Objective To investigate the changes in mechanics of respiration during perioperative period in patients undergoing orthotopic liver transplantation (OLT) without venovenous bypass. Methods Thirty patients of grade Ⅱ～Ⅲ according to the American Society of Anesthesiologists (ASA) classification, undergoing orthotopic liver transplantation without venovenous bypass, were included in this study. The respiratory parameters measured perioperatively included average airway resistance, peak inspiratory pressure, peak expiratory flow rate, dynamic compliance, work of breathing and respiratory drive. The complications of respiratory system during postoperative period were observed. Results Average airway resistance was decreased after abdominal cavity opening, decreased significantly at 5 min new hepatic phase and increased postoperatively. Peak expiratory flow rate and dynamic compliance were increased gradually after induction and increased significantly at anhepatic phase and new hepatic phase but decreased significantly on the first day postoperatively. Work of breathing was decreased after induction and decreased significantly at anhepatic phase and postoperative period. There was no significant difference in peak inspiratory pressure during operation. Compared with the values preoperation, the respiratory drive was decreased significantly during anhepatic phase and new hepatic phase. Total 35 times of postoperative respiratory complications occurred, which included pleural effusion, atelectasis, pulmonary artery hypertension, pulmonary interstitial edema and pnermonia. Conclusions There are obvious changes in respiratory mechanics during perioperative period of OLT, especially in postoperative period. Mechanical respiratory support is essential for patients until respiratory function recovers.

To assess the concentration-responses relationships of propofol, 16 adult patient,ASA grade Ⅰ-Ⅱ,scheduled for upper abdominal operation, were randomly allocated to undergoing epidural block (group Ⅰ, n = 8)or combined anesthesia (group Ⅱ, n = 8) respectively. After a bolus injection of propofol 2.5mg ?kg, blood pressure (BP), heart rate (HR) and tidal volume (TV) were recorded, and drowsiness,amnesia,cooperation and orientation were evaluated by scorring scales in both groups. The venous samples were taken before and after the administration to measure the propofol plasma concentration by spectrofluorophotometric detector. The results revealed that there were no significant differences in pharmacokinetic parameters between two groups;the plasma concentration of propofol at 2. 5rag. L~(-1) was required for adequate anesthesia,and 1.5 to 1.9rag. L~(-1) for hypnosis,the patients were fully awake at 0.94?0.3mg. L~(-1); BP,HR and TV were significantly depressed at more than 2.0rag. L~(-1), and recovered to baseline at less than 1.5mg. L~(-1). It is suggested that there are good relationships between propofol plasma concentrations and its pharmacodynamic responses.

Objective　 To investigate gene rearrangement and p53 expression i n defining the nature of angioimmunoblastic lymphadenopathy. Methods　 DNA was ext racted from paraffin-embedded tissue blocks of 44 angioimmunoblastic lymphaden o pathy (AIL) patients and analyzed with polymerase chain reaction (PCR) for IgH and TCRγ gene rearrangement. Immunohistochemistry staining was used to detect p53 protein expression. Thirty-five cases were followed-up. Results　 12 out of 44 cases(27.3%) showed TCRγ gene rearr angement and 2 (4.5%) showed IgH gene rearrangement. Rearrangement of both IgH a nd TCRγ genes were detected in 2 cases(4.5%). 14 cases (31.8%) showed p53 posit i ve expression, among which 12 showed positive rearrangement and 2 showed negative (P<0.01). Eight out of 11 patients of p os itive gene rearrangement died in one year, while only 3 patients were still aliv e at the eighteenth month of follow-up, three of 24 patients of negative gene r earrangement were found dead at the time of the one year follow-up, while the r est 21 patients were alive and the longest survival time was 96 months. Conclusions　 Gene rearrangement can define th e pathological nature of AIL. The expression of p53 is highly related to gene r earrangement, and thus an important immunological marker in research on AIL.

Vol. 7, No. 3, pp. 249-255, 2006. The correspondence is changed by authors' request.

