Objective To explore the influence of different blood gas strategies on cerebral protection and blood gas analysis during moderate hypothermic cardiopulmonar.Methods Patients under cardiac valve replacement with extracorporeal circulation (ECC) were performed in this study.The cerebral blood flow (CBF) and regional cerebral oxygen saturation (rSO2) were monitored at 5 points:(1)Induction of anesthesia (T1),(2) after 10 min of the beginning of cardiopulmonary bypass (T2),(3) during the moderate hypothermic phase of CBP managed by the alpha-stat after calibrate blood gas 15 min (T3),(4) pH-stat followed,after calibrate blood gas 15 min (T4),and (5) 10 min after CBP (T5).pH and pCO2 in patients were recorded and analyzed at T3 and T4.Results The CBF of T2 and T3 was lower than that of T1,but the difference was not significant (t =2.841,2.711;P =0.062,0.080).The CBF of T4 and T5 was higher than that of T3,but the difference was not significant (t =1.793,2.135;P =0.119,0.066).The CBF of T5 resumed to before operation.The rSO2 of T2 and T3 was lower than that of T1,but the difference was not significant (t =1.821,2.032;P =0.132,0.267),the rSO2 ofT4 and T5 was higher than that ofT3,but the difference was not significant (t =1.879,2.021;P =0.312,0.075).The rSO2 of T5 resumed to before operation.However,the pH was much lower in pH-stat than alpha-stat (t =17.541,P =0.000) and the pCO2 was much higher than alpha-stat (t =13.914,P =0.000).Conclusions Both pH-stat and alpha-stat have cerebral protection effects.However,compared to pH-stat,alpha-stat could reduce the possibility of acidosis,and maintain the acid-base equilibrium.

Objective To study the role of deleted in liver cancer-1 (DLC-1) gene main domains on the regulation of human colon cancer HT29 cell proliferation.Methods Subcloning recombinant plasmid vectors with Rho GTPase activating protein (RhoGAP),sterile alpha motif (SAM) or steroidogenic acute regulatory-related lipid-transfer (START) domains of DLC-1 gene knockout were constructed and transfected into human colon cancer cell HT29.Wild HT29 cell group (control group),pcDNA3.1-HT29 cell group (vector group) and pcDNA3.1-HT29-DLC-1 cell group (whole DLC-1 gene transfected group) were set as control.The change of cell proliferation was detected by methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay and colony formation test.The cell apoptosis was analyzed by flow cytometry.The activity of RhoA protein was detected by pull-down assay.The differences between the groups were analyzed by the analysis of variance.Results At 48 hours after the successful transfection,compared with control group and vector group,cells proliferation and the activity of RhoA protein were significantly suppressed in whole DLC-1 gene transfected group (F=146.36,698.08,both P＜0.05) and early cell apoptosis increased (F=294.08,P＜0.05).Compared with control group and vector group,there was no significant difference in cell proliferation ability,cell apoptosis and the activity of RhoA protein activity in RhoGAP knockout transfected cells (F=0.99,0.049,5.769,all P＞0.05).Compared with whole DLC-1 gene transfected group,the suppression of cell proliferation was more significant in SAM knockout transfected cells (F=31.00,P＜0.05),the activity of RhoA protein down regulated (F=92.57,P＜0.05) and apoptosis increased (F=130.44,P＜0.05).Compared with whole DLC-1 gene transfected group,the ability of cell proliferation increased (F=15.47,P＜0.05),apoptosis cell decreased (F＝110.23,P＜0.05) and the activity of RhoA protein up regulated (F=199.39,P＜0.05) in START knockout transfected cells.Conclusions The role of DLC-1 gene in the suppression of cell proliferation in HT29 cells was RhoGAP-dependent.SAM domain may be the self suppression domain for endogenous RhoGAP activity.START domain may take effect through enhancing RhoGAP domain.

