Experimental and clinical study of lactulose in obstructive jaundice

The role of lactulose in preventing endotoxaemia in obstructive jaundice has been investigated. A prospective study was performed on 24 consecutive patients with obstructive jaundice undergoing surgery. Twelve patients were given oral lactulose before operation and were compared with twelve controls. Endotoxaemia was reduced in peroperative portal (P less than 0.05) and postoperative systemic (P less than 0.05) blood samples in the lactulose treated group, and a significant fall (P less than 0.05) occurred in the postoperative 24 h creatinine clearances in controls compared with the lactulose treated group. Results from animal experiments in which oral lactulose reduced endotoxin related mortality in obstructive jaundice (P less than 0.05), and the in vitro demonstration of a direct anti-endotoxic action of lactulose suggest that its beneficial action is due in part to an inactivation of endotoxin.     

胆汁转流性外引流术对恶性梗阻性黄疸血内毒素水平的影响

目的 :探讨外引流术体外转流胆汁对恶性梗阻性黄疸病人血内毒素水平的影响。方法 :对 14例肿瘤手术不能切除的恶性梗阻性黄疸病人行胆汁转流性外引流术 ,与同期施行的 15例内引流术、2 0例外引流术病人进行手术前后外周血内毒素水平比较。结果 :术前 3组内毒素水平差别无显著性意义 (P>0 .0 5 )。单纯外引流组手术后内毒素水平略高于术前 (P >0 .0 5 ) ;内引流组术后第 2天内毒素水平反而高于术前 (P <0 .0 5 ) ,第 7天、第 14天显著降低 (P <0 .0 5 ,P <0 .0 1) ;体外转流组术后内毒素水平逐渐降低 ,与内引流术组变化基本相同。结论 :胆汁转流性外引流术可降低恶性梗阻性黄疸病人外周血内毒素水平。     

Prevention of postoperative renal failure in patients with obstructive jaundice--the role of bile salts

Preoperative administration of the simple bile salt sodium deoxycholate has been shown in this study to prevent postoperative endotoxaemia and renal failure in patients with obstructive jaundice. Fifty-four per cent of jaundiced patients not given the salt were found to have systemic endotoxaemia, associated with renal impairment in two-thirds of the cases. No patient given sodium deoxycholate 500 mg 8 hourly for 48 hours before operation had portal or systemic endotoxaemia, and none had evidence of renal impairment (P less than 0 X 02, X2 with Yates' correction). The incidence of endotoxaemia in untreated jaundiced patients was very significantly greater than in non-jaundiced patients undergoing elective upper abdominal surgery (P less than 0 X 005), but this difference is abolished by the prophylactic administration of the oral bile salt. The mechanism of action of bile salts in preventing endotoxin absorption from the small bowel has been investigated, and the lack of any significant alteration in the small bowel microbial flora in obstructive jaundice suggests that a direct effect on the endotoxin molecule is involved. Nearly 20 per cent of patients with obstructive jaundice still develop postoperative renal insufficiency, but preoperative prophylactic use of sodium deoxycholate should reduce this very significantly.     

Influence of the Gut Microflora and of Biliary Constituents on Morphological Changes in the Small Intestine in Obstructive Jaundice

Increased amounts of intestinal endotoxin are absorbed in obstructive jaundice. The precise mechanism is not known but the increased absorption may arise from alterations in the luminal contents, in the intestinal flora, in the gut wall or in interactions between all three. To examine the effects of the intestinal flora we have compared the morphological changes in the small intestine in obstructive jaundice in germ free and conventional rats while the effects of bile constituents have been examined by addition of bile constituents to the diet of bile duct ligated rats. Changes in the intestine were examined, histologically, by enzyme histochemistry, and by transmission and scanning electron microscopy. The results showed no differences in response between germ free and conventional rats. Feeding of diets containing bile salts exacerbated the lesion. Feeding of diets containing cholesterol, however, reduced the degree of intestinal changes produced by cholestasis and completely antagonised the increase in damage caused by feeding of bile salts.     

The Role of Endotoxaemia in the development of Renal Disorders Experimental Obstructive Jaundice in Rats

In rats with 2-week obstructive jaundice the sensitivity to endotoxin was studied and the effect of a single dose of endotoxin on histological development in the kidney, liver and spleen was also investigated. We were tested the effect on accumulation and distribution within organs, of fibrinogen labelled with radioactive iodine 125. We showed an increased sensitivity to endotoxin in obstructive jaundice. The cause of death in most rats was acute circulatory failure during the course of endotoxic shock, without clinical features of disseminated intravascular coagulation. In the isotope study, after endotoxin administration there was a specific dynamic increase of fibrinogen accumulation in the kidneys of rats with obstructive jaundice. We proposed, that the cause of the kidney changes during the course of obstructive jaundice could be the local activation of intrarenal coagulation.     

