.     

氧自由基对转化生长因子-β1表达的影响及其在胰腺纤维化中的作用

目的研究氧自由基在慢性胰腺炎发病过程中对转化生长因子-β1(TGF-β1)表达的影响及其促胰腺纤维化作用。方法每周2次在大鼠腹腔内注射不同剂量二乙基二硫代氨基甲酸盐(DETC),分别于注射后1.5h,24h,48h,72h,2周,3周,4周,6周将大鼠处死。检测胰腺中超氧歧化酶(SOD),谷胱甘肽过氧化物酶(GSH-PX)活性和丙二醛(MDA)含量以及α-平滑肌肌动蛋白(α-SMA),结蛋白(Desmin)。胶原Ⅰ,Ⅲ(CoⅠ,Ⅲ).转化生长因子β1(TGF-β1),纤维连接蛋白(FN)的表达。结果注入DETC后,胰腺组织内SOD、GSH-PX活性下降,MDA含量升高,提示氧自由基增多,3周后出现较明显纤维化,6周达高峰,与对照组有显著差异(P<0.001)。2周起胰腺内α-SMA,Desmin,TGF-β1呈阳性表达,提示胰腺星状细胞(PSCs)的激活。CoⅠ,CoⅢ,FN的表达2周时弱,4周时强。RT-PCR半定量测定2周时TGF-β1mRNA、FNmRNA水平高于对照组(P<0.001),4周和6周时达高峰。结论氧自由基可能通过激活PSCs刺激TGF-β1的分泌,后者促使了胰腺纤维化的形成。     

苦参碱抗大鼠胰腺纤维化作用及机制研究

目的 探讨苦参碱对胰腺纤维化的干预作用,为其临床应用提供实验依据.方法 48只雄性Wistar大鼠随机分为正常组、模型组和治疗组,每组16只.以腹腔注射DDC(750 mg/kg体重)每周2次,共6周建立胰腺纤维化动物模型,治疗组于DDC注射后2周起每日腹腔注射苦参碱(100 mg/kg体重),6周后处死动物.采用放射免疫法检测血清透明质酸.胰腺常规病理检查、评分,Masson染色判断胶原纤维量.免疫组化和RT-PCR法检测胰腺组织生长因子β1(TGF-β1)及Smad3、Smad7的蛋白和mRNA表达.结果 治疗组血清透明质酸浓度、病理积分及胶原纤维的表达量分别为(105.85 ± 25.69)ng/ml、3.16 ± 1.15及(19.16 ± 4.27)%,TGF-β1和Smad3蛋白表达分别为(23.16 ± 7.68)%和(18.65 ± 9.82)%,TGF-β1 mRNA和Smad3 mRNA表达分别为0.33 ± 0.10和0.23 ± 0.03,均较模型组明显降低(P ＜ 0.01).而Smad7的表达与模型组无显著差异.结论 大鼠腹腔注射DDC可建立胰腺纤维化动物模型.苦参碱具有显著的抗胰腺纤维化的作用,其机制可能与抑制TGF-β1的产生、抑制TGF-β/Smads信号转导通路活性有关.     

