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Objective To explore the effects of Cordyceps sinensis extract (CSE) on osteoporosis and RANKL-mediated osteoclastogenesis. Methods Bone marrow-derived macrophages (BMMs) was isolated from the bone marrow of C57BL/6 mice. CSE was added in osteoclast differentiation. Osteoclasts were stained by tartrate-resistant acid phosphatase (TRAP). The nearly mature osteoclasts were planted on hydroxyapatite plates and the area of bone lacunae was observed by microscope. The F-actin belt was stained by DAPI and phylloeptide and the number of nuclei was observed by confocal microscopy. The expressions of DC-STAMP, ATP6V0D2, TRAP, CTSK, and NFATC1 were detected by q-PCR. The protein expression of the MAPK pathway was detected by Western Blot. The in vivo experiments were carried out by administering CSE to the ovariectomized mice daily through gavage. After 6 weeks of intervention, mouse femurs were taken for morphological analysis. Peripheral blood was taken for ELISA. Results CSE represses osteoclastogenesis, bone resorption, F-actin belts formation, osteoclast specific gene expressions and MAPK signaling pathways in vitro. In vivo study indicated that CSE prevents OVX-induced osteoporosis and preserves bone volume by repressing osteoclast activity and function. It also increases the serum ALP, BGP content, and reduces TRAP content. Conclusion CSE can attenuate osteoclast formation and OVX-induced osteoporosis, suggesting potential clinical therapeutic effects for osteoporosis.
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This paper reported a neonate with periventricular nodular heterotopia associated to filamin A ( FLNA) gene mutation. The female patient was born at 29 +6 weeks of gestation to a mother who had intractable seizures and a history of two adverse pregnancy outcomes. Postnatal cranial ultrasound showed multiple hypoechoic masses on the walls of bilateral ventricles, which presented as "sawtooth pattern". MRI revealed gray matter displacement, unclear edge of gray and white matter, wavy bilateral ventricles and multiple nodular signals. Whole exon sequencing showed that the patient carried a maternally-inherited and likely pathogenic heterozygous mutation of chrX:153579307 in the FLNA gene (NM_00111 0556; p.Glu2376fsTer9), which caused the periventricular nodular heterotopia in the neonate. The patient was followed up until eight months of age and no convulsion or obvious abnormality in her growth or development was reported.
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Objective:To investigate the application effect of flipped classroom combined with micro-lectures in the teaching of pediatric infectious diseases.Methods:A total of 199 five-year students in the class of 2019 from Department of Pediatrics of Chongqing Medical University were divided into 14 groups. Each group selected a micro-lecture theme targeting the key and difficult points of the course and produced an original micro-lecture video through flipped classroom, which was then uploaded to Chaoxing platform for evaluation by teachers and students. At the end of the course, a questionnaire survey was performed to investigate the teaching effect, and final examination score and department examination score during internship were compared between the students in the class of 2019 and those in the class of 2018. SPSS 22.0 was used to perform the t-test, the Wilcoxon rank-sum test, the chi-square test, and the Fisher's exact test. Results:A total of 14 flipped micro-lecture works were completed by the students. The questionnaire survey showed that 98.47% (193/196) of the students thought that this model was helpful to master the key and difficult points; 93.88% (184/196) of the students thought that the flipped micro-lecture works had better originality and quality than reading reports and literature reviews in the past; 94.90% (186/196) of the students were more willing to accept the mode of flipped classroom combined with micro-lectures. Compared with the students in the class of 2018, the students in the class of 2019 had significantly higher final examination score (79.32±7.53 vs. 76.06±12.01, P<0.001), theoretical score of department examination (88.68±4.87 vs. 87.15±4.09, P<0.001), and operation score of department examination (84.93±7.56 vs. 82.08±9.10, P<0.001). Conclusion:Flipped classroom combined with micro-lectures can effectively solve the key and difficult points in the teaching of pediatric infectious diseases, and it can also stimulate the interest in independent learning and help to improve learning performance among students. Therefore, it holds promise for clinical application.
