Objective:To explore the effect of bone marrow mesenchymal stem cell transplantation on silicosis fibrosis in different time windows in rats.Methods:BMSCs were isolated and cultured from male 3-week-old SD rats in vitro.Fifty healthy female SD rats were randomly divided into 5 groups:control group,silicosis model group,early treatment group,middle treatment group,late treatment group(n=10).The silicosis model was made by one-time infusion of silica dust suspension using the non-exposed tracheal in-tubation(50 μg/ml),and 1 d,14 d,28 d of BMSCs were given for intervention therapy (1 ×106 ml-1 ).Rats in each group were sacrificed 14 days after treatment.The BMSCs identified by flow cytometry;the morphological changes of the lung tissues were observed by HE staining;the expression of MMP-9,collagen type Ⅰ and collagen type Ⅲ were detected by immunocytochemistry and Western blot analysis.Results: BMSCs in early silicosis ( 1 d ) and the middle silicosis ( 14 d ) compared to silicosis model group can significantly alleviate the pathological process of silicosis fibrosis (P<0.05),BMSCs in late silicosis (28 d) treatment had no significant effect(P>0.05).Conclusion:Exogenous BMSCs transplantation on rat silicosis early pathological processes play a role in delaying , late treatment effect is not obvious.

AIM:To observed the protective effect of diminazene aceturate(DIZE),an angiotensin-converting enzyme 2(ACE2)activator,on rats with diabetic cardiomyopathy(DCM).METHODS:Male Wistar rats(n=30)were randomly divided into normal control group ,DCM group and DIZE treatment group(DIZE group).The rats in DCM group and DIZE group were intraperitoneally injected with streptozotocin(65 mg/kg )to establish diabetic model.After 12 weeks,the diabetic rats were infused with DIZE at 15 mg· kg-1 · d-1 or the same volume of saline for 4 weeks using os-motic minipump.The cardiac function was measured at the end of the 16th week.The methods of Mason staining and HE staining were used to observe the morphological changes of the myocardial tissue.Western blot ,ELISA and immunohisto-chemistry were used to observe the changes of ACE2,angiotensin(Ang)Ⅱ,Ang-(1-7),interleukin(IL)-1,IL-6 and connective tissue growth factor(CTGF).RESULTS:DIZE significantly improved the expression of ACE 2 in diabetic rats(P<0.05).Compared with DCM group,the levels of IL-1 and IL-6 in DIZE group were significantly decreased ,and the cardiac function in DIZE group was significantly improved(P<0.05).CONCLUSION:ACE2 endogenous agonist DIZE significantly increases the ACE 2 level and reduces the level of inflammation ,thus protecting the heart function of DCM rats.

Adult ; Diagnosis, Differential ; Female ; Glycogen ; metabolism ; Glycogen Storage Disease Type II ; pathology ; Humans ; Liver ; metabolism ; pathology ; Muscle, Skeletal ; metabolism ; pathology ; Muscular Dystrophies, Limb-Girdle ; pathology ; Pyomyositis ; pathology ; Young Adult

Objective To define the maximum-tolerated dnse(MTD)and observe the side effect of escalating cisplatin with 5-fluorouracil in concurrent chemoradiotherapy for esophageal carcinoma in Chinese,with toxicity studied.Methods Previously untreated fifteen Chinese patients suffering from esophageal carcinoma received conventional fractionafiun radiotherapy,with 5 daily fractions of 2.0 Gy per week.The total radiation dose was 60 Gy.Concurrent chemotherapy dose escalation was given by the relatively safe and kidney-sparing modified Fibonacci sequence.The starting dose was cisplatin 37.5 mg/m~2 D1 and 5-fluorouracil 500 mg/m~2 D1-5, respectively.This regimen was repeated 4 times every 28 days.Escalation dose was eisplatin 7.5mg/m~2 and 5- fluorouracil 100mg/m~2.Every cohort contained at least 3 patients.If no dose-limiting toxicity(DLT)was observed, the next dose level was opened for entry.These courses were repeated until DLT appeared.MTD was declared as one dose level below which DLT appeared.Results DLT was defined as grade 3 radiation-induced esophngitis at the level of cisplatin 60 mg/m~2,5-fluorouracil 700 mg/m~2.MTD was defined as eisplafin 52.5 mg,/m~,5- fluorouracil 700 mg/m~2.The major side effect were radiation-induced esophagitis,leucopenia,nausea,vomiting and anorexia.Conclusion Maximun tolerated dose of cisplatin with 5-fluorouracil in concurrent chemoradiotherapy in the Chinese people with esophageal carcinoma were eisplatin 52.5 mg/m~2 D1,5-fluorouracil 700 mg/m~2 D1-5,repeated 4 times every 28 days.

