ABSTRACT
Objective:To establish an animal model of acute systemic cold injury in mice.Methods:There were 98 C57BL/6 mice, half male and half female, with body weight of 22-27 g and age of 10 weeks. The mice were randomly divided into 7 groups ( n=14) according to the changes of anal temperature in cold environment, namely, group A (38.5 ± 1) ℃, group B (35 ± 1) ℃, group C (30 ± 1) ℃, group D (25 ± 1) ℃, group E (20 ± 1) ℃, group F (15 ± 1) ℃, and group G (10 ± 1) ℃, among which, group A was the blank control group, and the rest groups were the experimental group. The mice in the blank control group were placed in the normal environment (20 ± 5) ℃, and the mice in the experimental group were placed in the low temperature artificial climate box at - 20℃. The anal temperature of the mice was measured intermittently (as the core temperature), and the time required for the core temperature of the mice to drop to groups B, C, D, E, F and G was recorded. The righting reflex was used to evaluate the consciousness state, the action ability and the general state of each organ of mice were observed, and the blood routine and HE staining of each organ were detected. Results:The lower the core temperature of the experimental group, the longer the time required. The consciousness state, action ability, general state of organs, blood routine, and HE staining of organs in groups B, C, and D were basically the same as those in group A, and there was no acute systemic cold injury. Therefore, the blood routine, general observation of organs, and HE staining of organs in groups B, C, and D were no longer displayed compared with those in group A. Compared with group A, mice in group E began to suffer from disturbance of consciousness and action ability. With the decrease of core body temperature, the damage was aggravated, and mice in group G died. Compared with group A, the indices of blood routine test (WBC, RBC, HGB, PLT) of mice in group E began to decrease, and the univariate variance calculation showed that only WBC changes had statistical significance ( P<0.05). Compared with groups A and E, the indices of blood routine test (WBC, RBC, HGB, PLT) of mice in group F were further reduced, and the changes of each index in univariate variance calculation were statistically significant ( P<0.05). The general observation results showed that compared with group A, the lung, liver and spleen surfaces of mice in group E began to darken, and compared with groups A and E, the lung, liver, spleen, kidney and heart of mice in group F were further deepened and darkened, with irregular edges. HE staining results of various organs showed that compared with group A, the mice in group E began to have partial alveolar structure destruction and a small amount of inflammatory cell infiltration, the central vein of the liver was slightly congested, and the red and white pulp of the spleen were indistinct. Compared with groups A and E, the pathological structure damage of the lung, liver, spleen, kidney, heart and brain tissues of the mice in group F was further aggravated. Conclusions:Detection of consciousness state, action ability, general state of organs, blood routine and HE staining indices of organs in mice under low temperature can simulate the progress of clinical acute cold injury, and the animal model of acute systemic cold injury was successfully prepared.
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Objective To investigate the effects of Maiqi-Jiangtang pill on the glycolipid level in type 2 diabetic ob/ob mice.Methods The 8-week old male ob/ob mice were randomly divided into Maiqi-Jiangtang pill high- (8 g/kg), medium- (4 g/kg), low- (2 g/kg) dose groups. All the mice orally adiministered with the drugs once a day for 10 weeks. The same week age normal C57BL/6J control mice and ob/ob model group mice were orally administered with the equal volume solvent. The body weight per week were recorded. The fasting blood-glucose (FBG) was measured by glycemic instrument. The content of TG, TC, HDL-C, LDL-C in serum, and TG and TC content in liver were determined by biochemical method. The liver index was calculated.Results Compared with ob/ob model group, there was no significant change in body weight of mice administered with Maiqi-Jiangtang pill for 10 weeks. Compared with the model group, the low-, medium- dose Maiqi-Jiangtang pill could significantly decrease the FBG (7.43 ± 1.71 mmol/L,7.84 ± 1.09 mmol/L vs.8.95 ± 0.96mmol/L), the high- dose Maiqi-Jiangtang pill could significantly reduce the TG (0.93 ± 0.16 mmol/L vs.1.18 ± 0.26 mmol/L) and LDL-C (2.10 ± 0.51 mmol/L vs.2.56 ± 0.44 mmol/L) content in serum of ob/ob mice (P<0.05), increase the HDL-C/LDL-C ratio (2.40 ± 0.39vs.1.96 ± 0.24) in serum (P<0.01), decrease the liver weight (3.52 ± 0.26 gvs. 3.98 ± 0.35 g) and the liver index (0.063 ± 0.004vs. 0.071 ± 0.006) (P<0.05). Compared with the model group, the low dose Maiqi-Jiangtang pill could also significantly decrease the TG level (0.63 ± 0.25 mmol/gvs. 1.05 ± 0.67 mmol/g) in liver and significantly increase the HDL-C/LDL-C ratio (2.30 ± 0.44vs. 1.96 ± 0.24) in serum (P<0.05).Conclusions The Maiqi-Jiangtang pill can reduce lipid in serum and liver of ob/ob mice while it can decrease the blood glucose, which need to further study its mechanism.
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BACKGROUND:Under different induction conditions,bone marrow mesenchymal stem cells can differentiate into the mesodermal tissues such as osteoblasts,chondroblasts,muscle cells,adipocytes and so on.OBJECTIVE:To verify the effect on repairing the rabbit articular cartilage injury using bone marrow mesenchymal stern cells (MSCs)induced by tissue engineering method.DESIGN,TIME AND SETTING:Randomized controlled animal experiment was performed in the Clinical Center Laboratory of Shenyang Medical College between May 2005 and December 2007.MATERIALS:Twenty health New Zealand rabbits,irrespective of genders,aged 2-3 months,were used.METHODS:①Rabbit bone marrow MSCs were cultured in vitro,experiment group was cultured for one week withdexamethasone,basic fibroblast growth factor and vitamin C,then for additional 3 weeks with transforming growth factor-β instead of basic fibroblast growth factor;calls without inductors served as controls;②Twenty rabbits were used to establish knee articular cartilage defect models,which were then divided into three groups at random. Experiment group (n=5) was transplanted with the induced bone marrow MSCs;control group with the non-induced cells;blank control group with saline. At 2,4,6,8 weeks postoperation,two rabbits in the experiment group were killed,while one animal in control group and blank control group was killed for the index determination.MAIN OUTCOME MEASURES:①Cell morphology. ②Alkaline phosphatase activities.③General observation. ④X-ray observation.⑤Histological observation.RESULTS:①The morphology of the induced bone marrow MSCs was changed,from long fusiform to polygon,which was similar to cartilage calls-like morphology.②After the bone marrow MSCs were induced for 4 weeks,the alkaline phosphatase activities were obviously enhanced(P＜0.05).③Eight weeks after transplantation,the specimens in the experiment group exhibited smooth surface and unclear outlines with surrounding cartilage;X-ray results showed joint space broadened,subchondral bone sack was improved;histological slices observation revealed similarity with normal chondrocytes.CONCLUSION:Autologous MSCs transplantation can repair articular cartilage injury.