Clinical effect of arthroscopic reduction and suture for tibial intercondylar eminence fractures by perforated Kirschner wire / 中华实用儿科临床杂志

Objective:To investigate the clinical effect of arthroscopic reduction of tibial intercondylar ridge fractures in children using a 2.0 mm perforated Kirschner wire to establish bone tunnels and the Krackow-" 8" suture.Methods:From January 2018 to December 2020, 24 children (14 males and 10 females, aged 6-15 years) with tibial intercondylar ridge fractures admitted to Children′s Hospital of Nanjing Medical University were retrospectively recruited for analyses.All patients were treated with arthroscopic reduction, non-absorbable Krackow-" 8" suture for the base of the anterior cruciate ligament, and establishment of bone tunnels by 2.0 mm perforated Kirschner wire from the proximal tibial epiphysis for inserting a suture to fix the fractures.The affected limb was immobilized with a cast for 4 weeks, followed by active exercises postoperatively.Knee function was assessed using the Lysholm score and IKDC 2000 subjective score.Knee stability was evaluated using the Lachman test.X-rays were taken at 3 and 6 months postoperatively to evaluate fracture healing.Growth retardation of epiphyseal plate at 2 years of follow-up was assessed by bilateral knee X-rays.Results:All the 24 cases were successfully operated, with the operation time of (63.1±20.2) (40-115) min.All children were followed up for 24-36 months[(28.7±3.4) months]. All children achieved an anatomical reduction of the fracture postoperatively.No complications like fracture displacement, suture rupture, or infection were reported.All fractures healed completely at 3 months postoperatively.At the last follow-up, the Lysholm score and IKDC 2000 subjective score were (94.4±4.8) points and (93.8±5.6) points, respectively.The positive Lachman test was detected in 2 patients.No inhibition of proximal tibial epiphyseal growth was observed.Conclusions:Arthroscopic reduction with non-absorbable Krackow-" 8" suture and establishment of bone tunnels using a 2.0 mm perforated Kirschner wire for the treatment of tibial intercondylar ridge fractures in children has the advantages of simple surgical procedures, minimal invasiveness, which is an effective treatment method.

Isolation, culture and validation of CD34+ vascular wall-resident stem cells from mice / 生理学报

Vascular wall-resident stem cells (VW-SCs) play a critical role in maintaining normal vascular function and regulating vascular repair. Understanding the basic functional characteristics of the VW-SCs will facilitate the study of their regulation and potential therapeutic applications. The aim of this study was to establish a stable method for the isolation, culture, and validation of the CD34+ VW-SCs from mice, and to provide abundant and reliable cell sources for further study of the mechanisms involved in proliferation, migration and differentiation of the VW-SCs under various physiological and pathological conditions. The vascular wall cells of mouse aortic adventitia and mesenteric artery were obtained by the method of tissue block attachment and purified by magnetic microbead sorting and flow cytometry to obtain the CD34+ VW-SCs. Cell immunofluorescence staining was performed to detect the stem cell markers (CD34, Flk-1, c-kit, Sca-1), smooth muscle markers (SM22, SM MHC), endothelial marker (CD31), and intranuclear division proliferation-related protein (Ki-67). To verify the multipotency of the isolated CD34+ VW-SCs, endothelial differentiation medium EBM-2 and fibroblast differentiation medium FM-2 were used. After culture for 7 days and 3 days respectively, endothelial cell markers and fibroblast markers of the differentiated cells were evaluated by immunofluorescence staining and q-PCR. Furthermore, the intracellular Ca2+ release and extracellular Ca2+ entry signaling were evaluated by TILLvisION system in Fura-2/AM loaded cells. The results showed that: (1) High purity (more than 90%) CD34+ VW-SCs from aortic adventitia and mesenteric artery of mice were harvested by means of tissue block attachment method and magnetic microbead sorting; (2) CD34+ VW-SCs were able to differentiate into endothelial cells and fibroblasts in vitro; (3) Caffeine and ATP significantly activated intracellular Ca2+ release from endoplasmic reticulum of CD34+ VW-SCs. Store-operated Ca2+ entry (SOCE) was activated by using thapsigargin (TG) applied in Ca2+-free/Ca2+ reintroduction protocol. This study successfully established a stable and efficient method for isolation, culture and validation of the CD34+ VW-SCs from mice, which provides an ideal VW-SCs sources for the further study of cardiovascular diseases.

