Effects of mindful attention awareness on sleep quality of soldiers stationed in plateau areas: Chain-mediated effect of burnout and occupational stress / 环境与职业医学

Background Sleep quality is one of the important factors affecting soldiers’ task performance. Objective To explore the effects of mindful attention awareness, burnout, and occupational stress on sleep quality among soldiers in plateau areas. Methods A total of 1090 soldiers were selected from four units in plateau areas by cluster sampling method and were asked to participate a cross-sectional questionnaire survey using the Pittsburgh Sleep Quality Index (PQSI), Occupational Stress Inventory (OSI), Maslach Burnout Inventory-General Survey (MBI-GS), and Mindful Attention Awareness Scale (MAAS). Correlation analysis, regression analysis, and mediated effect test were conducted for the study. Results Of the 1090 soldiers recruited, 1082 soldiers returned valid questionnaires, and the valid recovery rate was 99.26%. The median (P25, P75) score of PSQI was 4.00 (2.00,7.00), the median score of OSI was 26.00 (17.00, 34.00), the median score of MBI-GS was 3.53 (3.13, 4.00), and the median score of MAAS was 71.00 (59.00, 82.00). The burnout and mindful attention awareness levels varied among military personnel of different age groups (P<0.05), so did the burnout and occupational stress levels among military personnel of different length of service groups (P<0.05), and the occupational stress, PSQI, burnout, and mindful attention awareness levels among military personnel with different educational backgrounds and genders (P<0.05). The results of mediated effect test showed that occupational stress and burnout had both a parallel mediated effect and a sequential mediating effect on the relationship between mindful attention awareness and sleep quality, with effect sizes of 15.3%, 21.5% and 31.8%, respectively. Conclusion There is a mediated effect on the relationship between mindful attention awareness and sleep quality by the occupational stress and burnout of military personnel in plateau areas, and sleep quality is also affected by mindful attention awareness through the chain-mediated effect of occupational stress and burnout.

Correlation analysis of hepatic steatosis, blood lipids and uric acid metabolism in elderly patients with chronic hepatitis B / 公共卫生与预防医学

Objective To analyze the correlation of hepatic steatosis with blood lipids and uric acid metabolism in elderly patients with chronic hepatitis B (CHB). Methods The clinical data of 120 patients with CHB admitted to the hospital from January to December 2021 were retrospectively analyzed. According to the presence or absence of hepatic steatosis, the patients were divided into steatosis group (n=35) and non-steatosis group (n=85). The general clinical data, serological indicators of hepatitis B virus, blood lipid and uric acid levels were compared between the two groups. The correlation of hepatic steatosis grading with blood lipids and uric acid metabolism was analyzed. Results The inflammation and fibrosis degree of liver tissues were significantly different in the two groups (P0.05). Pearson correlation analysis found that the grade of hepatic steatosis in patients with CHB was negatively correlated with liver tissue inflammation, fibrosis degree and HDL-C level (P<0.05), and positively correlated with TG and TC levels (P<0.05). Conclusion Elderly patients with CHB and hepatic steatosis have abnormal blood lipid metabolism. Hepatic steatosis will exacerbate abnormal blood lipid metabolism but not liver tissue inflammation or fibrosis degree. Clinically, attention should be paid to blood lipid monitoring of elderly patients with CHB.

Treatment outcome and influencing factors of isoniazid mono-resistant pulmonary tuberculosis / 中华传染病杂志

Objective:To analyze the outcomes of isoniazid (INH) mono-resistant pulmonary tuberculosis, and risk factors associated with adverse treatment outcomes of INH mono-resistant pulmonary tuberculosis.Methods:A total of 114 cases of INH mono-resistant pulmonary tuberculosis in Xi′an Chest Hospital from January 1, 2018 to December 31, 2020 were retrospectively recruited for analysis. The general information, clinical symptoms, and laboratory test results of patients were collected. With treatment success and adverse treatment outcomes as dependent variables, binary logistic regression analysis was used to analyze the risk factors for the adverse treatment outcome of INH mono-resistant pulmonary tuberculosis.Results:Among 114 patients with INH mono-resistant tuberculosis, 46 cases (40.4%) were cured and 41 cases (36.0%) completed treatment with the success rate of 76.3%(87/114), while 11 cases (9.6%) failed treatment, 13 cases (11.4%) lost to follow up, three cases (2.6%) died.The binary logistic regression analysis showed that male (odds ratio ( OR)=7.22, 95% confidence interval ( CI) 1.47 to 35.43)), no fever at onset ( OR=12.97, 95% CI 2.74 to 61.55), not containing amikacin in the regimen ( OR=5.28, 95% CI 1.20 to 23.31), sputum bacteria load >1+ ( OR=5.87, 95% CI 1.76 to 19.60) were the risk factors for adverse treatment outcomes of INH mono-resistant tuberculosis. Conclusions:The treatment success rate of INH mono-resistant pulmonary tuberculosis patients is high. The risk factors for adverse treatment outcome are male, no fever at the onset, not containing amikacin in the regimen, and sputum bacteria load >1+ .

