Objective To investigate the effects of motilin on the voltage dependent potassium channel and L-type calcium channel currents in rat proximal colon smooth muscle cells (PCSM) and to explore its mechanism in increasing colonic motility.Methods PCSM were isolated by collagenase.The voltage dependent potassium channel transit outward current (IKA ) and delayed rectifier current (IKdr) and L-type calcium currents (ICa(L)) were measured by whole cell patch clamp technique.Groups were analyzed by paired t-test.Results There was no significant effect of motilin on IKA and IKdr.L-type calcium channel was dose-dependently activated by motilin from 0.5 × 105 mmol/L to 10.0 ×10-5 mmol/L.At 6 × 10-5 mmol/L motilin and under - 10,0 and 10 mV stimulating voltage,maximum current density increased by 154.61％,62.69％ and 21.02％ respectively and activation kinetics curve obviously left shifted.Half activation voltage decreased from (2.740±1.211) mV prior administration to ( - 25.290 ± 0.614) mV (t =8.534,P =0.007 ) and there was no significant difference in slope factor. Conclusions Motilin increases colonic smooth muscle contraction by promoting calcium influx. However the frequency of colonic smooth muscle contraction could not change with frequency of equilibrium potential and action potential of colonic smooth muscle.

Objective To study the differences of chromosomal structure among Yersinia pestis strains isolated from China,and to investigate the reasons of chromosomal rearrangement events occurred in Yersinia pestis as well as the possibility of strain identification and phylogenetic analysis based on the chromosomal rearrangement features.Methods According to the genome sequence data downloaded from web of National Center for Biotechnology Information (http://www.ncbi.nlm.nih.gov/genome),alignment of all the coding sequences (CDSs) among five strains(American strain CO92 as reference and other four completely sequenced strains from Inner Mongolia,Jianchuan of Yunnan,Yulong of Yunnan,Naqu of Tibet in China named 91001,D182038,D106004 and Z176003 as comparison strains) was performed,and then the chromosome of Yersinia pestis was divided into several large DNA segments (named chromosomal plate in the text) according to the similarity of CDSs.Plate arrangement patterns in each strain' s chromosome and gene content of breakpoint regions were determined.Finally,genetic relationships among Yersinia pestis strains were analyzed on the basis of rearrangement diversity from paired-comparison.Results Yersinia pestis chromosomes of strains CO92,D182038,D106004,91001 were composed of 44 relatively independent plates,except strain Z176003.Gene order was very stable within each plate,while it was movable between the plates.Comparing with the reference strain CO92,13 rearrangement events occurred in the chromosomes of both strain D182038 and strain D106004,and 14 rearrangement events involved in Z176003,while 37 rearrangement events occurred in 91001.Paired-comparison data showed that only 8 plates order differences were existed between D106004 and Z176003.Forty-three breakpoint regions were identified on the chromosome of strain CO92,and 39 of them contained insertion sequences,and 25 of them were IS100.Conclusions Yersinia pestis genome represents a high degree of genetic flux,and chromosomal structures of strains are significantly different from each other.Chromosomal rearrangement events is closely related to the large number of insertion sequences in the Yersinia pestis chromosome.Rearrangement diversity among Yersinia pestis strains could reflect their genetic relationships.

Objective To investigate the localization,zone and activation intensity of olfactory center in young versus elderly healthy volunteers by functional magnetic resonance imaging (BOLD-fMRI),so as to elucidate the effect of age on olfactory center in healthy population.Methods Thirteen right-handed healthy adult volunteers were recruited and divided into two groups:young group (5 males and 3 females,mean aged 23 years) and elderly group (2 males and 3 females,mean aged 69.2 years).The olfactory stimulus was r-undecalactone,and it was given according to a block design.The fMRI detection was performed on Philips Achieva 3.0 T MR scanner,and data of BOLE-fMRI was processed and analyzed to get cerebration image by using SPM2.Results In groupaveraged maps,both young and elderly group showed significant olfactory activation in right parahippocampal gyrus,left hippocampal sulcus,right and left superior temporal gyrus,etc,subcortical activation in right thalamus,dorsal pons,and cerebellum activation in cerebellar vermis.Activations in right inferior frontal gyrus,right middle frontal gyrus,right medial occipito-temporal gyrus and right fimbria of hippocampus were observed only in young group,while activation in bilateral middle temporal gyrus was observed only in elderly group.Activation area was apparently smaller and activation degree was lower in elderly group than in young group.Activation intensity in right superior parietal lobule and bilateral superior temporal gyri was higher in male group than in female group (t=13.7,6.08,5.36,respectively,all P＜0.001).Conclusions The intensity of activation in olfactory center is lower in the elderly than in the young,and absence of part of the active regions is found in the elderly,which demonstrates the regression of olfactory center in the elderly.The olfactory center shows right-predominant activation,and olfactory activation intensity in some cortical regions is higher in males than in females.

