BACKGROUND:Preliminary data showed that the application of human platelet lysate to human umbilical cord mesenchymal stem cell culture can better maintain the characteristics of stem cells than the application of serum-free medium. However, the serum-free medium can better improve the proliferation of mesenchymal stem cells in vitro than the human platelet lysate.OBJECTIVE:To screen out a better mesenchymal stem cell cultivation system that can greatly maintain the characteristics and proliferation rate of human umbilical cord mesenchymal stem cells.METHODS:Six human umbilical cord specimens were inoculated in six culture systems, and the primary culture of umbilical cord mesenchymal stem cell was performed. These six culture systems were respectively MesenCult serum-free medium with 2% human platelet lysate (group A), StemPro serum-free medium with 2% human platelet lysate (group B), MesenCult serum-free medium (group C), StemPro serum-free medium (group D), low glucose-DMEM with 10% fetal bovine serum (group E), low glucose-DMEM with 10% human platelet lysate (group F). The cells were subcultured at 14 days after inoculation to compare the effects of different culture systems on the morphology, surface markers, differentiation and proliferation of human umbilical cord mesenchymal stem cells.RESULTS AND CONCLUSION:(1) The morphology of passage 3 cells in group D was elongated and uneven in size. The morphology of passage 3 cells was flattened in groups E and F, but the cells in the other groups were spindle-shaped and uniform. There were no significant changes in morphology and size between passage 3 and 5 cells in A and B. In group C, the morphology of passage 5 cells was more flattened and uneven in size compared with passage 3 cells. In group D, the morphology of passage 5 cells was more elongated than that of passage 3 cell. In group E, the morphology of passage 5 cells was more flattened than that of passage 3 cells. There was no significant difference in morphology between passage 3 and 5 cells in group F. (2) The expression rate of cell surface markers had no significant difference at different passages in each group. (3) The adipoinduction and osteoinduction rates were relatively higher in groups A and B compared with groups E and F, and lowest in groups C and D. (4) The cell proliferation rate for each passages in group A was significantly higher than that in group C. The cell proliferation rate for each passage in group B was significantly higher than that in group D. The cell proliferation rate for each passage in groups E and F was significantly lower than that in groups A and B. To conclude, these results suggest that the combination of serum-free medium with human platelet lysate could better maintain the characteristics and the proliferation efficiency of mesenchymal stem cells.

Objective To explore the effect of radon released from water on the indoor radon activity concentration in groundwater supplies.Methods Two groundwater supplies in a city were chosen.Radon concentrations in three kinds of water samples were determined by using a continuous radon monitor with air-water exchanger,including source water,finished water and tap water.The solid track detector was used to analyze the indoor radon concentration in water supplies.Results The concentrations of radon in source water,finished water and tap water were (7.59 ± 1.36),(3.56 ±0.86),(3.68 ±0.81)Bq/L and (12.19 ±0.57),(7.87 ± 1.12),(9.50 t 1.12) Bq/L,respectively.The concentration of radon was the highest in source water and at less varying level in finished water and tap water.Aeration and filtration tank process significantly decreased radon activity in water.Radon concentrations in aeration and filtration rooms were 4 218 Bq/m3 and 1 937 Bq/m3,respectively,which exceeded the limit in work place (1 000 Bq/m3).Conclusions Aeration and filtration workplaces for groundwater supplies were found to contain elevated radon concentrations in air,which was released from groundwater.Radon issues in groundwater supplies in China should be paid more attention.

Exposure of gingival margin is frequently observed in anterior teeth aesthetic restoration. How to obtain an expected result is a significant challenge during prosthodontic treatment. The present article discussed gingival biotype, conditions of periodontal tissue, location of margin of restoration, gingival retraction, and provisional restoration, etc, which would affect the final aesthetic outcome of anterior teeth restorations. The aim of this article is to figure out how to effectively avoid the exposure of gingival margin in anterior teeth aesthetic restoration, and to improve the finally aesthetic outcome of anterior teeth restoration.
Esthetics ; Esthetics, Dental ; Gingiva ; Humans ; Prosthodontics