Value of application of combined ultrasound and spinal CT/MRI-assisted lumbar puncture in spinal muscular atrophy patients with spinal deformities / 中华麻醉学杂志

Objective:To investigate the value of application of combined ultrasound and spinal CT/MRI-assisted lumbar puncture in spinal muscular atrophy (SMA) patients with spinal deformities.Methods:Twelve SMA patients with spinal deformities were evaluated for combined ultrasound and spinal CT/MRI imaging-assisted lumbar intrathecal administration of nusinersen between November 2021 and September 2022.The degree of difficulty of lumbar puncture in SMA patients was graded according to the spinal imaging, and then different puncture methods were designed according to different puncture difficulty grades.The success rate, preparation time, operation time, the number of attempts, and complications of lumbar puncture were counted.Results:In this study, 48 lumbar punctures were performed in 12 patients with SMA, with a success rate of 100%.The average preparation time for puncture was 13.60 min, the average puncture time was 4.96 min, and the average number of attempts was 1.33. No complications such as injury to the spinal cord, nerve and viscera were found in all patients.Conclusions:Combined ultrasound and spinal CT/MRI-assisted lumbar puncture has high value when applied for SMA patients with spinal deformities.

Detection and significance of LCN2 and PDGF-BB in serum and metastasis of lung cancer patients with bone metastasis / 临床与实验病理学杂志

Purpose To investigate the expression of lipocalin-2 (LCN2) and plateled derived growth factor-BB (PDGF-BB) in serum,carcinoma and bone metastases of lung cancer patients. Methods Protein chip were used to screen the differential expression of cytokines in serum of 19 lung cancer patients (9 patients with bone metastasis and 10 patients freedistant metastasis) . Immunohistochemistry was performed to assess the differential expression of LCN2 and PDGF-BB cytokines in 12 cases of primary lung cancer without distant metastasis and 12 cases of primary lung cancer with only bone metastasis. Results Serum level of lipid transport factor (LCN2) and PDGFBB in non-small cell lung cancer patients with bone metastasis were significantly higher than that without distant metastasis(P< 0. 05) . There was no difference cytokines between small cell lung cancer patients with bone metastasis and without metastasis group (P > 0. 05) . The results of immunohistochemistry showed that high expression of LCN2 and PDGF-BB in bone metastasis tissues was significantly higher than that in primary lung cancer tissues. Conclusions High expression of LCN2 and PDGF-BB in serum and bone metastasis tissue of patients with non-small cell lung cancer might be involved in the occurrence,development of bone metastasis of lung cancer in the bone marrow,may be an important biomarker and potential therapeutic target for bone metastasis of lung cancer.

Acupoint puncture combined with Ilizarov technique for the treatment of elderly paitents with knee osteoarthritis / 中国骨伤

