Objective:To summarize and analyze the results of the individual dose intercomparison in which province-level health institutions participating, and explore the role of ability intercomparison in improving the detection capabilities of province-level health institutions.Methods:From 2009 to 2022, the results obtained by the province-level CDCs and occupational prevention and control institutions in the individual dose intercomparison countrywide for time periods of 2009—2020 and 2021—2022 were summarized. The intercomparison results were analyzed and compared for three regions of east, central and west China divided according to the method from China Health Statistics Yearbook 2022.Results:A total of 24 province-level CDCs and 14 occupational prevention and control institutions countrywide participated in the ability intercomparison from 2009—2022 for 13 times. Number of participating institutions increased from 26 in 2009 to 37 in 2022. The qualified rates of the intercomparison results among the province-level health institutions in the three regions were maintained at higher than 85% for 37 times and 100% for 28 times. The pass rate and excellent rate of the three regions were higher than the overall level at whole country level (2009-2020) and national level (2021-2022) in the same period for 9 and 5 times, respectively. The excellent rate of province-level health institutions in central region were higher than that of the other two regions in 9 intercomparisons.Conclusions:With the improvement of the intercomparison standard, the province-level health institutions in various regions have maintained a relatively stable and high detection capability. The ability intercomparison effectively improve the detection ability and the quality control of the province-level health organizations. Many province-level agencies have listed the ability intercomparison as the regular work.

Objective: To improve radiation testing institutions’ ability and levels of personal dose monitoring for external exposure and standardize monitoring work. Methods: According to Testing Criteria of Personnel Dosimetry Performance for External Exposure (GBZ 207—2016), the intercomparison programme was made, the 2021 class-based personal dose monitoring intercomparison were organized by the National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention and provincial monitoring institutions. Results: A total of 150 institutions participated in the 2021 national intercomparison of personal dose monitoring capability. Of them, 143 (95.3%) passed the assessment, including 51 excellent institutions (excellent rate, 34.0%), and 7 (4.7%) failed to pass the assessments. Conclusion The 2021 national personal dosimetry performance intercomparison showed great improvements in the pass rate and excellent rate compared with previous national assessments. However, still seven institutions failed to pass this assessment, including four institu- tions with class A qualifications. The testing institutions need to find out the reasons to increase their testing ability. This class-based intercomparison improved the point-to-plane relationship between the organizing and testing institutions, help- ing the organizing institution focus on improving the testing ability of provincial testing institutions and class A radiation health service institutions.

Objective To analyze the frequency of interleukin (IL)-22+CD161+CD4+ T cells in the peripheral blood mononuclear cells (PBMCs) in rheumatoid arthritis (RA) patients compared with healthy control subjects and investigate the relationship of IL-22+CD4+CD161+ T lymphocyte frequency changes with RA disease activity.In addition to explore the pathogenesis of RA,and to look for new treatment targets for RA.Methods Twenty-one RA cases were included in the Department of Rheumatology of Tangshan Gongren Hospital from 2017 to 2018.Fourteen patients were female and 7 were male with the age ranged from 36 to 74 years old.The average age of this group of patients was (55±10) years,the average disease course was (60±50) months.All patients fulfilled the classification criteria of American College of Rheumatology [American College of Rheumatology (ACR)].Twenty-one subjects were enrolled as the control group,all of them came to Tangshan Gongren Hospital for regular health check-up.Fifteen subjects in the control group were female and 6 were male.Their age ranged between 40-78 years old with the average age of (55±9) years.IL-22+CD4+CD161+ T cells in PBMCs were detected by flow cytometry.The frequency variation of different CD4+CD161 + T was compared between case and control groups.The correlation was studied between the frequency and RA disease activity score (DAS28),tender joints number,swollen joints number,red blood cell sedimentation rate,high sensitive C reactive protein and white blood cell counts,red blood cell counts,platelet counts,IgG,IgA,IgM,complement C3 level,complement C4 level.T-test or Mann-Whitney U test were used for single-factor analysis,Pearson's test was used for correlation analysis.Results The percentage of RA group secreted CD4+ T cells (0.33± 0.20)％ of INF-γand IL-22,CD4+ T cells (0.51±0.29)％ of IL-22,and CD4+CD161+ T cells of IL-22 simultaneously.The number (0.55 ±0.28)％ was.significantly higher than that of the healtby control group [(0.22±0.14)％,(0.25±0.18)％,(0.36±0.24)％],and the differences were statistically significant [P=0.002,P=-0.0.45,P=0.026].Conclusion The percentage of IL-22+CD4+CD161+ T lymphocytes in the peripheral blood monocytes in RA patients is significantly higher than that in the healthy controls.The results of this study suggest that IL-22+CD4+CD161+ T lymphocytes in RA patients maybe related to RA disease activity and joint lesions.