去氢胆酸钠治疗阻塞性黄疸内毒素血症的实验研究

目的:观察去氢胆酸钠降低阻塞性黄疸时血清内毒素的效果。方法:将CD大鼠随机分成对照组、胆总管结扎组和胆总管结扎-胆盐治疗组,测定各组血清胆红素、免疫球蛋白IgG、IgM和内毒素。结果:胆总管结扎-胆盐治疗组血清内毒素明显下降（P<0．01）,血清免疫球蛋白IgG、IgM有较明显升高。结论:口服去氢胆酸钠可能有助于降低阻塞性黄疸的血清内毒素。     

Effect of activated protein C on impaired fibrinolysis in rats with obstructive jaundice.

We studied the effect of activated protein C (APC) on impaired fibrinolysis using a rat model in which disseminated intravascular coagulation (DIC) is induced by the intravenous injection of endotoxin in rats with obstructive jaundice. An intravenous injection of endotoxin in rats with obstructive jaundice resulted in pulmonary hemorrhages and a marked increase in the plasma levels of tissue-type plasminogen activator (t-PA) antigen and plasminogen activator inhibitor activity. Prophylaxis with APC before the injection of endotoxin resulted in a decrease of the number of lung hemorrhages and an accelerated release of t-PA antigen. Thus, DIC in obstructive jaundice may be due to impairment of fibrinolysis and an increased susceptibility of endothelial cells to endotoxin. APC may be effective as a treatment for patients with obstructive jaundice associated with DIC.     

Effect of Bile Acid Replacement on Endotoxin-induced Tumor Necrosis Factor-a Production in Obstructive Jaundice

There is a high incidence of perioperative morbidity and mortality in patients with obstructive jaundice due to sepsis. Tumor necrosis factor-a (TNF-a) is considered a crucial mediator in inducing and processing the inflammatory cascade. We hypothesize that obstructive jaundice leads to an increased endotoxin-induced TNF-a production and that intestinal bile acid replacement can prevent this phenomenon. Sprague-Dawley rats were randomized to three groups of 12 animals each. Group 1 underwent common bile duct ligation (CBDL) with oral intestinal bile acid (deoxycholic acid 5 mg/100 g body weight/3 times daily) replacement (CBDL + bile acid); group 2 underwent common bile duct ligation with the same amount of normal saline replacement orally (CBDL + saline); and group 3 underwent a sham operation (sham control). After 2 days, endotoxin was given to the animals, and after 90 minutes, tissues (liver and lung) and blood were collected for checking the TNF-a levels and biochemical analyses. Comparisons among these three groups were performed and recorded. While serum and tissue (liver and lung) TNF-a levels of group 2 (CBDL + saline) were significantly increased after endotoxin challenge, these elevations were reduced to control levels (sham control) following oral replacement of intestinal bile acid (CBDL + bile acid). Obstructive jaundice leads to an increased endotoxin-induced TNF-a production and intestinal bile acid replacement can inhibit this phenomenon.     

The nitric oxide donor molsidomine improves survival and reduces hepatocyte apoptosis in cholestasis and endotoxemia

BACKGROUND: Cholestasis and endotoxemia have been demonstrated to cause hepatocyte apoptosis through caspase-mediated pathways. In vitro nitric oxide (NO) donors reduce hepatocyte apoptosis and caspase activation in several models. The nitric oxide donor molsidomine improves survival in an in vivo model of endotoxemia. We tested the effect of molsidomine on survival and hepatocyte apoptosis in a model of obstructive jaundice and endotoxemia. STUDY DESIGN: Sprague-Dawley rats underwent common bile duct ligation on day 1. On day 3, animals were given either 100 mg/kg of molsidomine or an equivalent volume of saline, and 30 minutes later they were given endotoxin 3 mg/kg or 10 mg/kg intravenously. Animals were sacrificed 4 or 16 hours after endotoxin injection. Serum samples were analyzed for alanine aminotransferase and frozen liver samples were analyzed for caspase 3 activity. Paraffin-embedded liver sections were assayed for apoptosis using the terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling assay. Survival was measured in a separate experiment in which animals underwent the same protocol, but were given three different doses of endotoxin and were observed for 72 hours before sacrifice. RESULTS: At endotoxin 3 mg/kg, the 72-hour survival in saline-treated animals was 92%, which decreased to 45% at 10 mg/kg and to 29% at 15 mg/kg. All of the molsidomine-treated animals survived all endotoxin doses. Alanine aminotransferase was reduced in molsidomine-treated animals compared with those treated with saline. Apoptosis was attenuated in molsidomine-treated animals. Caspase 3 activity was decreased in molsidomine-treated animals compared with those given saline. CONCLUSIONS: Molsidomine attenuates caspase activation and hepatocyte apoptosis and improves survival after cholestatic endotoxic injury.     

