Objective To investigate the therapeutic effect of modified powder and vitamin B12 on the treatment of recurrent oral ulcer in rats and its effect on serum interleukin-6 (IL-6) and tumor necrosis factor alpha(TNF-α).Methods Forty-eight male Sprague-Dawley (SD) rats were randomly divided into normal group (equal distilled water),model group (equal distilled water),positive control group (levamisole 20 mg/kg gavage) and experimental group (containing dcsgd crude drugs 1 g/mL,1.278 mL/200 g+ B12 20 g/kg gavage),each group with 12 rats.Model group,positive control group and experimental group were treated with immunological method to establish the recurrent oral ulcer mode.Each group treated with the corresponding treatment methods for 20 days.Results The oral ulcer number,duration time in positive control group and the experimental group were significantly lower than that in model group rats(P＜0.05),ulcer interval time was significantly longer than the rats in the model group (P＜0.05);the serum IL-6,TNF-α detection level in positive control group and experimental group were significantly lower than in the model group(P＜0.05);serum IL-6,TNF-α detection level in model group were significantly higher than those in normal group(P＜0.05);the peripheral blood SOD,GSHPx levels in positive control group and experimental group rats were significantly higher than that in model group(P＜0.05),the level of MDA was significantly lower than that in model group (P＜0.05).Conclusion Modified powder and vitamin B12 have therapeutic effects on recurrent oral ulcer in rats.The mechanism may be related to reducing the inflammatory reaction and improving the antioxidant capacity of the tissue.

Objective To investigate the protective effect of umbilical cord mesenchymal stem cells (UCMSCs) on traumatic brain injury (TBI) in rats.Methods Thirty healthy Sprague-Dawley rats (10 rats for each group) were randomly divided into normal control group (normal),model group (injection of saline after TBI) and UCMSCs transplantation group (injection of UCMSCs after TBI).The rats in experimental groups were sacrificed on the 10th day after UCMSCs transplantation.The percentage of UCMSCs in brain tissue was detected by flow cytometry.The pathological changes of brain tissue were observed by hematoxylin-eosin (HE) staining method.The expressions of vascular endothelial growth factor (VEGF),glial fibrillary acidic protein (GFAP) and brain-derived neurotrophic factor (BDNF) in brain tissue were measured by immunohistochemistry and immunofluorescence double staining.The neurological deficit was evaluated by neurological deficit degree.Results The percentage of CD90,CD73 and CD105 cells in the UCMSCs transplantation group was significandtly higher than that in the model group (0.4％ vs 0.1％,P＜0.05).The results of HE staining showed that the brain injury of the transplanted group was alleviated compared with the model group (P＜0.05).The VEGF of the brain tissue in injury area in the UCMSCs transplantation group was higher than that in the model group (P＜0.05).The number of GFAP and BDNF positive cells in the UCMSCs transplantation group was higher than that in the model group (P＜0.05),and the neurological deficit score was also higher than that in the model group (P＜0.05).Conclusions UCMSCs transplantation for the treatment of TBI rats can effectively reduce the vascular damage in the injury area and promote nerve recovery.