Objective To observe the histopathological features of early skin lesions and serum inflammatory mediators changes in the diabetes mellitus(DM) rats.Methods A total of 50 Wistar rats at 8 to 10 weeks of age were divided into normal control group(C group,n=25) and diabetic group(DC group,n=25).The rats of DC group were given a high-glucose and high-fat diet for 2 weeks to induce insulin resistance and then an intraperitoneal injection of 35 mg/kg streptozotocin.All 25 rats were identified to be diabetic models with their fasting blood glucose over ≥7.0 mmol/L.Four rats of C group or DC group were killed to take the skin tissues in the 4th,8th and 12th weekend.In the 16th week,the heart blood samples of the left 13 rats of C group and 10 rats of DC group were collected to measure TNF-?,IL-6 and C-RP levels,and the skin samples were also taken for pathological observation and full-thickness and dermal thickness measurement.Results In the 16th week,the TNF-?,IL-6 and C-RP levels of DC group were significantly higher than the normal group(P

Objective To investigate the effects of rosiglitazone on serum levels of tumor necrosis factor-? (TNF-?),interleukin-6 (IL-6),C-reactive protein (C-RP) and superoxide dismutase (SOD),and early skin changes in the diabetic rats.Methods The rats were divided into normal control group (C group,n=13),diabetic control group (DC group,n=13),diabetes and insulin treatment group (DI group,n=13),diabetes and rosiglitazone treatment group (DR group,n=13).The diabetic rat models were established with high-fat diet for 2 weeks followed by intraperitoneal injection of 35 mg/kg streptozotocin injection,the rats were idenfied as diabetic when their fasting blood glucose (FBG) over 7.0 mmol/L.The living rats were given corresponding treatment,subcutaneous injection of 1 to 2 U/d insulin,intragastric injection of 5 mg/(kg?d) rosiglitazone,or sterile water.Heart blood samples of rats from each group were collected to measure TNF-?,IL-6,C-RP and SOD levels in the 16th weekend.Also the skin was taken for pathological observation and full-thickness as well as dermal thickness measurements.Results The serum levels of IL-6,TNF-? and C-RP in diabetic group were significantly higher than those in normal group (P

Objective To investigate the role of Gly82Ser polymorphism of receptor for advanced glycation end-products (RAGE) in the genesis and progression of colon cancer in Chinese population.Methods Using the method of PCR-restriction fragment length polymorphism (PCR-RFLP),the Gly82Ser genotype of RAGE were examined in 90 colon cancer patients and 78 control subjects age and sex matched.Analyses stratified by TNM and tumor differentiation were conducted to check the associations of the Gly82Ser gene polymorphisms in RAGE and development of colon cancer.Results The genotype distribution was in agreement with that predicted under Hardy-Weinberg equilibrium for both patients and controls (both P ＞ 0.05).With the GG genotype as reference,the odds ratio (OR) for heterozygous GG and carriers with S allele (GS and SS) were 2.037 (95％ CI:1.207-3.438) and 2.022 (95％ CI:1.275-3.208),respectively,which had a significantly higher risk of colon cancer.Moreover,the elevated colon cancer risk was especially evident in patients with TNM (Ⅲ + Ⅳ) and/or patients with poor differentiation by stratification analysis (OR,3.575,95％ CI:1.495-8.550 and OR,3.580,95％ CI:1.390-9.217,respectively).Conclusions The RAGE Gly82Ser polymorphism may confer not only an increased risk of colon cancer but also with invasion of colon cancer in the Chinese population.