Objective To investigate the association between polymorphisms in ADCY3,C10orf55,IL18RAP,CARD9,NFIL3 and susceptibility for Crohn's disease in Chinese population. Methods A total of 192 patients with Crohn's disease and 192 healthy controls were enrolled. Polymorphisms of those genes was detected by Sequenom iPLEXTM Mass Assay platform. The relationship between gene polymorphisms and Crohn's disease susceptibility was analyzed. Results A polymorphism within ADCY3, rs6545800,was susceptibility loci for Crohn's disease. Compared with the TT genotype,CC + CT carriers were less likely to develop Crohn's disease (P = 0. 004,OR = 0. 45,95％ CI: 0. 26-0. 78) . There was a weak correlation between rs4743820 within the NFIL3 gene and the susceptibility to Crohn's disease. Compared with TT carriers,CC + CT carriers had a lower probability of experience Crohn's disease (P = 0. 056, OR = 0. 64, 95％ CI:0. 40-1. 02). In addition,we also found that CC + CT of rs4743820 carriers had a lower incidence of upper gastrointestinal lesions than TT carriers (P = 0. 017,OR = 0. 26,95％ CI: 0. 08-0. 83). Conclusion The polymorphisms in ADCY3 and NFIL3 gene are associated with susceptibility to Crohn's disease in Chinese population.

BACKGROUND: Cell-free stem cell therapy has been an issue of concern, but there is no conclusion on how to extract high-quality exosomes. OBJECTIVE: To extract exosomes from human umbilical cord mesenchymal stem cells by using three different methods, and then to screen the optimal method. METHODS: Exosomes were extracted from human umbilical cord mesenchymal stem cells by using the Total Exosome Isolation test kit, Exo Quick test kit and differential ultracentrifugation method, respectively. Then, transmission electron microscopy was used for morphological observations, BCA was utilized to quantify the protein, and western blot assay was applied to detect surface markers CD9, CD81 and CD63. RESULTS AND CONCLUSION: Extraction of exosomes was completed by all the three methods, and round or oval membranous vesicles were observed under the transmission electron microscope. The protein content and purity of exosomes was highest in the differential ultracentrifugation group, followed by the Exobiology Quick kit group, and lowest in the Total Exosome Isolation kit group, and there were significant differences among the three groups (P < 0.05). Under the same protein concentration, surface specific markers, CD81, CD63 and CD9, were expressed highest in the differential ultracentrifugation group, followed by the Exobiology Quick kit group, and lowest in the Total Exosome Isolation kit group. The operating time was significantly lower in the Exobiology Quick kit group compared with the other two groups (P < 0.05). To conclude, despite a longer operating time, the differential ultracentrifugation method is a rational method to extract enough exosomes with relative high purity.