舒胆合剂防治阻塞性黄疸肾功能障碍的作用机制

目的 探讨在阻塞性黄疸(OJ)时舒胆合剂的抗内毒素及对肾功能的保护作用。方法 SD大鼠胆总管结扎后分3组，每组10只，分别用2mL舒胆合剂、乳果糖液(每100mL含乳果糖67g)、生理盐水灌胃，连用9d。假手术组10只，用2mL生理盐水灌胃。观察内毒素、血和肾组织中内皮素(ET)、一氧化氮(NO)的含量、一氧化氮合酶(NOS)活性及肾功能的变化。结果 舒胆合剂组与乳果糖组血内毒素、血和肾组织ET水平较生理盐水组明显降低，血和肾组织N0、NOS活性、内生肌酐清除率、肾皮质血流量较生理盐水组明显升高。结论 在OJ时，中药舒胆合剂有抗内毒素作用，并通过减少体内内毒素水平来降低体内ET水平，升高N0水平起到保护肾功能的作用。     

Endotoxemia after surgery in digestive diseases

The blood level of endotoxin after operations in patients with digestive diseases, mainly liver cirrhosis and obstructive jaundice, and the complications most likely related to the presence of endotoxemia were investigated. Twenty-seven patients without either liver cirrhosis or obstructive jaundice showed a minimal elevation of the endotoxin level in blood, as shown by 6.1 +/- 3.9 pg/ml at the first postoperative day and there was only one anastomotic leakage. On the other hand, 18 patients with liver cirrhosis showed a notable and persistent endotoxemia after surgery. The cirrhotic patients who especially underwent splenectomy and hepatectomy showed marked elevations of endotoxin level at the first postoperative day, with values of 151.0 +/- 46.1 pg/ml and 101.3 +/- 36.2 pg/ml, respectively, and one of these patients died of hepatic failure. Thirteen patients with obstructive jaundice developed endotoxemia evidenced by the value of 21.6 +/- 4.8 pg/ml at the first day after surgery. Among these patients, two had gastrointestinal bleeding and one developed DIC. The markedly high and persistent levels of endotoxin in patients with liver cirrhosis or obstructive jaundice may be possibly related with the development of MOF.     

Circulating immune complex, endotoxin, and biliary infection in patients with biliary obstruction

Immunoglobulin A-containing circulating immune complexes, immunoglobulin G-containing circulating immune complexes, and endotoxin were measured in the sera of patients with obstructive jaundice. The bile of patients with percutaneous transhepatic biliary drainage was also cultured for bacteriologic studies. There was a significantly positive correlation between the endotoxin levels and both immunoglobulin A-containing circulating immune complex and immunoglobulin G-containing circulating immune complex. The endotoxin levels of the patients with gram-negative infections were significantly increased compared with those of the patients with sterile cultures. The immunoglobulin G-containing circulating immune complex levels of the patients with bacteria in bile were significantly increased compared with those of the patients with sterile cultures. The immunoglobulin A-containing circulating immune complex levels of the patients with bacteria in bile were slightly increased, but the difference did not reach statistical significance. These results indicate that one of the causes of increased circulating immune complex levels may be endotoxemia in combination with biliary infection in patients with biliary obstruction.     

