BACKGROUND:Mesenchymal stem cels isolated from cord blood and bone marrow have multi-directional differentiation ability under a certain condition of induction. OBJECTIVE:To compare the difference of differentiation of umbilical cord blood and bone marrow mesenchymal stem cels into osteoblasts. METHODS:Human umbilical cord blood and bone marrow mesenchymal stem cels were isolated and cultured by density gradient method. When reached 90% confluency, mesenchymal stem cels were digested by trypsin for subculture. At the third passage, umbilical cord blood mesenchymal stem cels and bone marrow mesenchymal stem cels at 8×104/wel were incubated. When reached 80% confluency, cels were treated with low-glucose DMEM supplemented with 10% fetal bovine serum, 0.1 μmol/L dexamethasone, 50 μmol/L vitamin C and 10 mmol/L β-sodium glycerophosphate. RESULTS AND CONCLUSION:There was no significant difference in morphology and biological properties of the two kinds of mesenchymal stem cels. Cels were highly expressed CD44, CD29, but did not express CD34. They had the ability to differentiate into osteoblasts, which had a positive staining for known markers: alkaline phospatase and calciumin vitro mineralization. There was no significant difference in the activity of osteoblasts of two kinds of cels. Results verify that umbilical cord blood and adult bone marrow mesenchymal stem cels can be induced into osteoblasts with a similar ability, and they can be used as seed cels for bone tissue engineering.

Objective To observe the clinical effects of different fluid therapies in treating severe preeclampsia complicated by ascites. Methods Between Jan. 2010 and Dec. 2012, patients with severe preeclampsia complicated by ascites in Shenzhen Maternity and Child Healthcare Hospital were included in this study. The treatment group ( n=55 ) were given intravenous drip of 6% hydroxyl starch 130/0. 4 plus furosemide, and the control group (n=52) received intravenous drip of 5%human serum albumin plus furosemide. The mean arterial pressure, respiratory rate, heart rate, oxyhemoglobin saturation, colloid osmotic pressure, hematocrit and the incidence of acute pulmonary edema were observed and compared between the two groups. Results Twenty-four hours after cesarean section, the mean arterial pressure of the treatment group was significantly lower than that of the control group, whereas heart rate and oxyhemoglobin saturation were significantly higher (all P<0. 05). The incidence of acute pulmonary edema of the control group was 17. 3%, while no patient in the treatment group developed acute pulmonary edema. On the 5th day after surgery, the hematocrit and 24 h proteinuria were significantly lower in the treatment group, while colloid osmotic pressure was higher (all P<0. 05). There was no difference in serum albumin level between the two groups (P>0. 05). The average duration of edema after treatment was significantly shorter in the treatment group [(2. 43±0. 37) d versus (3. 74±0. 59) d, P<0. 01]. Conclusion 6% hydroxyl starch 130/4. 0 plus furosemide can effectively elevate the colloid osmotic pressure, resolve edema, improve hypovolemia, sustain oxygen supply to the organs and decrease the complication of pulmonary edema in patients with severe preeclampsia complicated by ascites.

