Dental stem cells(DSCs)possess the characteristics of stem cells and can be effectively obtained from iatro-waste products (such as impacted wisdom tooth and the extracted teeth for orthodontic reason).It has been proved that DSCs are the important sources of stem cells for tissue engineering and regenerative medicine research.Research of these stem cells will create broader space for tissue engi-neering and regenerative medicine and will have important values in translational research.This review gives an overview of the research pro-gress of dental stem cells,and presents some new findings of several common dental stem cells as well as the application in tissue regenera-tion.

Objective: To design and synthesize a novel vector for rhBMP2 delivery system in tissue engineering. Methods:Dextran glycidol methacrylate(dex-GMA) was synthesized with dextran(dex) and glycidol methacrylate(GMA).Dex-GMA microspheres were prepared by suspension polymerization. The swelling behavior of the microspheres was evaluated by the swelling equilibrium parameter Q. The biodegradation properties of the dextran-based hydrogel microspheres were assessed by the surface morphology before and after biodegradation. Results:Microspheres of dex-GMA in the size(diameter) of 20 to 80 ?m with good configuration were produced. Q value of the microspheres with the diameter of 20-30 ?m was 10.9?3.3,that of those with 70-80 ?m 8.9?6.4.Stirring speed, span-80(emulsifer) quantity and the proportion of dex-GMA affected the size of the microspheres. rhBMP2 was enveloped into the microspheres. Complete degradation of the microspheres was observed during 20 to 40 days at 37 ℃ in normal saline. Conclusion: Dex-GMA hydrogel microspheres may be a release controlling system for rhBMP2 delivery.

Fifty percent TBSA third degree burns was inflicted to 24 dogs and they were treated with immediate fluid infusion (8 dogs),delayed conventional infusion (n=8),and delayed fast infusion (n=8),It was found that in the immediate and delayed fast infusiong groups,strike volume,strike index, left ventricular strike work index,right ventricular strike index and femoral arterial pressure were maintained at a level more than 50% of the normal and were gradually restored.Their pulmonary artery wedge pressure was larger than 1.3 kPa.ALT and LDH were increased but never exceeded the preburn level.DB,TB,UN,Cr,PaO2,P(A-a)O2 were maintained in the normal range.MDA RCR,ADP/O,ATP,positive blood culture rate,mortality rate and morbility of multiple organ failure were all lower than those of the delayed conventional infusion group.It is believed that in the early stage of burn injury,the development of multiple organ failure can prevented effectively with immediate infusion and partially with delayed fast infusion while delayed conventional infusion exerts no protection at all.

In order to verify the effects of postburn fluid infusion on the tissue water content,extravascular water volume,residual blood water volume,and total water volume of the major organs were measured in dogs inflicted with 50% TBSA third degree burns and the dogs received no fluid infusion,immediate infusion or delayed infusion respectively.It was found that the water contents of most of the canine organs,no matter they received fluid infusion or not,were higher than those of the control.The increase was especially marked in the extravascular water volume and less marked in the residual blood water volume,which suggests that the increase of water content of most of the organs of the burned animals results mainly from tissue edema rather than congestion and/or stasis of blood.

Objective To evaluate left ventricular function before and after percutaneous balloon mitral valvuloplasty (PBMV) by echocardiography. Methods Left ventricular function of 80 patients who underwent PBMV were estimated by echocardiography before and after operation. Results Left ventricular end-diastolic volume (EDV), cardiac output(CO), systolic volume (SV)and ejection fraction (EF) significantly increased 1 week after PBMV, but Left ventricular end-systolic volume (ESV) had no change. EF improved as mitral valve area(MVA)increased, But it had no change while the pressure gradient across the mitral valve(PG)reduced. Left ventricular function had no further improvement 3 months after PBMV. Conclusion Left ventricular function of most of the patients was improved as EDV increased after PBMV, especially early stage after PBMV. MVA was the most important factor which influenced the left ventricular function. There was no significant correlation between EF and the PG reduction after PBMV.

Objective To analyze the diabetes prevalence and it's risk factors among adults in Changsha city and provide the scientific evidence for diabetes prevention and control. Methods The stratified multi-stage cluster sampling method was used to collect data of residents(≥18 years old)from 5 counties or districts as the subjects during 2013 to 2014. The survey included structured questionnaire, physical examination and blood tests. Risk factors of diabetes were analyzed by Chi-square test and multivariate logistic regression analysis. Results A total of 19 812 subjects were investigated. The effective response subjects were 19 580; 1 970 subjects had diabetes and the crude prevalence of diabetes was 10.06%. The prevalence rates of male and female was 8.95%(746/8 335) and 10.88%(1 224/11 245) respectively, with statistically significant difference(χ2=19.80, P<0.01). The prevalence rates of urban and suburb were 11.34%(1 048/9 238)and 8.92%(922/10 342)respectively,which has statistical significance (χ2=31.82,P<0.01).The prevalence of diabetes between 1.10%and 18.03%among all age groups, which has statistical significance among different age groups(χ2=797.67, P<0.01), and increased with the increase of age(χ2trend=731.99, P<0.01). The prevalence of diabetes of those whose educational background was Junior high school, senior high school, college, bachelor or above was 10.88%(1 529/14 050), 9.06%(290/3 201), 6.94%(97/1 398), 5.84%(52/891) respectively, The difference of diabetes prevalence also showed statistical significance among population with different educational background(χ2=46.62,P<0.01). The prevalence rates of people with hypertension and without hypertension were 18.33%(1 180/6 437)and 6.02%(790/13 132) respectively, which has statistical significance(χ2=723.68, P<0.01). The results of multi variant logistic regression analysis indicated that high blood pressure(OR=2.24), obesity(OR=2.12), overweight(OR=1.48), living in urban area(OR=1.54) and high age(OR=1.36)were independent risk factors of diabetes. Conclusion The diabetes prevalence in Changsha was high. The comprehensive prevention measures according to risk factors of diabetes should be taken, especially should focus on the people 40 years of age or older, with high blood pressure, being overweight or obese and living in urban area.