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Objective@#To provide reliable prediction models based on dentoskeletal and soft tissue variables for customizing maxillary incisor positions and to optimize digitalized orthodontic treatment planning. @*Methods@#This study included 244 Chinese women (age, 18–40 years old) with esthetic profiles after orthodontic treatment with fixed appliances (133 in group I: 1° ≤ The angle between the nasion [N]-A point [A] plane and the N-B point [B] plane [ANB] ≤ 4°; 111 in group II: 4° < ANB ≤ 7°). Dental, skeletal, and soft tissue measurements were performed on lateral cephalograms of the participants. Correlation and multiple linear regression analyses were used to determine the influence of dentoskeletal and soft tissue variables on maxillary incisor position. @*Results@#The ideal anteroposterior position of the maxillary incisor varied between sagittal skeletal patterns. The position of the maxillary incisor correlated with the sagittal discrepancy between the maxilla and the mandible (ANB), protrusion of the midface, nasal tip projection, development of the chin, and inclination of both the maxillary and mandibular incisors. Distance from the maxillary central incisor to nasion-pogonion plane predicted using multiple linear regression analysis was accurate and could be a practical measurement in orthodontic treatment planning. @*Conclusions@#Instead of using an average value or norm, orthodontists should customize a patient’s ideal maxillary incisor position using dentoskeletal and soft tissue evaluations.
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Objective To investigate the association between the osteogenic differentiation in the soft tissue lump and the clinicopathological characteristics of osteosarcoma patients. Methods We retrospectively reviewed the clinical data of conventional osteosarcoma patients with soft tissue lumps, including Enneking stages, chemotherapy sensitivity, overall survival and post-metastatic survival time. The ossification level in soft tissue lumps was assessed by imaging and the proportion of osteoid matrix was assessed by pathological examination. Results A total of 189 cases were included in this study. In patients with Enneking IIIB, non-osteoblastic, partially osteoblastic and osteoblastic types accounted for 30.2%, 9.6% and 6.3%, respectively. Non-osteoblastic osteosarcoma patients had a higher rate of initial metastasis (P < 0.05); Chemotherapy efficiency of non-osteoblastic, partially osteoblastic and osteoblastic types were 60.5%, 59.6% and 31.3%, respectively. The osteoblastic osteosarcoma held the worst rate of chemotherapy sensitivity (P < 0.05). The overall survival of non-osteoblastic osteosarcoma was shorter than those of partially osteoblastic and osteoblastic types (P < 0.05). Post-metastatic survival time of osteoblastic osteosarcoma was longer than that of non-osteoblastic osteosarcoma (P=0.078). Conclusion For conventional osteosarcoma, the osteogenesis level in soft tissue lumps is related to the surgical stage, chemotherapy sensitivity and prognosis of tumors, which may provide guidance for the individual decision regarding chemotherapy and surgery timing on patients.
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Congenital tuberculosis is a tuberculosis disease caused by the fetus infected with Mycobacterium tuberculosis in the womb or during delivery, which is a kind of special and rare tuberculosis in children.The clinical manifestation of congenital tuberculosis is lack of specificity, difficulty in early diagnosis, rapid progress, easy misdiagnosis and high mortality.At present, there are few studies on congenital tuberculosis.In this review, we will discuss the epidemiology and clinical features of congenital tuberculosis.Importantly, we will further introduce the rapid etiological detection and treatment to strengthen clinicians′ understanding of congenital tuberculosis.
