BACKGROUND:Magnetic nanomaterials,as a hot topic in the biomedical field in recent years,are often used to enhance the targeted delivery of drugs to the affected area.OBJECTIVE:To investigate the effects of magnetic nano drug carriers on skeletal muscle injury markers and inflammatory responses in rats with sports injuries.METHODS:Magnetic nanoparticles were prepared.A total of 88 male SD rats were randomly divided into a blank group(n=8),an injury control group(n=32),a Yunnan Baiyao group(n=24),and a magnetic nano-drug carrier group(n=24)by using a random number table method.The latter three groups were modeled with exercise-induced muscle injury(treadmill slope of-16°,running speed of 16 m/min,and training time of 120 min).Immediately after exercise,after verifying the success of the model,Yunnan Baiyao patch was applied to the gastrocnemius muscle of the rats in the Yunnan Baiyao group.Yunnan Baiyao patch loaded with magnetic nanoparticles was applied to the gastrocnemius muscle of the rats in the magnetic nano-drug carrier group.At 24,48,and 120 hours after exercise,blood was drawn from the abdominal aorta of rats to detect the activities of creatine kinase and lactate dehydrogenase,as well as the levels of myoglobin,interleukin-6,and tumor necrosis factor-α.Hematoxylin-eosin staining was used to observe the infiltration of inflammatory cells in the gastrocnemius muscle.RESULTS AND CONCLUSION:(1)Compared with the blank group,the levels of myoglobin,creatine kinase,lactate dehydrogenase and tumor necrosis factorα in the injury control group at 24,48 and 120 hours after exercise were increased(P＜0.05),and the level of interleukin 6 at 24 and 120 hours after exercise was increased(P＜0.05).Compared with the injury control group,the level of myoglobin in the Yunnan Baiyao group at 24 and 48 hours after exercise was decreased(P＜0.05),the activities of creatine kinase and lactate dehydrogenase at 24,48 and 120 hours were decreased(P＜0.05),and the levels of interleukin 6 and tumor necrosis factor α at 120 hours after exercise were decreased(P＜0.05).Compared with the Yunnan Baiyao group,the level of myoglobin in the magnetic nano-drug carrier group at 24 and 48 hours after exercise was decreased(P＜0.05),the activities of creatine kinase and tumor necrosis factor α at 48 and 120 hours after exercise were decreased(P＜0.05),and the lactate dehydrogenase activity was reduced(P＜0.05).(2)Hematoxylin-eosin staining showed that a large number of inflammatory cells infiltrated in the muscle fibers of the injury control group 24 hours after exercise,and then the inflammatory cell infiltration gradually decreased,and the local damaged muscle fibers began to regenerate 120 hours after exercise.A large number of inflammatory cells infiltrated in the muscle fibers of the Yunnan Baiyao group and the magnetic nano-drug carrier group 24 hours after exercise,and then the inflammatory cell infiltration gradually decreased,and the damaged muscle fibers were regenerating 120 hours after exercise,and there was no significant difference from the blank group.(3)The results show that Yunnan Baiyao patch combined with magnetic nanoparticles can accelerate the recovery of exercise-induced muscle injury in rats,and the effect is better than that of Yunnan Baiyao alone.