Objective: To summarize the mid-term effect of modified extended Morrow procedure in patients with hypertrophic obstructive cardiomyopathy (HOCM) combining sub aortic valve obstruction and mid left ventricular obstruction. Methods: We studied 34 consecutive HOCM patients with sub aortic and midventricular obstruction who received modiifed extended Morrow procedure with extracorporeal circulation in our hospital from 1996-11 to 2015-01. Transthoracic echocardiography was conducted at pre-, post-operation and follow-up period to evaluate the changes of mid-ventricular gradient, subarctic gradient and each heart valve function. Results: The average follow-up time was (25.7 ± 14.9) months, 2 patients lost contact and no death occurred. In rest 32 patients, the mid ventricular gradient decreased from (60.3 ± 29.4) mmHg to (21.0 ± 19.8) mmHg, subaortic valve gradient decreased from (77.9 ± 26.2) mmHg to (11.6 ± 6.5) mmHg, the maximum ventricular septal thickness dropped from (25.2 ± 4.9) mm to (17.9 ± 7.2) mm, left atrial diameter reduced from (41.1 ± 7.8) mm to (37.6 ± 6.4) mm, left ventricular end-diastolic diameter increased from (39.8 ± 5.1) mm to (42.2 ± 4.3) mm, allP<0.05; there were 5 patients without obviously improved mid ventricular gradient because of insufifcient resection of septal myocardium in mid-ventricle. The post-operative NYHA classiifcation was improved,P<0.01, mitral valve regurgitation degree was decreased,P<0.01 and SAM phenomenon was disappeared. Complications included 3 (8.8%) patients of III atrio-ventricular block, 1 (2.9%) patient of re-admission due to poorly healed sternum combining pneumonia Conclusion: Modified extended Morrow procedure may relieve sub aortic valve and mid ventricular obstruction, therefore improve left ventricular diastolic function and prognosis in relevant patients.

Objective To set up the reference value of serum glyeated albumin (CA) in Chinese for using in clinical practice through a multi-center clinical trial. Methods Three hundred and eighty individuals with normal weight and normal glucose regulation, including 183 males and 197 females ranging from 20 to 69 years, were recruited from 10 hospitals in China. Serum GA levels were measured with liquid enzymatic method. Results (1) The GA level of the 380 subjects was (14. 5±1.9)%. When dividing these subjects by age into 3 subgroups, there was no difference in the GA levels among the 3 subgroups (P>0.05). Compared with the women, the men had higher GA level in the first subgroup aging from 20 to 39 (P =0.028). However, no significant difference was detected after adjusting with BMI as confounder.(2) When dividing those subjects by BMI into 3 subgroups, with BMI ranging from 18. 5-20. 9 kg/m2,21.0-22. 9 kg/m<'2>and 23.0-24. 9 kg/m<'2>respectively, we came to the following results: for men, there was no difference in the GA levels among the 3 subgroups (P>0.05), but for women, the GA level of the first subgroup was higher than that of the second subgroup (P =0.024). (3) The level of GA in the 2. 5th to 97.5th percentile was 10. 8%-17. 1%. (4) Sixty normal subjects were chosen to repeat evaluation of GA levels after 2-3 weeks and the GA levels were of no difference (P>0.05).Conclusion The normal range of serum GA for the Chinese population could be suggested at 11%-17%.

