ABSTRACT
<p><b>OBJECTIVE</b>To explore the role of the receptor for advanced glycation end products (RAGE) in regulating the expression of MUC5AC and mucus production in a mouse model of toluene diisocyanate (TDI)?induced asthma.</p><p><b>METHODS</b>BALB/c mice were randomly divided into control group, vehicle (AOO) group, TDI?induced asthma group and RAGE inhibitor (FPS?ZM1) group. PAS staining, Western blotting, and immunohistochemistry were used to analyze the changes in mucus production and MUC5AC expression in the airway of the mice, and the expression of p?ERK was detected with Western blotting. In vitro cultured human bronchial epithelial cell line 16HBE was transfected with lentiviral vector carrying short hairpin RNA targeting RAGE (shRNA?RAGE) and subsequently challenged with a TDI?human serum albumin (TDI-HSA) conjugate, and the changes in cellular MUC5AC mRNA expression as detected using RT-PCR; the protein expressions of ERK and p?ERK in the cells were examined with Western blotting. The effect of ERK inhibitor U0126 pretreatment on MUC5AC mRNA expression was also analyzed in the cells.</p><p><b>RESULTS</b>Compared with the control mice, TDI-induced asthmatic mice showed significantly higher rates of PAS positivity and increased MUC5AC and p?ERK expressions in the airway (P<0.05). Treatment with FPS?ZM1 significantly decreased PAS positivity and lowered MUC5AC and p?ERK expressions in the airway of the asthmatic mice (P<0.05). Exposure of 16HBE cells to TDI?HSA caused a significant increase in MUC5AC mRNA expression and p?ERK protein expression (P<0.05), while RAGE knockdown obviously suppressed TDI?HSA-induced upregulation of p-ERK and MUC5AC mRNA (P<0.05). Treatment with the ERK inhibitor U0126 also lowered TDI?HSA?induced up?regulation of MUC5AC mRNA in the cells (P<0.05).</p><p><b>CONCLUSION</b>RAGE signaling induces MUC5AC expression via extracellular signal-regulated kinase pathway to promote mucus overproduction in mice with TDI-induced asthma.</p>
ABSTRACT
<p><b>OBJECTIVE</b>To evaluate the effect of partial splenic embolization (PSE) in prevention of gastroesophageal variceal rebleeding.</p><p><b>METHODS</b>Sixty-two patients with recent gastroesophageal variceal bleeding were treated by PSE with Seldinger technique. All the patients were followed-up for 12 months. The data including peripheral blood cell count, liver function, plasma prothrombin time (PT), portal vein diameter, and appearance of gastroesophageal varices under gastroscopy were collected before and after embolization for statistical analysis.</p><p><b>RESULTS</b>Five days after the operation, the numbers of leucocytes and platelets were significantly increased (P<0.05), and PT was significantly shortened (P<0.05). All the patients showed a good response after PSE with reduced internal diameter of the portal vein and blood flow (P<0.05). Gastroesophageal varices were relieved in all the patients. Rebleeding occurred in 11 patients during the follow-up.</p><p><b>CONCLUSION</b>PSE can be effective in preventing gastroesophageal variceal rebleeding.</p>