Objective To explore the effect of different cold ischemia (CI) time on the changes of early intragraft cytokines (TNF-α and IL-6) and their correlation with regeneration after small-for-size (30% standard volume) liver transplantation (LT) in rats. Methods A model of Lewis rat 30% standard volume liver transplantation was established. The rats were divided into 3 groups: 1 h CI group, 8 h CI group and 16 h CI group (n= 20 in each group) according to the CI time of donor livers stored in UW solution. Survival rate at day 7 after LT in each group was recorded and specimens were collected at predetermined intervals from 90 min, 1, 2, 4 h and 7 day post-reperfusion. Expression patterns of TNF-αand IL-6 were determined and compared in 30% liver grafts with different CI time following transplantation. Progression of DNA synthesis of hepatocytes was confirmed by BrdU uptake. Morphological assessment of the liver grafts was also made. Results Operative success rate of LT was 100% in all groups. Mean survival rate in 1 h and 8 h CI group was 100% respectively (＞ 7 day). Mean survival rate in 16 h CI group was low, and no recipient animals survived on the postoperative day 7. Compared with 1 h CI group, IL-6 expression in 30% liver grafts stored for 8 h and 16 h was markedly increased post-transplantation (F=184.12, P<0.05). TNF-α expression in 30% liver grafts in 8 h and 16 h CI groups was markedly increased post-reperfusion (F=58.81, P< 0.05). There was no statistically significant difference in the expression of TNF-α and IL-6 between 8 h CI and 16 h CI groups. Number of positively stained nuclei in 1 h CI group was greater than that in 8 h CI group at 24 h after transplantation (t=5.59, P<0.05). At 24 h after transplantation histology showed mild injury in grafts of CI 1 h group. CI 8 h led to mild sinusoidal dilatation and inflammation.Grafts stored for 16 h demonstrated focal congestion, hepatocyte collapse and necrosis. Conclusion At the early stage of small-for-size liver transplantation, up-regulation of cytokines (TNF-α and IL-6) is an important factor in the liver regeneration. The early initiating signals for the regenerative response are present in the small-for-size liver grafts with different CI time.

Objective To screen antarctic bacteria producing EPA and analyse its composition of fatty acids.Methods Two hundred strains of bacteria were isolated from ice and soil of the Antarctic.The total lipid was extracted by using a modified one-phase Bligh and Dyer extraction,and screened by means of GC using fish oil as standard.In the end,eight strains of bacteria were screened which had high content of EPA or DHA.Among them,one bacterium(NJ136) which had the highest content of EPA was obtained,its total lipid was extracted by means of Soxhlet extractor,and the compositions of fatty acids were analysed by means of GC-MS.Results and conclusion The relative contents of EPA and total unsaturated fatty acids of NJ136 were 6.66% and(51.92%) respectively,the content of total fat,EPA and unsaturated fatty acids of dry bacteria weight were 7.94%,5.3 mg?g~(-1) and 41.2 mg?g~(-1),respectively.

Objective To explore the molecular mechanisms involved in liver regeneration after different cold ischemic (CI) times for the liver graft in 30% volume rat liver transplantation. Methods A model of 30% volume Lewis to lewis rat liver transplantation with hepatic artery reconstruction was established. Rats were grouped as follows: 1 h CI group (n =25), 8 h CI group (n =25) and 16h CI group (n = 25). Survival rate of rats in each group and liver regeneration were observed. Specimen were collected at predetermined intervals from 90 min, 1,4 and 7 d post-reperfusion. TNF-α and IL-6 expression, STAT3 activation were determined in liver grafts. Expression of cyclin D1 and hepatocyte replication with BrdU uptake were studied by immunohiatochemistry. Statistical analysis was used to compare BrdU positively stained hepatoeytes at 1 d post- reperfusion in each group. Results 30% liver transplantation was performed in a total of 75 rats. Compared with rats in 1 h CI group, TNF-α and IL-6 expression in 8 h CI and 16 h CI groups were markedly increased after 30% liver transplantation. STAT3 activity in 8 h CI and 16 h CI groups was significantly increased. Cyclin D1 expression in 8 CI group was demonstrated with cytoplasmic and nuclear staining. Grafts in 16 h CI group showed large areas with no cyclin D1 expression. Number of hepatoeytes with positively stained neclei in 1 h CI group was more than that in 8 h CI group at 1 d after transplantation (t = 6.14, P < 0.05). Conclusion Liver regeneration following 30% liver graft transplantation may be through TNF-α/IL-6/STAT3/ Cyclin D1/DNA synthesis pathways. The reason for 30% liver graft failure with significant cold ischemic injury is that hepatocytes may not respond to initiating signals for liver graft regeneration.

