BACKGROUND:As a kind of adult stem cel s with low immunogenicity, mesenchymal stem cel s are able to differentiate into different cel lineages in the treatment of many diseases. Moreover, mesenchymal stem cel s have been extensively used in many fields such as stem cel transplantation, immune therapy, and tissue engineering. OBJECTIVE:To review the progress of homing mechanism and the strategies to promote mesenchymal stem cel homing, thus providing a theoretical basis for transplanting mesenchymal stem cel s safely and efficiently. METHODS:The CNKI and PubMed databases were retrieved by computer for articles regarding mesenchymal stem cel homing published from 2000 to 2016, including reviews, basic and clinical studies. The key words were“mesenchymal stem cel s, homing”in Chinese and English, respectively. Then 74 papers were suitable for final analysis. RESULTS AND CONCLUSION:Mesenchymal stem cel homing needs further research, especial y the molecular mechanism of cel mobilization. Therefore, basic research about mesenchymal stem cel s should be further developed, and a standardized homing system should be established in vitro. In addition, it is of great significance to study the in vivo effects of transplanted gene-transfected mesenchymal stem cel s.

Objective To analyze the Doppler indices of uterine artery at 11-16 weeks normal gestation. Methods Two hundred and ninty-seven normal pregnant women were consecutively recruited to take routine ultrasound examination at 11-16 weeks' gestation. According to gestational week, they were divided into 6 groups (11-11+6 weeks, 12-12+6 weeks, 13-13+6 weeks, 14-14+6 weeks, 15-15+6 weeks, 16-16+6 weeks). According to the location of placenta, they were divided into 3 groups (central placenta, right placenta, left placenta). Finally, the pregnant women were divided into 5 groups (RI<0.60 group, 0.60-0.69 group, 0.70-0.79 group, 0.80-0.85 group and ≥ 0.85 group) according to resistance index (RI). Doppler indices of uterine artery were measured in each case. Results (1) The PIm, RIm, S/Dm values (the mean PI, RI, S/D values of bilateral uterine artery) were decreased with the progress of pregnancy, but the difference of the RIm, S/Dm were not significant. Only the decrease of PIm after 15 weeks was significant (P<0.05). The mean PIm of each group was:11 weeks 1.96±0.39, 12 weeks 1.94±0.45, 13 weeks 1.79±0.43, 14 weeks 1.79±0.36, 15 weeks 1.51±0.43, 16 weeks 1.50±0.30. (2) The PI, RI, S/D values of uterine artery with placenta attached were lower than the other side. In the left placenta group, bilateral RI difference was-0.04 (t=-3.095, P=0.005), bilateral PI difference was -0.24 (t=-3.232, P=0.004), bilateral S/D difference was-1.00 (t=-2.965, P=0.007);in the right placenta group, bilateral RI difference was 0.04 (t=6.159, P=0.000), bilateral PI difference was 0.43 (t=6.614, P=0.000), bilateral S/D difference was 2.05 (t=6.378, P=0.000);in the middle placenta group, bilateral RI difference was 0.02 (t=4.150, P=0.000), bilateral PI difference was 0.14 (t=4.475, P=0.000), bilateral S/D differencewas 0.54 (t=4.376, P=0.000). (3) According to the RI, incidence rates ofα-notch detected:in<0.60 group both sides were 0;in 0.60-0.69 group, left uterine artery was 0.08, right uterine artery was 0.08;in 0.70-0.79 group, left uterine artery was 0.34, right uterine artery was 0.31;in 0.80-0.85 group, left uterine artery was 0.65, right uterine artery was 0.72;in≥0.85 group, left uterine artery was 0.81, right uterine artery was 0.87. Conclusion The uterine artery Doppler indices of 11-16 weeks maybe a reliable and non-invasive method for examining uteroplacental perfusion.

