BACKGROUND: In the tooth regeneration and dental tissue engineering study, finding suitable stem cells are the central issues.OBJECTIVE: To isolate and culture child exfoliated deciduous tooth pulp stromal cells, and compare difference in dentin sialophosphoproteln expression prior to and following mineralization.DESIGN, TIME AND SETTING: The cell observational experiment was performed at the Central Laboratory of Daqing Oil Field General Hospital from December 2006 to December 2007.PARTICIPANTS: Dental pulp were obtained from exfoliated deciduous molar tooth of eight children aged from eight to ten, four males, four females. The possibility of infectious diseases, endocrine disease, dental caries and periodontal disease was excluded.METHODS: Deciduous teeth pulp stromal cells were obtained by tissue block adhesion method, and then cultured in DMEM with 10% fetal bovine serum for 14 days. Following digestion and passage, cells were incubated in DMEM/F12 supplemented with 50 pmol/L laevo-ascorbic acid, 10 nmol/L vitamin D3. 10 mmol/L Na β-glycerophosphate and 10-8 mol/L dexamethasone for another 14 days. Cells cultured in complete DMEM served as controls.MAIN OUTCOME MEASURES: Cell morphology and growth rule were observed under a microscope. Difference in dentin sialophesphoproteln expression was determined prior to and following mineralization using immunocytochemical staining.RESULTS: Dental pulp stromal cells from human exfoliated deciduous tooth, adhered to the wall, were polygon-shaped and characterized by large cell size and a relatively large nucleus and plenty cytoplasm after mineralization for 14 days. Over 80% cells were positive for dentin sialophosphoprotein. Non-induced cells were spindle, and only 2% cells were positive for dentin sialophosphoprotein.CONCLUSION: Odontogenic inductive culture might improve odontoblastic differentiation. It seems that human exfoliatod deciduous tooth pulp represents an new reservoir of adult stem cells with odontogenic potential.

Objective To evaluate effects of Atorvastatin on the levels of adiponectin and leptin and adiponectin-leptin ratio in the elderly and middle-aged patients with type 2 diabetes and combined hyperlipidemia Methods Totally 80 the elderly and middle-aged patients with type 2 diabetes and combined hyperlipidemia were treated with Atorvastatin (10mg/d) for 12 weeks.Fasting plasma levels of glucose(FPG),glycosylated hemoglobin(HbA1 c),total cholesterol (TC),triglyceride (TG),high-density lipoprotein cholesterol (HDL-C),low-density lipoprotein cholesterol(LDL-C),adiponectin(APN) and leptin(LEP) were measured at baseline and 12 weeks after treatment.And the adiponectin/leptin(A/L)ratio was calculated.Results Before versus 12 weeks after medication,TG[(4.92±1.23)mmol/L vs.(4.26±1.07)mmol/L,t=11.124,P＜ 0.001],TC[(2.69 ± 1.17) mmol/L vs.(1.66 ± 1.01) mmol/L,t=24.816,P＜0.001] and LDL-C[(2.79 ± 1.02) mmol/L vs.(1.91 ± 0.92) mmol/L,t=21.508,P＜0.001]were decreased obviously;HDL-C increased obviously [(1.03 ± 0.30) mmol/L vs.(1.33 ± 0.26) mmol/L,t =-12.011,P ＜ 0.001];APN increased slightly without statistical significance (P =0.064);LEP level decreased slightly without statistical significance(P=0.068),and A/L increased obviously(P＜ 0.05).Conclusions Atorvastatin treatment can significantly decrease TG,TC and LDL-C level in the elderly and middle-aged patients with type 2 diabetes and combined hyperlipidemia,and significantly increase HDL-C as well as A/L level,while it has no obvious influence on APN and LEP.

Practicing and learning platform was preliminary established by teachers to explore the feasibility and availability of ‘ interest-oriented research team’ in promoting professional competence among public health students.Public health students interested in interest-oriented research were recruited.Through this platform,students can learn professional knowledge and conduct practice earlier and complete their study facing the society,community and public.After four years' practice and exploration,students indeed improved the abilities of researching and practicing,therefore,the training model of ‘interest-oriented research team’ needs promoting.