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Objective To investigate the effect of dapagliflozin on metabolic markers, hepatic fat content, and autonomic nervous function in patients with type 2 diabetes mellitus (T2DM) and metabolic associated fatty liver disease (MAFLD). Methods A total of 90 patients with T2DM and MAFLD who were admitted to The Second Affiliated Hospital of Zhengzhou University from October 2019 to October 2020 were enrolled and randomly divided into control group and dapagliflozin group, with 45 patients in each group. All patients were given conventional treatment before enrollment; the patients in the control group were treated with the original hypoglycemic regimen, and those in the dapagliflozin group were given dapagliflozin in addition to the treatment in the control group. The treatment cycle was 24 weeks. General information was collected before and after treatment, and the two groups were compared in terms of the changes in body mass index (BMI), glycosylated hemoglobin (HbA1c), fasting blood glucose (FPG), blood lipids, serum uric acid (SUA), Homeostasis Model Assessment of Insulin Resistance (HOMA-IR), liver function, liver fat content, and heart rate variability after treatment. The paired t -test was used for comparison of normally distributed continuous data within each group, and the independent samples t -test was used for comparison between groups; the Wilcoxon rank-sum test was used for comparison of non-normally distributed continuous data within each group, and the Mann-Whitney U test was used for comparison between groups. The Chi-square test was used for comparison of categorical data between two groups. Results A total of 43 patients in the dapagliflozin group and 40 patients in the control group completed the study. After 24 weeks of treatment, the dapagliflozin group had significant reductions in BMI, HbA1c, FBG, triglyceride (TG), SUA, alanine aminotransferase (ALT), aspartate aminotransferase (AST), HOMA-IR, and liver fat content ( t =8.781, 8.765, 8.813, 3.485, 6.199, 5.694, 3.428, 6.492, and 4.925, all P < 0.05) and significant increases in high-density lipoprotein cholesterol, standard deviation of all normal R-R intervals (SDNN), standard deviation of average NN intervals (SDANN), root mean square of successive differences, percent of the number whose difference between adjacent NN interval are more than 50 ms (pNN50), high frequency (HF), and low frequency (LF) ( t =-2.055, -6.307, -7.696, -3.388, and -7.928, Z =-3.339 and -3.309, all P < 0.05), while the control group had significant reductions in HbA1c, FBG, and HOMA-IR ( t =9.220, 7.214, and 3.340, all P < 0.05). Compared with the control group after treatment, the dapagliflozin group had significantly lower levels of BMI, HbA1c, TG, SUA, HOMA-IR, ALT, AST, and liver fat content ( t =-4.055, -2.670, -2.056, -2.496, -3.976, -3.703, -2.123, and -5.184, all P < 0.05) and significantly higher levels of SDNN, SDANN, pNN50, LF, and HF ( t =4.136, 5.433, and 5.971, Z =-2.333 and -2.010, all P < 0.05). Conclusion For patients with T2DM and MAFLD, dapagliflozin can reduce BMI, HbA1c, TG, SUA, and liver fat content, improve insulin resistance and liver function, reduce the activity of sympathetic nerve, and regulate autonomic nerve function.
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Objective:To establish an evaluation index system for training effect of order-oriented clinical medical students in Xinjiang by employers, so as to lay a foundation for training effect evaluation.Methods:On the basis of questionnaires and interviews with the training requirements of employers, Delphi method was used to determine the index system and weight.Results:The training requirements of employing units for the ability of free and directional medical students in autonomous regions were in turn competent for work, knowledge and practical ability, and good moral quality. The cultivation requirements for students' personal qualities of free and directional medical students were good interpersonal communication and moral quality. After three rounds of Delphi expert consultation, the evaluation index system was established, and three dimensions (knowledge, professional ability, professional ethics literacy), nine secondary indicators and 33 tertiary indicators were screened out, and the weights were determined.Conclusion:The evaluation index of training effect of directional clinical medical students established by Delphi expert consultation method needs further validation. Through the follow-up empirical application in directional clinical students, the evaluation index system can be constantly improved, which can also provide reference for the establishment of evaluation index system for other positions.