Epidemiological characteristics of infected patients aged 60 years and older during the outbreak of SARS-CoV-2 Omicron variant in Sanya, Hainan in 2022 / 中国热带医学

@# or older during the outbreak epidemic of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant in Sanya City, Hainan Province, August-September 2022, and to provide scientific and effective basis for formulating strategies for the prevention and treatment of COVID-19 in the elderly in the future. Methods　The data of 1 785 COVID-19 cases aged ≥60 years reported from August 1 to September 8, 2022 in Sanya City, and 537 local COVID-19 inpatients aged ≥60 years treated in Sanya Central Hospital were collected and analyzed using WPS Office 2018 software for data cleaning, database assistance, and drawing, and SPSS 22.0 software was used to statistically describe and analyze the counting data. Results　A total of 1 785 local COVID-19 cases aged ≥60 years were reported in China's Disease Prevention and Control Information System, including 1 509 confirmed cases (84.54%) and 276 asymptomatic cases (15.46%). Of the confirmed cases, 1 448 were mild cases (95.96%), 40 were common cases (2.65%), 10 were severe cases (0.66%), and 11 were critical cases (0.73%), and no deaths were reported. The ratio of male to female was 0.88∶1. The youngest was 60 years old, the oldest age was 107 years old, with a median age of 67 years old. Most of them (1 559 cases, 87.34%) were non-social employed personnel. Among them, 952 (53.33%) were from Tianya District and 733 (41.06%) from Jiyang District. Among the 537 COVID-19 elderly infected patients hospitalized in Sanya Central Hospital, infected patients with underlying diseases accounted for 287 (53.45%) cases of hypertension, diabetes and other types of basic diseases (chronic kidney disease, hyperlipidemia, chronic gastritis, gastric ulcer, etc.), and there were serious infections. Conclusions　Most of the elderly infected with Omicron variants were mild cases with few symptoms, but the elderly infected with Omicron variants were difficult to recover or even worsen the condition due to old age and underlying diseases. Therefore, by analyzing the various aspects of elderly infected cases, scientific and effective basis can be provided to prevent and control the epidemic situation in the future, and reduce the occurrence of severe, critical and death cases of COVID-19 in the elderly.

Study of incubation period of infection with 2019-nCoV Omicron variant BA.5.1.3 / 中华流行病学杂志

Objective: To study the incubation period of the infection with 2019-nCoV Omicron variant BA.5.1.3. Methods: Based on the epidemiological survey data of 315 COVID-19 cases and the characteristics of interval censored data structure, log-normal distribution and Gamma distribution were used to estimate the incubation. Bayes estimation was performed for the parameters of each distribution function using discrete time Markov chain Monte Carlo algorithm. Results: The mean age of the 315 COVID-19 cases was (42.01±16.54) years, and men accounted for 30.16%. A total of 156 cases with mean age of (41.65±16.32) years reported the times when symptoms occurred. The log-normal distribution and Gamma distribution indicated that the M (Q1, Q3) of the incubation period from exposure to symptom onset was 2.53 (1.86, 3.44) days and 2.64 (1.91, 3.52) days, respectively, and the M (Q1, Q3) of the incubation period from exposure to the first positive nucleic acid detection was 2.45 (1.76, 3.40) days and 2.57 (1.81, 3.52) days, respectively. Conclusions: The incubation period by Bayes estimation based on log-normal distribution and Gamma distribution, respectively, was similar to each other, and the best distribution of incubation period was Gamma distribution, the difference between the incubation period from exposure to the first positive nucleic acid detection and the incubation period from exposure to symptom onset was small. The median of incubation period of infection caused by Omicron variant BA.5.1.3 was shorter than those of previous Omicron variants.