Objective:To explore the application value of conventional ultrasound(US) in detecting occult bleeding lesions in joints of patients with hemophilia.Methods:Twenty-seven children with severe hemophilia A who received factor Ⅷ prophylactic treatment from March 2017 to April 2018 in Nanfang Hospital, Southern Medical University were enrolled. Clinical data were collected from routine practice accompanied with US examination, hemophilia joint health score (HJHS) 2.1 assessment and the history of hemarthrosis of both ankles, elbows and knees at baseline and at 1 year follow-up.Results:A total of 157 joints of 27 patients were followed up for one year. During the treatments, 74 joints were found without history of hemarthrosis, among which the total US score of 14(14/74, 18.9%) joints increased, and HJHS 2.1 score of 11(11/74, 14.9%) joints developed. There was no significant change in the HJHS 2.1 score of 108 joints, among which 25 joints (25/108, 23.1%) had an increase in the total US score.However, there was no significant change in the total US score for 93 joints, of which 9(9/93, 9.7%) had an increase in HJHS 2.1 score.Conclusions:US examination can sensitively detect hemophilia arthropathy in joints without history of hemarthrosis and without obvious progression of arthropathy by HJHS 2.1 examination, and provide clinicians with more accurate joint information.

OBJECTIVETo investigate expression of the cysteinyl leukotriene receptor (CysLT1R) in hepatocellular carcinoma (HCC) tissues and determine its clinical significance.

METHODSCancerous and paraneoplastic liver tissues were collected from 30 patients with HCC and from 12 patients with liver hemangioma patients (controls). Real-time PCR and immunohistochemistry were used to evaluate the expression of CysLT1R in these tissues and assess the relationship with clinical pathological features. T-test,?Fisher's exact test and Kaplan-Meier survival analysis were used for statistical analysis.

RESULTSThe expression of CysLT1R in adjacent liver tissues (100%) was higher than that in the HCC (43.33%, P = 0.000) and normal liver tissues (41.67%, P = 0.000). The level of CysLT1R mRNA was also higher in paraneoplastic liver tissues (0.0339+/-0.0221) than in the paired HCC tissues (0.0127+/-0.0116, t = 2.911, P = 0.008) and normal liver tissues (0.0154+/-0.0123, t = -2.310, P = 0.033). There was no difference between the levels in HCC and normal liver tissues (P more than 0.05). Higher level of CysLT1R mRNA, higher level of serum alpha-fetoprotein, and higher tumor stage (III-IV) were associated with poor prognosis (respectively 4.372, P = 0.037; 24.187, P = 0.000; 8.75, P = 0.003). However, no evident relationship between the expression of CysLT1R and other clinical features was observed. Conclusions Overexpression of CysLT1R may contribute to the occurrence and progression of HCC.

Carcinoma, Hepatocellular ; diagnosis ; metabolism ; Case-Control Studies ; Disease Progression ; Humans ; Immunohistochemistry ; Kaplan-Meier Estimate ; Liver Neoplasms ; diagnosis ; metabolism ; Neoplasm Staging ; Prognosis ; RNA, Messenger ; metabolism ; Real-Time Polymerase Chain Reaction ; Receptors, Leukotriene ; metabolism ; alpha-Fetoproteins ; metabolism

