BACKGROUND:Current research on mesenchymal stem cels (MSCs) is mostly focused on its immune regulatory function, while little is reported on the antioxidant capacity of the cels and culture supernatant.OBJECTIVE: To investigate the anti-oxidative capacity of the supernatant harvested from human fetal placenta MSCs (fPMSCs) under a condition of serum free culture. METHODS:fPMSCs were cultured with serum free media, and the supernatants of cels at passages 2-6 were colected at 48 hours after culture. Vitamin C was added into the culture medium, as a positive control, and its concentration was 100 μmol/L. The total antioxidant capacity, scavenging capacity of free radicals and antioxidant enzymatic activities of supernatants were measured. RESULTS AND CONCLUSION: By comparing anti-oxidative activities of vitamin C and na?ve culture medium, supernatants colected from fPMSCs cultures exhibited obvious antioxidant capacities at different extents between passages of cel cultures. The total antioxidant capacity of the culture supernatant was comparable to 40-80 μmol/L vitamin C. In addition, al supernatants derived from cels with different passages displayed capacities to scavenge free radicals, including 2,2-diphenyl-1-picrylhydrazyl radical (DPPH?), hydroxyl radical (?OH), superoxide anion radical (O2-). Even more, activities of antioxidant enzymes, including superoxide dismutase and glutathione peroxidase, were also detected in supernatants colected from different passages of fPMSCs. Under the serum-free condition, the culture supernatants of fPMSCs have antioxidant capacities at certain extent. However, the antioxidant components and underlying mechanisms need to be further studied.

Background:Accumulating evidence links colorectal cancer (CRC) with the gut microbiota.Fusobacterium nucleatum (F.nucleatum) has been revealed to be involved in the development of CRC, however, the mechanism of F.nucleatum in mediating colorectal tumorigenesis is still poorly understood.Aims:To investigate the effect and potential mechanism of F.nucleatum on CRC.Methods:Wild type C57BL/6 mice and APC(Min/+) mice characterized by multiple intestinal neoplasia were used in this animal study.After administered with F.nucleatum intragastrically and/or 1,2-dimethylhydrazine (DMH, a carcinogen) subcutaneously, the aberrant crypt foci (ACF) and colonic tumor were counted at 8th and 20th week, respectively.Structural alteration of intestinal microbiota and mucosal immune factors were detected in wild type C57BL/6 mice receiving different interventions by using Roche 454 GS FLX pyrosequencing and Bio-Plex ProTM cytokine assay, respectively.Results:In DMH-treated wild type C57BL/6 mice or APC(Min/+) mice, number of ACF and colonic tumor in those administered with F.nucleatum were significantly higher than those without (P<0.05).F.nucleatum colonization significantly altered the lumen microbial structure, with decreased Cyanobacterium and increased Tenericutes and Verrucomicrobia (P all <0.05).Furthermore, F.nucleatum up-regulated expressions of tumor-related immune factors in colonic mucosa, such as IL-21, IL-22, IL-31 and CD40L (P<0.05).Conclusions:F.nucleatum colonization in intestine may prompt colonic tumorigenesis in mice via inducing intestinal dysbiosis and modulating tumor-related immune factors expression.

Objective To observe the therapeutic effect of catgut-embedding (CE) therapy based on respiration-induced reinforcing and reducing and electro-acupuncture (EA) therapy in treating simple obesity with spleen deficiency and dampness retention. Methods Sixty simlpe obesity patients with spleen deficiency and dampness retention were randomized into CE group and EA group, 30 cases in each group. The acupoints selected for the two groups were the same, and the points were Zhongwan, Shuifen, Qihai, Guanyuan, Tianshu, Liangmen, Daheng, Fujie, Quchi, Xuehai, Yinlingquan, Fenglong, and Ashi. CE group was given CE therapy with the needling for CE therapy referred to the respiration-induced reinforcing and reducing method, and EA group was given EA therapy for 2 continuous treatment courses, 4 weeks constituting one course. Body mass and body mass index (BMI) of the two groups before and after treatment were observed, and the clinical efficacy was also evaluated after treatment. Results (1) After treatment for 2 courses, body mass and BMI of the two groups were obviously decreased(P<0.05 compared with those before treatment), but the differences between the two groups were insignificant (P > 0.05). (2) The total effective rate of CE group was 90.0% and that of EA group was 86.7%, and the difference between the two groups was insignificant (P > 0.05). Conclusion The therapeutic effect of CE therapy based on respiration-induced reinforcing and reducing in treating simple obesity with spleen deficiency and dampness retention is similar to that of EA therapy, and the patients can choose anyone of them for loosing body weight according to the preference.

