ABSTRACT
Objective To determine the relationship between endothelin-l(ET-1)with blood flow of gastric mucosa and gastric mucosal injury (GMI) in obstructive jaundice rats induced by coldly restrainting stress. Methods 161 rats were randomly assigned into the experimental (obstructive jaundice) group (n=70), the control (sham operative) group (n=70) and the anti-ET-1 preconditioning group (n=21). The obstructive jaundice model was set up in the experimental group and the anti-ET-1 preconditioning group. Both the experimental group and the control group were re-assigned into 5 subgroups which underwent non-coldly restraint and coldly restraint for 10, 30, 60 and 120 min respectively. The anti-ET-1 preconditioning group underwent anti-ET-1 serum precondition 30,60 or 120min before the coldly restraint. The ET-1 was detected by radioimmunologic method and the gastric mucosal blood flow (GMBF) by laser Doppler flowmeter. Results The concentrations of ET-1 in gastric mucosa and ulcer index significantly increased (P
ABSTRACT
Objective To investigate the effect and the mechanism of intragastric administration of gentamicin and lactulose on stress ulcer in rats with obstructive jaundice.Methods Forty male Wistar rats were divided into 4 groups: Jaundice(Ligation of the bile duct) and intragastric administration of gentamicin and lactulose(group A),jaundice with intragastric glucose(group B),sham operation with intragastris gentamicin and lactulose(group C);and sham operation with intragastric glucose(group D).Two weeks after the operation,the respective intragastric administration was given for 7 days,and then the water immersion and restraint stress induction procedures were performed in the 4 groups.Endotoxemia levels in portal vein were measured by the Limulus test and the ulcer index was calculated.Results Group A showed significantly lower ulcer index and lower level of endotoxemia compared to group B,while the levels of endotoxemia and ulcer index in group B were increased,and group C and D also showed lower ulcer index and lower level of endotoxemia.Conclusions Endotoxemia is an important aggravating factor for stress ulcer in obstructive jaundice.Intragastric administration of lactulose and gentamicin can decrease the level of endotoxemia which is beneficial to reduce the incidence of stress ulcer in rats with obstructive jaundice.