Effect of miltirone on proliferation and apoptosis of leukemia THP-1 cells / 中国中药杂志

To investigate the toxicity and related mechanism of miltirone to human acute myeloid leukemia THP-1 cells. To be specific, the active components and targets of miltirone were retrieved from Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform(TCMSP), and the target proteins were converted into standard gene names with UniProt. Acute leukemia-rela-ted target genes were screened from GeneCards and DisGeNET. Venn diagram was constructed with Venny 2.1 to yield the common targets of the disease and the drug. The protein-protein interaction(PPI) network was constructed by STRING and Cytoscape 3.8.2. THP-1 cells in the logarithmic growth phase were treated with dimethyl sulfoxide(DMSO), and 2.5, 5, 10, 15, and 20 μmol·L~(-1) miltirone for 24 h, respectively. The proliferation rate of cells was analyzed by carboxyfluorescein diacetate succinimidyl ester(CFSE), apoptosis rate by flow cytometry with Annexin V-PE/7 AAD staining, and cell morphology by acridine orange staining. Real-time quantitative PCR(qPCR) was employed to detect the mRNA levels of nuclear receptor coactivator 2(NCOA2), poly(ADP-ribose) polymerase-1(PARP1), B-cell lymphoma-2(Bcl-2)-associated X protein(Bax), Bcl-2, and cysteine aspartyl protease-3(caspase-3). The effect of miltirone on apoptosis was detected in presence of caspase inhibitor Z-VAD-FMK. A total of 26 targets of miltirone, 1 046 genes related to acute leukemia, and 6 common targets of the two were screened out. Flow cytometry result showed miltirone at 10 μmol·L~(-1) can inhibit proliferation and promote apoptosis of THP-1 cells. The typical manifestations of apoptosis, such as cell shrinkage, nuclear rupture, and chromatin agglomerate were displayed by acridine orange staining. The decreased mRNA levels of NCOA2 and PARP1 and increased Bax/Bcl-2 ratio and the activity of pro-apoptotic protein caspase-3 were observed. Z-VAD-FMK can attenuate the apoptosis-inducing effect of miltirone. This study indicates that miltirone can inhibit the proliferation and promote the apoptosis of THP-1 cells, by down-regulating NCOA2 and PARP1, raising Bax/Bcl-2 ratio, and activating caspase-3.

The Prevalence and Severity of Myopia among Suburban Schoolchildren in Taiwan

<p><b>INTRODUCTION</b>We aimed to determine the prevalence and severity of myopia in suburban schoolchildren. The refractive error, best corrected visual acuity (BCVA) and other ocular indices of 6069 schoolchildren (aged 6 to 15 years) from elementary and junior high schools in Chiayi County, Taiwan were examined in 2013-2015.</p><p><b>MATERIALS AND METHODS</b>Spherical equivalent (SE) was stratified into 4 categories: emmetropia, mild myopia, moderate myopia, and high myopia for underlying analysis. Chi-squared (χ2) tests were used to determine significant associations between myopia and BCVA and age levels. To compare statistical significance among different age levels, values of Bonferroni tests were calculated. Receiver operating characteristic (ROC) curves and correlation coefficient were calculated to assess the correlation between myopia and each ocular index.</p><p><b>RESULTS</b>The youngest subject diagnosed with myopia was a 7-year-old. Myopia had significant associations with both BCVA and age levels (95% confidence intervals [CI] = 2.553, 2.713 and -0.284, -0.248, respectively), under <0.05. Among the calculated ROC values, BCVA had the highest area of 0.676 with myopia. This further confirmed that BCVA was highly correlated with myopia in schoolchildren. Other ocular indices like intraocular pressure (IOP), pupil distance, ocular alignments, or ocular height had ROC curves below 0.5 to myopia.</p><p><b>CONCLUSION</b>This study concluded that the onset of myopia started earlier and progressively worsened with years of investigation among the suburban schoolchildren. Myopia had significant associations with BCVA and age levels. To effectively reduce the prevalence and severity of myopia, it is time to take actions on eye care education for suburban schoolchildren.</p>