BACKGROUND:Magnetic nanomaterials,as a hot topic in the biomedical field in recent years,are often used to enhance the targeted delivery of drugs to the affected area.OBJECTIVE:To investigate the effects of magnetic nano drug carriers on skeletal muscle injury markers and inflammatory responses in rats with sports injuries.METHODS:Magnetic nanoparticles were prepared.A total of 88 male SD rats were randomly divided into a blank group(n=8),an injury control group(n=32),a Yunnan Baiyao group(n=24),and a magnetic nano-drug carrier group(n=24)by using a random number table method.The latter three groups were modeled with exercise-induced muscle injury(treadmill slope of-16°,running speed of 16 m/min,and training time of 120 min).Immediately after exercise,after verifying the success of the model,Yunnan Baiyao patch was applied to the gastrocnemius muscle of the rats in the Yunnan Baiyao group.Yunnan Baiyao patch loaded with magnetic nanoparticles was applied to the gastrocnemius muscle of the rats in the magnetic nano-drug carrier group.At 24,48,and 120 hours after exercise,blood was drawn from the abdominal aorta of rats to detect the activities of creatine kinase and lactate dehydrogenase,as well as the levels of myoglobin,interleukin-6,and tumor necrosis factor-α.Hematoxylin-eosin staining was used to observe the infiltration of inflammatory cells in the gastrocnemius muscle.RESULTS AND CONCLUSION:(1)Compared with the blank group,the levels of myoglobin,creatine kinase,lactate dehydrogenase and tumor necrosis factorα in the injury control group at 24,48 and 120 hours after exercise were increased(P＜0.05),and the level of interleukin 6 at 24 and 120 hours after exercise was increased(P＜0.05).Compared with the injury control group,the level of myoglobin in the Yunnan Baiyao group at 24 and 48 hours after exercise was decreased(P＜0.05),the activities of creatine kinase and lactate dehydrogenase at 24,48 and 120 hours were decreased(P＜0.05),and the levels of interleukin 6 and tumor necrosis factor α at 120 hours after exercise were decreased(P＜0.05).Compared with the Yunnan Baiyao group,the level of myoglobin in the magnetic nano-drug carrier group at 24 and 48 hours after exercise was decreased(P＜0.05),the activities of creatine kinase and tumor necrosis factor α at 48 and 120 hours after exercise were decreased(P＜0.05),and the lactate dehydrogenase activity was reduced(P＜0.05).(2)Hematoxylin-eosin staining showed that a large number of inflammatory cells infiltrated in the muscle fibers of the injury control group 24 hours after exercise,and then the inflammatory cell infiltration gradually decreased,and the local damaged muscle fibers began to regenerate 120 hours after exercise.A large number of inflammatory cells infiltrated in the muscle fibers of the Yunnan Baiyao group and the magnetic nano-drug carrier group 24 hours after exercise,and then the inflammatory cell infiltration gradually decreased,and the damaged muscle fibers were regenerating 120 hours after exercise,and there was no significant difference from the blank group.(3)The results show that Yunnan Baiyao patch combined with magnetic nanoparticles can accelerate the recovery of exercise-induced muscle injury in rats,and the effect is better than that of Yunnan Baiyao alone.

Objective: To investigate the factors associated with CD4⁺ /CD8⁺ T lymphocyte ratio normalization in acquired immunodeficiency syndrome (AIDS) patients after antiretroviral therapy (ART). Methods: The data of 1 188 human immunodeficiency virus (HIV)/AIDS patients from the national ART reporting system in Yuxi City, Yunnan Province between January 1, 2006 and December 31, 2016 were retrospectively collected and analyzed. The rate of CD4⁺ /CD8⁺ T lymphocyte ratio normalization after ART was calculated by lifetable. Cox proportional hazard models were used to analyze the factors associated with CD4⁺ /CD8⁺ T lymphocyte normalization in AIDS patients after ART. The Wilcoxon rank sum test was used for comparison between groups. Results: The follow-up time was 3.8 (1.0-10.8) years. CD4⁺ /CD8⁺ T lymphocyte ratio normalization was documented in 95 patients with the rate of 1.89 per 100 person-years (95% confidence interval(CI) 1.52-2.27) after ART. The average time from ART to CD4⁺ /CD8⁺ T lymphocyte ratio normalized was 9.4 years. The cumulative normalization rate was 0.02 for the first year, 0.06 for the third year, 0.11 for the fifth year, 0.19 for the seventh year and 0.37 for the ninth year. By Cox proportional hazard models, the probability of CD4⁺ /CD8⁺ T lymphocyte ratio normalization in patients infected HIV by heterosexual contacts was 3.709 (95%CI 1.781-7.726) times higher than those by intravenous injection. The probability of CD4⁺ /CD8⁺ T lymphocyte ratio normalization in patients with baseline CD4⁺ T lymphocytes of 350-499 and more than 500 cell/μL groups were 2.792 (95%CI 1.196-6.519) and 3.832 (95%CI 1.648-8.913) times higher than those with baseline CD4⁺ T lymphocytes less than 200 cell/μL, respectively. The probability of normalization after ART in patients with higher baseline CD4⁺ /CD8⁺ T lymphocyte ratio was higher than those with baseline CD4⁺ /CD8⁺ T lymphocyte ratio≤ 0.20 (hazard ratio>1, all P<0.01). Conclusion The CD4⁺ /CD8⁺ T lymphocyte ratio normalization in AIDS patients after ART is associated with baseline CD4⁺ T lymphocyte counts, baseline CD4⁺ /CD8⁺ T lymphocyte ratio and HIV transmission mode.

