Dose-effect relationship between epidermal growth factor and its protection of the intestinal tract from the radioactive damage / 中国组织工程研究

ABSTRACT

BACKGROUND: Epidermal growth factor can inhibit gastric acid secretion, promote the healing from the ulcer, protect mucous membrane, and enhance the growth and proliferation of mucous membrane cells of the gastrointestinal tract.OBJECTIVE: To investigate the effect of epidermal growth factor at different doses on the barrier function of the intestinal mucous membrane in rats after radioactive damage.DESIGN: A randomized controlled trial.SETTING: Department of Clinical Trophology, First Affiliated Hospital and College of Public Health.MATERIALS The experiment was completed at the Public Health Department of Xinjiang Medical University and the First Affiliated Hospital of Xinjiang Medical University from August 2001 to May 2003. Totally 80 newborn Wistar rats, half male and half female, were involved in the study.METHODS: Wistar rats were randomly divided into the control groups(positive and negative) and intervention groups(30 μg/kg, 20 μg/kg, 10 μg/kg) with 16 rats in each group and half male and half female. The models were made by a single radiation of 9.5Gy on the abdomen except for the negative control group. Epidermal growth factor was injected subcutaneously once per day for intervention. Eight days later, the body mass, food intake, efficiency of food utilization were observed and the morphology of the intestinal mucous membrane was checked.dermal growth factor on the increased body mass, food intake and food intake observation of the intestinal mucous membrane under the optic microscope and the electric-microscope.group of rats with epidermal growth factor of 30, 20, 10 μg/kg and the intake of the female and male rats in the group with epidermal growth factor of 30, 20, 10 μ g/kg was significantly different compared with that of the rats in the negative control group( P ＜ 0.05), while there was no significant under the optic microscope and electric microscope showed that when epidermal growth factor was administrated, epidermal growth factor could apparently improve the intestinal mucosal barrier function with the increase of the dose, especially in the group with epidermal growth factor of 30 μ g/kg,which indicates that epithelial cells were increased obviously and cup shaped cells were also increased.CONCLUSION: Epidermal growth factor might not affect the body mass,food intake and efficiency of food intake of the rats, but large doses of epidermal growth factor can improve the morphology of the intestinal mucous membrane and promote the proliferation and repairs.