BACKGROUND:The main clinical manifestation of senile arteriosclerosis obliterans is lower limb ischemia, which is currently difficult to treat. One method is by autologous stem cell transplantation into the muscles of ischemic limbs to improve the formation of new capillaries and restore lower limb blood flow. Endothelial progenitor cell marker CD34+ cell transplantation has been shown to promote angiogenesis in ischemic limbs. Therefore, we propose that peripheral blood autologous CD34+ cell transplantation in older adult patients with atherosclerotic ischemia could effectively promote angiogenesis.OBJECTIVE:To assume that peripheral blood autologous CD34+ cell transplantation in the elderly with atherosclerotic ischemia could effectively promote angiogenesis.METHODS:This is a prospective, single-center, open-label, randomized, and controlled clinical trial that will be completed at the Qingdao No. 9 People's Hospital, China. Twenty older adult patients with atherosclerotic lower limb ischemia will be randomized into two groups. In the cell transplantation group (n=10), peripheral blood CD34+ cells transfected with vascular endothelial growth factor 165 (VEGF165) gene will be intramuscularly transplanted into the ischemic limbs in older adult patients with atherosclerotic lower limb ischemia. In the control group (n=10), normal saline will be intramuscularly injected into the ischemic limbs. All patients will be followed up for 6 months. The primary outcome will be ankle-brachial indices before and 6 months after transplantation to assess lower limb ischemia in both groups.The secondary outcomes will be the number of microvessels in the lower limb muscles before and 6 months after transplantation, the morphology of new blood vessels revealed by CT angiography, the number of VEGF-immunoreactive cells 6 months after transplantation and the incidence of adverse reactions. The trial was registered at the ClinicalTrials.gov (identifier:NCT03098771), and the study protocol was approved by the Ethics Committee of Qingdao No. 9 People's Hospital of China. All protocols will be in accordance with Declaration of Helsinki,formulated by the World Medical Association. All patients will be informed of study protocols and provide a written informed consent prior to the beginning of the trial.DISCUSSION:This trial will begin in January 2018 and finish in December 2019. We aim to quantify the effects of VEGF165 gene-modified CD34+ cell transplantation in the treatment of older adult patients with atherosclerotic ischemia to develop a new effective treatment of lower limb ischemia.

Objective To evaluate the role of thrombus elastograph (TEG) in evaluating the coagulation function of patients with acute ischemic stroke.Methods Totally 116 cases of patients with acute ischemic stroke and 116 cases of health physical examination people from our hospital were selected as case group and control group.The blood clotting index and thrombelastogram index of the groups were detected.Results In case group of acute phase,fibrinogen (FIB),two D-dimer (D-D),maximum blood clot strength (MA),0.5 h blood clot reduction rate of MA (LY30),alpha angle,integrated coagulation index (CI) and blood clot strength (G) were significantly higher than those of control group and the recovery period group.The difference was statistically significant(P＜0.01).In cases of acute phase,activated partial thromboplastin time (APTT),prothrombin time (PT),PT-INR,reaction time (R),clot formation time (K value) were significantly lower than those in the healthy control group and the recovery period cases,the difference was statistically significant (P＜0.01).MA,LY30,α Angle and CI were negatively correlated with PT,APTT,PT-INR,and were positively correlated with FIB,D-D(P＜0.05);R value,K value were positively correlated with PT,APTT,PT-INR,and were negatively correlated with FIB,D-D(P＜ 0.05).Conclusion TEG plays a significant role in monitoring and evaluating coagulation function in patients with acute ischemic stroke,and has important evaluation effect on the prognosis of disease.It is worthy of clinical application.

Objective:To establish a safe, effective, simple, and more economically feasible method to obtain platelet-rich plasma (PRP).Methods:Whole blood was collected from 24 patients with atrophic acne scars on the face. For the preparation of PRP, a slight modification of Choukroun＇s method was used. Enzyme-linked immunosorbent assay (ELISA) was used to measure the levels of platelet derived growth factor-β(PDGF-β), transforming growth factor-β1 (TGF-β1), epidermal growth factor (EGF), vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), isulin-like growth factor-1 (IGF-1) in normal plasma and PRP.Results:The average concentration of PDGF-β in PRP was (755.61±418.31) ng/L, which was higher than [(479.93±279.18) ng/L] in normal plasma ( t=3.479, P<0.01). The average concentration of TGF-β1 in PRP was (2267.00±1223.68), which was higher than [(1535.50±910.91) ng/L] in normal plasma ( t=7.082, P<0.01). The average concentration of EGF in PRP was (30.70±12.39) ng/L, which was higher than [(20.77±10.31) ng/L] in normal plasma ( t=6.899, P<0.01). The average concentration of VEGF in PRP was (25.42±17.69) ng/L, which was higher than [(12.01±7.77) ng/L] in normal plasma ( t=5.230, P<0.01). The average concentration of bFGF was (17.85±7.17) ng/L, which was higher than [(10.90±4.73) ng/L] in normal plasma ( t=6.050, P<0.01). The average concentration of IGF-1 was (201.22±36.80) ng/ml, which was higher than [(174.90±33.80) ng/ml] in normal plasma ( t=3.760, P<0.01). Conclusions:Compared to normal plasma, modified PRP contains higher levels of growth factors. The modified method is a reliable option for liquid PRP, especially applicable for invasive cosmetic laser surgery to promote wound repair.

