Aim To investigate the effect of orientin on proliferation and differentiation of 3T3-L1 pre-adipocytes and on insulin resistance(IR) in 3T3-L1 adipocytes and the possible mechanisms.Methods MTT assay and oil red O staining were applied to investigate the proliferation and the differentiation of 3T3-L1 pre-adipocytes, respectively.The intracellular triglyceride(TG) contents were detected by enzymatic analysis.IR model was induced with dexamethasone.A fluorescent glucose analogue, 2-NBDG, was used to measure the rate of glucose uptake.Western blot was used to detect the protein level of GLUT4 and phosphorylation of AMPK and ACC.The GLUT4 translocation was measured by fluorescent-immunohistochemistry.Results Orientin decreased the formation of lipid droplets and intracellular TG contents(P<0.01) in a concentration-dependent manner(P<0.05), but it had no obvious effects on the cell vitality.Under the IR state, orientin significantly increased 3T3-L1 adipocytes glucose uptake(P<0.05).Meanwhile, orientin up-regulated the protein expression of p-AMPK, p-ACC, and enhanced GLUT4 translocation and its expression.Conclusion Orientin can effectively inhibit the differentiation of 3T3-L1 pre-adipocytes and increase insulin sensitivity due to the activation of AMPK/GLUT4 signal pathway.

Objective To assess the overall diagnostic value of computed tomography pulmonary angiography (CTPA) in patients with suspected pulmonary embolism with the pulmonary angiography as the gold standard.Methods A search in Cochrane Library,PubMed,OVID,and China National Knowledge Infrastructure (CNKI) was performed to identify relevant English and Chinese-language articles from 01/01/1992 to 01/01/2003 (English) and from 01/01/1994 to 01/01/2003 (Chinese),respectively.Criteria for inclusion were established based on validity criteria for diagnostic research published by the Cochrane Methods Group on Screening and Diagnostic Tests.Subsequently,the characteristics of the included articles were appraised and extracted.Statistical analysis was performed employing Meta-Test version 0.9.Heterogeneity of the included articles was tested,which was used to select proper effect model to calculate pooled weighted sensitivity and specificity.Summary Receiver Operating Characteristic (SROC) curve was performed and the area under the curve (AUC) was calculated.Finally,sensitivity analysis was performed.Results Ten of 407 retrieved articles were included,with a total of 855 patients.The reported sensitivity of CTPA ranged from 0.57 to 1.00,and specificity ranged from 0.78 to 1.00.The pooled weighted sensitivity and specificity for CTPA with 95% confidence interval (95% CI) after correction for standard error were 0.84 (0.73,0.91) and 0.91 (0.87,0.94),respectively.The AUC of SROC was 94.95%. Sensitivity analysis demonstrated no disproportionate influences of individual study.Conclusion CTPA has a highly accurate sensitivity and specificity with a strong ROC curve making it an alternative non-invasive method of pulmonary angiography in the diagnosis of PE.