OBJECTIVE@#To explore the clinical effect of acupoint puncture combined with Ilizarov technique in the treatment of knee osteoarthritis in the elderly.@*METHODS@#From March 2015 to February 2016, 76 patients with primary knee osteoarthritis were treated with tibial osteotomy acupoint puncture grouop and Ilizarov technique anatomical puncture group, including 24 males and 52 females, aged 56 to 75 years old with an average of 61.4 years old, and a course of 3 to 17 years with an average of 5.2 years. Among them, 38 cases were treated with external fixation of acupoint puncture needle and 38 cases were treated with external fixation of anatomical puncture needle. Preoperative full-length X-ray of both lower limbs showed tibial varus deformity, narrowing of medial knee joint space and enlargement of lateral knee joint space. The force line of the affected knee and lower limb was moved inward by body surface measurement, and the KSS knee function score was decreased. Symptoms included medial knee pain, flexion and extension, and conservative treatment for more than 2 years.@*RESULTS@#The lower limb force lines of both groups were corrected and the osteotomy ends healed well. No nonunion of osteotomy, inadequate correction of lower limbs or recurrence of deformity were found. Seventy-five patients were followed up for 3, 6, 12 and 24 months after operation. There was no significant difference in knee joint mobility between the two groups before operation and on 6, 12, 24 months after operation(=1.346, >0.05). There were significant difference in KSS pain and total score between the two groups at 3 months after operation, acupoint puncture group was better than anatomical puncture group(0.05).@*CONCLUSIONS@#The acupoint puncture group formed a potential acupuncture effect in the acupoint area by continuously tightening the steel needle on Ilizarov ring external fixator during the post-operative adjustment. Within three months after wearing external fixator, the knee pain symptoms of knee osteoarthritis were relieved rapidly, continuously and effectively, which was significantly better than that of the anatomical puncture group.

Determination of Lead, Arsenic and Mercury in Cream Cosmetics by Total Reflection X-Ray Fluorescence Spectrometry Using Suspension Sampling / 分析化学

A method for the determination of trace elements such as lead, arsenic and mercury in cream cosmetics by total reflection X-ray fluorescence spectrometry (TXRF) with suspension sampling was developed. The mixed solvents of water,tetrahydrofuran,methanol and were used to disperse paste, cream, and additives of triton X-100 to promote the test liquid uniform. The test suspension fluid were taken into the sample carrier,drying and then introduced into TXRF. Poly(1-vinylpyrrolidone-co-vinyl acetate) (P(VP-co-VAc)) was added to curing sediments,inhibiting proliferation. Triton X-100 and P(VP-co-VAc) were found to have the function of reducing mercury loss in the drying process. The loss of elements in the drying process and the effect of triton X-100 and P(VP-co-VAc) were investigated. The effect of cream matrix, element interference, spectral line and the inner standard were discussed. The calibration curves for quantitative analysis were established using matrix standards, so the error of software decomposition peak and the error caused by thick sample were avoided within a certain range. In this work,the linear correlation coefficients of Pb,As and Hg calibration curve were greater than 0.998 The detection limit of Pb,As and Hg in the solution were 0.005,0.004 and 0.006 μg/mL,respectively. Relative standard diviations(RSDs, n=11) of Pb, As and Hg were 7.8%-14.9%,6.6%-13.3% and 7.6%-14.6% respectively. The results of Pb, As, and Hg in cream cosmetics determinated by this method agreed with those obtained from inductively coupled plasma atomic emission spectrometry and the value of standard reference material. The TXRF method was proved to be accurate,simple and valuable in determination of trace heavy metal ions in cosmetic samples.

Application of microsutures with vascular endothelial growth factor to improve vascular endothelial regeneration after small vessel anastomosis in the rats / 中国组织工程研究

BACKGROUND:The vascular endothelial growth factor (VEGF) plays an important role in the development and formation of blood vessels.Up to now,there are few reports about the treatment of postoperative complications of vascular anastomosis surgery by mcrosutures with VEGF in China.OBJECTIVE:To synthesiize microsutures with VEGF and to evaluate its effect in revascularization following small vessel anastomosis.METHODS:The method of emulsification-diffusion was use to produce biodegradable polymer polylactic acid/glycolic acid (PLGA) copolymer microparticles containing VEGF,and then,the microparticles were added into microsutures to prepare microsutures with VEGF.Ninety Sprague-Dawley rats were enrolled to make animal models of caudal artery anastomosis using microsutures with VEGF in experimental group and microsutures alone in control group.Complications and VEGF level in the peripheral blood were detected and hematoxylin-eosin staining at the anastomotic site was performed at 2,12 hours,1,3,7 days after anastomosis.RESULTS AND CONCLUSION:(1) Postoperative complications:The postoperative incidence of skin necrosis was significantly lower in the experimental group than the control group (P ＜ 0.05).(2) VEGF level:Compared with the control group,the peripheral blood VEGF level was significantly higher in the experimental group at each time point after operation (P ＜ 0.05).(3) Hematoxylin-eosin staining:In the experimental group,proliferated endothelial cells were seen near the anastomotic site at 1 day after anastomosis;there were a large number of proliferated endothelial calls and subcutaneous tissues covering the sutures completely at 3 days after anastomosis;and endothelial cells and internal elastic lamina were completely repaired,smooth muscle cells proliferated further,and the outer membrane returned to normal at 1 week after anastomosis.In the control group,cell degeneration and necrosis were seen near the anastomotic suture,and only adventitial cells infiltrated and exhibited a traumatic proliferative response at 1 day after anastomosis;neonatal endothelial cells appeared in the exfoliated area of the endothelial cells,grew and migrated,and there was a few endothelial cells covering the anastomotic site at 3 days after anastomosis;and newborn endothelial cells got over the anastomotic crack and covered the suture.To conclude,microsutures with sustained-release VEGF microparticles can promote endothelial cell regeneration in rats at the anastomotic site.