Objective To evaluate the effectiveness of an activity of nutrition science experience on nutrition and food safety cog-nition among primary and secondary school students .Methods With stratified cluster sampling ,students of grade 5 and 6 in one primary school and students of grade 1 and 2 in one middle school in Chongqing were selected ,and randomly divided into interven-tion group(n= 501) and control group(n= 522) .Only conducted the activity in the intervention group .Baseline data of all the students were investigated before the intervention .Effect evaluation was performed instantly in the intervention group and control group ,and a follow-up survey carried out in the intervention group after 9 months(n= 472) .Results The nutrition knowledge scores of instant intervention group were 9 .03 ± 2 .75 and 14 .70 ± 3 .28 before and after intervention respectively (U=29 .78 ,P<0 .01);the knowledge scores of the nine months later intervention group were 12 .35 ± 2 .89 ,which were lower than instant interven-tion group(U=12 .40 ,P<0 .01) ,but higher than before intervention(U=18 .04 ,P<0 .01) .The food safety scores of instant inter-vention group ,which were higher than control group ,nine months later intervention group and before intervention(P<0 .01) .Con-clusion It is feasible and effective to conduct a nutrition science experience among primary and secondary school students .

Two hundred and four patients with diabetic nephropathy and depressive disorder were randomly assigned to the control group (40 cases), St.John's Wort extract (SWE) group(40 cases) ,SWE +psychotherapy group ( 40 cases), SWE + physicotherapy group ( 40 cases ) and SWE + psychotherapy +physicotherapy group (44 cases), all patients were treated for 12 weeks.The therapeutic effects were evaluated with Hamilton Rating Scale for Depression-17 (HAMD-17).The percentage reduction in HAMD scores in SWE + psychotherapy + physicotherapy group was the highest ( 86% ), and those for SWE, SWE +psychotherapy, SWE + physicotherapy and control groups were 47%, 55%, 60% and 13%, respectively (x2 =47.331, P =0.000).After 12 weeks of treatment, glycosylated hemoglobin(HbA1c) and urinary albumin excretion rate (UAER) were reduced in all 4 treatment groups compared with the control group.The levels of HbA1 c and UAER in SWE + psychotherapy + physicotherapy group were significantly lower than those in others ( F = 15.754,74.025, all P = 0.000).St.John' s Wort extract with psychotherapy and physicotherapy can efficiently improve the depressive disorder in type 2 diabetic patients with nephropathy, as well as control blood glucose and reduce UAER of patients.

Objective To explore the characteristics of selective attention function in patients with silent cerebral in-farction (SCI) and depression, the relationship between depression, selective attention and cognitive dysfunction. Methods Eighty-two patients with SCI and 82 normal subjects were selected and evaluated by using Hamilton Depression Rating Scale (HAMD), Montreal cognitive assessment (MoCA) and Stroop color-word test (CWT). Patients with SCI were further classified into depression subgroup and no-depression subgroup based on the score of HAMD. Results The score of MoCA was lower in SCI group (23.11 ± 5.41) and was much lower in depression subgroup (20.31 ± 5.44) compared with control group (28.70 ± 2.18) (all P<0.01). Compared with control group, the reaction times of card A, B, C and Stroop interference effects (SIE) were prolonged in SCI group. The reaction time of card A, B, C and SIE were (33.25±14.10);(42.45±15.18);(104.68 ± 25.08) and (62.24 ± 21.53) in depression subgroup, respectively. The error counts of card B, C and SIE were in-creased (P<0.05) in SCI group. The error counts of card B,C and SIE were (3.59±2.14), (15.67±7.20) and (12.08±6.46) in depression subgroup, respectively. The scores of MoCA were negatively correlated with the reaction time and error counts of SIE (r=-0.429,r=-0.500,all P<0.01).The location of infarction was correlated with the score of HAMD and error counts of SIE to some degree: both of the scores were higher in patients with left infarction compared with right infarction and were higher in patients with cortex infarction compared with subcortex infarction. Conclusion The present study revealed that patients with SCI and depression have selective attention deficit which is closely correlated with the level of cognitive function.

