Objective To test the inhabiting effect of Lactobacillus acidophilus on E.coli O157: H7 in intestinal colonization and explore its mechanism. Methods The suppressive effects of Lactobacillus acidophilus against E.coli O157:H7 adhering to Ht29 cells were carried out by competition , exclusion and replacement as-says. Furthermore, we evaluated the cytokine levels of IL-4, IL-12, and INF-γ in serum of mice. In addition, E.coli O157:H7 fecal shedding was monitored and the pathological changes of intestines were observed in mice. Results The competition, exclusion and replacement assays showed Lactobacillus acidophilus inhibited E.coli O157:H7 adhering to Ht29 cells. In vivo, the mice of treatment group were induced significantly higher level of IL-4, IL-12, and INF-γ, though prevention group induced IL-12 only. Fifteen days after E.coli O157:H7 infec-tion, there were 8 mice (80%) in prevention group and 5 mice (50%) in treatment group stopped shedding. Moreover, the pathological changes of intestines of both prevention group and treatment group appeared normal , but control groups showed seriously damaged in intestinal villus. Conclusion Lactobacillus acidophilus inhibits E.coli O157:H7 in intestinal colonization and the preventative effect was better than treatment effect. Thus , Lac-tobacillus acidophilus can be used for E.coli O157:H7 in prevention and treatment infection as probiotics.

Objective To investigate the clinical characteristics in patients with primary antiphospholipid syndrome (PAPS) and to identify potential predictors of thrombotic events.Methods A total of 107 patients with PAPS were enrolled in our study, who were admitted in Peking Union Medical College Hospital from January 2004 to December 2014.Demographic data, age at onset, disease duration, past history of hypertension and regular cigarette smoking, clinical manifestations, imaging characteristics, management and prognosis were retrospectively collected.Bivariate statistical analysis and logistical regression test were performed to compare the discrepancy between patients with or without thromboembolic events.Results In 107 patients, there were 65 female and 42 male patients, with mean age (39.8 ± 15.8) years old, median disease duration 10.5 (2.0, 48.0) months.A total of 72(67.3％) patients reported episodes of thromboembolic events, including 72 venous thromboses and 29 arterial thromboses.The most frequent venous thromboses were deep vein thromboses (35.5％), pulmonary embolism the second common (29.9％), with cranial venous sinus thromboses the following (8.4％).In arterial thromboembolic events, the incidence of transient ischemic attack (TIA) and ischemic stoke was the highest (14.0％), embolism of lower extremities the second (6.5％) ,and 4 patients (3.7％) with acute myocardial infarction.Sixty seven patients (62.6％)had positive lupus anticoagulant, 60 patients (56.1％)with positive anticardiolipin antibody,32 patients (29.9％, 32/74) with positive β2 glycoprotein Ⅰ (β2GP I).Forty patients(37.4％)had double positive antibodies, while 19 cases (17.8％)with triple positive.In logistical regression, aging (per 10 years) and hypocomplementemia were significantly related to venous thrombosis (OR =1.421, 95％ CI 1.066-1.894, P ＜ 0.05, and OR =6.435, 95％ CI 1.374-30.130, P ＜ 0.05, respectively).Cigarette smoking and triple positive antibodies were independent risk factors of arterial thrombosis (OR =3.996, 95％ CI 1.079-14.795, P ＜ 0.05 and OR =3.166, 95％ CI 1.102-9.097, P ＜ 0.05, respectively).Conclusion Alas is an autoimmune disorder characterized by recurrent arterial and venous thromboembolic events.Venous thromboembolism is more common than the arterial.Age and hypocomplementemia are predictors of venous thromboembolism;while smoking and triple positive antibodies are independent risk factors of arterial thromboembolism.

An 61-year-old woman presenting deep vein thrombosis and persistent positive anticardiolipin antibodies was diagnosed as antiphospholipid syndrome and treated with low molecular weight heparin. Before and after anticoagulant therapy, continuous positive fecal occult-blood was found asymptomatically. Colonoscopy confirmed rectal cancer. Antiphospholipid autoantibodies are non-specially positive in some malignances, especially in elder onset patients. Thus, routine screening of malignancies is strongly suggested.