Role of Toll-like receptor 4 and NOD-like receptor 3 inflammasome in liver injury of acute necrotizing pancreatitis rats with obesity / 中华胰腺病杂志

Objective To investigate the role of Toll-like receptor 4 ( TLR4 ) and NOD-like receptor 3 (NLRP3)inflammasome in the liver injury of acute necrotizing pancreatitis (ANP) rat with obesity. Methods Twenty-four SD rats were randomly divided into normal group, ANP group, obesity group and obesity ANP group. The obesity rat model was established by continuously feeding high fat diet and the ANP model was induced by retrograde infusion of 5％ sodium taurocholate into the biliopancreatic duct. Rats were killed at 12 h after model establishment, and automatic biochemical immune analyzer were used for detecting serum AMY, LIP, ALT, AST, TG and TC. Pathological changes of pancreas and liver tissue samples were observed by miscroscopy and pathological score was recorded. The levels of MPO, CD68 , TLR4, NLRP3 and IL-1βin liver tissue were detected by immunofluorescence, and NF-κB and caspase-3 in liver tissue were detected by immunohistochemistry. Results The serum ALT and AST in obesity ANP group were significantly increased than those in ANP group (233. 00 ± 34. 44 U/L vs 102. 83 ± 8. 90 U/L,388. 00 ± 41. 60 U/L vs 282. 00 ± 21. 06 U/L);and liver pathologic score was also significantly higher than ANP group (6. 66 ± 1. 21 vs 3. 33 ± 1. 03);and CD68 + /TLR4 +, CD68 + /NLRP3 +, TLR4 + /NLRP3 +, MPO, NF-κB, IL-1β and caspase-3 level were all greatly higher in obesity ANP than those in ANP group, respectively (24. 16 ± 1. 47 vs 6. 66 ± 1. 21, 25. 00 ± 2. 60 vs 7. 00 ± 1. 41, 14. 16 ± 1. 47 vs 5. 50 ± 1. 04, 35. 33 ± 6. 88 vs 20. 83 ± 2. 48, 58. 80 ± 6. 75 vs 37. 63 ± 2. 96, 50. 00 ± 2. 36 vs 35. 00 ± 2. 82, 66. 00 ± 4. 04 vs 55. 00 ± 2. 60); and all the differences were statistically significant (all P<0. 05). Conclusions Liver injury was more severe in ANP rats with obesity, which may be related to the fact that obesity may enhance the activation of TLR4/NLRP3 signal pathway and result in the release of more inflammatory factors.

Immunomagnetic Nanosphere-based Strategy for Rapid, Efficient and Accurate Detection of Lymphnode Metastatic Carcinoma Cells / 分析化学

A strategy based on immunomagnetic nanospheres ( IMNs ) for rapid, efficient and accurate detection of lymphnode metastasis carcinoma cells ( LNMCCs ) was developed in this study. First, IMNs processing magnetism and biological targeting were fabricated by the approach developed by our group previously. Then, LNMCCs in lymph node fine needle aspiration ( LNFNA) specimens were separated and enriched by the immunomagnetic isolation using IMNs. At last, the captured cells were identified with Wright's staining and immunocytochemistry ( ICC) . The separation and enrichment of LNMCCs with immunomagnetic isolation could reduce the background interference of LNFNA specimens effectively; the identification with Wright ' s staining and ICC offered more reliable information for accurate diagnosis, so the sensitivity, specificity and overall diagnostic accuracy had an obvious improvement compared with the conventional cytologic diagnosis. Besides, the simple and rapid incubation of LNFNA specimens with IMNs needed just 5 min, so the cytomorphology of captured LNMCCs could be intactly retained, which enabled to provide important basis for classifying lymphnode metastasis carcinoma ( LNMC ) and the subsequent pathological study. Moreover, the specific capture of epithelial carcinoma cells in LNFNA specimens with IMNs could make a definite diagnosis of the captured cells as LNMCCs, thus realizing the differentiated diagnosis of LNMC and malignant lymphoma. Additionally, this strategy exhibited successful LNMCCs detection in LNFNA specimens from 110 patients and had higher sensitivity ( 98 . 0%) , specificity ( 100 . 0%) , and overall diagnostic accuracy (98. 2%) than the conventional cytologic diagnosis. Therefore, it was a new attempt to use IMNs for detection of LNMCCs in LNFNA specimens from LNMC patients, and offered new ideas for LNMC diagnosis and study.