ObjectiveTo investigate the association between obesity phenotype and the occurrence of hypertension in middle-aged and elderly adults in China. MethodsData were obtained from the China Health and Retirement Longitudinal Study （CHARLS） in 2011 and 2015. Participants who completed two visits with ≥45 years old age at baseline were enrolled. Obesity phenotype was defined as the following four groups according to weight and metabolic status：metabolically healthy non-overweight/obesity （MHNO）， metabolically healthy overweight/obesity （MHO）， metabolically abnormal non-overweight/obesity （MANO）， and metabolically abnormal overweight/obesity （MAO）. Cox proportional risk regression model was used to analyze the relationship between obesity phenotype and the incidence of hypertension. ResultsA total of3 781 subjects with 1 775（46.95%） males and mean age of （57.76±8.57） years were included in this study. When the metabolically normal non-overweight/obese group （MHNO） was regarded as the reference group， the risk of developing hypertension was significantly increased （P<0.01） in MHO， MANO， and MAO with HRs of 1.35（1.11‒1.63）， 1.51（1.15‒1.97）， and 2.00（1.68‒2.38） respectively.ConclusionBoth MHO phenotype and MAO/MANO are significantly associated with the occurrence of hypertension in middle-aged and elderly adults.

Objective:To analyze the concentration of formic acid,propionic acid and butyric acid in gingival crevicular fluid(GCF)of patients with stages Ⅲ and Ⅳ periodontitis,and their relationship with periodontitis.Methods:The study enrolled 37 systemically healthy patients with periodontitis and 19 healthy controls who visited Department of Periodontology,Peking University School and Hospital of Sto-matology from February 2008 to May 2011.Their GCFs were collected from the mesial-buccal site of one molar or incisor in each quadrant.Periodontal clinical parameters,including plaque index(PLI),probing depth(PD),bleeding index(BI),and attachment loss(AL).Concentrations of formic acid,propionic acid and butyric acid in the supernatant of the GCFs were analyzed by high-performance capil-lary electrophoresis(HPCE).The prediction ability of formic acid,propionic acid and butyric acid with the risk of periodontitis and the differences between grade B and grade C periodontitis were analyzed.Results:In this study,32 patients with stage Ⅲ and 5 patients with stage Ⅳ were enrolled,including 9 patients with grade B and 28 patients with grade C.Clinical periodontal variables in the patients with pe-riodontitis were significantly higher than those in the control group(P＜0.001).Formic acid was signifi-cantly lower in periodontitis than that in the control group[5.37(3.39,8.49)mmol/L vs.12.29(8.35,16.57)mmol/L,P＜0.001].Propionic acid and butyric acid in periodontitis were significantly higher than those in the control group:Propionic acid,10.23(4.28,14.90)mmol/L vs.2.71(0.00,4.25)mmol/L,P＜0.001;butyric acid,2.63(0.47,3.81)mmol/L vs.0.00(0.00,0.24)mmol/L,P＜0.001.There was no significant difference in formic acid,propionic acid and butyric acid concentrations between grade B and grade C periodontitis(P＞0.05).Propionic acid and butyric acid in the deep pocket were significantly higher than in the shallow pocket,while the concentration of formic acid decreased with the increase of PD.Propionic acid(OR=1.51,95％CI:1.29-1.75)and butyric acid(OR=3.72,95％CI:1.93-7.17)were risk factors for periodontitis,while formic acid(OR=0.87,95％CI:0.81-0.93)might be a protective factor for periodontitis.Propionic acid(AUC=0.852,95％CI:0.805-0.900),butyric acid(AUC=0.889,95％CI:0.841-0.937),f(formic acid,AUC=0.844,95％CI:0.793-0.895)demonstrated a good predictive capacity for the risk of periodontitis.Conclusion:The concentration of formic acid decrease in the GCF of periodontitis patients,which is a protective factor for periodontitis,its reciprocal have good predictive capacity.However,propionic acid and butyric acid increase,which are risk factors for periodontitis and have good predictive capacity.The concentration of formic acid,propionic acid,and butyric acid vary with probing depth,but there is no significant difference between grade B and grade C periodontitis.