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OBJECTIVE: Keeping a wound moist can allow effective and rapid healing, and it can control the formation of scabs, thereby allowing cell proliferation and epithelial formation. When regularly changing a dressing, thermosensitive hydrogel as a moist dressing does not cause a secondary wound from adhesion. The main aim of this study was to evaluate the effect of a new sprayable thermosensitive hydrogel on wound healing. METHOD: The hydrophobic N-acetyl group of chitin was removed by microwave reaction with lye until the degree of acetylation was 60%, followed by reaction with propylene oxide to obtain hydroxypropyl chitin (HPCH) with a degree of substitution of 40%. After mixing HPCH with fish scale collagen (FSC), a thermosensitive hydrogel with a gel temperature of 26.5°C was obtained. Ampelopsis brevipedunculata extracts (ABE), which have been found to accelerate wound repair and improve healing, were added. HPCH/FSC is not toxic to the mouse L929 cell line and forms a hydrogel at body surface temperature. It can be easily sprayed on a wound. The HPCH/FSC has a three-dimensional network porous structure with a swelling ratio of 10.95:1 and a water vapour transmission rate of 2386.03±228.87g/m2/day; it can facilitate the penetration of water and air, and promote absorption of wound exudate. Wound repair was performed on five Sprague-Dawley rats. Each rat had three wounds, which were treated with medical gauze, HPCH/FSC and HPCH/FSC/ABE, respectively. RESULTS: The wounds in the HPCH/FSC/ABE group recovered the fastest in vivo, the mature wound site was smoother, the re-epithelialisation was even and thicker, and the angiogenesis developed rapidly to the mature stage. CONCLUSION: In this study, HPCH/FSC/ABE thermosensitive hydrogel was shown to effectively accelerate wound healing and was convenient for practical application.
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Ampelopsis , Hidrogéis , Camundongos , Ratos , Animais , Hidrogéis/farmacologia , Quitina/química , Quitina/farmacologia , Ratos Sprague-Dawley , Cicatrização , Colágeno/farmacologiaRESUMO
Silver nanoparticles (AgNPs) synthesized from Aloe vera extract exhibited a pronounced antibacterial effect, while the Ampelopsis brevipedunculata extract (ABE) showcased a high antioxidant capacity for wound healing. Spherical AgNPs with a particle size of 28.82 nm crystallized in a face-centered-cubic lattice. AgNPs/polyvinyl alcohol (PVA) and ABE/polycaprolactone (PCL) underwent electrospinning to produce coaxial and electrosprayed nanofibers, respectively. The developed coaxial nanofibers demonstrated a strain of 159%, a Young's modulus of elasticity of 7080.14 kPa, a 3.9-fold swelling ratio, a water contact angle of 38.91°, characteristic hydrophilicity, and an adequate water vapor transmission rate of 2272 g/m2/day. ABE exhibited no cytotoxicity to L929 cells and induced a twofold increase in the cell migration rate. Upon applying the developed coaxial nanofiber on an in vivo rat model with a 9 mm wound diameter, the wound rapidly and completely healed within 10 days, with a healing speed 60% greater than that of the control group. Histopathological analysis revealed that the coaxial group did not exhibit inflammation, showed complete epithelization, and featured a well-arranged deposition of collagen on the 10th day.
