不同方法处理的牛心包生物相容性和钙化结果分析

目的观察脱细胞处理对牛心包体内生物相容性及钙化的影响并与戊二醛处理的牛心包进行比较;材料和方法对新鲜牛心包随机分为三组,A、戊二醛处理组:新鲜牛心包采用0.5%的戊二醛进行处理;B、新鲜牛心包组:新鲜牛心包保存于四联抗生素液中;C、脱细胞组:新鲜牛心包酶-去污剂联合脱细胞后保存于四联抗生素液中。上述处理后的牛心包经细菌培养,显示无细菌生长后,植入雄性昆明小鼠皮下三周观察炎性浸润及钙化情况。采用von Kossa钙染色检查进行定性分析;原子吸收光谱检查进行钙含量定量分析。同时体外对三组牛心包进行力学和热皱缩温度进行测试。结果三组间炎性浸润程度明显不同,0.5%的戊二醛处理组钙化程度明显增高,每克干重牛心包平均含钙量71.2mg,较其他两组有明显差异(P<0.001),新鲜牛心包组(平均2.12mg/g干重)和脱细胞组(1.41mg/g干重)间钙化程度方面亦有显著统计学意义(P<0.001)。组织学钙染色光镜下检查显示三组间黑色颗粒有明显差异,支持三组间钙含量定量结果的差异。戊二醛处理组的力学性能与优于新鲜组和脱细胞处理组,热皱缩温度高于新鲜组和脱细胞处理组。结论新鲜牛心包脱细胞处理后钙化显著降低,免疫源性降低,有很好的生物相容性。

视网膜母细胞瘤的CT诊断

目的探讨视网膜母细胞瘤的CT特征、诊断和鉴别诊断。方法回顾性分析31例(32只眼)资料完整经病理或临床证实的视网膜母细胞瘤临床和CT检查资料。结果视网膜母细胞瘤的典型临床表现为白瞳、眼球突出等,CT表现为:a)眼球后部软组织肿块;b)点状、斑片状钙化,钙化率93.8%;c)眼球突出;d)视神经增粗,眼环增厚,提示球外蔓延。结论CT对视网膜母细胞瘤的诊断及分期有重要价值,瘤体内钙化斑是视网膜母细胞瘤的特征性CT表现。

Calcium phosphate nanoparticles show an effective activation of the innate immune response in vitro and in vivo after functionalization with flagellin

For subunit vaccines,adjuvants play a key role in shaping the magnitude,persistence and form of targeted antigen-specific immune response.Flagellin is a potent immune activator by bridging innate inflammatory responses and adaptive immunity and an adjuvant candidate for clinical application.Calcium phosphate nanoparticles are efficient carriers for different biomolecules like DNA,RNA,peptides and proteins.Flagellin-functionalized calcium phosphate nanoparticles were prepared and their immunostimulatory effect on the innate immune system,i.e.the cytokine production,was studied.They induced the production of the proinflammatory cytokines IL-8 （Caco-2 cells） and IL-1β（bone marrow-derived macrophages; BMDM） in vitro and IL-6 in vivo after intraperitoneal injection in mice.The immunostimulation was more pronounced than with free flagellin.