Objective　To introduce the research trence of the medchnisims of ischemia/reperfusion(I/R) injury in transplanted liver(TL). Methods　Making a literature summarization based on papers review.Results　The main mechnisms of I/R injury in TL as the followings: (1) Production of various cytokines resulted from endothelial cell injury with activation of kupffer cells, which can result in TL injury and induce systemic inflammation syndrom. (2) White blood cells and platelets adhere to the liver sinusoid (LS), which can cause TL injury and obstruct the LS causing “no reperfusion" of TL. (3) Alteration of pH in the cells of TL. After recovery of normal metabolism of the reperfused TL, alteration of pH in the TL can cause damage to TL cells, and cause edema of mitochrondria resulting in decresing of TL function. (4) Reoxygenation injury mainly caused by activated oxygen relsased by white blood cell. Conclusions　I/R injury of TL is caused by combination of muttiple foctors. Improving the activity of hepatocytes and endothelial cells, imhibiting the activation of kupffer cells, decreasing the production of activated oxygen and TNF are the key points in preventing I/R injury of TL.

Objective To explore the mechanisms of ischemia-reperfasion(I/R)injury of the bile duet and the effect of Atomolan on Isehemia-reperfusion injury of the bile duct in liver transplantation.Methods Pathological changes of the bile duct cells in three groups of rat liver transplantation model were observed through light microscope.And the effective protection of Atomolan against ischemia-repeffusion injury was observed.Results In ischemia-reperfusion group,the injury of bile duct cells were more serious,the level of ALT,AST and γ-glutamyhransferase elevated higher,oxygen free radical generated more,and the apoptosis of bile duct ceils appeared more,compared with Atomolan pretreatment.Conclusion The injury in bile duct cells is more serious than that in hepatoeyte in I/R injury.Atomolan can provide effective protection against liver Ischemia-reperfusion injury.The mechanisms may be through depress the production of oxygen free radical and decrease the apoptosis of bile duct cells.

Objective To investigate the effects of different surgical modalities on primary anorectal malignant melanoma. Methods Clinical data of 60 primary anorectal malignant melanoma cases who were admitted between 1965 and 2007 were collected, summarized and analyzed. Multivariate analysis was performed using the COX proportional hazards regression method. Results Tumors located in the rectum in 50 cases, in the anal canal in 10 cases. The overall survival rates were not significantly different between the 23 cases who received tumor resection only and those 30 cases receiving postoperative adjuvant therapy (X2=0. 078, P>0.05). Among these 53 surgical cases of anorectal malignant melanoma, 37underwent abdominoperineal resection, 16 underwent wide local excisions, There was no significant difference of the survival rates between the two groups (X2=1.464,P>0.05). Risk factors analysis revealed that the depth of tumor invasion is a risk factor (P<0.05), the modality of treatment is a protective factor (P<0.05). Conclusions Surgical operation is the principal effective management for anorectal malignant melanoma, Wide local excision is the principal therapeutic choice for localized well-circumferential anorectal malignant melanomas.

Purpose To observe the impact of sleep deprivation (SD) for 24 hours on human brain regional homogeneity (ReHo) by using functional magnetic resonance imaging (fMRI),and briefly discuss the intervening effect of transcranial direct current stimulation (tDCS) on ReHo after SD.Material and Methods Sixteen healthy individuals were enrolled,and self-controlled study were adopted.Resting-state fMRI scans were performed in wakefulness,after SD,and after tDCS (true or placebo stimuli).The ReHo analysis approach was employed to calculate the ReHo values of whole brain in different states.The differences between before and after SD,and between true and false tDCS after SD,were analyzed.Results Compared with wakefulness,SD mainly enhanced ReHo in brain regions of left precentral gyrus,right precentral gyrus,bilateral temporal lobe and thalamus,but decreased ReHo in brain regions of right precuneus,left superior occipital gyrus,limbic lobe and bilateral angular gyrus,superior frontal gyrus,middle frontal gyrus.Compared with placebo stimuli,the true tDCS enhanced ReHo in brain regions of bilateral precuneus,angular gyrus and right forehead,superior middle gyrus,but decreased ReHo in brain regions of the medial side of left frontal lobe,right precentral gyrus,parahippocampal gyrus,substantia nigra and bilateral temporal lobe,pons and so on.Conclusion SD can cause ReHo change in a large number of brain regions.The tDCS on the prefrontal cortex improves the brain regions with ReHo reduction caused by SD.The improved brain regions mainly include bilateral precuneus/posterior cingulate cortex.Therefore,tDCS on the prefrontal cortex can improve brain dysfunction caused by SD.