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Ampelopsis , Nanopartículas Metálicas , Nanofibras , Ratos , Animais , Prata/farmacologia , Cicatrização , Antibacterianos/farmacologiaRESUMO
Objective This study aimed to understand the herpes simplex virus-2 (HSV-2) infection and related factors among female drug abusers in the women's compulsory drug rehabilitation center of Shandong province and to provide reference for the prevention and control of HSV-2 in these settings.Methods We screened all of 451 female drug abusers in the women's compulsory drug rehabilitation centers in of Shandong province and conducted a study using both questionnaire investigation and serological tests for HSV-2,HIV and syphilis.We also used EpiData 3.1 software to establish a database and SPSS 20.0 software to conduct the x2 test and multivariate logistic regression analysis.Results A total of 451 female drug abusers were under study.We noticed that the rates for HSV-2 infection,HIV infection and syphilis infection appeared as 72.1% (325/451),2.2% (10/451) and 33.5 % (151/451) respectively.Results from univariate analysis showed that factors as:awareness on AIDS,having temporary sex partner after using the drug,having multiple sex partners after using the drug,providing commercial services or having temporary sex practice before being detained,with syphilis infection etc.,were associated with HSV-2 infection.Data from the multivariate analysis showed that the OR (95%CI) value of HSV-2 infection was 2.90 (1.19-7.06) for those who providing commercial service,when comparing to those who did not.Compared to those who did not suffer from syphilis infection,the OR (95%CI) value of HSV-2 infection for those with syphilis infection was 2.75 (1.63-4.63).Conclusions The rate of HSV-2 infection was high in the women's compulsory drug rehabilitation center of Shandong province.We should enhance measures and promote condom use to prevent from HSV-2 and other sexually transmitted diseases among them.
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Objective To explore the causes of secondary drug resistance among HIV infected persons who were receiving antiretroviral therapy in Shandong province,and provide evidence for the improvement of antiretroviral therapy strategy.Methods A case-control study was designed with 1 ∶ 2 matching on case and control groups.Household and face-to-face interview were conducted in October,2015.All the study subjects were screened from both the drug resistant database of antiretroviral therapy of Shandong provincial laboratory and national comprehensive HIV/AIDS database in Shandong.The sample size was estimated as 330 cases including 110 drug resistant and 220 non-drug resistant cases.Subjects were people living with HIV/AIDS (PLWHA) aged 15 or older and received antiretroviral therapy for more than 6 months with records of virus load (VL).Subjects who presented VL above 1 000 copies/ml would receive drug resistance testing.Subjects who were confirmed resistant to with secondary drug,were selected as case group,the rest subjects with non-secondary drug resistance would form the control group.EpiData 3.1 software and SPSS 22.0 software were used to establish a database.Related influencing factors were analyzed with non-conditional stepwise logistic regression model.Results A total of 288 cases were enrolled,including 103 in the case and 185 cases in the control groups,with average age as (37.62 ± 1.06) years and (37.90 ± 0.74)years old,respectively.Most of them were male,married/cohabitant,with education level of junior/senior high school or below and under Han nationality.Results from the multivariate logistic regression model showed that ORs (95%CI) of receiving antiretroviral therapy for 1-3 years,or more than 3 years were equal to 8,80 (3.69-21.00),3.00 (1.20-7.53),compared with receiving antiretroviral therapy less than one year,respectively.OR (95% CI) of Among the PLWHA that with missing rate above 25.0% on medication,the OR appeared as 15.41(4.59-51.71),compared with not missing medication.OR (95% CI) among those who took the medicine themselves was 0.22 (0.07-0.74).Conclusions Factors as duration of treatment,missing rate on medication and taking medicine by oneself were of influence on secondary drug resistance.Other factors as duration on antiretroviral therapy longer than 1 year,missing rate above 25.0% on medication,were related to the risk on secondary drug resistance.However,if the medicine was taken by oneself,it served as a protective factor for secondary drug resistance.It is necessary to strengthen the intervention and health education programs related to antiretroviral therapy.