OBJECTIVETo map the gene responsible for nonsyndromic hearing impairment in a consanguineous family.

METHODSFirstly, X chromosome scanning was used to exclude X chromosome. Secondly, candidate gene analyzing and genome scanning were performed by homozygosity mapping. Then, additional markers flanking the tightly linked marker were tested to confirm linkage and decide the candidate region.

RESULTSThe nonsyndromic hearing impairment of this family was autosomal recessive. Twenty-five known genes were excluded. Autosomal genome scanning indicated that D17S1293 was tightly linked with disease gene. And further study mapped the disease gene to a 5.07 cM interval bounded by D17S1850 and D17S1818.

CONCLUSIONThe disease gene of the family is mapped to a 5.07 cM interval between D17S1850 and D17S1818, which is a new locus of autosomal recessive nonsyndromic hearing impairment.

Chromosome Mapping ; methods ; Chromosomes, Human, Pair 17 ; genetics ; Chromosomes, Human, Pair 18 ; genetics ; Chromosomes, Human, X ; genetics ; Consanguinity ; Family Health ; Female ; Genetic Predisposition to Disease ; genetics ; Hearing Loss, Sensorineural ; genetics ; Humans ; Male ; Microsatellite Repeats ; Pedigree

OBJECTIVETo study the prevalence of methylenetetrahydrofolate reductase (MTHFR) C677T genotype and its association with deep vei n thrombophilia in Chinese.

METHODSPolymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis was conducted to examine mutation with 63 deep vein thrombophilic patients and 80 health controls in Shandong Hans. The genotype frequencies were calculated by gene counting in patients and controls, and an analysis was made on the association of MTHFR C677T mutation with deep venous thrombosis in Shandong Hans.

RESULTSIn case- controls, the frequencies of C/T heterozygote were 41.27% and 43.75%; whereas those of T/T homozygote were 52.38% and 36.25%. Significantly elevated mutation was observed in patients(Chi-square=6.372, P 0.01 OR(T/T)=4.552 95% confidence interval:1.440-14.390, Chi-square =6.742 P=0.009).

CONCLUSIONThe C677T mutation of methylenetetrahydrofolate reductase gene is a risk factor associated with deep vein thrombophilia in Shandong Hans.

China ; DNA ; genetics ; Gene Frequency ; Genotype ; Humans ; Methylenetetrahydrofolate Reductase (NADPH2) ; Odds Ratio ; Oxidoreductases Acting on CH-NH Group Donors ; genetics ; Point Mutation ; Polymorphism, Restriction Fragment Length ; Thrombophilia ; enzymology ; genetics ; Venous Thrombosis ; enzymology ; genetics

Objective To evaluate effects of fine particulate matter PM2.5 in ambient air on the proliferation,cell cycle and apoptosis of a human keratinocyte cell line HaCaT.Methods PM2.5 in hazefog episodes during the heating season was collected in Beijing from 2015 to 2016,and processed into PM2.5 suspensions.HaCaT cells were divided into several groups to be treated with culture medium alone (control group),PM2.5 suspensions at different concentrations of 100-400 mg/L (experiment groups,50-800 mg/L for observation of cellular morphology and analysis of cell proliferation) for 24 hours,or cell culture medium without cells or PM2.5 suspensions (blank group).Cellular morphological changes were observed under an inverted microscope.Cell counting kit-8 (CCK-8) assay was performed to determine cell survival rate,flow cytometry to determine the cell cycle distribution and detect cell apoptosis,and Western blot analysis to determine the protein expression of cyclin A2 and cyclin-dependent kinase1 (CDK1).Results Along with the increase of PM2.5 concentration,HaCaT cells lost their normal shape gradually,and the number of viable cells gradually decreased.Compared with the control group (100％ ± 4.95％),the 50-mg/L PM2.5 group showed no changes in cell survival rates (P ＞ 0.05),while the 100-,200-,400-and 800-mg/L PM2.5 group showed significantly lower survival rates (91.77％ ± 2.04％,80.01％ ± 1.57％,57.80％ ± 1.56％,21.98％ ± 0.86％,respectively,all P ＜ 0.05).Flow cytometry revealed that the 100-,200-and 400-mg/L PM2.5 groups showed gradually increased proportion of cells at S phase,but gradually decreased proportion of cells at G2/M phase compared with the control group (all P ＜ 0.05).As Western blot analysis showed,the protein expression of cyclin A2 and CDK1 significantly decreased in the 100-,200-and 400-mg/L PM2.5 groups compared with the control group,which was lowest in the 200-mg/L PM2.5 group(all P ＜ 0.05).In addition,the 100-,200-and 400-mg/L PM2.5 groups showed significantly higher total apoptosis rates (9.98％ ± 0.21％,12.56％ ± 0.74％,16.74％ ± 1.48％,respectively) compared with the control group (6.24％ ± 0.17％,all P ＜ 0.05).Conclusion PM2.5 can inhibit cell proliferation and promote apoptosis of HaCaT cells,likely by downregulating the expression of cyclin A2 and CDK1 and arresting HaCaT cells at S phase.