Objective To compare the variations of serum cytokines before and after ozone injection with different dosages and between intra-articular injection of knee joint and autohemotransfusion injection in experimental rabbits,to make a further understanding of the biologic mechanism of ozone therapy on osteoarthritis(OA).Methods Thirty-six New Zealand white rabbits were equally and randomly divided into six groups:(1) normal group,(2) OA model group,receiving no treatment,(3) group L10,receiving 10 ?g/ml ozone per intra-articular injection,(4) group L30,receiving 30 ?g/ml ozone per intra-articular injection,(5) group S10,receiving autohemotransfusion with 10 ?g / ml of ozonized blood per injection and(6) group S30,receiving autohemotransfusion with 30 ?g/ml of ozonized blood per injection.OA models were prepared by injecting 0.5 ml of collagenase II solution into the knee joint space two times with an interval of three days.Blood samples of all groups were collected 4 weeks after the last ozone treatment for further analysis.Serum levels of NO,T-SOD,TNF-? and IL-1? were estimated.Results The serum levels of NO,T-SOD,TNF-? and IL-1? in the model group and all treated groups were significantly higher than that in normal group(P0.05).Conclusion(1) An increase in the serum levels of NO,T-SOD,TNF-? and IL-1? exists in rabbit OA models.(2) Ozone has no inhibitary effect on the serum levels of NO,T-SOD,TNF-? and IL-1?,regardless of what route of administration of ozone is adopted.(3) The effect of "oxidative preconditioning" is not local,but rather systemic.

Objective To investigate the effect of ANX A1 on the biological characteristics of papillary thyroid carcinom cells by interfering with the expression of Annexina A1 (ANX A1) in papillary thyroid carcinoma cells through small interfering RNAs (siRNA).Methods The designed highly efficient siRNA was used to conduct the specific interfence on ANXA1 expression in the papillary thyroid carcinoma TPC-1 cells.The effect of ANXA1 on TPC-1 apoptosis in PTC was observed by flow cytometry.Results The designed siRAN could efficiently inhibit the expression of ANXA1 mRNA in PTC,enhanced the cell apoptosis in TPC-1 cells in vitro.Conclusion siRNA can interfere with the expression of ANXA1 and promote the apoptosis of papillary thyroid carcinoma which suggesting that ANXA1 may be an important biological target for the treatment of papillary thyroid carcinoma.

Humans ; Jaw, Edentulous ; therapy ; Maxilla ; Prostheses and Implants

Objective To detect eight kinds of clinical common pathogenic bacteria by DNA microarray.Methods Eight kinds of common pathogenic bacteria,including Staphylococcus aureus,Pseudomonas aeruginosa,Klebsiella pneumoniae,Escherichia coli,Proteus mirabilis,Enterobacter aerogenes,Pseudomonas fluorescens,Shigella sonnei were collected.Universal primers were designed to amplify 16S rRNA gene fragment from the genomic DNA of the eight bacteria,and probes were designed in the highly variable regions.DNA microarray detection system was established and used for detection of colleted bacteria.A total of 50 samples were collected from the Zhongnan Hospital of Wuhan University,including 6 blood samples,32 sputum samples,9 feces samples and 3 bronchoscope lavage samples.DNA were extracted and detected by the established DNA microarray system.Results The desired fragments were well amplified by the self-designed universal primers.The selected probes had good detection results according to repeated detection.Of the 50 samples detected,pathgenic bacteria were accurately detected in 47 samples.Other three samples were not detected as those bacteria were not included in the chip.By optimizing the detection process,the results could be reported within 8 hours.Observation of probe signal attenuation indicated that even attenuated after 60 days,but the attenuation did not affect the results.Conclusion A microarray system was established for detection of clinical common bacteria accurately and quickly,which provided foundation for its clinical application.

Objective To develop a gene microarray system for detection of clinical common pathogenic fungi.MethodsThere were 8 clinical common fungi chosen as the subjects including Candida albicans,Candida glabrata,Candida tropicalis,Candida parapsilokis,Candida pseudotropicalis,Aspergillus terreus,Aspergillus flavus,Aspergillus oryzae,Aspergillus fumigatus.Universal primers,probes and specific probes for the PCR amplification and microarray preparation were designed in ITS region of the fungi genomic DNA.The PCR products amplified from those fungi's genome DNA were denatured and hybridized with the probes in gene microarray.The rapid detection of fungi was based on the investigation on the fluorescent signal intensity in the chip.The detection results of gene microarray system were verified by true positive and negative clinical samples.Results There were totally 25 positive samples identified by clinical routine microbiological methods.The 10 samples identified as bacteria positive were determined as negative without fluorescent signal by the fungi gene microarray,while the 12 samples identified as fungi positive were determined as positive with certain fungus by the fungi gene microarray.And 3 artificial Candida krusei samples were detected as fungi positive,while they were failure to be identified as certain fungus.There was no fluorescent signal in positions of the 8 fungi specific probes,but there was fluorescent signal in the position of fungi universal probe.It indicated that there were fungi in the samples but it couldn't identify the species of the fungi,because the Candida krusei wasn't included in the detection fungi list of the fungi gene microarray.ConclusionsThe fungi gene microarray established by the study could detect the common fungi in clinic rapidly and accurately.This study lays technology foundation for clinical application of gene chip.