OBJECTIVETo investigate the effects of carnosic acid (CA) on reversal of the multidrug resistance (MDR) of human leukemia cell line K562/A02 and its mechanism.

METHODSMTT assay was used to determine the sensitivity of K562/A02 cells to adriamycin (ADM) pre-and post-treated with CA. Flow cytometry (FCM) and laser scanning confocal microscopy (LSCM) were used to measure intracellular fluorescence intensity and concentration of ADM respectively. The expression level of mdr1 was detected by semi-quantitative RT-PCR. P-glycoprotein (P-gp) expression was detected by FCM and Western blot.

RESULTSCA decreased IC(50) of ADM in K562/A02 cells from 16.31 µg/mL to 1.35 µg/mL, being a 12.08-fold decrease. The intracellular ADM fluorescence intensity of K562/A02 was increased from 17.05 to 60.53 after treated with CA (P < 0.01). In living K562/A02 cells, after treated with CA, the diffuse distribution of intracellular ADM was recovered in both nuclear and cytoplasm, and the concentration of intracellular ADM increased from 4.93µg/mL to 15.43µg/mL. RT-PCR assay showed that CA inhibited the expressions of mdr1 mRNA in K562/A02 cells (P < 0.01). Mean fluorescence intensity of P-gp detected by FCM in CA-treated K562/A02 was decreased to 22.80 as compared with that in untreated K562/A02 cells (44.40, P < 0.05).

CONCLUSIONCA can reverse the MDR of K562/A02 cells in vitro. The mechanism may be associated with down-regulation of mdr1 and inhibition of P-gp function.

ATP Binding Cassette Transporter, Sub-Family B ; ATP-Binding Cassette, Sub-Family B, Member 1 ; metabolism ; Doxorubicin ; pharmacology ; Drug Resistance, Multiple ; drug effects ; Drug Resistance, Neoplasm ; drug effects ; Humans ; K562 Cells

Animals ; beta Catenin ; Blotting, Western ; Breast Neoplasms ; Breast ; Cell Self Renewal ; Flow Cytometry ; Fluorescent Antibody Technique ; Genome ; Humans ; In Vitro Techniques ; Kinesin ; Luciferases ; Mice ; Neoplasm Metastasis ; Neoplastic Stem Cells ; Prognosis ; Real-Time Polymerase Chain Reaction ; Stem Cells