Objective To evaluate the therapeutic effect,prognostic factors and the methods to improve long term survival of liver resection for hepatic metastases of colorectal cancer.Methods 52 patients operated on for hepatic metastases from colorectal cancer were followed up,and the clinical and pathologic data of 11 (cases),who survived more than 5 years,were compared with 41 survivors of less than 5 years after hepatic (resection).Results The 1-,3-and 5-year survival rate was 75.0%,30.8%,and 21.2%,(respectively).The important factors affecting prognosis were pathologic type of the primary cancer,(number) of (hepatic) metastasis,selection of the methods and timing of surgery,and postoperative treatment(P

Objective: To understand the epidemiological characteristics of the norovirus epidemics in Haidian District, Beijing Municipality from 2015 to 2022, so as to provide insights into epidemic prevention and control. Methods: The epidemiological characteristics, case data, and laboratory testing of norovirus epidemics were collected in Haidian District from 2015 to 2022, and the temporal distribution, spatial distribution, population distribution, and norovirus detection were analyzed using a descriptive epidemiological method. Results: A total of 208 norovirus epidemics involving 3 530 cases were reported in Haidian District from 2015 to 2022, with a median attack rate of 25.00% (interquartile range, 18.35%). The main pathogens detected were type GⅡ, accounting for 87.98% (183 cases), and the main transmission mode was interpersonal transmission, accounting for 93.27% (194 cases). Norovirus epidemics peaked from March to June and October to December, accounting for 44.71% (93 epidemics) and 44.23% (92 epidemics), and predominantly occurred in schools and preschool institutions, accounting for 51.92% (108 epidemics) and 40.38% (84 epidemics). The median age of norovirus infected cases was 8 (interquartile range, 13) years. There were 1 920 males and 1 610 females, with a ratio of 1.19︰1. The positive rates of case specimens, key population specimens and environment smeared specimens in epidemic units were 74.32%, 13.91% and 5.86%, respectively. Conclusions The norovirus epidemics in Haidian District from 2015 to 2022 was mainly caused by type GⅡ and spread from person to person. The epidemics peaked in winter and spring, and schools and preschool institutions were the key units of prevention and control.

Objective To report a Chinese pedigree with benign familial chronic pemphigus (BFCP),and to screen mutations of ATP2C 1 gene in this family.Methods A 39-year-old male patient with BFCP andhis family members underwent a clinical investigation.Blood samples were collected from all the members in this family and from 50 unrelated healthy controls.Genomic DNA was extracted from the blood samples,and PCR was performed to amplify all the 28 exons and flanking sequences of the ATP2C1 gene followed by DNA direct sequencing.The resulted DNA sequences were compared with the reported sequences of APT2C1 gene in Genbank (Number:NM_014382.2 and NC_000003.9).Results There were 24 family members in the four-generation pedigree,with 8 members affected by BFCP.A single-nucleotide substitution,c(1696C→T),in exon 17 of the ATP2C1 gene was identified in all of the members with BFCP,but not in unaffected third-or second-generation members or unrelated healthy controls.This substitution was also found in 1 out of 4 family members of fourth-generation.Conclusions The nonsense mutation c(1696C→T) in the ATP2C1 gene,is likely to be responsible for BFCP in this Chinese four-generation pedigree.The underage family member of fourth-generation who carried the mutation c(1696C→T) but had no clinical symptoms of BFCP,should be closely followed.