Quantitative peptidomic analysis of the cartilage tissues of different ages / 中国组织工程研究

BACKGROUND: There are many studies on the physiological roles of high-molecular-weight protein in cartilage tissue, but low-molecular-weight peptides are rarely investigated. OBJECTIVE: To conduct a quantitative analysis of cartilage tissue peptide in low- and high-age population, and to screen active peptides related to cartilage development from the differential peptides. METHODS: The cartilage tissue samples from six cases of low age (< 3 years old) and eight cases of high age (6-8 years old) population were collected, cartilage peptides analyzed quantitatively by liquid chromatography tandem mass spectrometry, and the differences in the peptide composition between two groups were analyzed by isotope dimethyl labeling method. RESULTS AND CONCLUSION: We identified 588 differential peptides in the cartilage tissues of two groups, which were originated from 428 proteins. Sixteen peptides were present at higher levels in the high-age group (over 4-fold expression), and 6 were present at higher levels in the low-age group (over 4-fold expression). Through analyzing the molecular mass, isoelectric point and gene ontology of the differential peptides, we preliminarily understand the characteristics of cartilage peptides at molecular level, which provides a new perspective for searching more active cartilage peptides.

Epidemiological analysis of dental caries among pupils in Shenzhen city / 口腔疾病防治

Objective@#To understand the distribution and treatment of dental caries among primary school students in Shenzhen City, and to provide a basis for prevention and treatment of dental caries of primary school students in Shenzhen City.@*Methods @#Using cluster sampling method, in the 10 districts of Shenzhen city, a total of 74 308 students in 63 primary school, were randomly selected and received examination of dental caries.@*Results@# Prevalence of caries was 15.7%. Decayed, missing and filled teeth (DMFT) was 0.37 ± 0.18. Significant differences in age and gender distribution were found (P < 0.05). There is a correlation between prevalence of permanent teeth caries and age (P < 0.05). Rate of pit and fissure sealant, filling in permanent teeth were 31.17%, 19.05%. Controlling age and gender factors, significant differences between genders were found in rate of pit and fissure sealant, filling in permanent teeth (P < 0.05).@*Conclusion@# Prevention of dental caries for pupils in Shenzhen city needs to be strengthened.

Effects of LncRNA-ATB on human peritoneal mesothelial cells phenotypic transition and proliferation induced by high glucose / 解放军医学杂志

Objective To explore the effect of long noncoding RNA-ATB (LncRNA-ATB) on phenotypic transition and proliferation of human peritoneal mesothelial cells (HPMCs) induced by high glucose.Methods HPMCs used in experiment were divided into three groups:control group,mannitol group and hypertonic glucose group.HPMCs in control group received no treatment,and in hypertonic glucose group and mannitol group were treated with 50mmol/L D-glucose and isotonic mannitol for 72 hours,respectively.Real-time PCR was employed to detect the mRNA expression of LncRNA-ATB,E-cadherin,α-smooth muscle actin (α-SMA),connective tissue growth factor (CTGF),Cyclin D1,cyclin dependent kinase inhibitor 4 (CDK4),protein 27 (p27)and proliferating cell nuclear antigen (PCNA).Western blotting was performed to detect the proteins expression of E-cadherin,α-SMA,CTGF,Cyclin D1,CDK4,p27 and PCNA,and flow cytometry was used to test the cell cycle.Lentivirus artifice was used to up-or down-regulate the expression of LncRNA-ATB in untreated HPMCs.Real-time PCR was employed to detect the mRNA expression of E-cadherin,α-SMA and CTGF,Western blotting was performed to detect the proteins expression of E-cadherin,α-SMA and CTGF,and flow cytometry was used to test the cell cycle.Results It is revealed by Real-time PCR,Western blotting and flow cytometry that the expressions increased of LncRNA-ATB,α-SMA,CTGF,Cyclin D1,CDK4 and PCNA induced by hypertonic glucose,and decreased of E-cadherin and p27 (P＜0.05).Up-regulation of LncRNA-ATB promoted HPMCs phenotypic transition and proliferation,while down-regulation alleviated HPMCs phenotypic transition and proliferation.Conclusion Hypertonic glucose may accelerate HPMCs phenotypic transition and proliferation by up-regulating the expression of LncRNA-ATB.