Objective To explore the clinical value of neurography and nerve root sealing in treatment of multilevel lumbar spinal stenosis with lumbar instability using Endo-P/TLIF.Methods A total of 60 patients with multi-segment lumbar spinal stenosis and lumbar instability hospitalized in our hospital were included in this study From January 1,2022 to June 21,2022.All patients underwent nerve root closure angiography before surgery to confirm the responsible segments,and then the responsible segments were treated with Endo-P/TLIF.The patients were followed up for 6 months.The basic information on the age,gender,course of disease,surgical time,intraop-erative bleeding,hospitalization time,and off-bed ambulation time was collected.Then the data on VAS score,ODI score,JOA score,lumbar lordosis angle,intervertebral height,dural cross-sectional area,sacral inclination angle,pelvic projection angle,and pelvic inclination angle before,right after,3 months and 6 months after the operation were calculated.The number of responsible segments indicated by MRI and confirmed by nerve root closure angiography and the number of the single segment,double segments,3 segments,and above finally decompressed were statisti-cally analyzed.Results All patients went through the surgery safely.During the 6-month follow-up,one patient did not return to the hospital for consultation on time,and one patient was out of contact.Finally,the follow-up data of 58 patients were completely collected for statistical analysis.Fifty-five cases were remarkably improved,2 better,and 1 moderately,6 months after the operation,with a total effectiveness rate of 100%.The number of unilateral and bilateral single responsible segments confirmed by nerve root angiography and sealing was significantly larger than by MRI(P<0.05),but the number of unilateral and unilateral double,or multiple responsible segments was signifi-cantly smaller(P<0.05).There were statistically significant differences in terms of postoperative VAS score,ODI score,JOA score,VAS score,ODI score,JOA score,lumbar lordosis angle,intervertebral height,dural cross-sectional area,sacral inclination angle,pelvic inclination angle as compared to the preoperative data(P＜0.05).The pelvic projection angle was insignificantly improved as compared to the preoperative condition(P ? 0.05).Conclusion The accurate diagnosis with selective neurography and nerve root sealing improves the confirmation of responsible nerve segments before operation.Base on the accurate diagnosis,multi-segment lumbar spinal canal stenosis with lumbar instability can be effectively treated with Endo-P/TLIF,the responsible segment decompressed,trauma and bleeding reduced,hospital stay shortened,spinal physiological curvature well recovered,and clinical efficacy improved.Therefore,the method is worthy of extensive application in clinical practice.

Objective:To investigate and compare the effects of water extracts of Whitmania pigra Whitman and Hirudinaria ma-nillensis Lesson on the angiogenesis of Tg (kdrl:mCherry) zebrafish. Methods:The zebrafish embryos 6-8 hours after fertilization (6-8hpf) were transferred to the culture medium containing Whitmania pigra Whitman or Hirudinaria manillensis Lesson extract at different concentrations, and the culture medium containing the drugs was replaced every 24 h. And then, at 72 hpf, the larvalmorphology and intersegmental vessels were observed under a microscope. The hatchability of 48-and 72-hpf embryos, and the number of intersegmen-tal vessels and the heart rate of 72-hpf juveniles were measured. Results:Compared with the control group, when the concentration of Whitmania pigra Whitmanis was higher than 30μg· ml-1 , and the concentration of Hirudinaria manillensis Lesson was higher than 20μg· ml-1, the number of intersegmental vessels was significantly reduced (P<0. 01). Compared with the control group, at 48 hpf, when the concentration of the drug groups was higher than 40 μg· ml-1 , the hatchability of the two groups significantly decreased ( P<0. 01);at 72 hpf, the hatchability of Whitmania pigra Whitman decreased significantly at the concentration of 100 μg·ml-1 (P<0.01), while the hatchability of Hirudinaria manillensis Lesson decreased significantly at the concentration of 80 μg· ml-1(P <0. 01). There was no obvious yolk sac edema, pericardial edema and spine curvature in the two groups. The heart rate decreased sig-nificantly (P<0. 01), while was still within the normal range. Conclusion:Both Whitmania pigra Whitman and Hirudinaria manillen-sis Lesson have notable anti-angiogenic activity, and the anti-angiogenesis activity of Hirudinaria manillensis Lesson is stronger. They both have effects on the development of zebrafish embryos, while the toxicity is not obvious.

Health management is the process of comprehensive management for health risk factors of individuals or groups. The general practice concept when used in health management of the medical examination centers, can optimize the medical examination process and facilitate health guidance. The Health Management Center of the Fourth Affiliated Hospital of Zhejiang University School of Medicine applied such concept in its management, and found increased number of persons taking medical examinations, decreased rate of complaints, and decreases in both waiting days and registration fees by outpatients with positive medical examination outcomes. In addition, general practitioners guided the majority of people undergoing medical examinations with health prescriptions, and improved the quality of health management.

