Emodin Inhibits Lipopolysaccharide-Induced Inflammation by Activating Autophagy in RAW 264.7 Cells / 中国结合医学杂志

OBJECTIVE@#To investigate the effects of emodin on inflammation and autophagy in lipopolysaccharide (LPS)-induced RAW 264.7 macrophages and reveal its underlying mechanism.@*METHODS@#3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay was conducted to find the appropriate dose for emodin. RAW264.7 cells pretreated with different concentrations (0-50 μmol/L) of emodin or vehicle for 2 h prior to exposure to LPS for 16 h. Cell morphology was examined and propidium iodide staining was used to examine cell cycle. Expressions of inflammation-related proteins [nuclear factor-kappaB (NF-κ B) and I-kappaB (I κ B)α] and autophagy-related proteins [light chain (LC)3, P62/sequestosome 1, mammalian target of rapamycin (mTOR), and p-mTOR] were examined using Western blot analysis. Expression of inflammation-related cytokines including tumor necrosis factor (TNF)-α, interleukin (IL)-1β and IL-6 were detected by enzyme-linked immunosorbent assay. Autophagy was examined with LC3B fluorescence intensity and aggregation. The effect of emodin on autophagy was conducted with an autophagy inhibitor, 3-methyladenine (3-MA).@*RESULTS@#The expression of NF-κ B in LPS-induced cells was significantly increased (P<0.01) and simultaneously I κ B α decreased compared with the normal cell (P<0.05). The expressions of TNF-α, IL-β, and IL-6 proteins in the LPS-induced RAW264.7 cells were significantly higher than in the normal cell (P<0.05 or P<0.01). LPS increased the percentage of cells in the G@*CONCLUSION@#Emodin could inhibit inflammation of mice RAW264.7 macrophages induced by LPS, possibly through activating autophagy.

Circ_0049447 acts as a tumor suppressor in gastric cancer through reducing proliferation, migration, invasion, and epithelial-mesenchymal transition / 中华医学杂志(英文版)

BACKGROUND@#Although increasing abnormal expression of circular RNAs (circRNAs) has been revealed in various cancers, there were a small number of studies about circRNAs in gastric cancer (GC). Here, we explored the expression and function of a novel circRNA, circ_0049447, in GC.@*METHODS@#A total of 80 GC tissues and non-tumorous tissues were collected from the First Affiliated Hospital of China Medical University. And all cells were cultured with 10% fetal bovine serum and incubated at 37°C and 5% CO2. The expression of circ_0049447 was quantified by real-time polymerase chain reaction. The biological function of circ_0049447 on proliferation, migration, invasion, and epithelial-mesenchymal transition (EMT) was evaluated by cell counting kit-8 (CCK-8), colony formation assay, transwell migration and invasion assay, and Western blotting. Luciferase report assay was used to verify the direct binding between circ_0049447 and predicted microRNA (miRNA). Furthermore, a xenograft mouse model was used to validate the function of circ_0049447 in vivo.@*RESULTS@#We demonstrated that circ_0049447 was downregulated in GC (P < 0.001). The area under the receiver operating characteristic curve reached 0.838, while sensitivity was 82.3% and specificity was 77.2%. CCK-8 and colony formation assay showed that overexpression of circ_0049447 could inhibit the proliferation (P < 0.05). Transwell migration and invasion assay showed upregulated circ_0049447 could impede migration in GC cells (P < 0.05). In addition, overexpression of circ_0049447 could impede GC cell EMT. Upregulation of miR-324-5p in GC specimens and direct binding between miR-324-5p with circ_0049447 proven by luciferase reporter assay indicated that circ_0049447 may inhibit GC by sponging certain miRNA.@*CONCLUSION@#Circ_0049447 acts as a tumor suppressor in GC through reducing proliferation, migration, invasion, and EMT, and it is a promising biomarker for diagnosis.

Clinic analysis of 16 patients of craniocerebral trauma with Labbé vein injury / 中华外科杂志

<p><b>OBJECTIVES</b>To study the mechanism of Labbé vein injury, and its effect on traumatic cerebral infarction and prognosis in patients of craniocerebral trauma.</p><p><b>METHODS</b>The clinic imageology and data of 16 patients of craniocerebral trauma with Labbé vein injury approved intraoperatively from June 2006 to February 2009 were analyzed. To compare the effect of the intraoperative finding of Labbé vein damage and blood vessel treatment on traumatic cerebral infarction, and to analyze the traumatic cerebral infarction size and prognosis.</p><p><b>RESULTS</b>All the 16 patients had acute subdural hematoma and(or) intracerebral hematoma. And 15 of all the 16 patients with Labbé vein injury suffered from skull fractures. All patients accepted hematoma cleaning and intracranial decompression procedure by removing skull. The preoperative Glasgow coma scale (GCS) were as following: 5 patients being between 9 - 12, 7 patients being between 6 - 8 and 4 patients being between 3 - 5. Eight patients had cerebral hernia before operations on admission, and among them, 3 patients had corectasis of both sides and 5 patients had corectasis of only one side, the other 8 patients had no corectasis. Postoperatively, 14 patients suffered from traumatic cerebral infarction of different grades. After follow-ups of 24 months, 8 patients had relatively good prognosis, with 4 patients having good recoveries and 4 having middle disability; the other 8 had bad prognosis, including 3 patients being seriously disable and 5 kept vegetative state.</p><p><b>CONCLUSIONS</b>Impact injury and counterblow are the main reasons to the injury of Labbé vein, which consequently leads to serious traumatic cerebral infarction and bad prognosis. Intraoperatively, it is quite important to protect Labbé vein during the surgery, which should not be easily cut or obstructed by electric coagulation, and this is an effective way to improve the prognosis of these patients.</p>

Establishment of loop-mediated isothermal amplification method for detection of Legionella pneumophila / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To establish a simple and rapid molecular detection for Legionella pneumophila.</p><p><b>METHODS</b>The loop-mediated isothermal amplification (LAMP) was applied for detection of Legionella pneumophila. A set of primers were designed to identify six special areas in mip gene of Legionella pneumophila. Genomic DNAs from 13 bacterial strains,including 8 Legionella pneumophila strains and 5 other bacterial strains were amplified by LAMP and general PCR method to evaluate the specificity and sensibility of LAMP.</p><p><b>RESULT</b>All positive tubes produced visible white precipitation, and no precipitation was observed in others. By adding smart green fluorescent dye, all Legionella pneumophila positive tubes presented a strong green fluorescence, while others showed weak fluorescence. The detection rate of LAMP was higher than that of general PCR. The detection limits were 576fg with genomic DNA of Legionella pneumophila,and 8 cfu/mL with positive water samples.</p><p><b>CONCLUSION</b>LAMP detection of Legionella pneumophila is an effective and low-cost method with high specificity and sensitivity requiring no special equipment.</p>