Because of the complexity of the cathepsin B-like (CBL) family, an information on the biological and biochemical characteristics of individual CBL genes is lacking. In this study, we investigated the degradative effects of the recombinant HC58 protein isolated from Haemonchus contortus parasites on protein substrates over a broad pH range in vitro. This protein, which hydrolyzed the synthetic peptide substrates Z-FR-AMC and Z-RR-AMC, had characteristics of the cysteine protease class of proteins. In the acidic pH range, the isolated protein actively degraded hemoglobin (Hb), the heavy chain of goat immunoglobulin G, and azocasein. By contrast, it degraded fibrinogen in the alkaline pH range. These activities were strongly inhibited in the presence of the cysteine protease inhibitor E-64. While the protein digested Hb, it did not induce the agglutination of erythrocytes from its natural host. These results suggest that the HC58 protein may play a role in the nutrition of this parasite.
Animals ; Caseins/metabolism ; Cathepsin B/antagonists&inhibitors/*genetics/isolation & purification/*metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; DNA, Complementary/genetics ; Goat Diseases/*parasitology ; Goats ; Haemonchiasis/parasitology/*veterinary ; Haemonchus/*enzymology/genetics/isolation & purification ; Hemagglutination Tests/veterinary ; Hemoglobins/metabolism ; Hydrogen-Ion Concentration ; Immunoglobulin G/metabolism ; Leucine/analogs & derivatives/pharmacology ; RNA, Helminth/chemistry/genetics ; Recombinant Proteins/genetics/metabolism ; Reverse Transcriptase Polymerase Chain Reaction/veterinary

The complete coding sequence of Haemonchus (H.) contortus HC29 cDNA was generated by rapid amplification of cDNA ends in combination with PCR using primers targeting the 5'- and 3'-ends of the partial mRNA sequence. The cloned HC29 cDNA was shown to be 1,113 bp in size with an open reading frame of 507 bp, encoding a protein of 168 amino acid with a calculated molecular mass of 18.9 kDa. Amino acid sequence analysis revealed that the cloned HC29 cDNA contained the conserved catalytic triad and dimer interface of selenium-independent glutathione peroxidase (GPX). Alignment of the predicted amino acid sequences demonstrated that the protein shared 44.7~80.4% similarity with GPX homologues in the thioredoxin-like family. Phylogenetic analysis revealed close evolutionary proximity of the GPX sequence to the counterpart sequences. These results suggest that HC29 cDNA is a GPX, a member of the thioredoxin-like family. Alignment of the nucleic acid and amino acid sequences of HC29 with those of the reported selenium-independent GPX of H. contortus showed that HC29 contained different types of spliced leader sequences as well as dimer interface sites, although the active sites of both were identical. Enzymatic analysis of recombinant prokaryotic HC29 protein showed activity for the hydrolysis of H2O2. These findings indicate that HC29 is a selenium-independent GPX of H. contortus.
Amino Acid Sequence ; Animals ; Base Sequence ; Cloning, Molecular ; DNA, Complementary/genetics/isolation & purification ; Glutathione Peroxidase/*genetics/*metabolism ; Goat Diseases/parasitology ; Goats ; Haemonchiasis/parasitology/prevention & control/*veterinary ; Haemonchus/*enzymology/*genetics ; Hydrogen Peroxide/metabolism ; Molecular Sequence Data ; Phylogeny ; RNA, Helminth/chemistry/genetics ; Random Amplified Polymorphic DNA Technique ; Rats ; Rats, Sprague-Dawley ; Sequence Alignment ; Sequence Analysis, DNA

