Objective To study the changes of colonic motility in chronic stress-induced depression rat model,the association between interleukin 6 (IL-6) and depression and its effects on contraction of colonic smooth muscle in vitro.MethodsThere were 30 healthy adult Wistar rats,of which chronic stress-induced depression model was created in 15 rats and the other 15 rats were in control group.The ratio of sugar consumption to body weight and the percentage of sugar preference were tested in these two rats groups through sugar preference experiments.The behavioral changes of two rats groups were detected by open field test.Colonic motility was evaluated with simulated fecal discharge experiment,and the serum IL-6 level was measured with enzyme linked immunosorbent assay (ELISA).IL-6 in colon tissue at mRNA level was determined by RT-PCR.The contraction ability of rat colonic smooth muscle was observed.The colonic smooth muscle of control group was treated with different concentration of IL-6,the effects of IL-6 on normal colonic smooth muscle and its response to acetylcholine (Ach) were evaluated.Results In model group,the ratio of sugar consumption to body weight was 0.12±0.03,the percentage of sugar preference was 16.17％ ±2.61 ％,total walking distance was (741.54 ± 341.10) cm and total times of upright was 15.69 ± 8.00,which were all significantly lower than those of control group (0.18±0.02,25.54 ％ ± 2.32 ％,1336.20 cm±698.80 cm and 24.87±7.90,respectively) (P=0.041,0.044,0.002 and 0.001).It took (109.78±48.00) min for defecating in model group,which was significantly longer than that of control group (28.00±11.10) min (P=0.002).The IL-6 levels were high both in the serum and colon tissue of model group rats.The response of colonic smooth muscle to Ach was weaker in model group than that of control group (P=0.035).In model group,there were no significant difference in the response of colonic smooth muscle to IL-6 at 200,500 and 1000 pg/ml (P =0.935、0.825、0.766 ).After Ach added,there was significant difference in the response to Ach between IL-6 at 500,1000 pg/ml (R=1.1480±0.1000 and 1.1361±0.1500) and control group only added with Ach (R=1.6100±0.4500) (P=0.000 and 0.004).ConclusionIL-6 level increase in chronic stress-induced depression rat model and causes smooth muscle contraction disorder through reducing the sensitivity of intestinal smooth muscle to Ach.

Objective To analyze the colonization of Candida, Rhodotorula, Penicillium and Aspergillus in skin surfaces of patients with atopic dermatitis, and to assess the relationship between the four common fungal allergens and severity of atopic dermatitis. Methods Fifty patients with atopic dermatitis and 20 healthy controls were enrolled. Scales were scraped from lesional and non?lesional skin of flexural extremities of the patients, as well as from normal skin of the flexural elbow of healthy controls, then were subjected to microscopic examination and culture. Scale specimens were inoculated onto Sabouraud dextrose agar medium and cultured at 25 ℃ in a constant temperature incubator. Subsequently, suspected fungal or yeast?like colonies were collected for pure culture. Finally, fungal strains were identified according to colony morphology, color, growth speed, as well as microscopic features of spores and hyphae. Results No hyphae or pseudohyphae were found in any case by microscopic examination. Candida albicans and Rhodotorula were detected in 29(58%)and 17(34%)out of the 50 patients, respectively, and in 5(25%)and 2 (10%) out of the 20 healthy controls, respectively. The detection rates of Candida albicans and Rhodotorula were significantly higher in the patients than in the controls(χ2=6.23, 4.10, respectively, both P<0.05). Of 25 patients with severe lesions, 19(76%)and 12(48%)were colonized by Candida albicans and Rhodotorula respectively;among 25 patients with moderate lesions, 10 (40%) and 5 (20%) were colonized by Candida albicans and Rhodotorula respectively. An increase was observed in the detection rates of Candida albicans and Rhodotorula in the patients with severe lesions compared with those with moderate lesions(χ2=6.65, 4.37, respectively, both P<0.05). There was no significant difference in the detection rate of Penicillium or Aspergillus between the patients and health controls. Conclusion The colonization rates of Candida albicans and Rhodotorula on skin surfaces were higher in patients with atopic dermatitis than in healthy controls, and higher in patients with severe lesions than in patients with moderate lesions, indicating that the types of colonizing fungi are associated with the health status of skin and severity of symptoms in patients with atopic dermatitis.