OBJECTIVETo investigate the occupational health condition in a shipyard in Guangzhou, China, and to provide a basis for improving the working environment.

METHODSThe monitoring data on occupational harmful factors in the workplace and the data on health examination of the workers were analyzed, and the occupational health condition in the shipyard was evaluated with the related occupational health standards.

RESULTSExcept benzene, toluene, and electromagnetic radiation, the dust (2.02%), grinding wheel dust (3.85%), wood dust (2 out of 4 workers exceeded the standard), welding fume (16.85%), manganese dioxide (17.98%), dimethylbenzene (8.00%), and noise (53.20%) were all out of limits to different degrees. The health examination results of 2450 workers in the shipyard showed that the respiratory impairment of dust-exposed workers (3.19%) and the hearing impairment of noise-exposed workers (12.21%) were comparatively severe.

CONCLUSIONThe occupational health condition in this shipyard is not good. In order to protect the workers from health hazards, it is urgent and necessary to improve the working environment and strengthen the personal protective measures.

Air Pollutants ; Benzene ; China ; Construction Industry ; Dust ; Humans ; Noise ; Occupational Diseases ; Occupational Exposure ; Occupational Health ; Ships ; Surveys and Questionnaires ; Welding ; Workplace

Objective To discuss the optimal retrieval time of the indwelling Gunther Tulip and Cook Celcet inferior vena cava filters (VCF). Methods During the period from March 2013 to April 2015 at Shengli Oilfield Central Hospital, the implantation of retrievable inferior vena cava filter was performed in 58 patients. Among the 58 patients, Gunther Tulip VCF was used in 13 and Cook Celcet VCF was employed in 31. Twenty-one patients followed the doctor's advice to receive retrieval procedure of VCF within three months after the implantation. Results Among the 21 patients, successful retrieval of VCF was obtained in 19. The mean indwelling time of Gunther Tulip VCF was 54.4 days, the longest time being 79.0 days. Gunther Tulip VCF was successfully removed in 3 patients and retrieval of VCF failed in 2 patients, with a retrieval success rate of 60%. The mean indwelling time of Cook Celcet VCF was 37.6 days, the longest time being 67.0 days. Cook Celcet VCF was successfully removed in 16 patients, with the success rate of retrieval being 100%. Conclusion Despite many VCFs that have been indwelled for a long time can be safely retrieved, retrieval procedure should be performed as early as possible in order to improve the retrieval success rate of VCF. It seems that the use of Cook Celcet VCF is a better choice although it is more expensive.

Objective To explore the effect of whole renal perfusion imaging removal of arterial phase data on perfusion parameters of renal clear cell carcinoma using Revolution CT.Methods Perfusion imaging with Revolution CT was retrospectively analyzed in 10 patients with pathologically proven clear cell renal cell carcinoma.The z-direction coverage model was used in perfusion imaging,and the images were analyzed with CT Perfusion 4D software.All images were analyzed twice.All 23 phases data was included in group A and only 16 phases except arterial data (9-15 phases) were selected in group B.The abdominal aorta on the level of right hilus was chosen to be the input artery,and the perfusion parameter maps were obtained,including blood flow (BF),blood volume (BV),mean transit time (MTT),permeability of surface (PS).Every perfusion parameters of lesions and contralateral normal cortex,lesions and normal cortex in both groups were compared.Results The BF and PS of lesions were lower than those of normal cortex in both groups (both P＜0.05).There was no statistical difference in BV and MTT between lesions and normal cortex in both groups (all P＞0.05).There was no statistical difference in all perfusion parameters of renal clear cell carcinoma between group A and group B (all P＞0.05).The difference of BF in normal cortex between the two groups was statistically significant (P 0.009),and the difference of the PS,BV,MTT had no statistically significant (all P＞0.05).Conclusion When the duration time of renal CTP is 600 s,there is no difference between including and excluding arterial phase in all perfusion parameters of renal clear cell carcinoma.