Objective To identify the molecular characteristics on nucleotide and amino acid in E gene through the comparative analysis of differences between genotype 3 Japanese encephalitis virus(JEV)in China and the live attenuated vaccine(SA14-14-2).Methods Obtained the E gene nucleotide sequence of Japanese encephalitis virus from GenBank.Multiple alignment and amino acid(AA)analysis were carried out by Clustal X(1.81),DNAStar and GENEDOC(3.2).According to the ribbon diagram of the E protein structure based on the model of the soluble fragment of tick-borne encephalitis virus(TBEV)as a template for Japanese encephalitis virus E protein amino acid sequence analysis.Results Compared different regions and different host genotype 3 JEV with SA14-14-2 the nucleotide sequence homology was,up 96%and 95% and the amino acid homology was up 95%and 94%,respectively.The nucleotide and amino acid homology was higher among the same area and the same host.Ten common amino acid variations and five special variations(E160 in domain Ⅰ,E123 and E227 in domain Ⅱ,E441 and E487 in non-structural domain)were found between genotype 3 JEV and SA14-14-2.Conclusion The homology in E gene was higher between genotype 3 JEV in China and SA14-14-2.Five special amino acid differences were found in genotype 3 JEV.The existing live attenuated vaccine strain is theoretically possible to protect genotype 3 JEV in China.

Objective:To study the influence of occlusal force change on apoptosis of periodontal ligament fibroblast(PDLF) and expression of proliferating nuclear antigen(PCNA) in the fibroblasts,so as to explore the possible mechanism for remodeling of periodontal ligament.Methods:Animal model of occlusal force change was established by extracting the right first,second and third maxillary molars in male SD rats.The rats were sacrificed at 6,12 hours and day 1,2,3,5,7,14,and 28 d after extracting the teeth(n=6),and their alveolar bone tissues were harvested.H-E staining was used to observe the morphologic changes of the alveolar bone tissues.TUNEL method and immunohistochemistry were used to detect apoptosis and PCNA expression in PDLF.The rats with normal occlusal forces were used as control(n=6).The results were assigned a mean score based on the percentage and the intensity of cells positively stained for TUNEL and PCNA.Results:Animal model of occlusal force change was successfully established.H-E staining showed that the control group had more pycnotic periodontal ligament,orderly fibres,and flatter alveolar bone than the model group.TUNEL result showed that the cell apoptosis reached its peak at 12 h after extracting the teeth(252.67?6.62),significantly higher than that of control group(7.17?2.32,P

Objective To observe the effects of intrathymic islet transplantation or renal subcapsule islet transplantation on the graft survival.Methods C57BL/6 mice were used as recipients and BALB/c as donors The recipients receiving intrathymic or renal subcapsule islet transplantation were divided into simple transplantation groups and the group intraperitoneally receiving rabbit antithymocyte serum(ATS) at the time of islet transplantation.Results The median survival time (MST) of simple intrathymic allografts were 19.5 days,longer than that of allografts implanted beneath the renal capsule.Administration of ATS at the time of islet transplantation delayed rejection of islets transplanted to the renal subcapsute(MST,43.0 days),and intrathymic allografts were superior(MST,93.8 days).Six of 8 intrathymic grafts with administration of ATS survived permanently.especially a state of donor-specific unresponsiveness was induced.Conclusion The thymus may be an immunoprivileged site for islet transplantation and may play an important role during the induction of immune tolerance.

Tumor is still an unresolved health problem for human.The main obstacle for tumor cure is that precise diagnosis of tumor at the early stage can't be realized,which leads to the mortality increased year by year due to missing the best time of the treatment.Furthermore,lack of targeted ability and serious side effects of the medicine used for tumor treatment also limit the clinical application.Therefore,it is urgent to design and develop a novel targeted drug delivery vehicle.Recent studies show that targeted nanomaterials are superior on tumor-specific diagnosis and target therapy.This review will highlight the current advances in the targeted nanomaterials effect on tumor diagnosis and treatment in recent years and prospect the foreground of future development.