Advances in the role of autophagy in acute pancreatitis / 中华危重病急救医学

Autophagy is a self-protect cellular mechanism by which the unneeded cellular structure or impaired protein are targeted to degeneration. Acute pancreatitis (AP) is associated with autophagy tightly. This article is aimed to mainly elaborate the phenomenon that AP can be triggered by impaired autophagy and the mechanism of AP exacerbation by damaged autophagy. In AP, the reasons of impaired autophagy is dysfunction of cathepsins and lysosome associated membrane protein, which present as vacuoles accumulation in acinar cells and combination disorder of autophagolysosome, finally to activation of trypsin. By the relocation of high mobility group box 1 (HMGB1) and promotion of mitochondrial permeability transition (MPT), impaired autophagy aggravates AP. Understanding the above mechanism has certain significance to the prevention and treatment of AP.

Advances in the role of autophagy in acute pancreatitis / 中华危重病急救医学

Autophagy is a self-protect cellular mechanism by which the unneeded cellular structure or impaired protein are targeted to degeneration. Acute pancreatitis (AP) is associated with autophagy tightly. This article is aimed to mainly elaborate the phenomenon that AP can be triggered by impaired autophagy and the mechanism of AP exacerbation by damaged autophagy. In AP, the reasons of impaired autophagy is dysfunction of cathepsins and lysosome associated membrane protein, which present as vacuoles accumulation in acinar cells and combination disorder of autophagolysosome, finally to activation of trypsin. By the relocation of high mobility group box 1 (HMGB1) and promotion of mitochondrial permeability transition (MPT), impaired autophagy aggravates AP. Understanding the above mechanism has certain significance to the prevention and treatment of AP.

Method for determining o-tolidine in workplace air by gas chromatography / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To establish a method for determining o-tolidine in workplace air by gas chromatography.</p><p><b>METHODS</b>o-tolidine in workplace air was collected with a glass fiber filter, desorbed with methanol, and determined by gas chromatography-flame ionization detector.</p><p><b>RESULTS</b>The concentration of o-tolidine showed a linear relationship with peak area within 0.04∼9.00 µg/ml; the detection limit was 0.04 µg/ml; the minimum detectable concentration was 0.0002 mg/m(3) (calculated by 375 L air sample); the sampling efficiency was 93%∼100%; the elution efficiency was 94%∼96%; the relative standard deviation was 0.8-2.5%. Sample could be stored at 4 °C for at least 8 days and at room temperature for as long as 6 days.</p><p><b>CONCLUSION</b>This determination method meets the requirements of Guide for establishing occupational heath standards-Part 4 Determination methods of air chemicals in workplace (GBZ/T 210.4-2008) and is suitable for determination of o-tolidine in workplace air.</p>

Ion chromatography for determination of ammonia sampled by silica gel in air of workplace / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To establish an ion chromatography (IC) method for determination of ammonia in air of workplace.</p><p><b>METHODS</b>Ammonia in workplace air was collected in silica gel tube, desorbed with 10 mmol/L methanesulfonic acid by ultrasonic for 10 min, determined by IC.</p><p><b>RESULTS</b>The linearity range was 0.02-1.00 microg/ml. The linear equation was Y = 12041X-187 (r = 0.9997). The limit of quantification was 0.13 mg/m3 (the air volume was 1.5 L). Collection efficiency was 100%. Extraction efficiency was 99%. The relative standard deviation was 4.2%-6.3%. The penetration capacity was more than 264 microg. Sample could be stored for 14 days at least by ambient storage.</p><p><b>CONCLUSION</b>This method is convenient, applicable and sensitive, suitable to determinate ammonia in air of workplace.</p>

