Therapeutic effects of smecta on multiorgans injury induced by paraquat in rats

Objective To evaluate therapeutic effect and the possible mechanism of smecta on paraqual plasma concentrations and multiorgans injury induced by paraquat intoxication in rats. Methods A total of 76 healthy adult SD rats were randomly ( random number) divided into group A (control group n =6),group B ( poisoned group n =30 ),group C (smecta-treated group n=30).Rats in groups B and C were treated intragastrically with PQ at 50 mg/kg,the rats in the group C were given with smecta at 50 mg/kg,while the rats in the other two groups were only intragastrically adminstered with saline.Live rats in groups B and C were sacrificed at 2,6,24,48,72 h after administration of PQ for the determination of paraquat plasma concentrations and for HE staining of lung,stomach and jejunum.The rats were executed at the end of trial by the same way in group A.All measurement data were expressed as means + standard deviation ((x) ±s).The data of pathological score were compared with Independent-samples T test and the data of PQ concentration compared with analysis of variance (ANOVA) followed by LSD-t multiple comparison test.P-values of less than 0.05 were considered statistically significant.Results The paraquat plasma concentration ( ng/ml ) was 440.314 ± 49.776 to 4320.6150 ± 413.947.There were different pathological changes of lung,stomach and jejunum in group B. Lung injuries gradually deteriorated,congestion,edema,leukocyte infiltration,incrassated septa and lung consolidation were observed.The pathological changes were obvious such as abruption of mucosa,hyperemic gastric mucosa and leukocyte infiltration in stomach.Haemorrhage of jejunum mucosa,abruption of villus,gland damage and inflammatory cell infiltration were found. Compared with group B,all the pathological changes mentioned above were obviously alleviated in group C ( P ＜ 0.05 ),and the concentrations reduced ( P ＜ 0.01 ).Conclusions Smecta reduced paraquat plasma concentrations and alleviated pathologic injury of rats with PQ poisoning. Key words: Smecta; Paraquat; Plasma concentration; Pathological change; Therapeutic effect