Asymmetric oxidation synthesis of esomeprazole sodium:research advances / 国际药学研究杂志

Esomeprazole sodium is a widely used proton pump inhibitor which is mainly applied to the treatment of gastric ul-cer,duodenal ulcer,digestive esophagitis and gastritis. By reviewing the literature over the past decade on the asymmetric oxidation of esomeprazole sodium ,the paper summarizes the synthetic process and focuses on the comparison of the critical steps. To choose suit-able chiral catalyst to reduce the cost of synthesis of esomeprazole sodium,this paper compares beyond the yield,enantioselectivity and other aspects. The conclusion is that the catalysts used in the most of oxidation systems are with a large load and high cost ,and compared with the classical Kagan-Modena system,the Ti-salan catalyst has advantages in the synthesis of esomeprazole sodium,and can be widely used.

Characterization and Expression Analysis of Peroxiredoxin Genes in NNK-induced V79 Cells / 生物医学与环境科学（英文）

4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) is a potent and prevalent nitrosamine procarcinogen found in cigarette smoke. The aim of this work is to study alterations in peroxiredoxin (Prx) expression induced by NNK during carcinogenesis. Characterization of Prx genes from hamster was performed using bioinformatics. V79 cells were induced with different concentrations of NNK (0.1-0.4 mg/mL), and the expression levels of six Prx genes (Prx1-Prx6) were measured by qRT-PCR 24 h following NNK treatment. Prx gene expression was induced by NNK stress, and the highest transcription levels were induced by over 20.42-fold relative to that of the control. NNK induced alterations in Prx expression over the course of lung cancer, which means Prxs may play important roles in ROS detoxification under NNK stress and their functions are complementary.

Investigation of the cognition and behavior on drug safety in Beijing middle school students / 北京大学学报(医学版)

Objective:To understand the cognition and behavior of drug safety in Beijing middle school students and provide advice for relevant education.Methods:A cross-sectional survey using paper questionnaires was carried out on the student body of nine Beijing middle schools.Multi-stage proportionate stratified cluster sampling was adopted to enroll participants.In addition to demographic questions,the questionnaire included 17 questions assessing the cognition and behavior of safe drug use,prioritizing questions that aligned with the health education guideline for primary and secondary school students from Chinese Ministry of Education.Descriptive statistical methods were applied using the SAS 9.2 software.Results:Of the 4 220 students investigated,2 097(49.7％) were males and 2 123(50.3％) were females.The average age was (14.3 ± 1.7) years.2 030(48.1％) students were from downtown areas,1 511(35.8％) were from urban-rural linking areas and 679(16.1％) were from rural areas.Half (51.5％) of the respondents were junior high school students,and the others were from senior high schools (34.2％) and vocational high schools (14.3％).Most of the students (89.6％) lived off campus.The awareness rate of drug safety knowledge was 74.4％,the median score of drug safety behavior was 4 points (full score was 5 points) and there was a statistically positive correlation between the two (Spearman's correlation coefficient was 0.156,P ＜0.001).Both the awareness rates and the drug safety behavior scores were statistically different among the students in different regions,different school types and different residence types (P ＜ 0.001).Multiple factors analysis demonstrated the correlation between the cognition degrees of both drug safety knowledge,behavior and the above factors.Of all the students,80.4％ agreed that any drug could have adverse drug reactions;40.5％ were aware that antibiotics couldn't kill viruses;as many as 49.6％ mistook aspirin as antibiotic;97.4％ would read drug instructions before taking them;Only 42.4％ put expired drugs into special recycling bins;49.8％ would deviate from the suggested dosage and frequency of their medication when they were sick with common diseases.Conclusion:Overall,the cognition of drug safety in Beijing middle school students is good,but problems still exist in medication adherence,the management of expired drugs and the antibiotics cognition,which need to be fixed through specific,pointed way of education.And more efforts should be made to improve the cognition in rural regions,vocational high schools and on campus students.