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Objective:To evaluate the characteristics and risk factors for blood transfusion in very low birth weight infants(VLBWI).Methods:Clinical data of one hundred VLBWI, hospitalized from July, 2016 to June, 2019, were studied retrospectively.The infants were divided into two groups according to whether they received blood transfusion.The general information, incidence of diseases and treatment measures were compared between two groups.The risk factors influencing the blood transfusion were analyzed.Results:Of the one hundred VLBWI, sixty-nine cases needed blood transfusion.The first time of blood transfusion ranged from one to four weeks after birth, and average number of transfusions was 6 times.Maternal anemia during pregnancy, birth weight, gestational age, hemoglobin and hematocrit at birth, volume of blood taking within two weeks after birth, duration of hospitalization, duration of paraenteral nutrition, delivery method, need for intubation and neonatal respiratory distress syndrome, apnea, bronchopulmonary dysplasia, patent ductus arteriosus showed significant differences between the two groups( P<0.05). Logistic regression analysis revealed that lower gestation( OR=0.386, 95% CI 0.212-0.704, P=0.002), longer duration of hospital stay( OR=2.177, 95% CI 1.170-4.049, P=0.014), prolonged parenteral nutrition( OR=1.195, 95% CI 1.083-1.319, P<0.001), greater volume of blood taking within two weeks after birth ( OR=1.269, 95% CI 1.083-1.487, P=0.003)and cesarean delivery( OR=5.513, 95% CI 1.056-28.770, P=0.043) were associated with increasing risk of blood transfusion in VLBWI. Conclusion:The gestational age, length of hospital stay, blood intake within two weeks after birth, duration of paraenteral nutrition and delivery method all affected the risk of blood transfusion to varying degrees.
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Objective:To investigate the effects of intelligent hand hygiene monitoring system on hand washing compliance and the incidence of catheter-related bloodstream infections.Methods:A retrospective analysis was conducted on the hand hygiene compliance of medical staff and works at different seasons in 2018. The daily doses of hand sanitizer patients in each quarter of 2017 and 2018, the microbial contamination of the hands before the medical staff contacted the patients, the overall hospital infection rate and the incidence of catheter-related bloodstream infections were calculated and compared.Results:The hand-washing compliance rate of medical staff and workers were increased in 2018. Compared with daily doses of hand sanitizer patients in 2017 and 2018, there was significant difference ( F value was 4.99, P<0.05). In 2018, the qualified rate of microbial contamination in the hands of medical staff before contacting patients was higher than in 2017: 91.5%(43/47) vs. 51.1%(23/45), there was significant difference ( χ2 value was 92, P<0.05) . The rate of hospital infection and catheter-related bloodstream infections were 1.57%(30/1 907), 0.5%(6/1 158) in 2018 and 3.11%(57/1 843), 1.6%(17/1 095) in 2017, there was significant difference ( χ2 values were 9.551, 5.959, P<0.05). Conclusions:The intelligent control hand hygiene monitoring system can improve the hand-washing compliance of medical staff and workers, reduce microbial contamination in the hands of medical staff, thereby reducing the incidence of catheter-related bloodstream infections.
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Objective@#The aim of this study is to summarize the experience of the orthognathic surgical treatment forsecondary maxillary deformities following the cleft lip and palate repair.@*Methods@#Twenty-two patients with secondary maxillary deformities following the cleft lip and palate repairment(orthognathic approach), were retrospectively analyzed.All the cases were treated in the Hospital of Stomatology, China Medical University from January 2007 to December 2016. There were 9 males and 13 females, ranging from 18 to 24 years in age. Only 3 of those cases were not undergone preoperative and postoperative orthodontic treatments. The anteroposterior maxilla and mandible discrepancy was 6-11 mm preoperatively. The modified surgical procedures are as follows: One-stage alveolar bone graftand maxillary osteotomy were performed for unilateral cleft patients; Internal fixation with micro-plate at the alveolar cleft region was performed to stabilize the maxillary dental arch intraoperatively; Intermolar wire ligation and palatal arch were used to control the width of maxilla intraoperatively and 1 month after operation; 2-3 mm overcorrection for the Le Fort Ⅰ advancement was produced to reduce relapse in sagittal direction. Mandibular set back was performed using bilateral sagittal split osteotomy at the same time. Rigid internal fixation with titanium palates and screws was applied for all the cases. All patients had been followed up for 1 to 2 years postoperatively.@*Results@#Most of the patients had satisfactory facial proportion, and good and stable occlusion relationship, with only one patient developed severely uncontrollable relapse to class Ⅲ malocclusion, and 3 patients experienced relapse resulted in edge to edge incisor relationship.@*Conclusions@#Le Fort Ⅰ osteotomy combined with bilateral sagittal split osteotomy was effective to correct the secondary maxillary deformities following the cleft lip and palate repair. The treatment plan should be individualized, depending on the patients′ occlusion relationship, skeletal deformity, and facial appearance as well. It is necessary to modify the surgical techniques of Le Fort Ⅰ osteotomy for the cleft patients.