抵抗素在大鼠急性胰腺炎中的表达

目的 检测抵抗素在大鼠急性胰腺炎(AP)中的表达,探讨其与胰腺病理改变的关系.方法 40只SD大鼠按数字表法随机分为正常组、假手术组、急性水肿性胰腺炎(AEP)组和急性坏死性胰腺炎(ANP)组.AEP组腹腔注射雨蛙素,ANP组腹腔注射精氨酸,正常组未做任何处理,假手术组腹腔注射等容量生理盐水.测定大鼠血清淀粉酶、抵抗素、TNF-α、IL-1β、C反应蛋白(CRP)水平,记录胰腺/体重比值,观察胰腺组织病理变化,免疫组化法检测胰腺组织抵抗素蛋白表达,实时定量PCR法检测胰腺组织抵抗素mRNA表达.结果 抵抗素主要定位于胰腺腺泡细胞的胞质内.AEP组血清淀粉酶水平、胰腺/体重(g/kg)比值、胰腺组织病理评分、抵抗素mRNA表达量及血清抵抗素、IL.1β、TNF-α 和CRP水平分别为(4377 ±343)U/L、(8.67 ±1.43)、(5.39 ±0.26)、(2.04 ±0.19)、(10.21 ±1.34)ng/ml、(184.18 ±45.24)pg/ml、(194.24 ±44.81)pg/ml、(3586 ±63)ng/ml;ANP组分别为(6750 ±322)U/L、(9.33 ±1.76)、(7.81 ±0.28)、(3.29 ±0.30)、(15.14 ±0.84)ng/ml、(349.31 ±94.54)pg/ml、(315.59 ±37.04)pg/ml、(4345 ±244)ng/ml.两组均显著高于假手术组的(1442 ±183)U/L、(4.34±0.42)、(1.10 ±0.21)、(0.88 ±0.08)、(5.13 ±0.74)ng/ml、(108.74 ±31.03)pg/ml、(106.44 ±21.31)pg/ml和(2895 ±165)ng/ml(P<0.01),且该两组间差异也有统计学意义(P<0.01或P<0.05).血清抵抗素水平与CRP、TNF-±、IL-1β水平及胰腺组织病理评分均呈正相关,相关系数r分别为0.711、0.871、0.794和0.812(P<0.01).结论 抵抗素与AP的发生、发展有关,其检测结果可能是评估AP严重程度的有价值的指标之一.     

抵抗素在大鼠急性胰腺炎中的表达

目的检测抵抗素在大鼠急性胰腺炎（AP）中的表达,探讨其与胰腺病理改变的关系。方法40只SD大鼠按数字表法随机分为正常组、假手术组、急性水肿性胰腺炎（AEP）组和急性坏死性胰腺炎（ANP）组。AEP组腹腔注射雨蛙素,ANP组腹腔注射精氨酸,正常组未做任何处理,假手术组腹腔注射等容量生理盐水。测定大鼠血清淀粉酶、抵抗素、TNF-α、IL-1β、C反应蛋白（CRP）水平,记录胰腺／体重比值,观察胰腺组织病理变化,免疫组化法检测胰腺组织抵抗素蛋白表达,实时定量PCR法检测胰腺组织抵抗素mRNA表达。结果抵抗素主要定位于胰腺腺泡细胞的胞质内。AEP组血清淀粉酶水平、胰腺／体重（g／kg）比值、胰腺组织病理评分、抵抗素mRNA表达量及血清抵抗素、IL-1β、TNF-α和CRP水平分别为（4377±343）U／L、（8．67±1．43）、（5．39±0．26）、（2．04±0．19）、（10．21±1．34）ng/ml、（184．18±45．24）pg／ml、（194．24±44．81）pg／ml、（3586±63）ng／ml;ANP组分别为（6750±322）U／L、（9．33±1．76）、（7．81±0．28）、（3．29±0．30）、（15．14±0．84）ng／ml、（349．31±94．54）pg／ml、（315．59±37．04）pg／ml、（4345±244）ng／ml。两组均显著高于假手术组的（1442±183）U／L、（4．34±0．42）、（1．10±0．21）、（0．88±O．08）、（5．13±0．74）ng/ml、（108．74±31．03）pg／ml、（106．44±21．31）pg／ml和（2895±165）ng／ml（P〈0．01）,且该两组间差异也有统计学意义（P〈0．01或P〈0．05）。血清抵抗素水平与CRP、TNF-α、IL-1β水平及胰腺组织病理评分均呈正相关,相关系数r分别为0．711、0．871、0．794和0．812（P〈0．01）。结论抵抗素与AP的发生、发展有关,其检测结果可能是评估AP严重程度的有价值的指标之一.     

Anti-monocyte chemoattractant protein 1 gene therapy attenuates experimental chronic pancreatitis induced by dibutyltin dichloride in rats