Objects The aim of this trial was to evaluate the effect of short-term high-dose atorvastatin therapy on levels of high-sensitivity C-reactive protein (hs-CRP), malonaldehyde (MDA), endothelin-1(ET-1), matrix metalloproteinases (MMPs), and left ventricular (LV) remodeling in patients with first time attack of acute anterior myocardial infarction (AAMI) .Methods A hundred and three patients with first time attack of AAMI who underwent successful primary percutaneous coronary intervention were randomized to receive atorvastatin 40 mg once daily for 1 week followed by 20 mg once daily (intensive treatment group, IT group, n=49), or atorvastatin 20 mg once daily (standard treatment group, ST group, n=54). Plasma levels of hs-CRP, MDA, ET-1, MMP-2 and MMP-9 were measured on admission, at 1 week, 2 weeks and 6 months follow up and compared between the IT group and ST group. Echocardiography was performed on admission, at 2 week, and 1 year follow up. The left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV) and left ventricular ejection fraction (LVEF) were measured at each echocardiographic examination and compared between the IT group and ST group.Results Plasma levels of hs-CRP (F=7.718, P=0.009), ET-1 (F=7.882, P=0.006), MMP-9 (F=4.834, P=0.028) and pro-BNP (F=4.603, P=0.032) were significantly lower at 1 week after initial onset of AAMI in the IT group compared with the ST group. The changes of LVEDV, LVESV, and LVEF at the 1 year follow-up from the admission did not differ between the IT group and the ST group (t=0.722, P=0.444; t=1.228, P=0.221; t=1.354, P=0.187, repectively).Conclusions Short-term high-dose atorvastatin treatment for AAMI was associated with lower hs-CRP, ET-1 and MMP-9 levels compared to the standard dose treatment. However, this beneficial effect is not likely to related to the left ventricular remodeling.

OBJECTIVETo explore the effects of simvastatin on vascular endothelial cell apoptosis and Bcl-2 protein expression in the aorta in a rat model of atherosclerosis.

METHODSThirty-six rats were randomized into control group (n=10), atherosclerosis model group (n=13) and simvastatin intervention group (n=13). In the latter two groups, rat models of atherosclerosis were established by intraperitoneal injection of vitamin D3 combined with high-fat feeding for 6 weeks, and the control rats were fed with regular diet. In the intervention group, the rats were further fed with high-fat diet with daily simvastatin treatment for 4 weeks. After the treatments, the pathological changes and plaque in the thoracic aorta were observed, and the expression of Bcl-2 protein was detected with immunohistochemistry. TUNEL assay was used to determine the apoptosis index (AI) of the vascular endothelial cells.

RESULTSCompared with that in the control group, Bcl-2 protein expression in the aorta of atherosclerotic rats was significantly decreased (P<0.05); simvastatin treatment obviously increased the expression of Bcl-2 protein in atherosclerotic rats (P<0.05) to a level similar to that in the control group. The AI was the highest in the model group (P<0.05) and comparable between the control and simvastatin treatment group.

CONCLUSIONThe therapeutic effect of simvastatin against atherosclerosis is probably mediated by up-regulation of Bcl-2 protein, which inhibits vascular endothelial cell apoptosis in rats with aortic atherosclerosis.

Objective To investigate the association between nudix hydrolase 1 (NUDT1) polymorphism and the purine-induced leukopenia.Methods A total of 176 patients with Crohn's disease were enrolled.NUDT1 rs3735092 and rs34996498 were detected using Sequenom (R) Massarray matrix-assisted laser desorption/ionization-time of flight platform.The association between different genotypes and the purine-induced leukopenia was been analysed.Results NUDT1 rs34996498 (A ＞ G) was significantly associated with the purine-induced leukopenia (P ＜0.05),and this mutation showed marginal effect after Bonferroni correction.The mutation of NUDT1 rs3735092 (C ＞ T) was not associated with the purine-induced leukopenia (P ＞ 0.05).We found female had significant higher risk of the purine-induced leukopenia than male (P ＜0.01).Conclusion NUDT1 rs34996498 polymorphism might influence the purine-induced leukopenia and further study with larger sample size was warranted.