Angiopoietin-1 Modified Human Umbilical Cord Mesenchymal Stem Cell Therapy for Endotoxin-Induced Acute Lung Injury in Rats

PURPOSE: Angiopoietin-1 (Ang1) is a critical factor for vascular stabilization and endothelial survival via inhibition of endothelial permeability and leukocyte- endothelium interactions. Hence, we hypothesized that treatment with umbilical cord mesenchymal stem cells (UCMSCs) carrying the Ang1 gene (UCMSCs-Ang1) might be a potential approach for acute lung injury (ALI) induced by lipopolysaccharide (LPS). MATERIALS AND METHODS: UCMSCs with or without transfection with the human Ang1 gene were delivered intravenously into rats one hour after intra-abdominal instillation of LPS to induce ALI. After the rats were sacrificed at 6 hours, 24 hours, 48 hours, 8 days, and 15 days post-injection of LPS, the serum, the lung tissues, and bronchoalveolar lavage fluid (BALF) were harvested for analysis, respectively. RESULTS: Administration of fluorescence microscope confirmed the increased presence of UCMSCs in the injured lungs. The evaluation of UCMSCs and UCMSCs-Ang1 actions revealed that Ang1 overexpression further decreased the levels of the pro-inflammatory cytokines TNF-α, TGF-β1, and IL-6 and increased the expression of the anti-inflammatory cytokine IL-10 in the injured lungs. This synergy caused a substantial decrease in lung airspace inflammation and vascular leakage, characterized by significant reductions in wet/dry ratio, differential neutrophil counts, myeloperoxidase activity, and BALF. The rats treated by UCMSCs-Ang1 showed improved survival and lower ALI scores. CONCLUSION: UCMSCs-Ang1 could improve both systemic inflammation and alveolar permeability in ALI. UC-derived MSCs-based Ang1 gene therapy may be developed as a potential novel strategy for the treatment of ALI.

Delayed treatment of 51 pediatric displaced femoral neck fractures / 中华创伤骨科杂志

Objective To compare open versus closed reduction in treatment of children with displaced femoral neck fracture whose reduction is delayed by more than 24 hours.Methods We retrospectively reviewed 51 children who had been treated at our department for femoral neck fracture between May 2005 and May 2012 after their reduction had been delayed for more than 24 hours.They were 37 boys and 14 girls,1.7 to 15.5 years of age (average,9.1 years).According to Delbet's classification,27 cases belonged to type Ⅱ,18 to type Ⅲ,and 6 to type Ⅳ.Of them,18 underwent closed reduction and 33 open reduction.Their complications were recorded in detail.Their therapeutic results were evaluated according to Ratliff's criteria and compared between the 2 methods of reduction.Results The 51 children were followed up for an average of 36.7 months (range,from 17 to 61 months).Anatomic reduction was achieved in 6 cases in the closed reduction group (33.3％) and 29 cases in the open reduction group (87.9％),respectively.All fractures healed after an average of 10.9 weeks (range,from 9 to 13 weeks),with one exception of nonunion in the closed reduction group.The incidence of femoral head necrosis in the closed reduction group (27.8％,5/18) was significantly higher than that in the open reduction group (15.2％,5/33) (P ＜ 0.05).According to the Ratliff's evaluation at the final follow-ups,the good to excellent rate in the closed reduction group(66.7％,12/18) was significantly lower than that in the open reduction group (84.8％,28/33) (P ＜0.05).Coxa vara occurred in 3 children in the closed reduction group but in none in the open reduction group.Conclusion Open reduction with internal fixation may lead to better outcomes than closed reduction in the treatment of children with displaced femoral neck fracture whose reduction is delayed by more than 24 hours,probably because open reduction can result in better reduction quality.