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Objective@#To explore the relationships among perceived stress, emotion regulation strategies, and abnormal eating behavior among medical students, in order to provide healthy eating behavior reference for medical students, especially under pressure.@*Methods@#Chinese Perceived Stress Questionnaire, Emotion Regulation Questionnaire, and Dutch Eating Behavior Questionnaire were administered among 777 students from three medical universities in Shanxi seleceted by a stratified random cluster sampling method.@*Results@#There were significant differences in unhealthy eating behavior by gender and major. Abnormal eating problem score of clinical medicine students was significantly higher than that of non-clinical medicine students (t=3.56,P<0.01); Scores of restrained eating behavior, emotional eating behavior, and exogenic eating behavior of clinical medicine students were all significantly higher than those of non-clinical medicine students (t=3.45, 3.04, 4.19, P<0.01). Abnormal eating behavior, and restrained eating behavior and exogenic eating behavior in female students were significantly higher than those of male students (t=2.28, 2.58, 2.46, P<0.05). The perceived stress significantly and positively correlated with the abnormal eating behavior (P<0.01); Cognitive reappraisal and expressive inhibition significantly and negatively correlated with abnormal eating behavior respectively (P<0.01); No significant association was found between expressive inhibition and abnormal eating behavior. Cognitive reappraisal mediated the association between abnormal eating behavior with perceived stress which accounted for 36.89%, mediating effect in boys was higher than that of girls. However, expressive inhibition showed no similar effect and gender difference.@*Conclusion@#Perceived stress can influence abnormal eating behavior of medical students through cognitive reappraisal directly or indirectly, while expressive inhibition shows no such mediating effect. For medical students under pressure, the skill of emotion regulation through cognitive reappraisal, emotion expression as well as appropriate coping style under pressure should be developed.
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On January 1st 2018, a male 44 years old diabetic patient with subcutaneous soft tissue infection in right thigh was admitted to our hospital. The patient repeatedly used the same needle to inject insulin subcutaneously in the unsterilized right thigh, and his blood glucose was badly controlled in the long term. Severe subcutaneous soft tissue infection of the right thigh occurred after his fatigue, accompanied with ketoacidosis. Then he received conservative treatment in the local hospital for one month, but the infection persisted. After being transferred to our hospital, we highly suspected the diagnosis of necrotizing fasciitis according to previous test indicators and local B-ultrasound results, but suggestion of aggressive surgery was refused. So we treated him with conservative therapies using sensitive antibiotics and supportive remedies. The patient was basically healed after treatment of 1 month and he was recovered well during the follow-up 2 months after discharged from our hospital. This case emphasizes the importance of standard injection of insulin and early diagnosis of severe subcutaneous soft tissue infection.