Objective To investigate the expression of histamine in the cardiac sympathetic fibers from the guinea pig superior cervical ganglion and its coexistence with norepinephrine so as to provide morphological evidence for histamine as a cardiac sympathetic neurotransmitter.Methods Biotinylated dextranamine(BDA) anterograde tracing and immunofluorescence histochemical staining for histamine/norepinephrine were applied.Results After injection of BDA into the superior cervical ganglion,BDA labeled sympathetic fibers in the left and right atria and ventricle were observed.Meanwhile,the tracing fibers proved histamine-like immunoreactive or both histamine and norepinephrine-like immunoreactive.Conclusion Histamine is expressed in the cardiac sympathetic fibers from the guinea pig superior cervical ganglion and coexisted with norepinephrine.

A tumor-targeting recombinant fusion immunotoxin B-L-SEC2 was constructed by fusing staphylococcal enterotoxin C2 (SEC2) and an anti-HER-2 single-chain Fv B1 through a peptide linker, and expressed in E. coli strain BL21 (DE3) with an improved expression vector pASK75-EX as inclusion body. The denatured inclusion body was purified with Ni-NTA chelate agarose, and then re-natured by dialysis. FACS and MTT assays indicated that the re-natured fusion immunotoxin B-L-SEC2 could target the HER-2 over-expressing breast tumor cell SK-Br-3 in vitro, and inhibit the growth of SK-Br-3.

Positron emission tomography (PET) has become basic support equipment in clinical and many other scientific research fields and has been a hot research field at present. Tomography reconstruction algorithm is a key component of PET, and most PETs use statistical iterative reconstruction algorithms from sinograms data currently. However, tomography reconstruction from list-mode data possesses many unique advantages, and it has caused great attention and is in the process of rapid development and improvementin recently. We eventually achieved list-mode tomography reconstruction in this paper, using experimental data of small animal PET scanner Eplus-166, exploiting S-LMEM algorithm and orthogonal distance-based ray-tracer. The results demonstrated that image resolution and contrast recovery achieved inherent properties of the scanner and on-the-fly ray-tracing methods is feasible for dynamic reconstruction.
Algorithms ; Humans ; Image Processing, Computer-Assisted ; Imaging, Three-Dimensional ; methods ; Models, Theoretical ; Positron-Emission Tomography ; methods

Objective To investigate the role of Zn 2+and Zn2+-coordinating glutamic acid residues ( 71Glu and 80Glu ) in the superantigenic activities of staphylococcal enterotoxin C2 ( SEC2 ) .Methods Over-lap PCR was used to amply genes encoding recombinant mutant proteins rSEC 2 ( E71A), rSEC2 (E80A) and rSEC2 (E71A/E80A).The mutant proteins were expressed in E.coli BL21 (DE3) and puri-fied by affinity chromatography .The differences of biological activities between rSEC 2 and its mutants were compared in vitro.The effects of Zn 2+on the superantigenic activities of rSEC 2 were evaluated by analyzing the proliferation of splenic lymphocytes in the presence or absence of ethylenediaminetetraacetic acid ( EDTA) .Results The substitution of glutamic acid residue at position 71 and 80 by alanine residue had no significant effects on the superantigenic activities and the conformational stability of rSEC 2 mutants.How-ever, traces of Zn2+(10μmol/L) could significantly enhance rSEC2-induced proliferation of splenic lympho-cytes, and only certain amount of Zn 2+could completely restore rSEC2-induced proliferation in the presence of EDTA.Conclusion This study indicated that mutations at Zn 2+-coordinating glutamic acid residues had no significant effects on the conformational stability and the superantigenic activities of SEC 2.Zn2+might play a role in regulating the superantigenic activities of SEC 2 through some indirect ways .

Objective:To investigate the improved superantigen activity of SEC2(T20L/G22E) compared with recombinant staphylococcal enterotoxins C 2 ( rSEC2 ).Methods: The proliferation of spleen lymphocytes and T-cell subpopulations induced by rSEC2 and SEC2(T20L/G22E) were examined by WST-1 and flow cytometry separately,and the gene expression of cytokines and Vβspecificities were quantified by real-time PCR.Results: WST-1 and Flow cytometry assays showed that the superantigen activity of SEC2(T20L/G22E) was improved due to enhanced T-cell stimulating potency,resulting in massive activation of T-cells,particularly CD4+and CD8+T-cells.Quantitative real-time PCR assay showed that despite similar Vβspecificities induced by rSEC 2 and SEC2 (T20L/G22E),the quantities of activated T-cells bearing specific Vβwere different,and SEC2(T20L/G22E) could stimulate more gene expression of associated cytokines simultaneously.Conclusion: The results strongly suggested that the increased SEC 2 ( T20L/G22 E)-TCR-binding affinity contributed to more T-cells activation and cytokine release ,which elicit powerful immune activition.