BACKGROUND: Monocyte chemoattractant protein 1 (MCP-1) is a member of the C-C chemokine family and exerts strong chemoattractant activity in monocytes, macrophages, and lymphocytes. Rat pancreatic fibrosis induced by dibutyltin dichloride (DBTC) is considered to be an appropriate chronic pancreatitis model histologically and enzymatically, as has demonstrated in a previous study. AIM: We examined the effect of human dominant negative inhibitor of MCP-1 (mutant MCP-1) on progression of chronic pancreatitis induced by DBTC in a rat model. METHODS: We used the experimental model of chronic pancreatitis induced by DBTC in rats. Mutant MCP-1 or empty plasmid at a dose of 50 microg/body weight was administrated into rat thigh muscles on days 4, 11, and 18 after administration of DBTC. On days 14 and 28, we evaluated the effect of mutant MCP-1 morphologically and biochemically. RESULTS: The mutant MCP-1 treated group inhibited early pancreatic inflammation and later pancreatic fibrosis histologically, and showed a decrease in serum MCP-1 concentration, intrapancreatic hydroxyproline, alpha-smooth muscle actin, and an increase in intrapancreatic amylase and protein content compared with the empty plasmid treated group. The mutant MCP-1 group also inhibited intrapancreatic mRNA expression of cytokines and chemokines. CONCLUSIONS: : Our findings suggest that monocyte/macrophage recruitment and the systemic MCP-1 signal pathway contribute to progression of chronic pancreatitis, and that blockade of MCP-1 may suppress the development of pancreatic fibrosis.     

The effect of sulindac, a non-steroidal anti-inflammatory drug, attenuates inflammation and fibrosis in a mouse model of chronic pancreatitis

ABSTRACT: BACKGROUND: Chronic pancreatitis is characterized by progressive fibrosis, pain and loss of exocrine and endocrine functions. The long-standing chronic pancreatitis and its associated pancreatic fibrosis are the most common pathogenic events involved in human pancreatic carcinogenesis, but the therapeutic strategies to chronic pancreatitis and the chemoprevention of pancreatic carcinogenesis are very limited. METHODS: We investigated the effect of sulindac, a non-steroidal anti-inflammatory drug (NSAID), on inhibition of chronic pancreatitis in a caerulein induced chronic pancreatitis mouse model. RESULTS: Sulindac significantly reduced the severity of chronic pancreatitis including the extent of acini loss, inflammatory cell infiltration and stromal fibrosis. The protein expression of phosphorylation of MEK/ERK was inhibited in the chronic pancreatic tissues by sulindac treatment as measured by Western blot assay. The levels of inflammatory cytokines including TNF-alpha and MCP-1 were also significantly decreased with sulindac treatment, as well as the expression of TGF-beta, PDGF-beta, SHH and Gli in the chronic pancreatic tissue detected by qPCR assay and confirmed by western blot assay. The activation of pancreatic satellet cells was also inhibited by sulindac as measured by the activity of alpha-smooth muscle actin (alpha-SMA) in the pancreatic tissue of chronic pancreatitis. CONCLUSIONS: Sulindac is a promising reagent for the treatment of chronic pancreatitis via inhibition of inflammatory cell infiltration and stromal fibrosis, the inhibitory effect of sulindac on chronic pancreatitis may through targeting the activation ERK/MAPK signaling pathway.     

沙利度胺对大鼠急性坏死性胰腺炎保护作用的实验研究

目的 探讨沙利度胺对大鼠急性坏死性胰腺炎(ANP)的保护作用及机制.方法 54只SD大鼠按数字表法随机分成ANP组、沙利度胺组和对照组,每组18只.采用5%牛磺胆酸钠胰胆管逆行注射方法建立ANP模型.沙利度胺组于建模后1 h予沙利度胺200 mS/kg体重灌胃.术后3、6、12 h分批处死大鼠,观察腹水量;ELISA法检测血清TNF-α、IL-6、IL-18水平;流式细胞术检测外周血CD4+、CD8+T细胞比例;RT-PCR法检测胰腺组织TNF-α mRNA表达;免疫组化法检测胰腺组织细胞间黏附分子1(ICAM-1)蛋白表达;行胰腺常规病理检查.结果 术后6 h,对照组的腹水量,血清TNF-α、IL-6、IL-18水平和CD4+、CD8+T 细胞比例,胰腺组织TNF-α mRNA及CAM-1蛋白表达,病理评分分别为(1.03±0.31)ml、(57.17±11.29)pg/ml、(24.45 ±4.14)pg/ml、(64.23 ±21.85)pg/ml、(47.58±9.21)%、(40.88±2.96)%、0.07±0.02、0.57±0.30、0.67±0.81;ANP组分别为(3.63±0.38)ml、(107.54±33.05)pg/ml、(47.30±11.40)pg/ml、(367.76±108.43)pg/ml、(54.90±7.15)%、(17.17±3.12)%、0.65±0.26、3.20±0.57、11.50±1.87;沙利度胺组分别为(1.45±0.53)ml、(80.60±20.48)pg/ml、(26.61±10.85)pg/ml、(321.82±85.20)pg/ml、(29.80±2.19)%、(15.52±1.96)%、0.35±0.23、2.37±0.67、8.00±3.03.ANP组除CD8+T细胞比例显著降低外,其余指标均较对照组显著增加(P值均<0.05).沙利度胺组指标均显著低于ANP组(P值均<0.05).结论 沙利度胺能通过抑制TNF-α表达,减少炎症递质的释放,从而减轻ANP大鼠的胰腺病理损害.     

