压力超负荷对大鼠心肌高能磷酸盐代谢的影响

目的探讨压力超负荷大鼠肥厚心肌高能磷酸盐含量及分布变化的特点。方法成年雄性SD大鼠行腹主动脉缩窄术,术后5周及15周观察大鼠血流动力学参 数、心室重构指标,密度梯度法提取大鼠心肌线粒体,高效液相色谱法测量心肌组织及心肌线粒体高能磷酸盐含量。结果大鼠腹主动脉缩窄术后5周出现左心室肥厚,术后15周加重并有心功能减退;CAA5周组与CAA15周组心肌组织ATP、ADP、AMP及总腺苷酸池含量均降低,且CAA15周组心肌PCr降低,其总腺苷酸池及ATP含量低于CAA5周组;CAA15周组线粒体内ATP、ADP、AMP及总腺苷酸池含量降低。结论压力超负荷可影响心肌高能磷酸盐的含量和分布,肥厚心肌组织能量消耗增多且能量产生及储备均不足,可能是心肌发生肥厚及心功能异常的机制之一。     

高能量加速型角膜胶原交联术对圆锥角膜眼表的影响

目的 探讨圆锥角膜患者角膜胶原交联术前后眼表的变化规律.方法 选取诊断为圆锥角膜符合纳入、排除标准,且知情同意后接受行高能量加速型角膜交联术的患者42例(60眼).以眼为单位,根据Kmax分3个组(轻度圆锥角膜组、中度圆锥角膜组、重度圆锥角膜组);根据K2与K1差值即散光分为3个组,A组(0≤K2-K1≤2.5D),B...     

Phytate Hydrolysate Differently Modulates the Immune Response of Human Healthy and Cancer Colonocytes to Intestinal Bacteria

(1) Phytic acid (PA) is a component of cereal seeds and legumes, therefore its consumption is much higher in a vegan and vegetarian diet compared to a conventional diet. The diet is the main driver of metabolic activity of gut microbiota, therefore, the ability to degrade phytates by the microbiota of vegans significantly exceeds that of the gut microbiota of omnivores. The aim of the study was to investigate the early phase of the immune response of colonocytes treated with an enzymatic hydrolysate of phytic acid (hPA120) and gut bacteria. (2) Cell lines derived from healthy (NCM460D) and cancer (HCT116) colonic tissue and fecal bacteria from vegan (V) and omnivorous (O) donors were investigated. Fecal bacteria were grown in mucin and phytic acid supplemented medium. Cultured bacteria (BM) were loaded onto colonocytes alone (V BM and O BM) or in combination with the phytate hydrolysate (V BM + hPA120 and O BM + hPA120). After a treatment of 2 h, bacterial adhesion, secretion of cytokines, and the expression of genes and proteins important for immune response were determined. (3) All bacteria-treated colonocytes increased the expression of IL8 compared to controls. The significant increase of the secreted IL-8 (p < 0.01) in both cell lines was observed for O BM and O BM + hPA120. The increase of TNF, IL-1β, and IL-10 secretion in healthy colonocytes (V BM alone and with hPA120 treatments; p < 0.05) and for TNF and IL-10 in cancer cells (treatments except O BM + hPA120 and V BM, respectively; p > 0.05) were stated. A comparison of solely the effect of hPA120 on bacteria-treated colonocytes (BM vs. BM + hPA120) showed that hPA120 decreased expression of NFkB1 and TNFR (p < 0.001) in healthy colonocytes. In cancer colonocytes, the expression of TLR4 and IL1R increased after BM + hPA120 treatment, whereas the secretion of IL-8 and MYD88 and TNFR expression decreased (p < 0.01). (4) The investigated hPA120 showed a differentiated modulatory activity on the immune response of healthy and cancer human colonocytes. Especially when analyzed independently on the gut bacteria origin, it reduced the proinflammatory response of HCT116 cells to gut bacteria, while being neutral for the bacteria-treated healthy colonocytes.