Objective To characterize the major physiological and biochemical indexes of rabbits introduced to Tibet plateau,to provide the essential reference in experimental studies on rabbits,and to serve the relevant clinical treatment,teaching work and scientific research.Methods Twelve serum biochemical parameters of Californian rabbits and Chinese white rabbits introduced to Tibet since 20 years ago were measured with an automatic biochemistry analyzer.Results In the California rabbits,the values of ALB,TP,A/G,CRE,CHOL and LDH were very significantly higher in males than those in females(P<0.01),and ALT,GLU were significantly higher in females(P<0.05).In the Chinese white rabbits,the value of CRE was significantly higher in males than that in females,but the value of LDH was higher than that in males(P<0.01).There were significant differences between the values of AST,TP,ALB and GLO,A/G,GLU,CRE,LDH(P<0.01),and TG and BUN (P<0.05) in Californian and Chinese white rabbits.The values of AST,TP,BUN and LDH were very significantly different (P<0.01),and those of CRE,ALT,GLO and TG were significantly different (P<0.05) between the female Californian and female Chinese rabbits.Conclusion The experimental results obtained in this study will be valuable reference for relevant clinical diagnosis and treatment,teaching Work and scientific researches in Tibet.

Objective To investigate the relationship among the leptin receptor(lepr) gene exon 20,nucleotide 3057 G→A transition and lipid metabolism,insulin sensitivity index,high blood coagulation in type2 diabetes mellitus.Methods Polymerase chain reaction(PCR) and restriction fragment length polymorphism(RFLP) were used to detect the variation of leptin receptor gene nucleotide 3057 G→A transition;Simultaneusly,we detected some parameters,including blood lipids,height,weight,blood glucose,waistline to hipline ratio(WHR).The body mass index(BMI),fat percent,insulin sensitivity index(ISI) were calculated out in all subjects.Results The variation frequency at 3057 nucleotide G→A transiton was 80% in type 2 diabetic group,though it was 68% in control group(P

Objective To discover the role of MCPH1 in DNA double-strand damage induced by ionizing radiation and its relationship with H2AX in esophageal cancer cell ECA109. Methods ECA109 cancer cells accepted 8 Gy 1 h after irradiation were collected for protein extraction and immunofluorescence then MCPH1 and H2AX protein expression and nuclear foci changes were observed. A stable low expression of H2AX cell lines was established and MCPH1 and H2AX protein expression and nuclear foci changes induced by ionizing radiation after silence H2AX were detected. Results (1)A stable low expression of H2AX cell lines in ECA109 cells was successfully constructed. (2)Ionizing radiation could cause the increase of r-H2AX and MCPH1 protein expression, as the same as nuclear focus increase of r-H2AX and MCPH1. (3)The protein level and nucleus focus of r-H2AX and MCPH1 were significantly reduced in ECA109 after silence H2AX. Conclusion MCPH1 is the part of DNA damage response triggered by ionizing radiation and is located in damage response downstream and can be regulated by H2AX.

The rats were assigned to blank control group, classical induction group, and drynaria total flavonoid group. Whole bone marrow culture method was applied to isolate and purify rats bone mesenchymal stem cells (BMSCs). Akaline phosphatase activity, calcium nodes, TGF-β1 and BMP-2 secretion in the process of bone mesenchymal stem cells osteogenic differentiation were detected. The results showed that compared to the blank group and classical group, drynaria total flavonoid promoted osteogenic differentiation accompanied with increased TGF-β1 and BMP-2 secretion (all P＜0. 05). Drynaria total flavonoid may promote osteogenic differentiation of BMSCs via upregulating TGF-β1 and BMP-2 expressions, and play an active role in the treatment of osteoporosis.

Objective To evaluate the left ventricular rotation and twist in the cardiac allograft by speckle tracking echocardiography.Methods Twenty-six heart transplant recipients underwent echocardiographic studies at 1st,3rd,6th and 12th month after heart transplantation.Twenty-six healthy subjects served as controls.Parasternal basal and apical short-axis images of left ventricle were recorded and then were analyzed using EchoPAC software.The curves of basal and apical rotation and left ventricular twist were obtained,Peak values of basal and apical rotation and left ventricular twist were measured and then statistically analyzed.Results There were no significant differences in left ventricular ejection fraction (LVEF) and fractional shortening (LVFS) between heart transplant recipients and controls (P ＞0.05).The left ventricular twist,apical rotation were significantly lower in heart transplant recipients at 1 st,3rd,6th and 12th month after surgery than those in controls (P ＜0.05) ;while basal rotation in heart transplant recipients had no significant difference when compared with controls (P ＞0.05).The left ventricular twist,apical and basal rotation in heart transplant recipients among 1 st,3rd,6th and 12th month after surgery had no significant difference (P ＞ 0.05).Conclusions Although the LVEF and LVFS of cardiac allograft seemed normal,the left ventricular twist,apical rotation were still significantly lower in heart transplant recipients than those in controls.Speckle tracking echocardiography can be used for accurate assessment of left ventricular twist in heart transplant recipients.