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Objective: This study aimed to understand the herpes simplex virus-2 (HSV-2) infection and related factors among female drug abusers in the women's compulsory drug rehabilitation center of Shandong province and to provide reference for the prevention and control of HSV-2 in these settings. Methods: We screened all of 451 female drug abusers in the women's compulsory drug rehabilitation centers in of Shandong province and conducted a study using both questionnaire investigation and serological tests for HSV-2, HIV and syphilis. We also used EpiData 3.1 software to establish a database and SPSS 20.0 software to conduct the χ(2) test and multivariate logistic regression analysis. Results: A total of 451 female drug abusers were under study. We noticed that the rates for HSV-2 infection, HIV infection and syphilis infection appeared as 72.1% (325/451), 2.2% (10/451) and 33.5% (151/451) respectively. Results from univariate analysis showed that factors as: awareness on AIDS, having temporary sex partner after using the drug, having multiple sex partners after using the drug, providing commercial services or having temporary sex practice before being detained, with syphilis infection etc., were associated with HSV-2 infection. Data from the multivariate analysis showed that the OR (95%CI) value of HSV-2 infection was 2.90 (1.19-7.06) for those who providing commercial service, when comparing to those who did not. Compared to those who did not suffer from syphilis infection, the OR (95%CI) value of HSV-2 infection for those with syphilis infection was 2.75 (1.63-4.63). Conclusions: The rate of HSV-2 infection was high in the women's compulsory drug rehabilitation center of Shandong province. We should enhance measures and promote condom use to prevent from HSV-2 and other sexually transmitted diseases among them.
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Feminino , Humanos , Usuários de Drogas , Infecções por HIV/epidemiologia , Herpes Genital/epidemiologia , Herpes Simples/epidemiologia , Herpesvirus Humano 2/isolamento & purificação , Tratamento de Substituição de Opiáceos , Prevalência , Fatores de Risco , Testes Sorológicos/métodos , Comportamento Sexual , Parceiros Sexuais , Centros de Tratamento de Abuso de Substâncias , Transtornos Relacionados ao Uso de Substâncias/reabilitação , Sífilis/epidemiologiaRESUMO
Objective: To explore the causes of secondary drug resistance among HIV infected persons who were receiving antiretroviral therapy in Shandong province, and provide evidence for the improvement of antiretroviral therapy strategy. Methods: A case-control study was designed with 1∶2 matching on case and control groups. Household and face-to-face interview were conducted in October, 2015. All the study subjects were screened from both the drug resistant database of antiretroviral therapy of Shandong provincial laboratory and national comprehensive HIV/AIDS database in Shandong. The sample size was estimated as 330 cases including 110 drug resistant and 220 non-drug resistant cases. Subjects were people living with HIV/AIDS (PLWHA) aged 15 or older and received antiretroviral therapy for more than 6 months with records of virus load (VL). Subjects who presented VL above 1 000 copies/ml would receive drug resistance testing. Subjects who were confirmed resistant to with secondary drug, were selected as case group, the rest subjects with non-secondary drug resistance would form the control group. EpiData 3.1 software and SPSS 22.0 software were used to establish a database. Related influencing factors were analyzed with non- conditional stepwise logistic regression model. Results: A total of 288 cases were enrolled, including 103 in the case and 185 cases in the control groups, with average age as (37.62±1.06) years and (37.90±0.74) years old, respectively. Most of them were male, married/cohabitant, with education level of junior/senior high school or below and under Han nationality. Results from the multivariate logistic regression model showed that ORs (95%CI) of receiving antiretroviral therapy for 1-3 years, or more than 3 years were equal to 8.80 (3.69-21.00), 3.00 (1.20-7.53), compared with receiving antiretroviral therapy less than one year, respectively. OR (95%CI) of Among the PLWHA that with missing rate above 25.0% on medication, the OR appeared as 15.41(4.59-51.71), compared with not missing medication. OR (95%CI) among those who took the medicine themselves was 0.22 (0.07-0.74). Conclusions: Factors as duration of treatment, missing rate on medication and taking medicine by oneself were of influence on secondary drug resistance. Other factors as duration on antiretroviral therapy longer than 1 year, missing rate above 25.0% on medication, were related to the risk on secondary drug resistance. However, if the medicine was taken by oneself, it served as a protective factor for secondary drug resistance. It is necessary to strengthen the intervention and health education programs related to antiretroviral therapy.