Objective: To investigate the changes of proportion on both consistent condom use and syphilis infection among low-fee female sex workers aged 35 and above (LFSW), in order to provide evidence for targeted intervention strategies. Methods: A total of six cities-Liuzhou city and Pingnan couty of Guigang city of Guangxi Zhuang Autonomous Region, Jinghong city of Xishuangbanna Dai autonomous prefecture and Dali city of Dali Bai autonomous prefecture of Yunnan province, Zhangjiajie city and Jianghua Yao autonomous county of Yongzhou city Hunan province were involved in this study, with 60 eligible participants needed in each city, estimated through a pre-study. The first cross-sectional survey was completed from October 2012 to January 2013. Face-to-face questionnaire interview was carried out to collect information on socio-demography, work-related information and condom use situation. Blood was collected for syphilis testing. The second cross-sectional survey was carried out from June to September, 2015 under the same procedure. Results: A total of 371 and 403 eligible participants were included in the first and second survey, respectively. When comparing the two surveys, we noticed that the average age showed a slight change, from 42.4 years to 43.8 years old (t=3.537, P<0.001) and the average price for every commercial sex exchange increased from 36.8 RMB to 49.5 RMB (t=11.961, P<0.001). In the first survey, 46.9% (174/371) of the participants had more than two years of experience working as LFSW, compared to 61.3% (247/403) in the second survey (χ(2)=16.125, P<0.001). Also, 46.9% (174/371) of the participants consistently used condoms with clients in the past month in the first survey versus 64.3% (259/403) (χ(2)=23.641, P<0.001) in the second one. Rates of syphilis infection were found from 15.9% (59/371) in the first survey reduced to 7.2% (29/403) in the second survey (χ(2)=14.533, P<0.001). Conclusion: Compared with the first survey, the proportion of consistent condoms use showed an increase. Although the proportion of syphilis infection decreased in the second survey, the scope did not meet the criteria on syphilis, set by the government. Targeted intervention strategies on condom promotion and syphilis control should be implemented consistently in this population.
Adult ; China/epidemiology* ; Condoms/trends* ; Cross-Sectional Studies ; Female ; Humans ; Prevalence ; Risk Factors ; Safe Sex ; Sex Work ; Sex Workers ; Sexually Transmitted Diseases/epidemiology* ; Surveys and Questionnaires ; Syphilis/prevention & control* ; Syphilis Serodiagnosis

Objective To study the real-time gait behavioral changes in rat models of experimental diabetic peripheral neuropathy.Methods Twenty-five SPF Sprague-Dawley rats were randomly divided into experimental group ( 6 males and 7 females) and control group (6 males and 6 females).Diabetes was induced in rats by intraperitoneal injection of streptozotocin ( STZ ) in a dose of 45 mg/kg.The gait behavior in all rats was tested at 12 weeks after diabetes modelling.Results Compared with the control group, the rats with diabetic peripheral neuropathy showed statistically significant different walk cycle extension, walk speed, average print intensity, balance and coordination.The abnormal gait behavior of the rat models was mainly reflected in the increased average and each foot walk cycle extension ( P<0.01 ) , average intensity (P<0.05), absolute average body rotation (P<0.01),and shortened both homologous coupling and homolateral coupling( P <0.05 ) .Conclusions Experimental rat models of diabetic peripheral neuropathy can exhibit obvious changes of gait behavior, and may provide a reference for related clinical and basic research.

OBJECTIVETo explore the effects on cell proliferation and invasion as well as molecular basis after suppressing EZH2 expression in endometrial carcinoma cells by using siRNAs.

METHODSRT-PCR was used to examine the expression of EZH2 in endometrial carcinoma and their paracancerous tissues. SiRNAs targeting to EZH2 were transfected to endometrial carcinoma cells, and MTT, FACS, and boyden assays were utilized to examine cell proliferation, cell cycle change, and cell invasion. Finally, the molecular mechanisms of EZH2 on cell function alteration were investigated.

RESULTSCompared with paracancerous tissues, increased expression trend of EZH2 mRNA was showed in endometrial carcinoma tissues. Further, knocking down EZH2 expression inhibited cell growth, cell cycle transition from G1 to S phase, and cell invasion ability. Molecular basis indicated that suppression of EZH2 downregulated the expression of E2F1 and MMP9 and upregulated tumor suppressor p21 expression.

CONCLUSIONEZH2 expression is increased in endometrial carcinoma tissues. Knocking down EZH2 expression suppresses the cell growth, cell cycle transition and cell invasion by downregulated E2F1 and MMP9, and upregulated tumor suppressor p21 expression.

Cell Line, Tumor ; Cell Proliferation ; E2F1 Transcription Factor ; metabolism ; Endometrial Neoplasms ; genetics ; pathology ; Enhancer of Zeste Homolog 2 Protein ; Female ; Genes, Tumor Suppressor ; Humans ; Matrix Metalloproteinase 9 ; metabolism ; Polycomb Repressive Complex 2 ; genetics ; RNA Interference ; RNA, Messenger ; genetics ; RNA, Small Interfering ; Transfection