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Objective To explore the therapeutic effects and mechanisms of umbilical cord mesenchymal stem cells(UC-MSCs)implantation on knee osteoarthritis(OA)in rabbits. Methods The healthy adult New Zealand rabbits were divided into control group(n=4),OA model group(n=4),and treatment group(n= 4).OA model was induced by 4% papain injection(0.1 ml/kg for 2 times),and treatment group were treated with UC-MSCs implantation(1 ml,1×105/L).At 2 weeks after papain injection for preparation of osteoarthritis model,rabbits knee joints were examined by MRI,and synchrony serum levels of IL-6 and-8,MMP-3 and-13 were tested.At 3 weeks after papain injection for OA,1×106/L 1 ml UC-MSCs were injected into articular cavity in treatment group,and normal saline was injected into articular cavity in blank control group and OA model group.At 2 weeks and 4 weeks after the treatment,serum levels of IL-6 and IL-8,MMP-3 and MMP-13 were tested respectively.At 4 weeks after the treatment,knee joints were reexamined again by MRI.After this,the rabbits were sacrificed and synovium and articular cartilage were taken out for HE and immunohistochemistry examination.Serum levels of IL-6 and IL-8,MMP-3 and MMP-13 were tested by ELISA method. Results The levels of inflammatory cytokines such as IL-6,IL-8,MMP-3,MMP-13 were significantly higher in model group 〔(44.7 ± 14.5)μg/L,(7.6 ± 2.5)μg/L,(16.5 ± 4.3)μg/L,(4.50 ± 1.20)μg/L〕and in treatment group 〔(43.9 ± 15.2)μg/L,(9.8 ± 2.9μg/L),(18.3 ± 4.9) μg/L,(4.80 ± 1.80)μg/L〕than in control group〔(20.8 ± 11.2)μg/L,(1.2 ± 0.6)μg/L,(2.8 ± 0.9) μg/L,(0.02 ± 0.02)μg/L〕(all P < 0.05).The levels of IL-6,IL-8,MMP-3,MMP-13 were significantly lower after UC-MSCs treatment〔(23.8 ± 11.4)μg/L,(2.4 ± 1.3)μg/L,(10.5 ± 3.4)μg/L,(0.50 ± 0.20)μg/L〕than before treatment(all P<0.05).Based on magnetic resonance imaging,the treatment group versus model group showed an improved coarse cartilage surface,thickened subchondral bone and synovium,and decreased volume of joints effusion.Pathological finding showed lower levels of inflammatory reaction in cartilage and synovium in the treatment group versus model group.Immunohistochemistry showed lower levels of IL-6 and MMP-13(all P<0.05). Conclusions The inflammatory response of cartilage and synovial tissue induces OA progress,and the inflammation factors play a significant role in OA progress.UC-MSCs could protect cartilage and synovial membrane of joints and inhibit the inflammatory response.Therefore,this study provides new therapy method for OA.
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Objective To investigate the correlation between admission hyperglycemia and clinical prognosis in elderly patients with community-acquired pneumonia.Methods Based on the electrical medical record (EMR),information of the patients with pneumonia was retrospectively collected and the necessary data were prepared and arranged.Based on clinical outcomes,demographic characteristics and clinical indicators were compared between groups in order to screen potential variables affecting clinical outcomes.Then,the random blood glucose level 8.6 mmol/L was considered to be the cutoff point for grouping patients,with clinical outcomes as outcome variables,random blood glucose levels as grouping variables,propensity score value analysis method was applied along with the ratio of 1:1 nearest neighbor matching method to generate paired samples in order to assess the impact of blood glucose level on mortality rate;With hospitalization time serving as time variable,survive analysis method was used to analyze COX proportional model.Results Five hundred and fifty-eight patients were enrolled in the analysis,197 patients of which were recorded dead during hospitalization (the dead group).After the correction of demographic characteristics,past medical history and blood test indexes,white blood cells,C reactive protein,random blood glucose at admission and triglyceride levels were regarded as potential factors for the deaths of patients (P<0.05).However,the propensity score analysis method suggested that there was no significant difference between the blood glucose levels and mortality.The survival analysis showed that the mortality in the high blood glucose group was higher than that in the normal blood glucose group (HR=1.68,95%CI(1.22,2.31)).Conclusion Admission hyperglycemia is an important indicator of adverse prognosis in elderly patients with pneumonia.It may be of significance for screening and identifying high-risk patients.
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Objective:To investigate the effect of amylin on biomechanical property of the femur in glucocorticoid-induced osteoporosis rats. Methods:Four groups of female Wistar rats(3 months old) were treated for 12 weeks as follows: ⅠNormal Control;ⅡDXM;Ⅲ DXM+AMY;Ⅳ DXM+Vitamin D_3.By intramuscular injection of dexamethasone(DXM)1mg/kg twice a week during the first 8 weeks,the animal model of Glucocorticoid induced osteoporosis was established.After 12 weeks,biomechanical properties of the femur were measured. Results:After the treatment with AMY,Bone structural mechanical(diameter) and geometrical parameters(displacement,peak load) of the femur were significantly increased(vs.DXM group,P
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Objectives:To investigate the effects of amylin on bone minernal density and structure parameters of bone tissue in glucocorticoid induced osteoporosis rats. Methods:Four groups of female Wistar rats (3 months old) were treated for 12 weeks as follows: ⅠNormal Control, ⅡDXM, Ⅲ DXM+AMY;Ⅳ DXM+Vitamin Da 3. By intramuscular injection of dexamethasone(XM)1mg/kg twice a week during the first 8 weeks, the animal model of Glucocorticoid induced osteopoprosis was established. After 12 weeks, BMD of the lumbar vertebrae and the femural bone were measured by DEXA. The bone morphology of the lumbar vertebrae was also determined. Results:①After the treatment with AMY, bone mineral density (BMD) was significantly increased at the lumbar spine and the femural bone. ( vs. DXM group, P