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Objective@#To establish a mouse model of osteoarthritis (OA) and study the bone microarchitecture and bone metabolism of tibial subchondral bone in early stage of OA.@*Methods@#The mouse model of post-traumatic osteoarthritis (PTOA) with anterior cruciate ligament (ACLT) was established by using c57 mice. The Sham operation group served as the control group. All mice were fed with conventional diet. All mice were sacrificed after 4 weeks. The degeneration of knee joint was observed by HE staining and Safranin O-Fast Green staining. The number of osteoclasts was counted by TRAP staining. Micro CT was used to analyze the quantitative parameters of the microstructure of tibia subchondral bone in mice. Serum levels of bone resorption biomarker CTX I and cartilage degeneration marker CTX II were determined.@*Results@#After ACLT 4 weeks, the average score of OARSI in ACLT group was 3.2, which was higher than that in Sham group, and the joint degeneration occurred in mice, presenting the pathological characteristics of early OA. Compared with the sham operation phase, the total subchondral bone volume (TV) of ACLT group was 4.72 mm3, increased by 13.6%; the bone trabecular resolution (Tb.Sp) was 0.130 and 0.154 mm, respectively, and the ACLT group also increased by 18.8%; the bone volume/tissue volume (BV/TV) was 0.470 and 0.294, respectively, and the ACLT group decreased by 48.9%; the bone trabecular thickness (Tb.Th) was 0.162 and 0.083 mm groups, ACLT decreased by 37.5%. Trap staining showed that the number of osteoclasts per unit volume in ACLT group was 72, which was significantly higher than that in sham operation group. The CTX I of mice in the sham operated ACLT group and sham operated group were 20.9 ng/ml and 18.29 ng/ml, with an increase of 48.9% in the ACLT group; the CTX II of mice in the ACLT group and sham operated group were 35.5 ng/ml and 28.6 ng/ml, with an increase of 24.1% in the ACLT group.@*Conclusion@#ACLT Mouse model can successfully construct early OA, which confirms the early loss of osteochondral bone and the pathological changes of osteoclast activation in OA, and provides a new specific target for the treatment of OA.
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BACKGROUND:Herba epimedi, a traditional Chinese medicine, has a long time in dealing with various orthopedic disorders. Icarinwithmany biological activites is one of the most important compositions of Herba epimedi. OBJECTIVE:Toinvestigate the effects of icarin on osteogenic differentiation of mesenchymal stem cels and the underlying mechanisms. METHODS:Bone marrow mesenchymal stem cels were treated using icarin with or without osteogenic mediumin vitro. Osteogenic differentiation markers, including runt-related transcription factor 2, osteocalcin and osterix, were detected by real time-qPCR. Alizarin red staining was used to measure calcium nodes generated by osteoblasts induced frombonemarrow mesenchymal stem cels. The proximal tibia bone structure of rats fed with icarin (2 mgperday) for 5 weeks was detected and analyzed by MicroCT. RESULTS AND CONCLUSION:Icarin was able to promote the expression of genes related to osteogenic differentiation in the absence or presence of osteogenic induction. Icarin could obviously increase the quantity of calcium nodes whenmesenchymal stem celswere cultured in the osteogenic medium. The animal experiment showed that icarin improved formation of trabecular bone.
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Objective To observe the effects of different concentrations of glucose on the proliferation and differentiation of primary osteoblasts.Methods The identification of mouse primary osteoblasts was performed by alkaline phosphatase (ALP)staining and Von Kossa staining.Treating osteoblasts with different dose of glucose (5.5,15.5,25.5 mmol/L),the osteoblasts proliferation,ALP staining,and Runx2,OB markers ALP and OCN mRNA expression were observed.Real-time PCR was used for the determination of Runx2,OB markers ALP and OCN mRNA expression.Results With the increasing glucose concentrations,the osteoblasts cell proliferation was decreased.Compared with 5.5 mmol/L normal glucose,the ALP staining in 15.5 mmol/L group and 25.5 mmol/L group were decreased.The expressions were decreased by (36.7±6.2)％ and (38.3±2.2)％ in Runx2 mRNA,(26.7±7.2)％ and (40.4±4.3)％ in OCN mRNA respectively.ALP in 15.5 mmol/L group was reduced by (33.3±10.2)％,but increased by(50.8±10.4) ％ in 15.5 mmol/L group.Conclusions High glucose may decrease osteoblasts proliferation and activity,which may be one of the key pathogenesis factors of diabetic osteoporosis.
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Objective To investigate HIV infection via sex in Xinjiang,in order to provide guidance for the formulation of strategy to control and prevent sexual transmission of HIV.Methods Vistiors to 15 STD clinics in 5 cities of Xinjiang were asked to take blood and to be tested for HIV and RPR.At the same time,medical workers carried out the designed investigation.Result A total of 2 499 STD outpatients were investigated,among whom 28 samples were confirmed to be HIV positive and 145 samples were RPR positive;the infection rate was 1.12% and 5.80%,respectively,with male being 0.97% and female being 1.37% in the positive samples.The Han nationality had 8 HIV positive samples,and the Uygur nationality had 20 positive samples,with the positive rate being 0.44% and 3.49%,respectively.The Han nationality had 66 and the uygur had 79 in RPR positive samples,the positive rate being 3.66% and 13.79%,respectively.In 212 cases of syphilis 4 samples were HIV positive,the infection rate being 1.89%;in 420 cases of GU 10 samples were HIV positive,the infection rate being 2.38%.Our behavioral surveys found that those who 100% used condoms in their sex activities were free of HIV infection,while those who never used condoms had a high ratee of infection,up to 2.77%.Conclusion Sex transmission is becoming an important route of spreading HIV infection in Xinjiang,and therefore it is essential to strengthen serological and behavioral surveillance for high risk population and implement effective interventions for them.