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Objective To compare the difference in risks of obstetric complications of singleton pregnancy between women with hyperandrogenic polycystic ovary syndrome (PCOS) and women with normoandrogenic PCOS. Methods Prospective cohort study. This study was a secondary analysis of data collected during a multicenter randomized controlled clinical trial. Women who got clinical singleton pregnancy were grouped according to whether they were diagnosed with hyperandrogenism at baseline. There were 118 women with hyperandrogenism and 366 women without hyperandrogenism. The incidences of obstetric complications and birth weight were compared between the two groups. Results Women with hyperandrogenic PCOS had a significantly higher risk of preterm delivery than women with normoandrogenic PCOS [12.7％ (15/118) versus 3.6％ (13/366); OR=3.94, 95％CI: 1.82-8.56]. After adjustment of age, duration of infertility, body mass index, and fresh or frozen embryo transfer group, hyperandrogenism was still associated with an increased risk of preterm delivery (OR=3.67, 95％CI: 1.67-8.07). Compared with women with normoandrogenic PCOS, women with hyperandrogenic PCOS had similar risks of pregnancy loss, gestational diabetes mellitus, pre-eclampsia, placenta previa, and postpartum hemorrhage (all P>0.05). Birth weight as well as the risks of being small for gestational age and large for gestational age were also comparable between the two groups (all P>0.05). Conclusion In women with PCOS and singleton pregnancy, those with preconceptional hyperandrogenism have a higher risk of preterm delivery than those without hyperandrogenism.
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Objective To compare the rates and pathological features of diabetic keratopathy in mice induced by single high dose or multiple low dose streptozotocin (STZ) injections.Methods Eighty male C57BL/6 mice (6-8 weeks old) were randomly divided into 4 groups with each group contain 20 mice:normal control group,multiple low dose 1 month group and multiple low dose 3 months group (injected with 60 mg/kg STZ for 5 consecutive times),single high dose 1 month group (injected with 150 mg/kg STZ).The survival rate,model success rate,body weight,glycosylated hemoglobin (HbA1c) content were compared among different modeling group.The percentages of residual epithelial defect area were examined by fluorescein sodium staining after removal of central corneal epithelium.The expression of p-Akt,Sirt1 and Ki67 were evaluated by immunofluorescent staining.The corneal sensitivity were compared among different groups before corneal epithelial curettage,3,7,10 and 14 days after corneal epithelial curettage.The corneal subbasal nerve density at 14 days after corneal epithelial curettage were compared among different groups.This study complied with the declaration of ARVO Results The success rate of diabetic modeling in multiple low dose 1 month group,multiple low dose 3 months group and single high dose 1 month group was 90％,80％ and 70％,respectively.The HbA1c levels in the diabetic modeling groups were significantly higher than that in the normal control group (all at P＜0.05).The percentage of residual epithelial defect area 24 and 48 hours after corneal epithelial curettage in the multiple low dose 3 months group and single high dosc 1 month group were significantly higher than those in the normal control group (all at P＜0.05).The fluorescence intensity of p-Akt,Sirt1 and Ki67 in the multiple low dose 3 months group and single high dose 1 month group were stronger than those in the normal control group.There were no significant differences on corneal sensitivity and corneal nerve density between normal control and multiple low dose 3 months group before and 14 days after the corneal epithelial removal (all at P＞0.05).However,the corneal sensitivity and corneal nerve density were dramatically decreased in the multiple low dose 3 months group and single high dose 1 month group before and 14 days after the corneal epithelial removal,and there were significant differences compared with normal control group (all at P＜0.05).Conclusions The injection of 60 mg/kg STZ can not induce the features of diabetic keratopathy in mice within 1 month.However,the mice of both 1 month after 150 mg/kg STZ injection and 3 months after 60 mg/kg STZ injection appear the typical epithelial and nerve features of diabetic keratopathy,therefore can be the ideal animal models for research.
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Objective To investigate the characteristics of cognitive impairment and its influential factors in young and middle-aged hospitalized patients with T2DM.Methods Totally 140 young and middle-aged T2DM patients were recruited in 4 hospitals using convenience sampling method and were evaluated by Montreal Cognitive Assessment Scale (MoCA).Results The prevalence of cognitive impairment in 140 young and middle-aged T2DM patients in this study was 37.9％.The delayed memory (85.0％) was most common,followed by language(73.6％),and impaired visuospatial and executive function(50.7％).Attention,abstraction,and orientation were rarely affected,and naming was not impaired.Logistic regression showed that older individuals,women,poor blood glucose control could be important independent risk factors for cognitive impairment in young and middle-aged T2DM patients.Conclusion The prevalence of cognitive impairment in young and middle-aged T2DM patients was relatively high,and the delayed recall was mostly common.The older individuals,women,poor blood glucose control are associated with cognitive impairment.