Thymosin β4 (Tβ4) is a key factor in cardiac development, growth, disease, epicardial integrity, blood vessel formation and has cardio-protective properties. However, its role in murine embryonic stem cells (mESCs) proliferation and cardiovascular differentiation remains unclear. Thus we aimed to elucidate the influence of Tβ4 on mESCs. Target genes during mESCs proliferation and differentiation were detected by real-time PCR or Western blotting, and patch clamp was applied to characterize the mESCs-derived cardiomyocytes. It was found that Tβ4 decreased mESCs proliferation in a partial dose-dependent manner and the expression of cell cycle regulatory genes c-myc, c-fos and c-jun. However, mESCs self-renewal markers Oct4 and Nanog were elevated, indicating the maintenance of self-renewal ability in these mESCs. Phosphorylation of STAT3 and Akt was inhibited by Tβ4 while the expression of RAS and phosphorylation of ERK were enhanced. No significant difference was found in BMP2/BMP4 or their downstream protein smad. Wnt3 and Wnt11 were remarkably decreased by Tβ4 with upregulation of Tcf3 and constant β-catenin. Under mESCs differentiation, Tβ4 treatment did not change the expression of cardiovascular cell markers α-MHC, PECAM, and α-SMA. Neither the electrophysiological properties of mESCs-derived cardiomyocytes nor the hormonal regulation by Iso/Cch was affected by Tβ4. In conclusion, Tβ4 suppressed mESCs proliferation by affecting the activity of STAT3, Akt, ERK and Wnt pathways. However, Tβ4 did not influence the in vitro cardiovascular differentiation.
Animals ; Cell Cycle ; drug effects ; genetics ; Cell Differentiation ; drug effects ; Cell Movement ; drug effects ; Cell Proliferation ; drug effects ; Dose-Response Relationship, Drug ; Extracellular Signal-Regulated MAP Kinases ; genetics ; metabolism ; Gene Expression Regulation ; drug effects ; JNK Mitogen-Activated Protein Kinases ; genetics ; metabolism ; Mice ; Mouse Embryonic Stem Cells ; cytology ; drug effects ; metabolism ; Myocytes, Cardiac ; cytology ; drug effects ; metabolism ; Nanog Homeobox Protein ; genetics ; metabolism ; Octamer Transcription Factor-3 ; genetics ; metabolism ; Patch-Clamp Techniques ; Primary Cell Culture ; Proto-Oncogene Proteins c-akt ; genetics ; metabolism ; Proto-Oncogene Proteins c-fos ; genetics ; metabolism ; Proto-Oncogene Proteins c-myc ; genetics ; metabolism ; STAT3 Transcription Factor ; genetics ; metabolism ; Signal Transduction ; Thymosin ; pharmacology

OBJECTIVETo investigate the risk factors for the initial bowel resection and postoperative recurrence in a cohort of patients with Crohn disease(CD).

METHODSA total of 216 consecutive patients who were regularly followed up in the Department of Gastroenterology at the First Affiliated Hospital of Sun Yat-sen University between 2003 and 2009 were included. Probabilities for initial intestinal resection were calculated with Kaplan-Meier method. The influence of concomitant covariates on the cumulative probability rates was examined using Cox proportional hazard model. The risk of postoperative recurrence, including endoscopic recurrence, clinical recurrence and surgical recurrence, was also investigated during the follow-up. Logistic analysis was performed for the risk factors of recurrence.

RESULTSThe median follow-up was 55 months. A total of 44 patients(20.4%) underwent bowel resection. The cumulative frequency of surgery was 11%, 25%, and 45% at 1, 5, and 10 years after initial onset. Multivariate analyses showed that age at diagnosis and disease behavior were independent risk factors for initial intestinal resection(P<0.05). All but 4 patients had complete follow-up after the surgery with a median duration of 20.4 months. Endoscopic recurrence rate was 52.6% within 1 year, and clinical recurrence rate was 22.5%. Median time to clinical recurrence was 22.6 months. Multivariate analyses showed that perianal disease was the only independent risk factor for clinical recurrence(P<0.05). During the follow-up 2 patients(5%) underwent further operation and both had the same indications for the reoperation as that for the initial surgery.

CONCLUSIONSPatients with CD have a high frequency of surgery and the postoperative recurrent rate is also high. Age at diagnosis and disease behavior are associated with the probability of initial surgery. The presence of perianal disease is associated with a higher risk of clinical recurrence.

Adolescent ; Adult ; Crohn Disease ; surgery ; Digestive System Surgical Procedures ; methods ; Female ; Follow-Up Studies ; Humans ; Logistic Models ; Male ; Postoperative Period ; Proportional Hazards Models ; Recurrence ; Retrospective Studies ; Risk Factors ; Young Adult