Objective To investigate sun protection behavior among middle-aged and elderly women in Beijing.Methods The central (Xuanwumen district) and peripheral areas (Yanqing district) of Beijing city were selected for investigation from May to June in 2016.By random sampling and field investigation,interviewees completed questionnaires with the help of dermatologists.Results A total of 400 females aged 40-90 years were investigated,including 190 in the Xuanwumen district and 210 in the Yanqing district.Among all the subjects,the average duration of outdoor activities was 2 hours.Moreover,117 (29.2％) of the 400 interviewees had the active sun exposure habit,including 38 (18.1％) in the Yanqing district and 79 (41.6％) in the Xuanwumen district,and the proportion of subjects with the active sun exposure habit significantly differed between the two districts (x2 =26.582,P ＜ 0.001).In addition,67 (16.8％) interviewees had a sunburn history,and 130 (32.5％) were used to applying sunscreen.The proportion of sunscreen users was significantly higher in moderately or highly educated women (103 [45.2％]) than in lowly educated women (28/172 [16.3％],P ＜ 0.001).The proportion of sunscreen users in women with skin type Ⅲ (41.2％ [70/170]) was significantly higher than that in those with skin type Ⅳ (26.5％ [61/230],P =0.002).The scores for facial skin aging and dorsal hand skin aging were both significantly lower in sunscreen users than in non-users (Z =18.536,10.731,P =0.002,0.026,respectively).Conclusion The active sun exposure habit in the middle-aged and elderly women differs between the central and peripheral areas of Beijing,and the use of sunscreen is associated with education level.

Objective This study aims to evaluate the application of BOPPPS teaching model combined with case and problem-based learning(CPBL)and the scenario simulation in cardiovascular internal medicine education.Methods The study included cardiovascular internal medicine graduates from the 2022 and 2023 cohorts.The 2022 cohort(n=12)served as the control receiving traditional teaching methods,while the 2023 cohort(n=16)was the experimental group,which utilized the BOPPPS model combined with CPBL and scenario simulation.The students theoretical examination scores were assessed and a questionnaire survey was conducted to evaluate self-assessment of abilities and teaching satisfaction among the students in the experimental group.Results The examination scores of experimental group were significantly higher(97.94±3.46)as compared to that of control group(69.13±12.88)(P＜0.05).Over 93.75%of the students in the experimental group strongly or somewhat agreed that the combined teaching model stimulated their learning interest,improved learning efficiency,facilitated their capacity building of autonomous learning,theoretical knowledge,helped establish clinical reasoning,and improved their teamwork skills.Additionally,over 93.75%of the students were highly satisfied with the course design,emphasizing key content,pro-moting teacher-student interaction,and expressed willingness to continue with this teaching method in the future.Conclusions The application of the BOPPPS teaching model combined with CPBL and scenario simulation in cardio-vascular internal medicine education achieved excellent teaching outcomes.It effectively stimulated students interest in learning,enhanced autonomous learning abilities,and received high satisfaction ratings from students.