A discussion on the practice, effect and proposal of proficiency testing program for pharmaceutical dissolution determination / 中国药学杂志

OBJECTIVE: To discuss the role of proficiency testing program for pharmaceutical dissolution determination in the capacity building of relevant laboratories. METHODS Based on the results of the two proficiency testing programs carried out in recent years, analyze the difference of the quality management and the level of dissolution determination among the participating laboratories and discuss on the way that the proficiency testing programs carried out in future. RESULT: There is difference among the laboratories in both the quality management and the level of dissolution determination, the "unsatisfactory" laboratories mainly concentrated in local drug control institutes and pharmaceutical manufacturers. The three "unsatisfactory" laboratories in the first program, took corrective and preventive measures, participated in the later program, and achieved "satisfactory" results. CONCLUSION: The proficiency testing program is effective in improving the dissolution determination capacity of the participating laboratories and is recommended to be conducted continually in the pharmaceutical industry.

Effect of Human Umbilical Cord Mesenchymal Stem Cells on Etoposide-induced Nalm-6 Cell Apoptosis / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To investigate the effect of human umbilical cord mesenchymal stem cells (hUC-MSC) on VP16-induced apoptosis of Nalm-6 cells.</p><p><b>METHODS</b>hUC-MSC were isolated and identified using morphological observation and flow cytometry, then Nalm-6 cells were treated with hUC-MSC with or without VP16. Apoptosis and cell cycle were assayed by FACS. The mRNA levels of apoptosis-related genes BCL-2, BAX and caspase-3 were detected by quantitative RT-PCR, and the protein levels of BCL-2, BAX and caspase-3 were examined by Western blot.</p><p><b>RESULTS</b>FACS showed that hUC-MSC inhibited the proliferation and decreased apoptosis of Nalm-6 cells resulted from VP16. The quantitative RT-PCR showed that hUC-MSC increased the mRNA expression level of BCL-2 and decreased the expression level of BAX and caspase-3 (P < 0.05). Western blot showed that the protein expression level of BCL-2 increased, and expression level of BAX and caspase-3 decreased in Nalm-6 cells after co-culture with hUC-MSC (P < 0.05).</p><p><b>CONCLUSION</b>hUC-MSC may protect Nalm-6 cells from apoptosis induced by VP16 through regulation of BCL-2, BAX and caspase-3.</p>

Fluoride Exposure, Follicle Stimulating Hormone Receptor Gene Polymorphism and Hypothalamus-pituitary-ovarian Axis Hormones in Chinese Women / 生物医学与环境科学（英文）

The effects of fluoride exposure on the functions of reproductive and endocrine systems have attracted widespread attention in academic circle nowadays. However, it is unclear whether the gene-environment interaction may modify the secretion and activity of hypothalamus-pituitary- ovarian (HPO) axis hormones. Thus, the aim of this study was to explore the influence of fluoride exposure and follicle stimulating hormone receptor (FSHR) gene polymorphism on reproductive hormones in Chinese women. A cross sectional study was conducted in seven villages of Henan Province, China during 2010-2011. A total of 679 women aged 18-48 years were recruited through cluster sampling and divided into three groups, i.e. endemic fluorosis group (EFG), defluoridation project group (DFPG), and control group (CG) based on the local fluoride concentration in drinking water. The serum levels of gonadotropin releasing hormone (GnRH), follicle stimulating hormone (FSH), luteinizing hormone (LH), and estradiol (E2) were determined respectively and the FSHR polymorphism was detected by real time PCR assay. The results provided the preliminary evidence indicating the gene-environment interaction on HPO axis hormones in women.