Implication of N-terminal pro-B-type natriuretic peptide and Tei index of left ventricle changes in children with ventricular septal defect treated by transcatheter interventional therapy / 中华心血管病杂志

<p><b>OBJECTIVE</b>To explore the implication of the dynamic changes of plasma N-terminal pro-B-type natriuretic peptide (NT-proBNP) level and Tei index of left ventricle (LV) in children with ventricular septal defect (VSD) treated by transcatheter closure.</p><p><b>METHODS</b>Sixty children with VSD treated by transcatheter closure with VSD occluder (Group VSD) and 30 healthy children (Group C) were included in this study. The plasma concentration of NT-proBNP, Tei index of LV and left ventricle ejection fraction (LVEF) were measured in Group C and at before, 5th minute, 4th hour, 1st month, 3rd month and 6th month after VSD closure in Group VSD.</p><p><b>RESULTS</b>(1) The concentration of plasma NT-proBNP was significantly increased in children with VSD before transcatheter closure compared with Group C [(229.45 ± 57.75) ng/L vs. (99.21 ± 46.86) ng/L, P < 0.01], significantly increased at 5th minute and 24th hour after transcatheter closure [(356.27 ± 96.78) ng/L and (356.38 ± 91.95) ng/L vs. (229.45 ± 57.75) ng/L, all P < 0.01], and significantly decreased at 1st month, 3rd months and 6th months after transcatheter closure [(131.33 ± 34.79) ng/L, (96.56 ± 31.55) ng/L and (93.39 ± 29.46) ng/L vs. (229.45 ± 57.75) ng/L, P < 0.05 or P < 0.01]. (2) The Tei indexes of LV in Group VSD before transcatheter closure were significantly higher than in Group C (0.45 ± 0.05 vs. 0.33 ± 0.08, P < 0.01) and Tei index was significantly increased at 24th hour, 1st month after transcatheter closure (P < 0.01) while significantly decreased at 3rd and 6th month compared with those before transcatheter closure (0.34 ± 0.07 and 0.34 ± 0.06 vs. 0.45 ± 0.05, all P < 0.01). (3) There is a positive correlation between the changes of the plasma concentration of NT-proBNP and the change of Tei index of LV before and after transcatheter closure (r = 0.653, P < 0.05).</p><p><b>CONCLUSION</b>Tei index of LV and NT-proBNP can monitor cardiac function changes in children with VSD before and after transcatheter closure.</p>

Differences in glycosylation of the E2 protein between virulent Shimen strain and a virulent C-strain of classical swine fever virus / 病毒学报

The E2 envelope glycoprotein of virulent Shimen strain and avirulent C-strain of Classical swine fever virus (CSFV) has 5 and 6 potential glycosylation sites, respectively, and the potential glycosylation site 986N is unique to C-strain. To study the differences in glycosylation between the virus pair, the E2 genes (removing signal sequence and transmembrane anchor regions) of the two strains fused with the melittin signal sequence were expressed in the Sf9 insect cells. The recombinant E2 proteins were secreted into the medium of Sf9 cells in dimer form with different molecular weight (MW). Deglycosylation of the recombinant E2 proteins by endo H and PNGase F showed that the deglycosalated Shimen-E2 and HCLV-E2 have the same MW, indicating that the different MW between Shimen-E2 and HCLV-E2 proteins came from different glycosylation. Site-directed mutagenesis in the potential glycosylation site at 986N demonstrated that the mutated Shimen-E2 protein had the same MW as the wild-type HCLV-E2 protein, while the mutated HCLV-E2 had the same MW as the wild-type Shimen-E2 protein. We suggest that the different MW between Shimen-E2 and HCLV-E2 is resulted from the different glycosylation on 986 N glycosylation site.