毒害艾美耳球虫感染对雏鸡肠道组织热休克蛋白-90 mRNA表达的影响

将90只海蓝褐雏鸡随机分为对照组、毒害艾美耳球虫（E.necatrix）一次感染组和毒害艾美耳球虫两次感染组,应用二重PCR方法,通过对肠道组织热休克蛋白-90（HSP-90）mRNA表达的检测,较全面系统地研究了毒害艾美耳球虫感染对雏鸡肠道组织HSP-90 mRNA表达的影响。结果发现,14日龄雏鸡经口第一次感染毒害艾美耳球虫后0~14d,其肠道组织HSP-90mRNA表达虽然不同程度的低于对照雏鸡,但总体呈上升趋势;上述雏鸡于28日龄时再次攻击性感染毒害艾美耳球虫,其十二指肠、空肠和回肠HSP-90 mRNA表达均呈先下降后上升,而盲肠HSP-90 mRNA表达始终呈下降趋势。28日龄雏鸡一次性大剂量感染毒害艾美耳球虫后,其十二指肠、空肠、盲肠HSP-90 mRNA表达均下降,而回肠HSP-90 mRNA表达先下降后上升。结果表明毒害艾美耳球虫感染雏鸡初期,肠道组织HSP-90 mRNA表达受到一定抑制,其表达量与肠道组织细胞损伤程度密切相关。

Low temperature stress on the hematological parameters and HSP gene expression in the turbot Scophthalmus maximus

To study the effect of low temperature stress on hematological parameters and HSP gene expression in the turbot （Seophthalmus maximus）, water temperature was lowered rapidly from 18 to 1℃. During the cooling process, three individuals were removed from culture tanks at 18, 13, 8, 5, 3, and 1℃. Blood samples and tissues were taken from each individual, hematological indices and HSP gene expression in tissues were measured. The red blood cell count, white blood cell count, and hemoglobin concentration decreased significantly （P〈0.05） as temperature decreased. Enzyme activities of plasma alanine transaminase and creatine kinase increased as temperature decreased, whereas aspartic transaminase and γ-glutamyl transpeptidase activities displayed no obvious changes above 1℃ and lactate dehydrogenase activity increased first and then decreased. Blood urea nitrogen and uric acid levels were highest at 8℃, and creatinine concentration was highest at 3℃. The concentrations of plasma cortisol, cholesterol, and triglyceride all increased significantly （P〈0.05） as temperature decreased. The serum glucose concentration increased first and then decreased to the initial level. The HSP70 mRNA expression showed various patterns in different tissues, whereas HSP90 mRNA expression showed the same tendency in all tissues. Overall, these results indicate that temperature decreases in the range of 8 to 5℃ may induce a stress response in S. maximus and that temperature should be kept above 8℃ in the aquaculture setting to avoid damage to the fish.

动态压应力对生长板软骨前体干细胞PTHrP及细胞外基质mRNA表达的影响

目的 研究动态压应力对体外培养的大鼠生长板软骨前体干细胞甲状旁腺激素相关肽（PTHrP）以及软骨特性细胞外基质mRNA表达的影响.方法 免疫磁珠分选并体外培养大鼠软骨前体干细胞,用自行设计制作的可控细胞压力加载装置对细胞进行不同强度（30 mmHg、60 mmHg、90mmHg）和持续时间（1 h、6 h、24 h）的压应力刺激,未刺激组为对照组,采用逆转录-聚合酶链反应（RT-PCR）技术分别检测各组细胞的PTHrP以及软骨特性细胞外基质（Ⅱ型胶原、X型胶原以及aggreean）mRNA表达并进行半定量分析.结果 生长板软骨前体干细胞在30 mmHg、60 mmHg、90 mmHg动态压力培养环境下,各时间点PTHrP、Ⅱ型胶原以及aggrecan mRNA表达水平明显增强并高于对照组（P〈0.05）;Ⅱ型胶原以及aggrecan mRNA表达水平于6h达高峰,PTHrP mRNA的表达水平随时间增加而增强,24 h仍有较高水平的表达;且压力值越大,相同时间点mRNA相对表达量越高.X型胶原表达水平较低且与对照组比较差异无统计学意义（P〉0.05）.结论 适当的动态压应力能有效促进体外培养的大鼠软骨前体干细胞Ⅱ型胶原及aggreean mRNA表达,PTHrP在此力学信号转导过程中可能起重要的作用.

血管紧张素转化酶2和中性氨基酸转运载体BoAT1在不同日龄猪肠道中的表达差异

研究了肠道血管紧张素转化酶2(ACE2)和中性氨基酸转运载体B0AT1在不同生长阶段猪小肠各段中的分布表达,探讨其相互关系。研究选取3日龄仔猪、90日龄生长猪和120日龄成年猪十二指肠、空肠和回肠组织,采用体外扩增和荧光定量技术对各肠段组织中ACE2和B0AT1基因进行了定性和定量分析。结果显示ACE2基因在不同日龄猪小肠各段均有表达,相对表达量随日龄增长显著升高,120日龄猪表达量极显著上调。而肠道中B0AT1相对表达量逐渐下降,120日龄时显著下调。结果提示:ACE2在成年猪肠道组织中有较高表达,B0AT1在仔猪肠道组织中表达较高。