Objective To evaluate the value of MR in the diagnosis of primary splenic lymphoma (PSL).Methods The MR imaging features of 3 PSL cases proved by pathology were retrospectively reviewed. Results Three cases were all pathologically diagnosed as B-cell non-Hodgkin's lymphoma(NHL). Two cases were multiple node shape and one was massive shape. Unenhanced MR imaging revealed heterogeneous splenic enlargement, with large nodules showing iso-hyperinternse on T1WI and hypointense on T2WI. Linear hyperintense on T1WI and T2WI was seen on the spleen peripherous. The spleen vascular was infiltrated. CE-MRI showed heterogeneous enhancement of spleen with iso-hypointense. The focus of postperitoneal showed medial enhancement. Immunohistochemistry-showed 2 cases of diffuse B cell. The CD20 and CD19 α of tumor cell showed diffuse( + ) ,CD3 ,CD5 individual( + ) ,CD43 ( + ) ,CD45RO( + ), CD10 ( +/- ), Mum ( + ), MAC387 individual ( + ), 1 case of B lymphocell type, CD79α ( + ) ,CD23( + ) ,CD38( + ) ,λ( + ). Conclusion The MR imaging features of PSL were characteristic and helpful in the diagnosis of PSL, but the correct diagnosis was still dependent on the pathology and immunohistochemical staining.

Objective To train medical students' competence of independent thinking and problem solving and to improve the quality of teaching.MethodsThe case-based PBL teaching model was introduced to teaching practice for 25 undergraduates majoring in medical laboratory.The teaching process included pre-class mobilization,question,self-study,discussion and summary.Effectiveness of teaching was evaluated with questionnaire.Results For these medical students,the enthusiasm of learning ( 83.3％ ),ability of self-learning and information seeking ( 79.2％ ),ability of discussing and problem solving ( 79.2％ ),ability of scientific thinking and clinical reasoning ( 79.2％ ) were significantly improved.Teaching satisfaction rate of case-based PBL teaching model was up to 95.8％.ConclusionBetter results of teaching were achieved and the case-based PBL teaching model is worth spreading.

Objective To observe the level of serum hepatocyte growth factor (HGF) in patients with impaired glucose tolerance (IGT). Methods Thirty patients with IGT (IGT group), 30 patients with type 2 diabetes mellitns (T2DM) (T2DM group) and 30 healthy controls (control group) were recruited for this study. Such indexes as HGF, fasting plasma glucose (FBG), postprandial plasma glucose (2hPG), glycosylated hemoglobin A1c( GHbA1c ), fasting insulin(FINS), systolic blood pressure(SBP), diastolic blood pressure (DBP) were examined and these related factors were analyzed. Results The levels of serum HGF in IGT group and T2DM group were higher than those in control group [(413.22 ± 102.48), (422.76 ± 126.77 ), ( 120.45 ± 25.11 ) ng/L, respectively ] (P < 0.05 ). There was no significant different between IGT group and T2DM group (P> 0.05). There was positive correlation between HGF and FBG (r = 0.326, P< 0.05 ). Multiple regression analysis indicated significant correlation between HGF and DBP (r = 4.730, P< 0.05). Conclusion Higher levels of HGF are found in IGT patients, which indicates that function of vascular endothelium is abnormal in this period.

Objective To observe the level of serum hepatocyte growth factor(HGF)in patients with hypertension(HT).Methods HGF,fasting plasma glucose(FBG),postprandial plasma glucose(2hPG),glycosylated hemoglobin A1c(HbA1c),total cholesterol(TC),triglyceride(TG),systolic blood pressure(SBP),diastolic blood pressure(DBP),body mass index(BMI)and waistline(w)were detected in 30 patients with hypertension,30 patients with hypertension complicated by type 2 diabetes mellitus(T2DM),and 30 normal controls such indexes as.Results The level of serum HGF in HT group[(413.87±90.87)ng/L],and HT+T2DM group[(413.72±98.72)ng/L]were higher than that in control group[(120.45±25.11)ng/L](P＜0.05),but there was no significance between HT group and HT+T2DM group(P＞0.05).There existed a positive correlation between HGF and FBG,SBP(r=2.273,r=5.353,P＜0.05).Conclusion Higher levels of HGF is found in patients with hypertension and hypertensin complicated with T2DM,which indicates the severity of dysfunction of vascular endothelium.