Objective To explore the effects of silencing H2AX gene on esophageal cancer ECA109 cell xenograft growth and sensitivity to radiotherapy in nude mice.Methods BALB/c nude mice models were established by subcutaneously inoculating differently treated ECA109 cells into nude mice.By random number table method 60 nude mice were divided into six groups,including blank group,irradiation group,negative group,negative with irradiation group,silence group and silence with irradiation group.The nude mice were irradiated with 15 Gy of 6 MV X-rays 21 d after inoculation.After irradiation 48 h,half of each mice group was terminated.The tumor specimens were processed by Western blot,RT-PCR and flow cytometry were used to detect the change in protein levels,RNA levels,and cell cycle.Results The tumor volume was (42.76 ±4.40) mm3 in silence group,significantly smaller than that of the blank group (73.18±8.80) mm3 and the negative group(71.27 ±8.40) mm3(F=67.8,P＜0.01).H2AX protein expression level in the silence group was also significantly lower (0.12 ±0.03 vs.1.12 ±0.11,1.16 ± 0.08,F =34.27,P ＜ 0.01).Relative H2AX mRNA expression level in the silence group was (0.85 ± 0.31),significantly lower than that of the blank group (1.86 ± 0.26) and the negative group (1.82 ±0.24,F =39.45,P ＜ 0.01).Co-immunoprecipitation assay showed that γ-H2AX and MDC1,53BP1 obvious interaction after irradiation,which would be weakened through silencing H2AX.The tumor volumes at different groups had significant difference after irradiation (F =13.56,P ＜ 0.01).The apoptosis rate in the silence group was significantly higher than that of the blank group and the negative group [(24.15±2.25) ％ vs.(13.26±1.54) ％,(12.78±1.47) ％ (F=54.33,P＜0.01)].G2/M phase arrested in the silence with irradiation group lower than that of the radiation group (F =10.21,P ＜ 0.01).Conclusions Silencing H2AX gene expression could inhibit the growth of esophageal cancer ECA109 cell xenograft and increase the radiosensitivity of tumor.

Objective To analyze the efficacy of chemoradiotherapy in the treatment of esophageal carcinoma and its influencing factors,and to provide an optimal combination mode of chemoradiotherapy for treating esophageal carcinoma. Methods A retrospective analysis was performed on clinical data from 232 patients with esophageal carcinoma who were admitted to our hospital from January 2006 to December 2012 and received radical chemoradiotherapy. All patients received three?dimensional conformal radiotherapy or intensity?modulated radiotherapy as well as platinum?based chemotherapy. The overall survival ( OS ) and local control ( LC) rates were calculated using the Kaplan?Meier method and analyzed using the Logrank test. Univariate and multivariate prognostic analyses were made by the log?rank test and the Cox proportional hazard model,respectively. Results In all patients,the 1?,3?,and 5?year LC rates were 66?1%,42?2%, and 38?5%,respectively;the median LC time was 24?4 months;the 1?,3?,and 5?year OS rates were 73?3%, 37?2%,and 19?5%,respectively;the median OS time was 21 months. The univariate analysis revealed that T stage,N stage,clinical stage,irradiation range,and no less than 3 cycles of chemotherapy were influencing factors for OS ( P=0?000,0?000,0?000,0?030,0?001) and LC ( P=0?112,0?031,0?009,0?074,0?218) . The multivariate analysis revealed that N stage,clinical stage,and no less than 3 cycles of chemotherapy were independent prognostic factors for OS ( P=0?006,0?000,0?001) . Conclusions The LC and long?term OS rates in patients with early?stage esophageal carcinoma can be substantially improved by radical chemoradiotherapy. The irradiation range and no less than 3 cycles of chemotherapy improve the long?term survival in patients.