Objective:To explore the application value of case three-dimensional teaching method combined with standardized patient (CTTM+SP) in the clinical clerkship teaching reform of gastrointestinal surgery.Methods:A total of 120 students of clinical medicine having clerkship in Binzhou Medical University Hospital were recruited in this study, and they were randomized to the experimental group and the control group, with 60 students in each group. The experimental group took the CTTM+SP teaching method, and the control group adopted the lecture-based learning teaching method. The comprehensive ability of the two groups was evaluated by department graduation examination and satisfaction survey.Results:The examination performance and the satisfaction rate of students in the experimental group were significantly higher than those of the control group ( P < 0.05). Conclusion:CTTM+SP teaching method is helpful for the probationers to master the theoretical knowledge of gastrointestinal surgery systematically, improve the clinical thinking ability and the ability to solve practical problems, mobilize the students' learning motivation and interest, and improve the teaching effect of gastrointestinal surgery clinical clerkship.

Objective To investigate the effects of different tidal volume ventilation on acute lung injury in rats. Methods Thlrty-two normal Wistar rats were randomly divided into four groups:control group,low tidal volume group(L- V_T),conventional tidal volume group(C-V_T)and high tidal volume group(H-V_T).The pathologic changes of the lungs were observed under macrography,light and electron microscope.The blood gas analysis(PaO_2),the counts of neutrophils (PMN),the levels of protein and the myloperoxidase(MPO)activities in bronchoalveolar lavage fluid(BALF)were measured by biochemical methods respectively.Results There were no distinct pathological differences between L-V_T group and control group under macrography,light and electron microscope.In the C-V_T and H-V_T groups,there were different degree of lung injuries under light and electron microscope,their PMN,MPO activity and protein level in BALF were significantly higher than those of control and L-V_T groups and their PaO_2 were significantly lower than those of control and L- V_T groups(P＜0.01,P＜0.05).The MPO activity and the protein level in BALF were also significantly higher than those of C-VT group(P＜0.01)Of the above indexes,there were no statistical differences between L-V_T group and control group(P＞0.05).Conclusion Conventional tidal volume ventilation alone,without any lung-protective strategy, could produce injuries to the normal lung tissues,while low tidal volume ventilation hadn't effects on them.The injury effects produced by mechanical ventilation was closely related to the recruitment and activation of neutrephils in the lung.

Objective:To evaluate the effect of remote ischemic conditioning (RIC) on left ventricular (LV) myocardial perfusion, myocardial viability, LV remodeling, regional and global LV function serially following acute myocardial infarction (AMI) in Chinese mini-pigs.Methods:AMI was established in 12 Chinese mini-pigs (8 males, 4 females; age: 6-8 months) and they were randomly divided into RIC group ( n=6) and non-RIC group ( n=6). RIC was performed in pigs by blood pressure inflation on the lower limbs for 5 min period and 4 cycles immediately after surgery. A series of myocardial perfusion imaging and gated 18F-fluorodeoxyglucose (FDG) myocardial metabolism PET/CT imaging were performed longitudinally at the 1st, 14th, 28th and 56th days after AMI, and parameters including total perfusion defect (TPD), hibernating myocardium (HM), Scar, left ventricular ejection fraction (LVEF), left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV), summed motion score (SMS), summed thickening score (STS) and changes of these parameters were obtained. Independent-samples t test and Mann-Whitney U test were used to analyze data. Results:Nine Chinese mini-pigs survived after surgery and were performed imaging. Compared to non-RIC group ( n=4), HM at the 28th ((6.0±2.4)% vs (17.0±4.6)%; t=-4.158), TPD 14th-1st ((-11.8±5.4)% vs 9.0%(4.5%, 15.0%); z=2.449), TPD 28th-1st ((-15.3±3.9)% vs (12.0±3.0)%; t=-10.071), TPD 56th-1st ((-18.0±6.5)% vs 9.0%(4.5%, 12.0%); z=2.449), HM 28th-1st ((-10.5±6.9)% vs (8.3±2.1)%; t=-4.507), HM 56th-1st (-15.0%(-17.5%, -8.5%) vs 2.0%(0%, 7.0%); z=2.449) and LVEDV 14th-1st (-0.5(-2.5, 0) ml vs (13.0±4.4) ml; z=2.470) were reduced in RIC group ( n=5; all P<0.05). Conclusion:RIC can improve myocardial perfusion, delay LV remodeling in the acute stage and salvage hibernating myocardium in the subacute stage and chronic stage.