Objective: To explore the correction factors of lung cancer caused by radon exposure in a uranium mine, and estimate the excess relative risk (ERR) coefficient of lung cancer caused by radon in the uranium miners. Methods: Male miners who worked in a uranium mine more than one year in Hunan Province from 1958 to 2018 were selected. This study preliminarily estimated the ERR coefficient of lung cancer caused by radon in the miners with different corrections using the Possion regression model. Results: This study cohort included 4 851 uranium miners, with 187 miners died with lung cancer from 1958 to 2018, and cumulative follow-up of 207 251 person-year. The ERR coefficient of lung cancer caused by radon without correction factors was estimated to be 0.21%/WLM (95%CI: 0.04%/WLM-0.27%/WLM). In the final model, the exponential correction factors of radon-induced lung cancer were time since exposure and exposure rate. In this model, if time since exposure was 45 years and the average exposure rate was 0.14 WL, the estimated ERR coefficient was 1.73%/WLM (95%CI: 0.36%/WLM-3.11%/WLM). The ERR decreases by about 60.00% for every 10 years since exposure, and increases by about 30.00% for every one WL increase exposure rate. Conclusion: The correction factors of lung cancer caused by radon in uranium miners in this mine were the time since exposure and exposure rate. It was preliminarily estimated that the ERR coefficient of lung cancer caused by radon in the occupational radon exposed population in this uranium mine was 1.73%/WLM (95%CI: 0.36%/WLM-3.11%/WLM).

With the increasing incidence of hematologic malignancies, exploring its pathogenesis and new treatment strategies has become new research directions. The development of high-throughput sequencing technology has led to the recognition of long non-coding RNA, which plays an important role in the development of life and the regulation of diseases. As the first reported long non-coding RNA, H19 acts as an oncogene to take part in various pathological processes in the growth and metastasis of tumors. However, the multiple roles of H19 in hematologic malignancies are lack of systematic summary. This article reviews the role of H19 in carcinogenesis, progression and drug resistance mechanism of hematologic malignancies, in order to provide guidance for further research.