Objective To prepare a novel ultrasound contrast agent , targeted phase-shift lipid nanoparticles mediated by tumor homing and penetrating peptide tLyP-1 ,and to evaluate its characteristics . Methods The nanoparticles were prepared by filming-rehydration and acoustic-vibration methods .The morphology ,distribution ,particle size and zeta potential were detected . After heating and irradiating of low intensity focused ultrasound ( LIFU) ,the phase-shift characteristic and the enhancement effect in vitro were observed . The tumor homing and cell-penetrating properties of the nanoparticles were examined by confocal laser scanning microscopy and flow cytometry . The cytotoxicity of the nanoparticles was evaluated by CCK 8 assay . Results The size and distribution of nanoparticles were uniformed . The size and zeta potential of nanoparticles were ( 399 .50 ± 29 .98) nm and ( 3 .28 ± 1 .72) mV ,respectively . When the nanoparticles were heated to a temperature of 45 ℃ or after irradiated by LIFU ,nanoparticles generated phase-shift and enhanced ultrasound imaging in vitro ( P < 0 .05 ) . The confocal laser scanning microscopy showed that nanoparticles mediated by tLyP-1 can targetedly aggregate to cell membrane of MDA-MB-231 and penetrate into the cell ,but not to HUVEC . The flow cytometry showed that intracellular fluorescence intensity of nanoparticles mediated by tLyP-1 in MDA-MB-231 group was higher than that in control groups ( P <0 .05) . The CCK8 assay indicated that different concentrations of nanoparticles had no significant effects on cell activity ( P > 0 .05 ) . Conclusions A novel ultrasound contrast agent , targeted phase-shift lipid nanoparticles mediated by tumor homing and penetrating peptide tLyP-1 ,is prepared successfully . It can target to MDA-MB-231 cell and penetrate into the cell in vitro ,and enhance ultrasound imaging in vitro after LIFU irradiation ,which expected to become a novel tumor targeted ultrasound contrast agent and achieve ultrasound molecular imaging at the level of tumor cell .

Objective To explore the value of the electronic colposcopy Reid Score in diagnosis of cervical lesions and HPV infection in women with HIV infection, so as to find out an inexpensive, convenient and feasible screening methods. Methods 95 cases of HIV-infected women were screened by cervical liquid based cytology, HPV testing, colposcopy and Reid Score. The patients with abnormal results in any one test mentioned above underwent cervical biopsy. The colposcopy was combined with pathological as a gold standard for case-control study. Results There was a statistically signi?cant correlation between colposcopic ndings and histopathological ndings and the score was increased as parallel as malignancy grade (r=0.753,P=0.00) . The specificity of Reid score for high grade CIN was better than high-risk HPV testing for CIN diagnosis and the sensitivity was better than liquid based cytology. Acetic acid staining has relatively high sensitivity and specificity in the diagnosis of cervical lesions. Conclusions Colposcope Reid score for cervical lesions has a predictive value, especially for high grade cervical precancerous lesions. Colposcopy for HIV-positive women cervical cancer screening is an efficient and feasible way, especially for the area where lack of medical resources.

Objective To evaluate left ventricular function in the way of intracavitary vortex by vector flow mapping(VFM),and to demonstrate the formation and variation of the vortex. Methods Twenty-six patients with dilated cardiomyopathy(DCM) and 44 healthy controls were involved. The velocity distribution imagings on the section plane of the flow in the left ventricle were obtained by VFM, the location of the vortex and its variation in every phase of cardiac cycle were focused,and series parameters were measured,such as the diameter of the vortex (transverse diameter, vertical diameter), number of the vertex. Results relaxation(e) period. Vortices were observed mostly during diastolic period, nearby the anterior leaflet of mitral valve,middle upper 1/3 of left ventricle,and their shapes changed 2 - 3 times. The diameters of the vortex (transverse diameter,vertical diameter) , number of the vertices in one cardiac cycle during 7 phases mostly nearby the cardiac apex, middle lower 2/3 of left ventricle, and their shapes changed 4 - 5 times.Compared with control group,the diameters of the vortex (transverse diameter, vertical diameter) during 7 phases in DCM group were bigger,and number of the vertices were more ( P ＜0.01 ). The diameters of the vortex (transverse diameter, vertical diameter), number of the vertices within DCM group in one cardiac cycle during 7 phases were significantly different ( P ＜ 0.01 ). Conclusions VFM can demonstrate the variation of intracavitary vortex. Vortex in DCM group were significantly bigger than those of control group.