Objective To study the protective effects of rosiglitazone against early skin changes in experimental diabetic rats. Methods Diabetic models were established in male Wistar rats aged 8 to 10 weeks by using streptozotocin (STZ). Then, 39 experimental diabetic rats were equally divided into insulin-treated diabetic group (DI group), rosiglitazone-treated diabetic group (DR group), diabetic control group (DC group),and 13 normal rats served as the control (C group). The rats were given subcutaneous insulin (1 - 2 U) twice daily in DI group, intragastric rosiglitazone (5 mg/kg) once daily in DR group, and intragastric sterile water in DC and C groups. Sixteen weeks later, heart blood samples were collected from all the rats for the measurement of tumor necrosis factor (TNF)-α, interleukin (IL)-6, C reactive protein (CRP), superoxide dismutase (SOD) and P substance (SP) levels, then the rats were killed and tissue samples were obtained from the medial area of the dorsal skin and subjected to pathological observation, measurements of skin as well as dermal thickness, and immunohistochemical examinations for the expression of advanced glycation end products(AGEs) and peroxisome proliferator activated receptor-γ (PPAR-γ). Results The levels of IL-6, TNF-α and CRP in the DC group were significantly higher than those in the C group (135.05 ± 43.39 ng/L vs. 99.92 ±32.36 ng/L, 1.45 ± 0.67 μg/L vs. 0.86 ± 0.60 pg/L, 3.51 ± 0.62 mg/L vs. 2.54 ± 1.31 mg/L, all P < 0.05),while no significant difference was found between C group and DI group or DR group (all P> 0.05). Decreased levels of SOD and SP were noted in the DC group (70.71 ± 37.52 U/ml, 22.22 ± 7.93 ng/L), compared withthe C group (137.76 ± 27.6 U/mL, 29.57 ± 3.74 ng/L, both P< 0.01), DI group (149.96 ± 13.25 U/mL, P<0.01; 29.79 ± 5.21 ng/L, P< 0.05) and DR group (128.50 ± 38.27 U/mL, P< 0.01; 33.35 ± 15.0 ng/L, P<0.05 ). Micrometer measurements indicated that the skin thickness was significantly lower in the DC group than in the C group, DI group and DR group (0.77 ± 0.18 mm vs. 1.59 ± 0.26 mm, 1.47 ± 0.50 mm and 1.22 ±0.47 mm, P < 0.01, 0.01, 0.05 respectively). Histological observation found a mild disarrangement of epidermal cells, shrinkage, swelling and degeneration of dermal collagen as well as progressive atrophy or disappearance of subcutaneous fat in the DC group. No obvious histological changes appeared in the DI or DR group. Immunohistochemistry indicated that AGEs and PPAR-γ proteins, which were stained into brown granules, were located in the vascular basement membrane, stromal cells, etc, of skin. The DC group showed the highest expression of AGEs but lowest expression of PPAR-γ. Conclusions There is an accumulation of AGEs and elevated expressions of inflammatory factors in the skin of experimental diabetic rats, and rosigLItazone shows a protective effect against the early skin changes.

Dynamic fluorescence molecular imaging is a kind of technique that can capture the dynamic physiology and pathology process in vivo by imaging the whole progress of absorption,distribution and elimination of fluorescence molecular probes in small animals.It has the advantages of non-ionizing radiation,fast imaging,high sensitivity and specificity,low cost,and has broad application prospects in basic and clinic medical research.This paper reviews the research progress in dynamic fluorescence molecular imaging from three aspects including system,algorithm and application.

Objective To assess the accuracy and precision of γ-spectrometry analysis, and to obtain accurate and valid measurement results in the middle term and long term. Methods A nationwide intercomparison on gamma-ray spectrometry measurement of activity concentration of 226Ra, 232Th and 40K in soil and building material was organized by National Institute for Radiological Protection( NIRP) , China CDC. Results 15 laboratories participated in this intercomparison, with 13 laboratories produced acceptable results. Only 2 laboratories were classified as " not acceptable" , including one for inappropriate accuracy in determination of 40K and another for inappropriate precision determination of 226Ra in both kinds of the samples. Through comment and discussion, the second round intercomparison got satisfactory results. Conclusions The overall measurement results of samples for intercomparison are in close agreement with the reference values. Most of the laboratories involved in the intercomparison have good ability in γ-spectrometry analysis.

Objective To measure and analyze the radioactivity level of 210Pb in outdoor air in Beijing in spring.Methods Portable high flow air samplers were used to collect outdoor air at the ground level to analyze the 210Pb radioactivity in the aerosol filter samples using a laboratory-based high purity germanium (HPGe) γ spectrometer.Results The activity concentration of 210Pb outdoors ranged from 267.2 to 1 697.6 μBq/m3,with an average of (878.7 ± 386.7) μBq/m3.Statistical analysis showed that the activity concentrations 210Pb of outdoors varied with variable air quality.Conclusions The activity concentrations of 210Pb outdoors are detectable in Beijing,varying considerably but within the normal range.