Composition of the polysaccharide from Bupleurum scorzonerifolium Willd. was studiedby high resolution capillary gas chromatography after hydrolysis and followed by acetylation and esterifica-tion of the hydrolysate. The results showed that it is composed of arabinose, ribose, D-xylose, D-man-nose, D-glucose and D-galactose, with a molar ratio of 0. 106 : 2. 652 : 4. 070: 0. 519 : 0. 930 : 2. 518.

Objective To explore the clinical application of ultrasonography on tethered spinal cord syndrome (TCS).Methods Ultrasonic feature of 45 patients with TCS were analyzed retrospectively. Pre-and post-operative blood flow rates of cone were recorded by color doppler.Results Ultrasound was the same as computer tomography not only presented the image of anatomy and pathology of TCS,but also showed the lack of pulsatile motion of distal cord with TCS.Before the operation,blood flow rates of cone were( 0.047?0.012) m/s.After the operation,blood flow rates of cone were(0.158?0.029) m/s.There was significantly different(P

Background The incidence of posterior capsular opacification (PCO) is increasing with the growing of cataract surgery rate.Recent researches provend that disintegrin has inhibitory effect on PCO,and echistatin is one of the disintegrin prime families.Objective This study was to investigate the effects of disintegrin and echistatin on proliferation,adhestion and migration in human lens epithelial cells (LECs) line (SRA01/04).Methods Human LECs line at logarithmic growth phase was used in the study.Cells were cocultured with medium and different concentrations of echistatin (0,2.5,5.0,7.5,10.0,15.0,20.0 mg/L) for different time.The proliferative inhibitory rates of LECs were detected by MTT method 24,48 and 72 hours after cultured.Anti-adhesion effect of echistatin were analyzed by the same assay in 90 minutes.Cell scratching test was performed to evaluate the migration ability of LECs.The width of the scratch was recorded in the culture plate covered with cells under an inverted microscope.After being cultured for 24 hours and 48 hours with echistatin,cell migration distances was examined.Results Compared with the 0 mg/L echistatin group,cells proliferation was obviously inhibited.After cultured with 2.5,5.0,7.5,10.0,15.0,20.0 mg/L echistatin,the proliferation inhibitory rate was 2.6％,15.4％,21.2％,34.7％,46.1％,58.2％ at 24 hours;6.6％,21.9％,38.2％,50.0％,60.7％,76.9％ at 48 hours and 9.8％,29.0％,46.6％,63.4％,69.1％,92.4％ at 72 hours,respectively.The absorbance value (A) in the 5.0,7.5,10.0,15.0,20.0 mg/L groups were significantly lower than that in the 0 mg/L group (P＜ 0.05).With the prolongation of acting time of Ecs,the A value of the cells was gradually reduced,with statistically significant difference (P＜0.05).The adhesion inhibitory rate was 2.6％,15.0％,26.1％,35.3％,45.2％ and 54.5％ in the 2.5,5.0,7.5,10.0,15.0,20.0 mg/L group,respectively.Compared with the result in the 0 mg/L group,the A value in the 5.0,7.5,10.0,15.0,20.0 mg/L group was statistically significant (P＜0.05).After cultured for 24 hours and 48 hours,cell migration distance shortened in the 5.0,7.5,10.0,15.0,20.0 mg/L group,showing a statistically significant difference among them (P＜0.05).Cell migration distance was gradually shortened with the lapse of action time of Ecs with the significant difference (P ＜ 0.05).Conclusions echistatin has inhibitory effects on proliferation,adhestion and migration for human LECs in vitro in time-and dose-dependent manner.It is inferred that echistatin may play a role in the prevention and treatment of PCO.