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Adulto , Humanos , Lactente , Masculino , Fármacos Anti-HIV , Terapia Antirretroviral de Alta Atividade , Estudos de Casos e Controles , Resistência a Medicamentos , HIV/isolamento & purificação , Infecções por HIV/tratamento farmacológico , Modelos LogísticosRESUMO
Objective To investigate the role of miR‐26a in ox‐LDL‐mediated apoptosis of HAECs in endothelial cells and its mechanism .Methods Various concentrations of ox‐LDL were added in HAECs culture .Cell cytotoxicity and apoptosis were moni‐tored by MTT and TUNEL assay ,and expression level of miR‐26a examined by qRT‐PCR .Overexpression of miR‐26a mimic in HAECs ,MTT and TUNEL staining were used to detect the activity and apoptosis of ox‐LDL .The 3′UTR of luciferase reporter vector pMIR‐PTEN was constructed and the predicted target gene of miR‐26a was identified by luciferase activity assay .QRT‐PCR and Western blot were used to detect the mRNA and protein expression of PTEN .Results ox‐LDL could mediate the toxic death and apoptosis of HAECs cells ,and decrease the expression level of miR‐26a in HAECs cells .Overexpression of miR‐26a mimic could inhibit the cytotoxicity and apoptosis of ox‐LDL cells after HAECs .Transfection of miR‐26a mimics significantly inhibited lu‐ciferase activity (P<0 .05) .The expression of mRNA and protein in HAECs cells was significantly down regulated by transfection of miR‐26a analog (P<0 .05) .Conclusion MiR‐26a can inhibit the cytotoxicity and apoptosis of ox‐LDL cells after HAECs inhibi‐tion ,and the possible mechanism of action is to down regulate the expression of PTEN .The study suggests that miR‐26a may be a potential target for the treatment of atherosclerosis related to apoptosis .
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Objective To investigate the effect and mechanism of pulmonary artery pressure on exercise capacity after acute high altitude exposure .Methods A total of 231 persons were recruited in this study , whose vital signs,SaO2 and physical working capacity ( PWC170 ) exercise capacity were collected .The difference between groups with normal and increased MPAP was observed .Results mean pulmonary artery pressure ( MPAP ) and right ventricle ( RV )-Tei index increased substantially after acute high altitude exposure ,while PWC170 was remarkably decreased .Furthermore,it was found that those whose MPAP increased(MPAP≥25 mmHg)had higher RV-Tei and lower PWC170(P<0.01) in acute high altitude exposure group .Correlation analysis suggested that there were different levels of correlation between MPAP, RV-Tei and PWC170(P<0.01).Conclusion After acute high altitude exposure , the increased pulmonary artery pressure is one of the main causes of lowered exercise capacity .The mechanism may be associated with the decrease of right heart functions .
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Objective To investigate the risk factors of pulmonary hypertension (PH) after rapid ascent to high altitude in healthy young Chinese men .Methods A total of 552 non high altitude natives ( healthy young Chinese men ) were recruited in the study between June to August in 2012.The subjects were delivered to high altitude (3700 m) in 2 h by plane from low altitude (450 m).Demographic data including smoking , alcohol consumption , high altitude exposure histo-ry, body mass index (BMI) and age were collected within 24 h after arrival at 3700 m.Furthermore, the oxygen saturation ( SaO2 ) , blood pressure , heart rate , pulmonary artery systolic pressure were measured using the echocardiography system . Analysis of risk factors of PH was performed by logistic regressions .Results The incidence of PH was 23.10%.SaO2 was significantly lower in the higher-pulmonary artery systolic pressure group (higher-PASP)[(86.10 ±3.34)%] than that in the normal-PASP group [(89.09 ±2.65)%, P<0.01].Smoking, alcohol consumption, high altitude exposure history, BMI, age, systolic blood pressure , diastolic blood pressure , heart rate were not significantly different between the two groups mentioned above .Logistic regressions revealed that lower SaO 2 (OR:0.711,95% CI:0.647-0.782, P<0.01) was an independent risks factor of PH .Conclusion Low SaO2 is an independent risk factor of PH upon rapid arrival at 3700 m in healthy young Chinese men .However, smoking, alcohol consumption , high altitude exposure history , BMI, age, blood pressure and heart rate are not risk of PH .These observations will provide valuable clues to theoretical studies on PH and prevention of PH .