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Objective To investigate the relationship between fibrosis and M2 macrophages in endometriosis. Methods BALB/c mice model of endometriosis was established by intraperitoneal injection. The growth of ectopic lesions in mice was observed on the 7th,14th and 21th day after modeling. Masson staining was used to observe the degree of fibrosis and immunohistochemical method to detect the expression of CD206 and CD68 of mice. Image-Pro-Plus 6.0 was used for semi quantitative analysis of staining and the correlation between the degree of fibrosis and the expression of M2 macrophages was explored. Results The success rate of the establishment of endometriosis model by intraperitoneal injection was 100%. There was a positive correlation between fibrosis and the expression of M2 macrophages in endometriosis mice model. Conclusions The mice model of endometriosis can be established successfully by intraperitoneal injection and M2macrophages may promote fibrosis in endometriosis.
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Objective To investigate the prevalence of and influencing factors for atopic dermatitis (AD)in children aged 1-7 years in Shenzhen city,and to analyze difference in diagnostic results between two diagnostic criteria.Methods From December 1st 2013 to March 1st 2014,a questionnaire survey and physical examination were conducted to investigate the prevalence of AD in children aged 1-7 years in Shenzhen city.Results A total of 1 504 children were enrolled into this study,including 716 males and 788 females.Based on the clinical diagnosis by experienced dermatologists,the prevalence of AD was 11.84％ (17811 504) in total,11.73％ (84/716) and 11.93％ (94/788) in males and females,respectively,and there was no significant difference in the prevalence of AD between males and females (x2 =0.01,P ＞0.05).Based on the Williams' diagnostic criteria,the prevalence of AD was 3.92％ (59/1 504) in total,and 4.05％ (29/716) and 3.81％ (30/788) in males and females,respectively.Premature birth was a risk factor for the occurrence of AD (x2 =5.43,P ＜ 0.05).Conclusions The prevalence of AD is evidently increased among children aged 1-7 years in Shenzhen city,and premature birth is a risk factor for AD.Missed diagnosis will be reduced based on clinical diagnosis by experienced dermatologists.
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Objective To determine the effect of microRNA-146a (miR-146a) on the life cycle of hepatitis B virus (HBV) and investigate the underlying mechanisms.Methods The miRNA expression profiles were compared by miRNA array between HepG2 and HepG2.2.15 cells.Then miR-146a was chosen as objective,and its expression level was further confirmed by RT-PCR.After miR-146a mimic and inhibitor were transfected into HepG2.2.15 cells respectively,the quantification of HBV replication was determined by RT-PCR,and the levels of HBsAg and HBeAg in the supernatant were measured by ELISA,and the expression of HS3ST3B1 at mRNA and protein levels were tested by RT-PCR and Western blotting.Dualluciferase reporter assay was used to detect the interaction between miR-146a and potential target HS3ST3B1.Results The expression levels of totally 72 miRNAs were changed in HepG2.2.15 cells,with 27 upregulated and 45 down-regulated.RT-PCR showed the expression level of miR-146a was significantly higher in HepG2.2.15 cells than HepG2 cells (1.55-± 0.13 vs 1.00 ± 0.01,P ＜ 0.05).Transfection of miR-146a mimic into HepG2.2.15 cells resulted in significantly increased HBV replication and levels of HBsAg and HBeAg (P ＜ 0.05),while the transfection of its inhibited caused opposite results (P ＜ 0.05).Bioinformatic analysis showed that HS3ST3B1 was a potential target of miR-146a.The reporter luciferase reporter system indicated that the reported fluorescence intensity of HS3ST3B1 wild type vector was significantly lower than that of the control group (P ＜ 0.05),but showed no significant difference between HS3ST3B1 mutant vector and control group (P ＞0.05).The mRNA level of HS3ST3B1 was not significantly changed in HepG2.2.15 cells transfected with miR-146a mimic (P ＞ 0.05),but its protein level was significantly decreased (P ＜ 0.05).Conclusions miR-146a affects the life cycle of HBV,which may be through suppressing the translation of HBV inhibitory factor HS3ST3B1 3'UTR.