Therapeutic effect of transforaminal endoscopic discectomy in treatment of obese patients with lumbar disc herniation / 局解手术学杂志

Objective To evaluate the efficacy of percutaneous transforaminal endoscopic discectomy ( PTED) in the treatment of obese patients with lumbar disc herniation (LDH).Methods From February 2015 to January 2017,52 obese patients with lumbar disc herniation who underwent percutaneous endoscopic surgery were included in this study .Comparison of preoperative and postoperative 1 week,3 months, 6 months and 12 months VAS,JOA and modified MacNab criteria were employed to measure the clinical outcome .Complications during and after the operation were recorded to evaluate the safety of surgery .Results All the patients were followed up for 6 to 12 months,average of 8 months.Four patients experienced abnormal sensations in the nerve root exit zone postoperatively ,and disapperaed after 3 days of treatment with dehydratio and administration of hormone .Three cases of recurrence were observed at 3 months,6 months and 7 months postoperatively and were treated by open window discetomy .The postoperative VAS scores were significantly reduced compared to that before the operation , with significant difference(P<0.05).The JOA scores had significantly improved after surgery (P<0.05).In the last follow-up,the clinical effects of modified Macnab criteria were evaluated ,excellent in 16 cases,good in 29,fair in 4 cases,poor in 3 cases,and 86.5％of patients had excellent and good outcomes .Conclusion Percutaneous transforaminal endoscopic discectomy is effective for obese patients with lumbar disc herniation ,which has the advantages of minimally invasive ,less bleeding and quick recovery for the patients .

Effects of cadmium stress on growth and physiological characteristics of Panax ginseng / 中草药

Objective: To investigate the effects of cadmium (Cd) stress on the growth and physiological characteristics of Panax ginseng (ginseng). Methods: Two-year old ginseng was cultivated in barrels in phytotrone with different concentration of Cd (0, 0.3, 1.0, 2.0, and 4.0 mg/kg) soil for a whole growth period. In red fruit stage, the contents of biomass and SPAD, the activities of anti-oxidant enzymes, and contents of malondialdehyde (MDA) were determined and analyzed. Results: With Cd concentration increasing, the relative growth rate of ginseng expressed a slowly decreasing trend, and showed negative linear correlations with Cd stress level (P stem > root. Conclusion: Ginseng has an adaptability to the contaminated soil with Cd (≤1.0 mg/kg), and at this time ginseng can enhance the activity of anti-oxidant enzyme and other physiological and biochemical responses to eliminate reactive oxygen species, maintain stability of the cell membrane, alleviate the harm from the stress of Cd; Though with Cd (>1 mg/kg), the contents of MDA could increase significantly, and the oxidative damage of ginseng is very serious. The growth of plants is affected, resulting in a decline in ginseng biomass.

Association between CYP1A1*2A polymorphism and susceptibility to childhood acute lymphoblastic leukemia: a Meta analysis / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To explore the association between CYP1A1*2A polymorphism and susceptibility to childhood acute lymphoblastic leukemia (ALL) through a Meta analysis.</p><p><b>METHODS</b>Inclusion and exclusion criteria were formulated and English and Chinese databases (PubMed, OVID Database, CBM, CNKI, and Wanfang Data) were searched comprehensively. The studies (from January 1999 to April 2015) related to the association between CYP1A1*2A polymorphism and susceptibility to childhood ALL were collected. STATA 12.0 Software was applied to perform the Meta analysis for the articles included.</p><p><b>RESULTS</b>A total of 12 articles were included for analysis (11 English articles and 1 Chinese article), which involved 3 355 cases in total. The results of the Meta analysis showed a significant association between CYP1A1*2A polymorphism and susceptibility to childhood ALL (allele model: OR=1.31, 95% CI: 1.07-1.61; dominant model: OR=1.33, 95% CI: 1.13-1.56; codominant model: OR=1.30, 95% CI: 1.10-1.54). According to the results of a subgroup analysis based on ethnic origin, an increased risk of childhood ALL was observed in both Asian subgroup (dominant model: OR=1.57, 95% CI: 1.19-2.08; codominant model: OR=1.61, 95% CI: 1.20-2.17) and the Caucasian subgroup (allele model: OR=1.31, 95% CI: 1.04-1.63; dominant model: OR=1.22, 95% CI: 1.00-1.49).</p><p><b>CONCLUSIONS</b>CYP1A1*2A polymorphism may be associated with the genetic susceptibility to childhood ALL.</p>