Changes in serum inflammatory factors in wheezing infants with community-acquired pneumonia / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study whether infantile wheezing pneumonia has similar immune mechanisms to asthma by determining the levels of serum inflammatory factors in wheezing infants with community-acquired pneumonia (CAP).</p><p><b>METHODS</b>Forty-two infants with CAP but without wheezing, 47 infants with CAP and wheezing, and 30 healthy infants as a control were recruited in the study. The peripheral blood levels of C-reactive protein, procalcitonin, soluble triggering receptor expressed on myeloid cell-l, interferon-γ, interleukin-4, interleukin-10, and periostin were compared in the three groups.</p><p><b>RESULTS</b>The serum levels of procalcitonin, soluble triggering receptor expressed on myeloid cell-l, interleukin-4 and interleukin-10 in the two CAP groups were higher than in the control group (P<0.05). The ratio of interferon-γ/interleukin-4 in the wheezing pneumonia group was lower than in the non-wheezing pneumonia and control groups (P<0.05). The serum level of periostin in the wheezing pneumonia group was higher than in the non-wheezing pneumonia and control groups (P<0.05).</p><p><b>CONCLUSIONS</b>The unbalanced ratio of interferon-γ/interleukin-4 and airway eosinophilic inflammation in wheezing infants with pneumonia suggest infantile pneumonia with wheezing may has similar immune mechanisms to asthma.</p>

Chondrogenic differentiation of co-cultured human umbilical cord blood-derived mesenchymal stem cells / 中国组织工程研究

10.3969/j.issn.2095-4344.2013.23.003

Immunomodulatory ability of senile mesenchymal stem cells / 中国实验血液学杂志

This study was aimed to investigate the immunomodulatory ability of human umbilical cord mesenchymal stem cells (UB-MSC) along with prolonging of culture time and increasing of passages in vitro. Mesenchymal stem cells (MSC) were isolated from human umbilical cord and cultured in vitro. The morphological changes and nucleocytoplasmic ratio of MSC were observed using Giemsa staining. MSC of the 5th passage were selected as control group, and MSC of the 13th passage were taken as senile group. The degree of cell senescence was detected by aging cells in situ test kit. Cell Counting Kit-WST-8 was used to determine the proliferation of lymphocytes in mixed lymphocytes coculture system with different passages of MSC. The expression of immunomodulation-related genes was detected by RT-PCR. The results showed that the length-breadth ratio of MSC increased and nucleocytoplasmic ratio decreased along with the increasing of passages. The senium degree of cells of the 13th passage was higher than that of the 5th passage cells. The capacity of suppressing lymphocyte proliferation of the 13th passage MSC was enhanced, compared with the 5th passage. Moreover, the expression of immunosuppression-related genes of senile MSC increased and the expression of most anti-inflammation associated genes declined as compared with young MSC by RT-PCR. It is concluded that the degree of MSC senescence gradually develops with increasing of culture passage, but the immunosuppressive ability of MSC strengthens with continuous culture.

The expression and regulatory mechanism of microRNA-708 in pediatric common B-cell acute lymphoblastic leukemia / 中华血液学杂志