诱生型一氧化氮合酶在阻塞性黄疸肝损害中的调控作用

目的：通过体内、外实验，探讨诱生型一氧化氮合酶（iNOS）在阻塞性黄疸肝损害中的调控作用。方法：（1）　体外实验：采用胶原酶原位肝灌注法分离大鼠肝细胞，行原代培养后，用iNOS抑制剂SMT作用于肝细胞，50μmol/L 甘氨鹅脱氧胆酸钠(GCDC) 作用后用流式细胞术（FCM）及原位末端标记法（TUNEL）检测肝细胞凋亡情况。（2）体内实验：结扎大鼠胆总管, 结扎后3，7，14，21d, 分别用TUNEL法及免疫组化SABC法检测大鼠肝组织细胞凋亡状态及iNOS蛋白的表达。结果：（1） 随SMT浓度的增加，肝细胞的凋亡明显减少。（2）大鼠胆总管结扎后随结扎时间的延长细胞凋亡指数(AI)升高，结扎14d后AI达高峰。iNOS蛋白表达越强, 则AI越高。结论：iNOS参与阻塞性黄疸肝细胞凋亡的调节，并在阻塞性黄疸肝损害的发生和发展中起重要作用。     

Thromboxane as a possible hepatotoxic factor increased by endotoxemia in obstructive jaundice

In a study using rats, we investigated whether liver damage induced by endotoxemia in obstructive jaundice is associated with thromboxane (TX) in order to acertain whether its vasoconstrictive and platelet aggregating properties play a role in reducing liver blood flow. The rats were divided into the following 5 groups; a control group, an endotoxin (Et) group, a bile duct ligation (BDL) group, a bile duct ligation and endotoxin (BDL + Et) group and an OKY046 (Thromboxane synthetase inhibitor) treated bile duct ligation + endotoxin (OKY-BDL + Et) group. The blood TXB2 levels in the Et, BDL and BDL + Et groups were higher than those in the control group. The liver TXB2 levels in the Et and BDL + Et groups were also higher than those in the control group. Liver phospholipids and liver blood flow decreased in the BDL + Et group, whereas in the OKY-BDL + Et group they returned close to the control group levels by decreasing the TXB2 levels in both the liver and blood to normal. These results suggest that the high level of TX in the blood and liver tissue may further aggrevate the liver during endotoxemia in obstructive jaundice by inhibiting liver blood flow.     

内毒素引起阻塞性黄疸大鼠肾功能障碍的机制

目的 探讨阻塞性黄疸(obstructive jaundice,OJ)时内毒素引起肾功能障碍的机制.方法 SD大鼠60只,胆总管结扎后,分5 d(B1),10 d(B2),15 d(B3)三组,每组各10只,同时建立相应对照组(A1,A2,A3),另30只胆总管结扎后分3组(SHUD,LAC,NS),每组各10只,分别用2 ml舒胆合剂、乳果糖液、生理盐水灌胃,连用9 d.观察内毒素、血和肾组织中内皮素(endothelin,ET)、一氧化氮(nitric oxide,NO)的含量、一氧化氮合酶(nitric oxide synthase,NOS)活性及肝、肾功能的变化.结果 血内毒素与血、肾组织ET含量,ET/NO比值呈显著正相关(P＜0.05,r=0.630,0.438,0.496,0.453),与肌肝清除率(creatinine clearance,Ccr)和肾皮质血流量(renal cortical blood flow,BCBF)呈显著负相关(P＜0.05,r=-0.600,-0.410).血、肾组织ET/NO比值与Ccr,RCBF呈显著负相关(P＜0.05,r=-0.449,-0.558,-0.626,-0.731).血和肾组织内NO水平与内毒素水平呈负相关(P＜0.05,r=-0.518,-0.441),与Ccr、RCBF呈正相关(P＜0.05,r=0.422,0.496,0.400,0.659).SHUD组与LAC血内毒素、ET水平组明显降低,血和肾组织NO,NOS活性以及Ccr,RCBF较NS组明显升高.结论 OJ时内毒素可通过刺激ET的释放,提高ET/NO比值,使肾内缩血管因子与扩血管因子比例失调而损伤肾功能.     

Study on mechanism of onset of endogenous endotoxemia during obstructive jaundice--with special reference to involvement of biliary infection

To clarify how biliary infections affect onset of endogenous endotoxemia during obstructive jaundice, I tried to review the clinical result of 104 cases of obstructive jaundice, and conducted a Limulus test of portal and peripheral blood in 20 cases of obstructive jaundice and an animal study using 38 rabbits. In cases of obstructive jaundice complicated by biliary infections, clinical improvement of jaundice became significantly unfavorable, and the outcome of surgical operation was significantly inferior to the cases without biliary infections. The endotoxin positive rate in the portal blood of obstructive jaundice was 65% (13 of 20 cases), among which 10 cases (79.6%) was also positive in the peripheral blood. Of these 10 cases, 7 cases manifested endogenous endotoxemia with no infectious focus, and prognosis of these cases was poor. The endotoxin positive rate in portal blood of obstructive jaundice group was also significantly higher than that of non-jaundice group in animal study, and when the reticuloendothelial system was blocked, the endotoxin positive rate in the peripheral blood showed an increasing tendency. In the animal group with experimental cholangitis, all the endotoxin positive animals in the portal blood were also positive in the peripheral blood. This result suggests that biliary infections accelerate a decrease in the reticuloendothelial function during obstructive jaundice. From these results, endogenous endotoxemia seems to affect the onset of various complications during obstructive jaundice and unfavorable prognosis.     