Increased angiogenin expression in obstructive chronic pancreatitis surrounding pancreatic cancer but not in pure chronic pancreatitis

We previously demonstrated the increased expression of angiogenin (ANG) in pancreatic cancer and its relation to cancer aggressiveness; however, the expression patterns and the roles of angiogenin in chronic pancreatitis are still unknown. We investigated the expression of ANG both in the tissues and in the sera of chronic pancreatitis patients (pure chronic pancreatitis) by using in situ hybridization, Western blot analysis, and enzyme-linked immunosorbent assay. In situ hybridization revealed no detectable ANG messenger RNA (mRNA) signals in all tissues of pure chronic pancreatitis and normal pancreas. Only a small amount of protein band expression was obtained in all of the protein lysates of pure chronic pancreatitis and normal pancreas. Accordingly, there was no significant difference between the mean serum ANG concentration of chronic pancreatitis patients (352.1+/-72.5 ng/ml) and that of healthy volunteers (357.6+/-45.2 ng/ml). By contrast, acinar cells and interstitial fibroblasts in the tissues surrounding pancreatic cancer showed increased ANG mRNA expression. Strong protein band expression was obtained in the protein lysates of pancreatic cancer surrounding tissue, and mean serum ANG concentration was increased in pancreatic cancer patients. These findings suggest that ANG expression is increased in pancreatic cancer surrounding tissue but is not increased in pure chronic pancreatitis, and that ANG is potentially involved in the pancreatic cancer microenvironment rather than the establishment of pure chronic pancreatitis.     

Experimental chronic pancreatitis in the pig

Chronic pancreatitis was induced in 22 piglets by dividing all pancreatic attachments to the duodenum; five sham-operated piglets served as controls. Two piglets died of postoperative complications. The animals were autopsied 2, 4, or 6 weeks postoperatively. All operated animals developed chronic pancreatitis. Concomitant with the development of interstitial fibrosis, an increasing progressive atrophy of the exocrine parenchyma occurred, with preservation of the islets of Langerhans. This atrophy and fibrosis were considerable already after 2 weeks. In one piglet only there was some acute inflammation and fat necrosis, whereas all showed at least moderate chronic inflammation, which did not change with time. The growth of the piglets stopped, and all had diarrhoea, which was thought to reflect exocrine insufficiency. Two animals (9%) developed a large pancreatic pseudocyst, and all animals had wide pancreatic ducts. The endocrine function was undisturbed. Intravenous glucose tolerance tests showed that the animals did not become diabetic. This model is appropriate for the study of experimental pancreatitis.     

胰腺纤维化后结缔组织生长因子的表达及意义

目的 观察胰腺纤维化后结缔组织生长因子(connective tissue growth factor,CTGF)在胰腺组织内的表达,探讨其意义。方法 通过高脂饲料诱导大鼠胰腺纤维化模型,16周后处死大鼠,取胰腺组织常规病理检查,天狼猩红染色和免疫组织化学染色检测胰腺纤维化组织胶原蛋白I、α-SMA及CTGF蛋白表达。结果 胰腺纤维化后,胰腺小叶和腺泡萎缩,小叶间隙增宽,间质内纤维组织明显增生;胰腺组织内胶原蛋白Ⅰ的合成较正常胰腺明显增加(1207.3±115.5比166.7±78.4,P＜0.01),α-SMA 表达量较正常胰腺组织增高(1500.2±255.8比57.4±23.2,P＜0.01),CTGF表达较正常胰腺明显增加(2950.5±431.9比382.2±190.8,P＜0.01),且胰腺星状细胞(PSCs)大量活化。结论 CTGF是胰腺纤维化的重要作用因子,其作用与PSCs活化密切相关。