项目名称: 一氧化氮(NO)介导的藏猪低氧适应的血液动力学生理及分子机制
项目编号: No.30860182
项目类型: 地区科学基金项目
立项/批准年度: 2009
项目学科: 金属学与金属工艺
项目作者: 严达伟
作者单位: 云南农业大学
项目金额: 25万元
中文摘要: 课题通过三年实施,取得主要成果如下: (1)揭示藏猪在高海拔低氧条件下保持正常心功能和肺动脉压。 高原藏猪天生心律不齐、二尖瓣VE/VA<1、主动脉瓣峰值流速高,肺动脉压正常;移居高原的杜洛克猪每搏量的代偿性增大,满足机体对氧的需求从而适应高原低氧环境。 (2)揭示藏猪具有高的毛细血管密度,VEGF可能参与调控。 高原低氧可上调心肺部VEGF的表达,微血管数量增多,改善组织的供氧。这是高原藏猪低氧适应的重要机制。 (3)发现藏猪低氧适应相关45个候选功能位点 筛选到藏猪非编码SNP共44个,错义突变1个,为第1121个氨基酸由Ala突变为Ser。 (4)揭示藏猪目标基因低氧适应性表达谱 低氧上调EPAS1、eNOS基因的mRNA表达水平是藏猪低氧适应的重要机制,但eNOS的mRNA表达量与免疫组化结果不相符,有待验证。 (5)发表SCI论文3篇,培养硕士研究生2名。
中文关键词: 藏猪;低氧适应;NOS;EPAS1;血流
英文摘要: The main results are listed as follows through constant practice for three years. (1) Reavealed a normal heart function and a normal pulmonary artery pressure for Tibetan pig even though under hypoxia. Unexpectedly, arrhythmia occurred in Tibetan pig and the VE/VA was less than 1. the immigrated pig possessed compensatory increase of stroke volume to adapt to hypoxia. (2) The capillary density was increased by regulation of VEGF gene. The number of capillary is proportional to loading ability of blood, which is an important mechanism of hypoxia adaptation in Tibetan pig. (3) finding 45 candidate functional sites, including 44 noncoding sites and 1 missense mutation, Ala/Ser. (4) revealed selective expression profile of EPAS1, NOS and VEGF gene. The hypoxia upregulation of EPAS1 and eNOS is important mechanism of hypoxia adaptation in Tibetan pig. However, the results of QPCR and immunohistochemisty conflicted in eNOS. (5) Publishing 3 SCI papers and cultivating 2 postgraduates.
英文关键词: Tibetan pig; hypoxia; NOS; EPAS1; Blood stream