Objective To investigate the dynamic changes of peripheral blood lymphocyte subsets and their correlation with renal function in recipients with stable graft status after renal transplantation. Methods Forty-five recipients who underwent renal transplantation for the first time and had stable graft function within postoperative 6 months were selected. The proportion and absolute value of lymphocyte subsets were detected by flow cytometry (FCM) in 180 peripheral blood samples from recipients at 15 d, 1, 3 and 6 months after renal transplantation. The dynamic changes of lymphocyte subsets with the extension of postoperative time and their correlation with serum creatinine (Scr) and blood urea nitrogen (BUN) were analyzed. Results The Scr levels did not significantly differ at 4 time points after renal transplantation (all P > 0.05). The BUN levels significantly differed between 15 d and 1 month after renal transplantation, and between 1 and 3 months after renal transplantation (P=0.002, P=0.001). The proportion of CD3⁺CD8⁺T cells, CD3⁺CD4⁺T cells, natural killer (NK) cells and CD4/CD8 ratio at postoperative 15 d significantly differed from those at 1 month after operation (P=0.009, P=0.004, P < 0.001, P=0.004). The proportion of B cells significantly differed between 15 d and 1 month, and between 1 and 3 months after renal transplantation (both P < 0.001). The absolute values of CD3⁺T cells, CD3⁺CD8⁺T cells, CD3⁺CD4⁺T cells and NK cells at postoperative 15 d significantly differed from those at 1 month after renal transplantation (P=0.001, P=0.002, P=0.003, P < 0.001). The absolute values of CD3⁺CD8⁺T cells significantly differed between 3 and 6 months after operation (P=0.015). The absolute value of B cells at 1 month after renal transplantation significantly differed from that at 3 months after renal transplantation (P=0.001). The proportion and absolute value of lymphocyte subsets were not significantly correlated with the Scr level (both P > 0.05). The proportion and absolute value of CD3⁺CD8⁺T cells and NK cells were negatively correlated with BUN (P < 0.001-0.05), whereas the proportion of CD3⁺CD4⁺T cells and B cells was positively correlated with the BUN level (P < 0.001-0.05). The absolute value of CD3⁺T cells was negatively associated with the BUN level (P < 0.05). Conclusions T cells and NK cells in the lymphocyte subsets of stable recipients raise to the stable state within 1 month after renal transplantation, whereas B cells decrease to stable state within 3 months renal transplantation. The dynamic changes of lymphocyte subsets are correlated with the BUN level.

Objective:To evaluate a self-designed intelligent robot-assisted minimally invasive reduction system in the reduction of unstable pelvic fractures by a cadaveric anatomic study.Methods:Ten unembalmed cadavers (7 male and 3 female ones) were used in this study. In each cadaveric specimen an unstable pelvic fracture was created in accordance with clinical case models (3 cases of type B1, 4 cases of type B2 and 3 cases of type C1 by the Tile classification). A self-designed intelligent robot-assisted minimally invasive reduction system was used to assist the reduction in the cadaveric models. Intraoperative registration and navigation time, autonomous reduction time, total operation time and reduction error were measured.Results:Effective reduction was completed in 10 bone models with the assistance of our self-designed intelligent robot-assisted minimally invasive reduction system. The time for intraoperative registration and navigation averaged 47.4 min (from 32 to 74 min), the autonomous reduction time 73.9 min (from 48 to 96 min), and the total operation time 121.3 min (from 83 to 170 min). The reduction error averaged 2.02 mm (from 1.67 to 2.62 mm), and the reduction results met the clinical requirements.Conclusion:Our self-designed intelligent robot-assisted minimally invasive reduction system is a new clinical solution for unstable pelvic fractures, showing advantages of agreement with clinical operative procedures, high reduction accuracy and operational feasibility, and reduced radiation exposure compared to a conventional operation.