By non-steady method,the effective diffusivity of ferrous sulphate within alginate calcium gel entrapped without bacteria was measured.Meanwhile the oxidation ability of entrapped bacteria was analyzed.Experimental results showed that the effective diffusion coefficient of ferrous sulphate decreased with the increase of alginate concentration,the optimum alginate concentration is 2%(W/V).The effect of calcium chloride on the effective diffusivity was neglectable.The incubation of ferrooxidans would pass through 10 hours,and the diffusion coefficient within gel entrapped Thiobacillus ferrooxidans cells was less remarkably than that of ferrous sulphate without entrapped cells.For the entrapped cells,the absolute oxidation time was shortest and the rate change was fastest with the initial Fe concentration 5g/L.The absolute oxidation time was same when the initial Fe concentration was 8g/L and 10g/L.

The skin ulceration syndrome of sea cucumber is a kind of desease induced by bacterium.In order to investigate the bacterium of infected sea cucumber and detect the N-acyl-homoserine lactones(AHLs) se-cretion of the bacterium,7 bacterial strains were isolated from the infected sea cucumber.These strains were identified by physiological-biochemical characteristics and 16S rDNA sequence.Results show that strain C6 belongs to Tenacibaculum,strain 4 belongs to Shewanella putrefaciens group,strain TB belongs to Vibrio,strain BP2,BP3,BP4 and BP6 belong to Pseudoalteromonas,respectively.AHLs were detected with strain Agrobacterium tumefaciens KYC55.Among these bacterial strains,strain C6,4,TB,BP3 and BP4 can se-cret AHLs,while strain BP2 and BP6 can’t.And the AHLs activity differs,from the highest to the lowest are 4,TB,BP4,BP3 and C6.

Objective To explore the correlation between the expression of protease activated receptors-2 (PAR-2) and intestinal mucosal barrier injury of acute necrotizing pancreatitis (ANP) in rats.Methods The ANP rat model was created.The expression of PAR-2 in rat's intestinal mucosa of sham-operated group and ANP group at six,12 and 24 hours after model established was detected by immunohistochemistry (IHC),reverse transcription-polymerase chain reaction (RT-PCR) and Western blot.The difference between groups was analyzed by one way analysis of variance.Results The results of IHC indicated that PAR-2 expression in rat's intestinal mucosa of sham-operated group was weak.The number of PAR-2 expression positive cells and immunostaining intensity increased significantly after ANP model established.The IHC score was 4.88±0.33,5.87±0.32 and 11.17±0.27 at six,12 and 24 hours after model established respectively.Compared with those of shamoperated group (2.86 ± 0.31),the differences were statistically significant (F=747.08,P＜0.01).The expression of PAR-2 at mRNA and protein level in intestinal mucosa of sham-operated group was very low.As time extended after ANP model established,both expression increased gradually.The PAR-2 mRNA was 0.56±0.03,0.69±0.03,1.05±0.05,and the protein was 0.28±0.02,0.35±0.03,0.69±0.04 at six,12 and 24 hours after model established respectively.Compared with shamoperated group,the differences were statistically significant at each time point (F=785.69,1177.82,both P＜0.01).Conclusions PAR-2 is activated in the inflammatory progress of ANP,and may play an important role in the pathogenesis and development of intestinal mucosa barrier injury in ANP.

Objective To explore the clinical phenotype, treatment and prognosis of immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndrome, and to improve pediatricians' knowledge of this disease. Methods Clinical data of a case of IPEX with congenital ichthyosiform skin lesions were retrospectively analyzed, and related literatures China were reviewed. Results The 2-month-11-day old boy came to our hospital due to ichthyosiform skin lesions accompanied by blood oozing in the head and feet exudatation, with severe sepsis and gastrointestinal perforation. He was died of multiple organ failure. DNA sequencing of whole-genome exon group showed a hemizygous mutation of c.1150G> A, p.A384> T in FOXP3 gene. His mother was a heterozygous mutation carrier, while his father was normal. Conclusions In addition to typical symptoms including early-onset refractory diarrhea, multiple endocrine disease and growth retardation, IPEX should be considered also in infants with ichthyosiform rash and severe infection. Gene sequencing will help diagnose the disease.