A Clinical Study of Sound Therapy and Psychological Counseling for Chronic Tinnitus Patients / 听力学及言语疾病杂志

Objective To investigate the clinical effects of sound therapy and psychological counseling on chronic tinnitus .Methods Two hundred and thirty - two cases of chronic tinnitus patients were treated with sound therapy and psychological counseling in this study .The time course of treatment was 12 months .Tinnitus Evalua‐tion Questionnaire(TEQ) was filled out before sound therapy ,3 ,6 and 12 months after the therapy to evaluate the effects .Results After the therapy ,the patients had a significant improvement in tinnitus symptoms .Before the therapy ,178 patients had severe tinnitus ,while after the therapy ,this number decreased obviously .In the end of treatment there were only 36 cases ,with severe tinnitus(15 .52% ) .After the 6 months treatment ,the effective rate was 79 .31% ,after 12 months the effective rate was 86 .21% .Conclusion Sound therapy and psychological counse‐ling are effective treatments for chronic tinnitus ,and the effects are stable and durable .

Effects of transforming growth factor beta 3 on the proliferation and mineralization of dental pulp stem cells from human deciduous teeth / 中国组织工程研究

BACKGROUND:The role of transforming growth factorβsuperfamily has been reported in bone mineralization of various types of stem cells, but the effects of transforming growth factorβ3 (TGF-β3) combined with heparin on proliferation and mineralization of dental pulp stem cells from human deciduous teeth remains to be studied. OBJECTIVE:To evaluate the effects of TGF-β3 on the proliferation and mineralization of dental pulp stem cells from human deciduous teeth. METHODS:The enzyme digestion method was utilized to separately culture dental pulp stem cells from human deciduous teeth. The cellcolony forming efficiency was determined. Flow cytometry was utilized to identify cellsurface marker CD146. Immunochemistry for Vimentin and STRO1 was performed to measure dental pulp stem cells from human deciduous teeth. The third passage dental pulp stem cells from human deciduous teeth cultured in vitro were intervened with heparin and TGF-β3 of 1, 5, 25μg/L mass concentration. The MTS method was applied to measure cellgrowth curves. Alizarin red staining was carried out. The changes in alkaline phosphatase activity were determined with alkaline phosphatase kit. RESULTS AND CONCLUSION:The cellcolony forming efficiency was high. cells were positive for CD146, and strongly positive for Vimentin and STRO1. Dental pulp stem cells from human deciduous teeth were identified. MTS assay indicated that there was no obvious effect on promoting proliferation of dental pulp stem cells from human deciduous teeth after stimulation of TGF-β3. Detection results of alkaline phosphatase activity demonstrated that the combination of TGF-β3 and heparin could strengthen the alkaline phosphatase activity of dental pulp stem cells from human deciduous teeth with increased concentration. Alkaline phosphatase activities were significantly higher in the TGF-β3+heparin group, TGF-β3 group and heparin group than in the control group (P<0.01). Alizarin red staining was positive in the TGF-β3+heparin group, and the staining was strongest in the 5μg/L TGF-β3+heparin group. Results indicated that TGF-β3 combined with heparin promoted mineralization of dental pulp stem cells from human deciduous teeth.

Transforming growth factor beta 3 induced odontoblast-like differentiation of stem cells from human exfoliated deciduous teeth / 中国组织工程研究

BACKGROUND:Studies have reported that the superfamily of transforming growth factors exert a role in the mineralization of various stem cells, but the combination effects of transforming growth factorβ3 and heparin on proliferation and mineralization ability of stem cells from human exfoliated deciduous teeth remains to be studied. OBJECTIVE:To explore the effect of transforming growth factorβ3 on odontoblast-like differentiation of stem cells from human exfoliated deciduous teeth. METHODS:Human deciduous teeth were col ected using enzyme digestion. The 3rd cells were incubated with 25μg/L recombinant human transforming growth factorβ3, 10 U/mL heparin or their combination. The dentin sialophosphoprotein mRNA and dentinsialoprotein expressions were detected by Q-PCR and western blot assay. Alkaline phosphatase activity was determined using alkaline phosphatase kit. RESULTS AND CONCLUSION:Stem cells from human exfoliated deciduous teeth grew wel after induction. The activity of alkaline phosphatase in the combination group was significantly higher than that in the transforming growth factorβ3, heparin and control groups (P<0.01). After combination induction, the cells were strongly positive for alizarin red staining. Results fromα-PCR and western blot assay showed that the expressions of dentin sialophosphoprotein were both remarkably increased at mRNA and protein levels. In summary, stem cells from human exfoliated deciduous teeth can differentiate into odontoblast-like cells under the induction of transforming growth factorβ3 plus heparin.