Objective: To understand the trend of changes of hygiene status in the teaching environment among primary and secondary schools in Beijing City during 2016-2020, so as to provide basis for further improving the teaching environment and campus hygiene conditions in primary and secondary schools. Methods: A proportional systematic sampling method covered over 50% of schools selected annually in Beijing from 2016 to 2019, and 34% were selected in 2020. Two representative classrooms were selected from each selected school for testing based on their structure and other factors, with 6 196 classrooms supervised, from 2016 to 2020,1 330,1 312,1 384,1 322,848 classrooms were monitored for each year. Results: From 2016 to 2020, the overall lighting qualification rate of classrooms (lighting coefficient 72.8%, window to floor area ratio 41.8%, rear wall reflectance ratio 42.2%, blackboard reflection ratio 37.4%), the overall qualification rate of average blackboard illumination and uniformity (50.6%, 34.9 %), and the overall qualification rate of desk and chair allocation (58.6%) were all below 80%. The overall qualification rate of per capita classroom area (87.5%), blackboard size (83.2%), average desk illumination ( 80.1% ), average desk illumination and uniformity (82.9%), the distance between lamp and desk (99.1%), carbon dioxide ( 86.6% ), temperature (84.9%), and noise (96.6%) were all above 80%. The following indicators, blackboard size, the distance between lamp and desk, average blackboard illumination, lighting coefficient, blackboard reflectance, rear wall reflectance, carbon dioxide, temperature, and noise ( χ 2=78.38, 9.71, 11.76, 320.59, 37.63, 58.45, 236.45, 1 347.56, 101.97), had statistically significance between years. Among those indicators, the qualified rates of blackboard size, blackboard reflectance, lighting coefficient, and noise had been increasing year by year ( χ 2 trend =69.98, 15.82, 240.02, 5.77) ( P <0.05). The qualified rates of per capita classroom area, window to floor area ratio, and blackboard reflection ratio in primary schools (81.6%, 39.8%, 36.3%) were all lower than those in secondary schools (94.9%, 44.5%, 40.3%) ( χ 2=246.32, 12.03, 10.51, P <0.05). The qualified rates of blackboard size, average blackboard illumination, average blackboard illumination and uniformity, and desk and chair allocation (89.3%, 55.6% , 36.0%, and 60.2%) were all higher than those in secondary schools (75.4%, 44.1%, 33.3%, and 56.5%) ( χ 2=209.33, 78.41, 4.44, 8.22) ( P <0.05). The qualified rates of average desk illumination and uniformity, average blackboard illumination, rear wall reflectance ratio, desk and chair allocation, carbon dioxide, temperature, and noise indicators in urban area (82.9%, 84.1% , 51.9%, 45.0%, 60.9%, 91.2%, 89.5%, 97.8%) were all higher than those in suburban area (77.3%, 81.7%, 49.2%, 39.5%, 56.3%, 82.3%, 80.4%, 95.5%) ( χ 2=31.16, 6.28, 4.36, 16.40, 13.39, 105.29, 98.23, 24.66， P <0.05). The qualified rates of the distance between lamp and desk, lighting coefficient, window to floor area ratio, blackboard size, blackboard reflection ratio, average blackboard illumination and uniformity, and per capita classroom area in urban areas (98.8%, 65.2%, 34.3%, 76.7%, 35.9%, 30.1%, 84.6%) were all lower than those in suburban areas (99.4%, 81.4%, 49.8%, 89.7%, 40.2%, 39.6%, 90.3%) ( χ 2=6.80, 171.67, 132.43, 188.46 , 12.45, 60.28, 44.82) ( P <0.05). Conclusions The main problems in the teaching environment of schools in Beijing are classroom lighting, as well as desk and chair allocation. The findings suggest technical rationality and operability of relevant standard should be considered when under revision, and standard training and supervision management should be strengthened, with the aim of teaching environment improvement.

Objective To developed A laboratory diagnosis of Moraxella catarrhalis by an laboratories diagnostic method real-time fluorescence quantitative PCR assay. Methods The specific primers and probes were designed based on the sequence of outer membrane protein CopB(copB)gene in Moraxella catarrhalis,and the Taqman probe RT-PCR method was developed to detect the Moraxella catarrhalis.The standard plasmids ex-tracted from the Moraxella catarrhalis standard strains were used to constitute the standard samples,and compared with these standard samples,the sensitivity of the fluorescence quantitative PCR assay was tested by the estab-lished standard curves.The specificity of the fluorescence quantitative PCR assay was tested by the DNA samples of other bacterias in the laboratory.Meanwhile,321 throat swab samples from inpatient and outpatient child pa-tients,with asthma infection were collected as clinical samples to validate the fluorescence quantitative PCR as-say.Results The standard curve was drawn in the real-time PCR by the Taqman fluorescence reporter.During the sensitivity tests,the newly-developed real-time fluorescence PCR could detect at least 10 copies of Moraxella catarrhalis,and could successfully distinguish several DNAs of the pathogens.On the basis of the validation result of the 321 throat swab samples,there are 25 Moraxella catarrhalis with 7.79 % positive rate.Conclusion The fluorescence quantitative PCR assay is of great sensitivity and specificity,and it can be widely used for the detec-tion of Moraxella catarrhalis.