Effect of 1,25-dihydroxyvitamin D3 on mast cells tryptase in asthmatic guinea pigs

Objective:To explore the effect of 1,25-dihydroxyvitamin D3 on the mast cell tryptase(MCT) in asthmatic guinea pigs.Methods:A total of 60 male or female healthy guinea pigs were randomly divided into control group(group A),asthmatic group(group B).and 1,25-dihydroxyvitamin D3 group(group C),with 20 cases in each group.To establish asthmatic guinea pig models,1ml peanut oil was tilled into stomach in the morning in group A and group B.and 1 ml peanut oil with 1,25-dihydroxyvitamin D3 was filled into stomach in group C.Airway resistance(Re) of asthmatic guinea pigs was detected,and the bronchoalveolar lavage fluid(BALF) cells were counted.Lung tissue with HE and MCT immunohistochemical staining were used to observe the pathological changes in lung tissue and the distribution of MCT.Results:After injection of different concentration of acetylcholine chloride,the Re in group B and group C were increased significantly compared with group A(P<0.05):compared with group B.the Re in group C were decreased significantly(t=-5.385.-5.761.-6.184.-13.574.P<0.05):the total number of BALF cells and eosinophils were increased significantly in group B and C(t=19.618.9.598.10.854.5.388.P<0.05);compared with group B.the total number of BALF cells and eosinophils in group C was decreased significantly(t=-5.555.-5.392.P<0.05):the number of tryptase positive cells in group B was increased significantly than that in group A(t=21.312,P<0.05),and in addition to the alveolar septum and submucosa,the cells were also distributed around blood vessels and outside the cells:the number of tryptase positive cells in group C was decreased significantly compared with group B.and the difference was statistically significant(t=5.043.P<0.05).Conclusions:After the asthmatic guinea pigs arc treated with 1,25-dihydroxyvitamin D3,their BALF.Re.infiltration degree of inflammatory cells in the trachea and lung tissue and airway inflammatory reaction are reduced significantly.1,25-dihydroxyvitamin D3 has a certain inhibiting effect on the activation of mast cells and the release of MCT granules.

RGFP966通过抑制YAP通路活化减轻长时程低温保存诱导的心功能损伤

目的:观察组蛋白脱乙酰化酶3(HDAC3)抑制剂RGFP966是否能够促进低温保存心脏复灌期心功能的恢复,并探讨Hippo-YAP信号通路是否参与了RGFP966的心肌保护作用。创新点:首次证实了在Celsior保存液中添加RGFP966可以减轻长时程低温保存引起的心脏功能障碍。该研究结果为临床实践中的心脏移植提供有价值且可行的策略,为患者获得远距供体心脏提供了可能。方法:将大鼠离体心脏置于含有或不含有RGFP966的Celsior保存液中低温保存12 h后,于Langendorff灌流系统中复灌60 min,测定复灌期各项心功能指标。用Western blotting法分析Mst1和YAP蛋白表达和磷酸化水平。用TUNEL法测定心肌细胞凋亡情况。结论:RGFP966可以促进低温保存心脏复灌期心功能的恢复,其作用机制可能是通过抑制Hippo-YAP信号传导通路的激活,增强心肌抗氧化能力,抑制心肌细胞凋亡而实现的。