Objective:To explore the correlation between abdominal aortic calcification and serum cell division cycle 42 (CDC-42) in maintenance hemodialysis (MHD) patients, and to explore the influencing factors of them.Methods:A cross-sectional study was conducted in the Blood Purification Center of Qingdao Municipal Hospital,112 patients who underwent MHD for more than 6 months from October 2019 to March 2021 were selected. The abdominal aortic calcification score (ACCs) was calculated by reference to the abdominal lateral X flat tablets. According to AACS, 50 cases were divided into no and mild calcification group (0≤AACS<5 points) and 62 cases were divided into moderate and severe calcification group (AACS≥5 points). The level of serum CDC-42 was detected by enzyme linked immunosorbent assay (ELISA). Taking the median serum CDC-42 level as the boundary, 56 cases were divided into low CDC-42 group and high CDC-42 group. Spearman correlation analysis was used to analyze the correlation between indicators. The risk factors of elevated CDC-42 and abdominal aortic calcification in MHD patients were explored by multivariate logistic regression analysis, and the variables were included by entry method.Results:In 112 patients, 91 cases (81.25%, 91/112) had abdominal aortic calcification, and the median serum CDC-42 level was 466.56 (335.56,623.57) ng/L. CDC-42, AACs, age, dialysis age, diabetic nephropathy, glycosylated hemoglobin, alkaline phosphatase, parathormone and calcium in the no and mild calcification groups were 347.77 (291.20, 419.53) ng/L, 1.00 (0.00, 3.00) points, (57.18±6.25) years, 31.50 (15.00, 49.25) months, 34.00%(17/50), (6.63±0.97)%, 116.22 (87.32, 152.13) U/L, 258.57 (143.40, 433.31) ng/L, (2.18±0.26) mmol/L, and in the moderate to severe calcification group were 602.69 (489.61, 762.73) ng/L, 10.00 (7.00, 16.25) points, (60.81±7.12) years, 49.00 (18.00, 67.00) months, 53.23%(33/62), (7.07±1.20)%, 144.34 (99.71, 201.76) U/L, 336.57 (230.63, 506.00) ng/L,(2.28±0.26) mmol/L, with statistically significant differences between the two groups(The statistical values were 6.99, 9.11, 2.83, 2.45, 4.14, 2.08, 2.04, 2.16 and 1.99, respectively, all P<0.05). CDC-42, AACs, glycosylated hemoglobin and parathormone in the low CDC-42 group were 336.50 (295.10, 395.25) ng/L, 2.00 (0.00, 4.00) points, (6.62±1.06) %, 250.60 (140.20, 462.02) ng/L,and in the high CDC-42 group were 622.92 (558.11, 836.65) ng/L, 10.00 (6.25, 15.75) points, (7.13±1.13) %, 347.21 (240.40,501.20) ng/L, with statistically significant differences between the two groups (The statistical values are 6.51, 5.21, 2.43 and 2.54, respectively,all P<0.05). Abdominal aortic calcification has positive correlations with CDC-42 ( r s=0.704, P<0.001), age ( r s=0.308, P=0.001), dialysis years ( r s=0.198, P=0.036), glycosylated hemoglobin ( r s=0.358, P<0.001), alkaline phosphatase ( r s=0.187, P=0.048), parathormone ( r s=0.437, P<0.001), serum calciu m( r s=0.323, P=0.001) and serum phospho-rus ( r s=0.251, P=0.007), and negative correlation with serum albumin( r s=-0.276, P=0.003). This study has confirmed that high serum CDC-42 ( OR=1.010, 95%CI:1.004-1.016, P=0.001) and senior dialysis age ( OR=1.033, 95%CI:1.006-1.061, P=0.018) were independent risk factors for moderate to severe abdominal aortic calcification.Serum CDC-42 levels has positive correlation with AACs ( r s=0.704, P<0.001), age ( r s=0.240, P=0.011), dialysis age ( r s=0.191, P=0.044), glycosylated hemoglobin ( r s=0.350, P<0.001), parathormone ( r s=0.380, P<0.001) and serum calcium ( r s=0.235, P=0.013). This study learned that,high AACs ( OR=1.185, 95%CI:1.037-1.354, P=0.013) and high parathormone ( OR=1.005, 95%CI:1.001-1.009, P=0.009) were independent risk factors for high CDC-42. The area under the receiver operating characteristic curve (ROC-AUC) of serum CDC-42 in predicting moderate and severe abdominal aortic calcification in MHD patients was 0.885. When the cut-off point was 466.56 ng/L, the predictive sensitivity and specificity were 79% and 86% respectively. Conclusion:The degree of abdominal aortic calcification in MHD patients was positively correlated with the level of serum CDC-42. High serum CDC-42 and high dialysis age were independent risk factors for abdominal aortic calcification in MHD patients. High AACS and high parathyroid hormone were independent risk factors for the increase of serum CDC-42 in MHD patients .

Objective:To explore the responsibilities of respiratory nurses in the management of chronic obstructive pulmonary disease (COPD) patient and the difficulties in disease management, so as to provide reference basis for formulating COPD management training strategies for respiratory nurses.Methods:Using phenomenological methodology, 14 nurses from the Department of Respiratory and Critical Care Medicine in the General Hospital of Ningxia Medical University and the First People′s Hospital of Yinchuan were interviewed in a personal semi-structured way from May to August 2021, and the data were sorted and analyzed according to Colaizzi 7-step analysis method.Results:Nurses′understanding of the responsibilities of COPD patient management could be summarized into five themes: dynamic monitoring and management of patients′ health, nursing decision-making of sudden changes in patients′ condition, implementation of patients′ out of hospital follow-up, promotion of improvement of patients′ self-management behavior, and cooperation among multidisciplinary team members. The difficult experience of nurses in the management of COPD patients abstracted five themes: lack of professional knowledge of COPD management, lack of clinical nursing decision-making authority, lack of human and financial support for follow-up, lack of communication skills with patients, and lack of multidisciplinary team formation in the hospital.Conclusions:Respiratory nurses have a clear understanding of the responsibilities of COPD patient management, but there are multiple difficulties in performing their responsibilities. We should pay attention to the responsibility positioning and difficulty support of nurses′ COPD management, and formulate targeted training strategies to promote the improvement of COPD nursing quality.

