Leptospirosis is an important zoonosis with worldwide distribution. As the first procedure in immunity system, the role and significance of innate immunity in controlling infection at the early stage of the disease have gradually been emphasized. Macrophages can phagocytize and kill leptospira, while the pathogenic leptospira can evade the killing by macrophages. In addition, neutrophils, complement system and cytokines also contribute to the defence of leptospira infection.

Immune cells that undergo increased apoptosis include lymphocytes and macrophages,yet the apoptosis of neutrophils is decreased in sepsis.Increase in apoptosis has also been reported in non-immune cells such as gastrointestinal cells,epithelial cells of lung as well as endothelial cells.The altered apoptotic cell death may contribute to the initiation and aggravation of immune and organ dysfunction in sepsis.Elucidating the changes and mechanism of apoptosis and taking measures to control apoptosis may be an effective strategy for the treatment of sepsis.

Objective To investigate the mechanisms of phagocytosis of virulent Leptospira by peritoneal macrophages of guinea pigs,andevaluatetheroleof innateimmuneinthepathogenesisof leptospirosis. Methods Peritoneal macrophages of guinea pigs were extracted. Three specific inhibitors ( microfilament inhibitor cytochalasin D,microtube inhibitor colchicine and PI3K signalling pathway inhibitor LY294002) were added respectively to the macrophages 1 h before the infection of virulent Leptospira interrogans serovar Lai type strain Lai in vitro.Meanwhile, control group without inhibitor was established.Phagocytosis was observed by laser scanning confocal microscopy and phagocytic rates were evaluated by flow cytometry 3 h after infection.ResultsThe phagocytic rates of control group, cytochalasin D group, colchicine group and LY294002 group were (38.98 ± 0.91)%,(23. 99 ± 1. 40) % ,(40.81±0.91)% and (39.64 ±3.56) %, respectively.The phagocytic rate of cytochalasin D group was significantly lower than that of control group (P < 0. 05), while those of colchicine group and LY294002 group were not significantly different from that of control group (P >0.05). ConclusionMicrofilaments play an important role in the phagocytosis of strain Lai by peritoneal macrophages,but the process is independent on PI3K signalling pathway,and microtubes play little part during the phagocytosis.

BackgroundMindful parenting is related to the physical and mental health of adolescents， but only few empirical studies have been conducted on the mindful parenting and none has addressed on the impact and actor-partner effects of mindful parenting on adolescents' aggressive behaviors via parenting stress. ObjectiveTo explore the impact and actor-partner effects of mindful parenting on adolescents' aggressive behaviors via parenting stress， so as to provide references for improvements in family education and interventions on behavioral problems in adolescents. MethodsA sample of 907 subjects （including family members and students） from three classes in each of five grades from grade 5 in elementary school to grade 9 in junior high school in Mianyang， Sichuan Province were selected from September 8 to 15， 2023. Parents were assessed with Mindfulness In Parenting Questionnaire （MIPQ） and Parenting Stress Index-Short Form （PSI-SF）， and students were required to fulfill aggressive behavior scale of Youth Self-Report （YSR）. Pearson correlation analysis was utilized to examine the correlation among the above scales. The actor-partner interdependence model was used to analyze the impact of mindful parenting on their own and their spouses' parenting stress， as well as the impact on adolescents' aggressive behaviors via parenting stress. ResultsA total of 472 families completed the effective questionnaires. Both father and mother's mindful parenting exhibited an actor effect on adolescents' aggressive behaviors via their own parenting stress， with the effect size of -0.018 （P=0.002） and -0.026 （P=0.012）. The partner effect sizes of father's mindful parenting and mother's mindful parenting on adolescents' aggressive behaviors via their spouse's parenting stress were -0.006 （P=0.026） and -0.007 （P=0.012）， respectively. ConclusionMindful parenting has been proven to have specific indirect impact on adolescents' aggressive behaviors through their own and their spouse's parenting stress， and the actor effect and partner effect are found both significant. ［Funded by Key Project of National Education Science Planning and Ministry of Education （number， DBA220439）］