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Background Interleukin-6 (IL-6) is a pleiotropic cytokine involving in inflammation and wound healing.Previous report found that IL-6 increases phosphorylated STAT3 (p-STAT3) level and promotes corneal epithelial wound healing by stimulating migration.However,the essential role of IL-6 in corneal epithelial wound healing and the expression changes in diabetic mellitus remains unknown.Objective This study was to explore the roles of IL-6 in corneal epithelial proliferation and wound healing in both normal and diabetic mice.Methods Fifty-two normal C57BL/6 mice were randomized into normal control group (32 mice) and diabetic group (20 mice).Type 1 diabetic mellitus was induced by intraperitoneal injections of 50 mg/kg streptozotocin once per day for consecutive 5 days in the mice of the diabetic group.Whole corneal epithelium was scraped in all mice,and the corneal epithelial defect area was examined by fluorescein staining in 24,48 and 72 hours after corneal epithelium removal.Recombinant mouse IL-6 or anti-IL-6 blocking antibody of 5 μl were subconjunctivally injected according to the grouping and contrasted with PBS injection group or isotype control antibody group,respectively.TKE2 cells,a mouse corneal epithelial stem/progenitor cell line,were trypsinized and incubated in the KSFM with different concentrations of IL-6 or without IL-6,and colony formation efficency (CFE) was examined by crystal violet staining.The expressions of △NP63 and Ki67,specific makers of stem cells,were detected by immunofluorescine technology.The expressions of △NP63,Ki67 and p-STAT3 proteins were assayed in the cells by Western blot,respectively.The expression of IL-6 mRNA and protein in the regenerated corneal epithelium was detected by real time quantitative PCR and ELISA.The use and care of the mice complied with the Statement of Association for Research in Vision and Ophthalmology.Results The percentage of residual corneal epithelium defect area with initial detect area was gradually shrinked over time after PBS and IL-6 injection in both normal control mice and diabetic mice,and the percentage of residual corneal epithelium defect area was significantly reduced in the IL-6 injected group compared with the PBS injected group (normal control group:Fgroup =19.982,P ＜ 0.01;Ftime =589.350,P ＜ 0.01;Diabetic group:Fgroup =25.411,P＜0.01;Ftime =334.807,P＜0.01).The CFE was (13.23± 1.12)％,(15.87± 1.30)％,(21.69±1.62)％,(25.33±1.28)％ and (18.67±1.54)％ in the blank control group and 10,20,50,100 ng/ml IL-6-treated groups,respectively,showing a gradual increase of CFE dependent upon IL-6 concetrations (F =35.547,P＜0.01).The expressions of △NP63,Ki67,p-STAT3 proteins in the cells were gradually increased over time after 50 ng/ml IL-6 treated for 5,10,15,30 and 60 minutes,and the relative expression level of the cytokines was significnatly higher in the IL-6 cultured groups than that without IL-6 culture group (all at P＜0.05).The relative expression of IL-6 mRNA in the regenerated corneal epithelilum was 0.45±0.21 and 1.00±0.16 in the diabetic group and normal control group,respectively,and compared with the normal control group,the expression of IL-6 mRNA reduced by 56％ (t=3.42,P=0.03).The content of IL-6 protein in regenerated corneal epithelium of the diabetic group was (257±12) ng/μl,which was significantly lower than (323 ± 17) ng/μl of the normal control group (t =5.60,P＜0.01).Conclusions IL-6 promotes the proliferation and regeneration of corneal limbal stem cells to repair defected corneal epithelium by activating STAT3 signaling pathway in both normal and diabetic mice,while the blocking of endogenous IL-6 impairs the corneal epithelial cell activation and wound healing.