Objective:To investigate the association between serum lipid levels and inflammatory indicators in patients with primary open angle glaucoma (POAG).Methods:A case-control study was conducted.A total of 86 POAG subjects were collected as a POAG group at Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong from January 2016 to March 2022.Meanwhile, 86 with age-related cataract only, matched at age, sex and body mass index were collected as a control group.The intraocular pressure (IOP) and the mean defect of visual field (MD) were measured by Goldmann tonometer and Humphrey field analyzer, respectively.Human peripheral blood samples collected from subjects for serum lipid levels, including total cholesterol, total triglycerides, high density lipoprotein (HDL), and low density lipoprotein (LDL), were analyzed using an automated hematology analyzer and inflammatory markers including C-reactive protein, white blood cells (WBC), neutrophils, lymphocytes, monocytes, were analyzed using an automated biochemical analyzer.Indicators with statistically significant differences between the two groups were selected as independent variables, and multiple logistic regression analysis was used to determine the risk factors for POAG.Correlations between risk factors and ocular parameters (IOP and MD) were assessed using Pearson correlation analysis.This study adhered to the Declaration of Helsinki.The study protocol was approved by the Ethics Committee of Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong (No.EC20210313[2]-P03). Written informed consent was obtained from each patient before any medical examination.Results:The HDL was (1.59±0.42)mmol/L in the POAG group, which was significantly lower than (1.76±0.50)mmol/L in the control group ( t=2.435, P=0.016). The LDL was (3.34±0.66)mmol/L in the POAG group, which was significantly higher than (3.08±0.71)mmol/L in the control group ( t=2.520, P=0.013). The WBC was (6.91±1.60)×10 9/L in the POAG group, which was significantly higher than (6.11±1.29)×10 9/L in the control group ( t=3.619, P<0.001). Multiple logistic regression analysis showed that high serum LDL level ( P=0.039, OR=2.354, 95% CI: 1.105-5.303) and high WBC level ( P=0.044, OR=1.310, 95% CI: 1.007-1.703) were risk factors for POAG.Pearson correlation analysis showed that the serum LDL and WBC levels of POAG patients were moderately positively associated with IOP ( r=0.610, P<0.001; r=0.358, P=0.001). LDL level was moderately negatively associated with MD ( r=-0.496, P<0.001). WBC level was weakly negatively associated with MD ( r=-0.235, P=0.030). Conclusions:The elevated peripheral blood LDL and WBC levels are risk factors for POAG onset.The elevated LDL and WBC levels are positively correlated with IOP and negatively correlated with MD in POAG patients.

Objective To evaluate the effect of clemastine fumarate on Toll-like receptor 4/phosphatidylinositol-3-kinase/serine-threonine kinase (TLR4/PI3K/Akt) signaling pathway during hypoxia-reoxygenation (H/R) in rat cardiomyocytes.Methods H9C2 cells of rats cultured in vitro were seeded in culture wells or dishes at a density of 1×105 cells/ml and divided into 3 groups (n=11 each) by using a random number table method:control group (group C),H/R group and clemastine fumarate group (CF group).Cardiomyocytes were exposed to 5％ CO2-95％ N2in a low-glucose DMEM medium at 37℃ for 4 h followed by 4 h reoxygenation.At 4 h of reoxygenation,the cell viability was detected by CCK-8 assay,the ultrastructure was observed with a transmission electron microscope,the expression of TLR4,PI3K,phosphorylated Akt (p-Akt) and caspase-3 was detected by Western blot,and the expression of TLR4,PI3K and caspase-3 was detected by immunofluorescence.Results Compared with group C,the cell viability was significantly decreased,the expression of TLR4 and caspase-3 was up-regulated,and the expression of PI3K and p-Akt was down-regulated in group H/R (P＜0.05).Compared with group H/R,the cell viability was significantly increased,the expression of TLR4 and caspase-3 was down-regulated,the expression of PI3K and p-Akt was up-regulated (P＜0.05),and the mitochondrial damage was significantly attenuated in group CF.Conclusion The mechanism by which clemastine fumarate alleviates H/R injury to rat cardiomyocytes may be related to inhibiting TLR4 expression and activating PI3K/Akt signaling pathway.