饲料原料价格汇总:Free Radical Res:仔猪出生氧化应激和抗氧化系统发育
来源:互联网 2014-11-16 00:52:55| 查看:次
氧化应激即指机体内氧化与抗氧化作用失衡,倾向于氧化状态。氧化应激能氧化和残害体内的脂质、蛋白质、核酸等大分子物质,从而诱导各种氧化性疾病,如糖尿病、神经退化性疾病、衰老、心脏病、帕金森综合症等。
近年来有研究掩饰,中国养猪网,人和动物出生过程也能导致胎儿产生应激反应。分娩出生过程中一个最大的特点是胎儿在子宫内通过母体介导的唤 吸骤变为子宫外完全自发依靠肺部的唤 吸。在这个过程中,胎儿从子宫内pO2为20-25mmHg的低氧环境迅速转变来 子宫外pO2为100mmHg的高氧环境中。从低氧环境骤变至高氧环境的过程中,可能会造成胎儿机体线粒体唤 吸系统产生大量的氧自由基,从而诱发氧化应激。
中国科学院亚热带农业生态研究所印遇龙研究员科研团队最近以仔猪为模型,系统地研究了出生造成的氧化应激及仔猪在出生后21天内机体抗氧化系统发育情景。结果掩饰,由于新生仔猪机体抗氧化系统薄弱,致使仔猪在出生后第一周内遭受来 严重的脂质、蛋白质和核酸的氧化残害。而随着抗氧化系统的发育,仔猪在第二周和第三周所受来 的氧化应激逐步 降低,恢复至氧化平稳 。同时,研究者们发觉,出生造成的氧化应激能够激活相关氧化信号通路,如Nrf2信号,进而反馈调剂 机体抗氧化基因的表达以及抗氧化酶的开释,最终促进抗氧化系统的发育(如图)。
该研究得来 国家自然科学基金 (31272463)和湖南省自然科学基金 (12JJ2014)等项目的资助。该研究成果已刊载于国际期刊Free Radical Research。(生物谷Bioon.com)
生物谷举荐 的英文摘要
Free Radical Research doi: 10.3109/10715762.2013.848277.
Birth oxidative stress and the development of an antioxidant system in newborn piglets.
Yin J, Ren W, Liu G, Duan J, Yang G, Wu L, Li T, Yin Y.
Abstract Birth oxidative stress is an oxidative response to a sudden transition process from maternal mediated respiration in uterus to autonomous pulmonary respiration outside the uterus. Meanwhile, oxidative stress has been demonstrated to be associated with various pathologies recorded in newborns. So, this research aimed to study the oxidative stress and the development of antioxidant system in newborn piglets. The measured variables include plasma lipid, protein and DNA oxidant injury, the activities of plasma antioxidant enzymes and the jejunal and ileal antioxidant gene expressions at 1, 7, 14, and 21 days after birth. Meanwhile, the nuclear factor erythroid 2-related factor 2 (Nrf2), transcription factor p65, and tumor protein 53 (p53) were determined by western blot. The results showed that newborn piglets suffered seriously from birth oxidative stress because of the naive antioxidant system. In addition, oxidant injury activated Nrf2 signaling pathway, resulting in the expression of antioxidant genes and release of antioxidant enzymes. With the development of antioxidant system, the oxidative balance gradually recovered on Day 7 after birth. In conclusion, birth caused oxidative stress and the oxidative balance gradually recovered with the development of antioxidant system.
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