Objective:To investigate the effect and mechanism of longikaurin A (LK-A) on glioma proliferation.Methods:Resuscitated frozen human glioma cell lines U87 and SNB19 were in vitro sub-cultured; CCK-8 assay was used to detect the cell activity changes 24 and 48 h after 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 6.0, 8.0 μmol/L LK-A. Edu proliferation assay was used to detect the changes in number of Edu positive cells after 0, 1, 2 and 3 μmol/L LK-A, and cell clonal formation assay was used to detect the changes in number of cell colony formation after 0, 0.1, 0.2 and 0.3 μmol/L LK-A. Flow cytometry was used to detect the changes in cell cycle proportion after 0, 1, 2 and 3 μmol/L LK-A. Expression changes of proliferation-related proteins (Ki-67 and c-Myc) and cell cycle-related proteins (Cyclin B1, Cyclin D1, cyclin dependent kinase 1 [CDKl]) and phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT) signaling pathway-related proteins were detected by Western blotting after 0, 1, 2, and 3 μmol/L LK-A. Results:U87 and SNB19 cell viabilities decreased gradually after being treated with 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 6.0, and 8.0 μmol/L LK-A for 24 and 48 h compared with those with 0 μmol/L LK-A, with significant differences ( P<0.05); cell viability was dose-dependent. The number of Edu positive cells in U87 and SNB19 after being treated with 2, and 3 μmol/L LK-A was significantly decreased compared with that with 0 μmol/L LK-A ( P<0.05). The colony formation number of U87 and SNB19 cells after being treated with 0.1, 0.2 and 0.3 μmol/L LK-A decreased significantly compared with that with 0 μmol/L LK-A ( P<0.05). The proportion of U87 and SNB19 cells at G2/M phase after being treated with 2 and 3 μmol/L LK-A were increased significantly compared with that with 0 μmol/L LK-A ( P<0.05). The Ki-67, c-Myc, Cyclin B1, CDK1, p-PI3K and p-AKT expressions were significantly decreased, while Cyclin D1 expression was significantly increased in U87 and SNB19 cells after being treated with 2 and 3 μmol/L LK-A compared with those with 0 μmol/L LK-A ( P<0.05). Conclusion:LK-A can inhibit the glioma proliferation and arrest glioma at G2/M phase, with dose-dependent manner; the mechanism is related to inhibition of PI3K/AKT signaling pathway by LK-A.

Objective:To investigate the correlation between immune function and age-related pulmonary fibrosis, as well as the potential impact of bacterial lysates on this condition.Methods:Twenty-four healthy male C57BL/6 mice, aged 24, were randomly divided into three groups: a control group(Group N), a pulmonary fibrosis group(Group M), and a pulmonary fibrosis+ bacterial lysis product intervention group(Group P). Mice in Groups M and P were intratracheally injected with bleomycin(5 mg/kg)to induce a mouse pulmonary fibrosis model, while mice in Group N were injected with saline.After modeling, mice in Group P were orally administered 0.4 ml of a bacterial lysis product once a day.After 28 days, lung tissue and blood samples were collected for analysis.Pathological changes in lung tissue were assessed using hematoxylin and tosin staining(HE)and Masson staining and the Ashcroft score.The expression of CD4+ and CD8+ in lung tissue was evaluated using immunohistochemistry.The levels of serum interferon-γ(INF-γ), interleukin-3(IL-13), and immunoglobulin A(IgA)protein were measured using Enzyme-linked Immuno Sorbent Assay(ELISA). The levels of INF-γ and IL-13 mRNA in lung tissue were determined using Real-Time Quantitative Transcription PCR(RT-qPCR). Additionally, the protein expression levels of matrix metalloprotein-9(MMP-9)and tissue inhibitor of metalloproteincise 1(TIMP-1)in lung tissue were assessed using blot analysis.Results:The degree of lung fibrosis was significantly reduced in mice in group P compared with group M when treated with bacterial lysis products.Group M showed a significant decrease in the expression of CD4+ T cells and an increase in the expression of CD8+ T cells( P<0.05)compared to group N. Additionally, the content of IgA was decreased( P<0.05)in group M. On the other hand, group P showed a significant increase in the expression of CD4+ T cells and a decrease in the expression of CD8+ T cells( P<0.05)compared to group M. Furthermore, the content of IgA was elevated( P<0.05)in group P. After bacterial lysis product intervention, mRNA and protein expression levels of IFN-γ were elevated( P<0.05), while mRNA and protein expression levels of IL-13 were reduced( P<0.05). Moreover, protein expression of MMP-9 and TIMP-1 was significantly up-regulated in group M compared with group N( P<0.05), and decreased after bacterial lysis product intervention( P<0.05). Conclusions:It is well-known that immune mechanisms play a crucial role in the development of pulmonary fibrosis.The use of bacterial lysates has been found to effectively regulate immune balance and mitigate the severity of pulmonary fibrosis in elderly mice.