<p><b>OBJECTIVE</b>To evaluate the expression of microRNAs and reveal the regulatory mechanism of miRNA-708 in pediatric common acute lymphoblastic leukemia (ALL) (common-ALL).</p><p><b>METHODS</b>The expressions of microRNAs in common-ALL patients were detected by microarrays in 3 pediatric common-ALL samples, and then verified by stem-loop quantitative RT-PCR in 34 common-ALL samples. The target genes of miR-708 were found by bioinformatics software, and verified by dual-luciferases reporter assay, RT-PCR and Western blot.</p><p><b>RESULTS</b>Compared to normal bone marrow samples, of all the 2006 detected miRNAs, the expression of miR-708, miR-181b and miR-210 were 16.886 ± 16.854, 5.710 ± 4.652, and 9.789 ± 1.178, retrospectively, being significantly up-regulated expressed than those in normal control (1.872 ± 0.339, 1.276 ± 0.531 and 1.005 ± 0.080, retrospectively) (P < 0.05), while miR-27b and miR-345 were the two most down-regulated ones (0.524 ± 0.085 and 0.675 ± 0.086, retrospectively) (normal control: 1.123 ± 0.066 and 1.204 ± 0.140, retrospectively) (P < 0.05). And the expression of miR-708 and miR-181b were significantly correlated with the clinical types in common-ALL. In high risk common-ALL, miR-708 and miR-181b were much higher than in standard and middle risk common-ALL (P < 0.05). The further verification research in 293 cell line showed that miR-708 decreased the expression level of its target genes CNTFR, NNAT and GNG12 by combining with 3'-UTR of the 3 genes, moreover, miR-708 combined with CNTFR 3'-UTR in 394 ∼ 400 bp sequence region.</p><p><b>CONCLUSION</b>MicroRNAs plays an important regulatory role during the occurrence and development of the pediatric common-ALL and miR-708 is an important factor for high risk common-ALL.</p>

Effects of stimulating in the cavum concha on glucometabolism in patients with diabetes / 中国针灸

<p><b>OBJECTIVE</b>To explore the intervention effect of the auricular stimulator in the cavum concha for diabetes.</p><p><b>METHODS</b>Forty-five cases were treated with auricular simulator in the cavum concha for 30 min, once daily for consecutive 3 months. The changes of the fasting plasma glucose (FBG), blood glucose load after 2-hour 75 g oral glucose tolerance test (P2 BG)and glycosylated hemoglobin (HbA1c) were compared before and after treatment.</p><p><b>RESULTS</b>The level of the HbA1c was obviously decreased (P < 0.05, P < 0.01), and there were also statistically significant differences in FBG and P2 BG after the treatment (P < 0.05, P < 0.01).</p><p><b>CONCLUSION</b>With the auricular stimulator, the stimulation in the cavum concha is benefit for the improvement of HbA1c of the diabetes.</p>

Establishment and characterization of lung adenocarcinoma cell line XLA-07 / 中华病理学杂志

<p><b>OBJECTIVE</b>To establish and characterize a lung adenocarcinoma cell line from a female patient in Xuanwei, Yunnan province.</p><p><b>METHODS</b>Surgical specimen of the lung adenocarcinoma was obtained and cultured immediately in RPMI 1640 medium with 10% fetal bovine serum and 10(5) U/L penicillin and 100 mg/L streptomycin. When stable proliferation of the cells was achieved after over 40 passages in culture, the biological features of the cell line were investigated by cell morphology, karyotyping, protein marker expression [cytokeratins (CKs), epithelial membrane antigen (EMA) and CD proteins], growth kinetics, cell cycle phase distribution, mitotic index, colony formation in soft agar, cell invasion and tumorigenicity in Balb/c nude mice.</p><p><b>RESULTS</b>The established cell line was stably cultured for over 80 passages during a one-year period as an anchorage-dependent monolayer of short spindle, polygonal to epithelioid cells under phase contrast microscope. Microglandular cavities and disordered microfilaments were observed under transmission electron microscope. The growth curve presented in an "S" shape with the cell population doubled every 46.7 hours. The mitotic index was 1.5% and the colony formation rate was 8.3%. The cell cycle distribution included 76.9% in G(0)/G(1), 15.1% in S and 8.0% in G(2)/M. The cell line displayed a hypotriploid karyotype with a mode of 66 chromosomes and a median of 64 chromosomes. The cells expressed CK7, CK8, CK (Pan) and EMA by immunohistochemistry. A high level of cell surface expression of CD13 and CD59 was evident by flow cytometry. The cells were able to penetrate Matrigel in vitro but failed to form a stable xenograft in nude mice.</p><p><b>CONCLUSION</b>A new human lung adenocarcinoma cell line, designated as XLA-07, is successfully established from a Xuanwei lung cancer patient.</p>