阻塞性黄疸时肠粘膜免疫功能变化的实验研究

阻塞性黄疸(阻黄)病人机体免疫功能受到抑制。本实验目的是研究阻黄时肠粘膜免疫功能的改变。实验包括阻黄组和对照组,采用胆总管结扎制造阻黄模型,以胆汁外引流组作为对照,每组15只动物。制造阻黄模型后2周,取小肠检测肠液中分泌型IgA(S-IgA)浓度、肠粘膜内淋巴细胞体外刺激转化能力、粘膜固有层内淋巴细胞亚群。结果显示:与对照组相比,阻黄鼠肠液S-IgA浓度降低;肠粘膜内淋巴细胞刺激转化能力降低;粘膜固有层内含IgA浆细胞、CD4阳性和CD8阳性淋巴细胞数目减少,差别有显著性(P>0.05)。因此,我们认为阻黄时肠粘膜免疫功能受到明显抑制。     

Transhepatic endoprosthesis of the bile ducts

The authors analysed the results of percutaneous transhepatic endoprosthetics of the hepaticocholedochus in 38 patients with incurable tumors of the organs of the hepato-pancreato-duodenal zone, complicated by obstructive jaundice. Nine different types of bile ejection blocking were distinguished, according to which the method and tactics of the endobiliary intervention were elaborated. Measures for the prevention of cholangitis, bleeding into the abdominal cavity, and hemobilia in the postoperative period are described in detail. The article shows the results recorded in flow-up periods of one to 11 months in 26 patients who had been subjected to endoprosthetics of the bile ducts and discharged from the clinic for out-patient treatment. Recurrence of obstructive jaundice caused by incrustation of the prosthesis was encountered only in 2 patients 4 and 9 months after the intervention. This allowed the authors to conclude that endoprosthetics of the hepaticocholedochus is very effective in the treatment of patients with obstructive jaundice of neoplastic etiology and to consider a transhepatic intervention an alternative of a surgical operation.     

蛙皮素对梗阻性黄疸大鼠的肝脏保护性实验研究

目的探讨蛙皮素对梗阻性黄疸大鼠肝脏的保护作用。方法40只Wistar雄性大鼠随机分成4组：正常组、假手术组、阻黄组、阻黄＋蛙皮素治疗组。术后第10天，检测下腔静脉血ALT、BIL-T、LPS值，测定肝脏氧化应激SOD、MDA、GSH、GST水平，光镜观察肝脏组织结构，免疫组化表达肝脏MCP-1。结果蛙皮素降低ALT、LPS水平，减轻肝脏氧化应激，减少汇管区炎症细胞浸润，弱化MCP-1免疫组化阳性表达，对BIL-T无影响。讨论蛙皮素对梗阻性黄疸大鼠肝脏损伤有保护作用，这一结果为l临床治疗胆道梗阻肝脏损害提供一种新的方法。     

雷帕霉素在大鼠梗阻性黄疸模型中对肝脏保护作用的研究

目的：探讨雷帕霉素对大鼠梗阻性黄疸肝脏保护作用的相关研究。方法：采用胆总管结扎方法建立大鼠梗阳性黄疸模型,将54只SD大鼠随机分为假手术组（A）组18只,梗阻性黄疸（B）18只,梗阳性黄疸＋STAT抑制剂雷帕霉素RPM处理组（C）18只。分别于术后1、3、5d处死大鼠,显色基质法测定各组内毒素含量,取肝脏组织测定超氧化物歧化酶（SOD）活性和丙二醛（MDA）含量,RT-PCR测肿瘤坏死因子基因表达。结果：B和C组TNF-α mRNA表达水平均增加,B组较C组内毒素水平含量低,肿瘤坏死因子基因表达水平低,SOD活性相对高,MDA含量低,有显著差异。结论：梗阻性黄疸时TNF-α表达明显升高,通过雷帕霉素干预,肝组织TNF-α 的表达下降,SOD活性增加,MDA含量减少,可防止梗阳性黄疸所致失控性炎症反应性肝损伤。