Differentiation of odontoblast-like cells from human exfoliated deciduous teeth-derived stem cells by transforming growth factor β3 in combination with heparin in vitro / 实用医学杂志

Objective To investigate the ability of human exfoliated deciduous teeth-derived stem cells (SHED) to differentiate into odontoblast-like cells. Methods SHEDs were isolated by enzyme digestion method. The 3nd passage SHEDs were incubated with 25 ng/mL recombinant human TGF-β3 , or with TGF-β3 in combination with heparin. The DSPP expression was detected by Q-PCR and Western-blotting assay. Alizarin red staining, immunhistochemistry assay and alkaline phosphatase(AKP) activity assay were performed, respectively. Result The AKP activity was enhance by TGF-β3 in combination with heparin. Alizarin red staining was positive in TGF-β3-heparin groups, with the increase of DSPP expression at both mRNA and protein level. Conclusion TGF-β3 in combination with heparin can enhance the differentiation of human exfoliated deciduous teeth-derived stem cells into odontoblast-like cells.

Thoughts on improving the multiple-site physician practice from the perspective of institutional change / 中国卫生政策研究

As an important policy, the multiple-site physician practice system is expected to promote the flow of physicians and optimize the distribution of health resources, though it is difficult to enforce in practice. From the perspective of institutional change, the fundamental reason lies in path dependence existing in system, organization and mindset:First, the government regulation system has a strong inertia to restrict the flow of physicians, and the multiple-site physician practice lacks the unity of legitimacy and rationality. Secondly, fierce competition between hospitals and the distribution pattern of rights and responsibilities between hospital and physician cause the hospitals to oppose multiple-site physician practices. Third, the stability tendency in mind and the desires for profit restrain the flow of physicians. Therefore, the institutional change of the multiple-site physician practice requires improvements in three aspects:the innovation of government systems to unlock the multiple-site physician practice must be accelerated to realize the unity of legitimacy and rationality;a change is needed in the operation logic of hospitals to control the profit incentives and management of practices by contract;the thought-pattern of physicians must be changed to con-front the proper demand for interests and build innovative incentive mechanisms.

Correlations between 6-mercaptopurine treatment-related adverse reactions in children with acute lymphoblastic leukemia and polymorphisms of thiopurine methyltransferase gene / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To explore 6-mercaptopurine (6-MP) treatment-related adverse reactions in children with acute lymphoblastic leukemia (ALL), and to assess the association between the polymorphisms of thiopurine methyltransferase (TPMT) gene and these 6-MP related toxicities.</p><p><b>METHODS</b>Total RNA was extracted from bone marrow samples of 46 children with ALL and was then reversed to cDNA. TPMT(*)1S and (*)3C were screened by denaturing gradient gel electrophoresis (DGGE) combining with DNA sequencing. Drug toxicities were classified according to national cancer institute-common toxicity criteria version 3.0 (NCI CTC 3.0). The relationship between TPMT gene polymorphisms and the adverse reactions of 6-MP treatment was analyzed.</p><p><b>RESULTS</b>During the maintenance treatment period, 22% (10/46) of children discontinued 6-MP treatment because of serious adverse reactions. Two children with TPMT(*)3C genotypes presented severe adverse reactions, including 1 child with homozygotic mutation who had 6-MP dose-related myelosuppression and hepatotoxicity. The main side effects of 6-MP were myelosuppression, hepatotoxicity and gastrointestinal reaction. And there were no significant differences between TPMT(*)1S genotypes and severe myelosuppression or hepatotoxicity caused by 6-MP (P>0.05).</p><p><b>CONCLUSIONS</b>TPMT(*)3C may correlate with severe adverse reactions caused by 6-MP.</p>