Objective:To investigate the optimal administration approach of using aspirin by observing the effects of the rats in-testinal mucosal barrier and somatostatin receptors level with different administration approaches of using non-steroid anti-inflammatory drugs-aspirin.Methods:32 SD rats were randomly divided into 4 groups:oral intake group,enema group,intraperitoneal injection group and control group.Every group had 8 rats.The ileum mucosal injury was scored.The level and distribution of SSTRs in every group was detected by ELISA and immunohistochemistry, respectively, The IOD score in each group was measured by image analysis.Results:(1) The scores of ileum mucosal injury in aspirin experimental groups were significantly higher than that in control group (P<0.05), but there were no difference among aspirin experimental groups.( 2 ) All subtypes of SSTR were expressed in rat intestinal mucosa.However,SSRT1 and SSTR2 were expressed mainly ( P<0.05 ).( 3 ) The expressions of SSTR1-5 on intestinal mucosa in aspirin experimental groups were significantly less than that in control group (P<0.05).(4) There was incompletely no same effects of SSTR1-5 in intestinal mucosa by different approaches ( P<0.05 ).( 5 ) There were no significant difference of SST concentration and IOD score among all groups ( P>0.05).Conclusion:Aspirin can damage the rat intestinal mucosa.Aspirin could lead to the decrease of SSTR1-5 expression in the intestinal mucosa.All subtypes of SSTR in rat small intestine mucosa were expressed, suggesting that aspirin could affect the barrier function of the intestine.There were different influences on SSTR1-5 expression by different administration approaches,suggesting aspirin by parenteral approach may reduce the intestinal damage.

Objective:To investigate the changes of somatostatin ,epidermal growth factor receptor ,prostaglandin E2 and mucus of ileum in SD rats injected aspirin.Methods:32 SD rats were randomly divided into 4 groups:oral intake group ,coloclyster group ,in-traperitoneal injection group and normal control group.Ileal tissue sections were stained by Alcian blue.The positive area and IOD of Alcian blue was counted by image analysis in each group.The concentration of SST ,EGFR and PGE2 were detected by ELISA immuno-histochemistry ,and the IOD of each index was measured by image analysis in each group.Results:The score of ileum mucosal injury were highest in aspirin treatment groups ( P<0.05 ) ,but the score was no difference among aspirin treatment groups.The area and IOD of mucus in aspirin treatment groups were less than normal control group .The Area ( 602.17 ±158.03 ) and level of IOD ( 249.54 ± 113.19) in intraperitoneal injection group was the lowest (P<0.05).There were no differences of level of SST ,EGFR was observed among all groups .The concentration and IOD of PGE2 in normal control group was the highest (P<0.05).However,his discrepancy was not obvious among three groups of aspirin.Conclusion: Aspirin, in the four routes of administration , can cause damage to the mucosa of the rat small intestine in two weeks.The integrity of the small intestinal mucosa and mucus secretion were damaged significantly ,and it was the worst in intraperitoneal injection group.These changes might be correlated with the reduction of PGE 2.No clear results showed that the SST and EGFR were involved in the pathophysiology of the NSAIDs .