ObjectiveTo assess the value of the area of ground glass opacities (GGOs) in lungs displayed by high-resolution computed tomography (HRCT) in paraquat (PQ) poisoned patients in evaluating prognosis. Methods Clinical and imaging data of 137 patients with acute PQ poisoning admitted to Affiliated Hospital of the Medical College of Chinese People's Armed Police Forces from January 2012 to August 2014 were analyzed retrospectively. The plasma concentration of PQ on admission and the area of GGOs were compared between two groups. The lung HRCT within 10 days of poisoning was performed every 3 days, and the areas of GGOs were evaluated on five levels, including aortic arch, aortic pulmonary window, left upper lobe bronchial, right inferior pulmonary vein, and left diaphragmatic dome. Receiver operating characteristic curve (ROC) was plotted to evaluate the value of all the parameters for prognosis.Results Among 137 patients, 45 died within 28 days after poisoning, with the mortality rate of 32.85%. The plasma PQ level in the non-survivors was significantly higher than that in the survivors (mg/L:7.06±0.67 vs. 3.51±0.34,t = 5.280,P = 0.000). The areas of GGOs at three time points in the non-survivors were significantly higher than those in the survivors [1-3 days: (32.0±5.0)% vs. (2.5±0.4)%,t = 7.860,P = 0.000;4-6 days: (45.5±5.7)% vs. (2.8±0.5)%,t = 12.420,P = 0.000; 7-10 days: (68.0±4.8)% vs. (3.0±0.6)%, t = 23.950,P = 0.000]. ROC analysis demonstrated that the area under the ROC curve (AUC) of GGOs in 7-10 days was 1.000, which could be used to determine the prognosis, but it was too late for the treatment. The AUC of GGOs in 4-6 days was 0.979, with the threshold of> 12.0%, the specificity of 96.15%, the sensitivity of 85.19%, the positive predictive value of 88.46%, and the negative predictive value of 94.94%, which presented good effect in predicting prognosis in the early stage of acute PQ intoxication. But plasma PQ concentration was relatively poor for determining prognosis, AUC was 0.821, with the threshold of> 1.95 mg/L, the specificity of 34.52%, the sensitivity of 88.64%, the positive predictive value of 41.49%, and the negative predictive value of 85.29%.Conclusions The area of GGOs displayed by HRCT can be used to evaluate the fully developed acute PQ lung injury, and it is superior to plasma PQ concentration. The area of GGOs displayed by HRCT 4-6 days after intoxication can be used for the evaluation of PQ induced pulmonary injury in the early stage and the evaluation of clinical prognosis.

Objective To investigate the effect of insulin-like growth factor-1(IGF-1) and basic fibroblast growth factor (bFGF) on the differentiation of human dental pulp stem cells in vitro. Methods Mono-cell suspension was separated from the human adult dental pulp with collagenase Ⅰ and dispase digestion. Colony-forming efficiency of cells was calculated. Cells were observed under an invert microscope. Dentin sialoprotein (DSP), dentin matrix protein 1 (DMP-1) and dentin sialophosphoprotein (DSPP) mRNA of the 3rd passage cells induced with IGF-1 and bFGF in vitro were detected by immunohistochemistry and RT-PCR. Results Clonogenic cells were obtained from dental pulp and colony-forming efficiency of cells was 2.6-3.5 colonies/10 4 cells. Human specific DSP, DMP-1 protein and DSPP mRNA expressed in colony-forming cells after 7 d of induction with IGF-1 and bFGF in vitro. Conclusion Adult stem cells might exist in human dental pulp. Dental pulp stem cells could differentiate into odontoblast under the induction of IGF-1 and bFGF.

Objective To investigate the effective MRI sequences and describe the correlation between MRI and visual evoked potential(VEP)in diagnosing optic neuritis.Methods One hundred and fifty-four eyes with visual impairment of 98 patients with diagnoses of optic neuritis,papillitis,multiple sclerosis and Devic's disease underwent MRI and VEP examination. The MRI findings were analyzed and correlated with VEP results and clinical presentation by using x2 test,wilcoxon test and Kappa test.Results Out of the 154 sick eyes.56 eyes presented thickened optic nerves.76 eyes had normal diameter of the optic nerve,and 22 eyes had thin optic nerves.A total of 132 optic nerves showed abnormally high signal in STIR sequences.including involvement of intraocular segment in 7,intraorbitsl segment in 135,intracanalicular segment in 109,intracranial segment in 97,optic chiasm in 56,and optic tract in 23.A total of 54 patients underwent postcontrast MRI. Seventy-four optic nerves of 87 eyes showed enhancement.Among the 196 eyes of 98 patients,132 eyes presented visual impairment and simultaneous abnormal MR signal of the optic nerve.and 26 eyes had both normal vision and normal MR signal of optic nerve.The consistency of MRI findings and vision status was 80.61%(Kappa=0.453,P＜0.01).Among the 175 eyes with VEP results.129 eyes had visual loss with simultaneous VEP abnormalities,and 30 eyes had both normal vision and normal VEP results.The consistency of VEP and vision status was 90.86%(Kappa=0.731,P＜0.01).Among the 175 eyes with VEP results,117 eyes had abnormal MR signal of the optic nerve and simultaneous abnormal VEP,and 24 eyes had both normal MR signal of the optic nerve and normal VEP.The consistency of MRI findings and VEP was 80.57%(Kappa=0.460,P＜0.01).Conclusion STIR sequence and gadolinium-enhanced T1-weighted MR sequence combined with fatsuppression are helpful in diagnosis of optic neuritis.VEP is helpful in diagnosing optic neuritis and in finding subclinical visual problem.The MRI combined with VEP could improve the diagnostic accuracy of optic neuritis.