ObjectiveTo investigate the association between the FCRL5 gene (rs6427384 and rs12036228) single nucleotide polymorphism(SNP) and patients with ankylosing spondylitis (AS). Methods SNP of FCRL5 gene (rs6427384 and rs12036228) was analyzed in 169 patients with AS and 184 healthy controls by ligase detection reaction based on high temperature(LDR)-PCR. The distribution of FCRL5 genotypes and allele frequencies were detected between the two groups. Chi-square test, one-way ANOVA were used for statistical analysis. ResultsSignificant differences were found in the distribution of allele frequencies of FCRL5 gene between AS patients and health controls(P＜0.05). The C allele frequencies of FCRL5 gene at positions of rs6427384 and rs12036228 were 17.3％, 92.3％ and 25.0％, 87.2％ respectively in the AS group and the control group. And the T allele frequencies of rs6427384 and rs12036228 were 82.7％, 7.7％ and 75.0％, 12.8％ in the AS group and the control group. The percentages of CC, CT and TT genotype(rs6427384) were 3.7％, 27.2％, and 69.1％ in the AS group, which were significantly different from those of the control group(3.9％, 42.2％ and 53.9％ ) (x2=8.7637, P=0.0125 ). Staging of sacroiliitis in X ray were significantly different during AS patients whose genotype represented as CC, CT and TT (rs6427384)(x2=34.159, P=0.0001 ). Incidences of the initial symptoms (low back pain or inflammation of periphery joint)in the AS group were obviously differed among patients with different genotypes (rs6427384) (x2=7.254, P=0.027), so did the mean duration of morning stiffness (F=4.159, P=0.018) and the average scores of BASDAI (F=4.461, P=0.014). Incidences of the initial symptoms in the AS group were also conspicuously different between the AS patients with different genotypes (rs 12036228 ) (x2=6.640, P=0.036 ). ConclusionOur study suggests that the SNP(rs6427384 and rs12036228) of FCRL5 may be a susceptibility factor for AS in Anhui Han population and the genotype may influence the clinical phenotype of AS.

Objective To investigate the association between interleukin(IL)-1F7 gene (rs3811047)single nucleotide polymorphism (SNP) and ankylosing spondylitis (AS). Methods SNP of IL-1F7 gene (rs3811047) was analyzed in 158 patients with AS and 181 healthy controls by ligase detection reaction based on high temperature ligase (LDR-PCR). The distribution of IL-1 F7 (rs3811047 ) genotypes and allele frequencies were detected between the two groups. Results Significant differences were found in the distribution of IL-1F7(rs3811047 ) genotypes and allele frequencies between AS patients and healthy controls. The frequency of A allele of IL-1F7 gene at positions rs3811047 was 12.03% and 17.68% in AS group and the control group,and the frequency of G allele was 87.97%, 82.32%, respectively (x2=4.2204, P=0.0399). The percentage of AA, AG and GG genotype was 0, 24.05%, 75.95% in AS group, which differed from the controls group (2.76%, 29.83%, 67.41% ). The difference had remarkable statistical significance (x2=6.2675, P=0.043).The positive rate of HLA-B27 in AS patients which represented as AG genotype was 70.27% (26/37),remarkably lower than that in AS patients which represented as GG genotype 94.23% (98/104), the difference was statistically significant (x2=2.168, P=0.030), erythrocyte sedimentation rate and C reactive protein levels were conspicuously lower than that in GG genotype (t=2.971, P=0.013; t=3.300, P=0.001 ). Conclusion Our study suggests that the SNP (rs3811047) of IL-1F7 may be a susceptibile factor for AS in Anhui Han population, the genotype may influence the clinical phenotypes of AS.Patients who carry the A allele may have less inflammation than patients who do not carry the A allele.

As a novel concept for cell delivery,cell sheet may retain the extracellular matrix and adhesive proteins,avoid the use of bioma-terials for delivery,and increase cell survival rate while reduce cell loss following cell transplantation.This review summarizes the use of cell sheet technology for periodontal and pulp-dentin complex regeneration,highlights recent progresses and future challenges in this field.

Along with recent advances in biological signal molecule and tissue engineering technology,periodontal regeneration has been gained more and more new opportunities,but also faces many challenges.This paper briefly reviewes the preclinical and clinical studies of periodontal tissue regeneration,highlighting the latest achievement and progress in the clinical study of biological signal molecules and stem cell therapy in the treatment of periodontal disease worldwide.