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Objective To study the molecular mechanisms of hepatoeyte regeneration following different cold preservation (CP) durations after rat partial liver transplantation. Methods Mate inbred Lewis rats were used as donors and recipients. Donor liver was kept in 4℃ UW solution for 1 h (coldisehemia 1 h group, CI 1 h group), 8 h (CI 8 h group) and 16 h (CI 16 h group) and then implantedorthotopieally. 50% liver graft transplantation model was established by ligating the left portion ofmedian lobe, left lateral lobe and caudate lobe with 3-O silk suture prior to reperfusion. Survival rate ofeach group and hepatoeyte regeneration were recorded after grafting. Reverse transcription-polymerasechain reaction was used to detect the expression of IL-6 and TNF-α in the liver tissues. Western blotanalysis was done to measure STAT3 activation in the liver. Immunohistoehemistry was conducted toanalyze the expression of cyclin D1 and hepatocyte replication with BrdU uptake in the graft. ResultsOperative success rate in all groups was 100%. Compared with CI 1 h group, the TNF-α and IL-6expression (F=67.45 for TNF-a comparison, P<0.05 and F=287.73 for IL-6 comparison,P<0.05 respectively) in 8 h CI and 16 h CI groups was markedly increased after partial grafttransplantation. STAT3 activity in 8 h C1 and 16 h C1 groups was also significantly increased ascompared with that in 1 h CI group. Cyclin D1 expression in 8 CI group was demonstrated withcytoplasmic and nuclear staining at 24 h after transplantation. Grafts in 16 h CI group showed largeareas with no cyclin D1 expression. Number of hepatocytes with BrdU positively stained neclei in 8 hCI group was more than that in 16 h C1 group at 24 h after transplantation (t=19.40, P<0.05).Conclusion Hepatocytes regeneration was present following rat partial transplantation in the graftspreserved for limited time, which may be regulated by TNF-α/IL-6' STAT3/ Cyelin D1/DNAsynthesis pathways; Hepatocytes could not respond to early signals for liver graft regeneration when50%liver graft preserved for 16 h.

Objective To evaluate the feasibility of using corrected body weight to set the tide volume for mechanical ventilation during general anesthesia in obese patients.Methods Ninety-six ASA physical status Ⅰ or Ⅱ obese patients,with a body mass index of 28-44 kg/m2,scheduled for elective extremity surgery under general anesthesia,were divided into 3 groups (32 cases of each group) by random digits table method:tide volume based on actual body weight group (group A),tide volume based on ideal body weight group(group B),and tide volume based on corrected body weight group(group C).The pulmonary function of all patients was normal.The patients were endotracheally intubated and mechanically ventilated after induction of anesthesia.According to the corresponding body weight,the initial tide volume was set based on 8 ml/kg in each group(respiratory rate:15 bpm).At 10 min after start of mechanical ventilation,peak airway pressure (Ppeak),airway plateau pressure (Pplat),airwayresistance (Raw) were recorded.Arterial blood samples were collected at 30 min of mechanical ventilation for blood gas analysis and arterial blood oxygen partial pressure (PaO2),arterial blood carbon dioxide partial pressure (PaCO2) and the patients requiring readjustment of tide volume were also recorded.Results The level of Ppeak,Pplat,Raw in group B and group C were significantly lower than those in group A[(15.3 ± 1.8),(18.5 ± 2.6) cmH2O (1 cmH2O =0.098 kPa) vs.(23.2 ±3.3) cmH2O; (11.5 ± 1.6),(14.3 ± 1.4) cmH2O vs.(17.6 ±2.7) cmH2O; (10.8 ± 1.7),(12.5 ± 2.6) cmH2O/ (L·s) vs.(16.8 ± 3.0) cmH2O/ (L·s)],and the level of PaCO2 in group B and group C was significantly higher than that in group A [(48.8 ± 3.1),(40.2 ± 2.3) mmHg (1 mmHg =0.133 kPa) vs.(28.6 ± 3.8) mmHg],there was significant difference(P ＜ 0.01).The level of PaO2 and oxygenation index in three groups had no significant difference (P ＞ 0.05).There were no patients requiring readjustment of tide volume in group C,however,93.8％ (30/32) patients required readjustment of tide volume in group A and 81.2 ％ (26/32) in group B,there was significant difference (P ＜ 0.01).Conclusion Corrected body weight based on 8 ml/kg can be used to set the tide volume for mechanical ventilation during general anesthesia in obese patients with normal pulmonary function.