Objective To determine the utility of computed tomographic (CT) enteroclysis for characterization of the status of the anastomotic site in patients with Crohn's disease (CD) who have previously undergone ileocolic resection. Methods Totally 31 CD patients who had previously undergone ileocolic resection were enrolled in the study. After having been orally administered with isosmotic mannitol, the patients received CT scanning including plain scan, arterial phase scan, and portal venous phase scan. The abnormal CT findings were analyzed based on portal venous phase images. CT enteroclysis findings in 31 patients were evaluated by two radiologists in consensus. Endoscopic findings, histopathologic findings, and/or the Crohn's disease activity index (CDAI) were used as the reference criteria. Associations between CT enteroclysis findings and anastomotic site status were assessed. The sensitivity, specificity, accuracy, positive predictive value, and negative predictive value of CT enteroclysis for the diagnosis of normal anastomosis versus anastomotic recurrence were estimated. Results Twenty-six cases and 5 cases were diagnosed as disease recurrence and normal anastomosis, respectively. In the disease recurrence group, 11 patients (42%) had lymphadenopathy (diameter＞ 1 cm) and 8 patients (31%) had peri-anastomotic fistulas, which were absent in normal anastomosis group, but the difference was not significant Anastomotic wall thickening more than 6 mm, marked mucosal enhancement, stratification, and peri-anastomotic stranding were found in 16 (62%), 19 (73%), 14 (54%), and 20 (77%) cases, respectively, in disease recurrence group, which were absent in normal anastomosis group ( all P ＜ 0.05 ). When the diagnosis of anastomotic recurrence was based on more than two of the following six variables, including lymphadenopathy, peri-anastomotic fistulas, anastomotic wall thickening more than 6 mm, marked mucosal enhancement, stratification, and peri-anastomotic stranding, its sensitivity, specificity, postive predictive value, negative predictive value, and accuracy yielded 88%, 100%, 100%, 63%, and 90%, respectively. The diagnostic accuracy of anostomotic stenosis with CT was only 53%. Conclusion CT enteroclysis yields objective and relatively specific morphologic criteria that help differentiate between recurrent disease and normal at the anastomotic site after ileocolic resection for CD.

Objective To compare the accuracy of bedside lung ultrasound in emergency(BLUE)and combined cardiac-lung and additional ultrasound(CLAUS)for diagnosing the causes of acute dyspnea.Methods Totally 1 016 patients with acute dyspnea were retrospectively enrolled and divided into cardiogenic pulmonary edema group(n=268),pneumonia group(n=574),pneumothorax group(n=33),pulmonary embolism group(n=67)and CAD(chronic obstructive pulmonary disease/asthma/diaphragmatic dysfunction)group(n=74)according to the causes of acute dyspnea.The findings of CLAUS protocol were compared among groups,and the accuracy of BLUE and CLAUS protocol for diagnosing the causes of acute dyspnea were also compared.Results CLAUS showed that B-B and B-C were the most common modes in cardiogenic pulmonary edema group,while A-B/A-C/B-A/B-B/B-C/C-C modes were common in pneumonia group,and A-A mode was the most common in pneumothorax group,pulmonary embolism group and CAD group.Significant differences of the manifestations of pulmonary ultrasound,pleural feature of anterior chest wall,left/right cardiac insufficiency and abnormal inferior vena cava diameter were found among groups(all P＜0.05).The accuracy of BLUE and CLAUS protocol for diagnosing the causes of acute dyspnea was 86.91%(883/1 016)and 94.49%(960/1 016),respectively,the latter was higher than the former(χ2=34.587,P＜0.05).Conclusion CLAUS protocol could be used to effectively diagnose the causes of acute dyspnea,with higher accuracy than BLUE protocol.

Objective To establish a method for uranium aerosol sample collection, dry ashing treatment, and laboratory laser-fluorescence measurement in the workplace of uranium processing and fuel fabrication facilities. Methods Through optimization experiments, the effects of sampling flow, sample pH value, and test temperature on uranium aerosol concentration results were studied, and the detection limit, precision, and recovery rate of the method were tested. Results Under the optimal test conditions, the detection limit of the method was 0.025 ng/mL; the minimum detectable concentration of 1 m³ of aerosol samples was 1.25 × 10⁻³ μg/m³; the relative standard deviation (RSD) of the measurement results was less than 5%; the recovery rate was between 96% and 104%. Conclusion The detection limit, precision, and accuracy of the method meet the testing requirements for uranium aerosol samples in the workplace of uranium processing and fuel fabrication facilities.