BACKGROUND: The study aimed to estimate the value of embryonal natural orifice transluminal endoscopic surgery (ENOTES) in treating severe acute pancreatitis (SAP) complicated with abdominal compartment syndrome (ACS). METHODS: The patients, who were randomized into an ENOTES group and an operative group, underwent ENOTES and laparotomy, respectively. The results and complications of the two groups were compared. RESULTS: Enterocinesia was observed earlier in the ENOTES group than in the operative group. Acute Physiology and Chronic Health Evaluation II (APACHE II) score of patients in the ENOTES group was lower than that of the operative group on the 1st, 3rd and 5th post-operative day (P<0.05). The cure rate was 96.87％ in the ENOTES group, which was statistically different from 78.12％ in the operative group (P<0.05). There were significant differences in complications and mortality between the two groups (P<0.01). CONCLUSION: Compared with surgical decompression, ENOTES associated with flexible endoscope therapy is an effective and minimal invasive procedure with less complications.

In order to improve the thermostability of the Penicillium expansum Lipase (PEL), the lipase encoding genes was mutated by site-directed mutagenesis. A recombinant vector pAO815-ep8-K55R which contain double mutant genes was constructed by overlap extension PCR using the cDNA of a random-mutant lipase ep8 (a single site mutant) as the template and two special primers were used to generate another mutation site K55R. The recombinant vector was transformed into Pichia pastoris GS115 by electroporation and the recombinant mutant GS-pAO815-ep8- K55R can secret double-mutant lipase PEL-ep8-K55R-GS into the medium when it was induced by Methanol. The yield of the double-mutant lipase is 508 u/mL, which is 81% that of the wild type lipase PEL-GS (627 u/mL) and 55% that of random-mutant PEL-ep8-GS (924 u/mL). The specific activity of double-mutant lipase is 2309.1 u/mg, which is similar to random-mutant lipase PEL-ep8-GS and the wild type lipase PEL-GS. The optimum temperature of the double-mutant lipase is same with the wild type lipase PEL-GS and random-mutant lipase PEL-ep8-GS. While the Tm of the double-mutant lipase is 41.0 degrees C, 2.3 degrees C higher than the wild type lipase PEL-GS and 0.8% higher than the random-mutant lipase PEL-ep8-GS, indicating that the double-mutant lipase PEL-ep8-K55R-GS has higher thermostability.
Electroporation ; Enzyme Stability ; Hot Temperature ; Lipase ; genetics ; metabolism ; Mutagenesis, Site-Directed ; Mutant Proteins ; metabolism ; Penicillium ; enzymology ; Pichia ; genetics ; metabolism ; Protein Engineering ; methods ; Recombinant Proteins ; biosynthesis ; genetics

Objective To investigate the correlation between CT perfusion parameters of pulmonary carcinoma and standardized uptake values(SUV)derived from ~(18)F-fluoro-deoxyglucose positron emission tomography(~8F-FDG PET)and tumor microvessel density(MVD),and to determine the validity of CT perfusion in assessing tumor angiagenic activity of pulmonary carcinoma.Methods Fifty patients(mean age 57.5,17 females)with pulmonary carcinoma underwent CT perfusion using 16-slice helical CT.Blood flow(BF,ml?100g~(-1)?min~(-1)),blood volume(BV,ml?100g~(-1)),mean transmit time(MTF,s)and permeability surface area product(PS,ml?100g~(-1)?min~(-1))were analyzed.SUV of PET was calculated in 14 patients.The CD34 immunohistochemical staining was used for tumor microvessel counting.CT perfusion parameters of pulmonary carcinoma were correlatively studied with SUV and tumor MVD.Pearson's correlation analysis was performed to evaluate the association between CT perfusion parameters and SUV and MVD.Results The average values of BF,BV,MTT and PS were 97.30 ml?100g~(-1)?min~(-1), 8.86 ml?100g~(-1),6.75 s and 34.52 ml?100g~(-1)?min~(-1),respectively.The average value of MVD was 61.82/FOV.The mean value of SUV was 5.96.There was positive correlation between BF and SUV(r= 0.727,P