早期乳铁蛋白干预对哺乳仔猪肌肉中抗氧化水平及细胞因子表达的影响【字数:11186】
目录
摘要 I
关键词 I
ABSTRACT II
缩略词 III
引言
第一章 文献综述 1
1乳铁蛋白的简介 1
1.1乳铁蛋白的结构特点 1
1.2乳铁蛋白的生理功能 1
1.3乳铁蛋白的代谢 1
2机体氧化应激 1
2.1 ROS与氧化应激 1
2.2动物机体的抗氧化系统 2
2.3氧化应激对动物机体的影响 2
3乳铁蛋白对氧化应激的影响 2
3.1乳铁蛋白促进铁的吸收 2
3.2乳铁蛋白抑制氧自由基的生成 3
3.3乳铁蛋白与其他微量元素结合激活辅酶 3
3.4乳铁蛋白与抗氧化基因 3
4乳铁蛋白对细胞因子的影响 3
第二章 早期乳铁蛋白干预对哺乳仔猪肌肉中抗氧化水平的影响 5
1材料与方法 5
1.1试验材料与仪器 5
1.2试验动物及试验设计 5
1.3饲养管理 6
1.4指标测定 6
1.5数据统计分析 6
2结果分析 6
3讨论 7
4小结 8
第三章 早期乳铁蛋白干预对哺乳仔猪肌肉中细胞因子表达的影响 9
1材料与方法 9
1.1试验材料与仪器 9
1.2试验动物及试验设计 9
1.3指标测定 9
1.4数据统计分析 10
2结果分析 11
3讨论 11
4小结 13
全文结论 14
存在的问题及展望 15
参考文献 16
致谢 19
早期乳铁蛋白干预对哺乳仔猪肌肉中抗氧化水平及细胞因子表达的影响
摘要
【目的】本文旨在研究早期乳铁蛋白干预对哺乳仔猪肌肉的抗氧化水平及细胞因子相关基因表达的影响。【方法】选取6窝(每窝10头)杜×长×大三元杂交的新生仔猪(初始体重为1.51 ± 0.05 kg),采用窝 *51今日免费论文网|www.jxszl.com +Q: *351916072*
内分组法将每窝仔猪分为对照组和乳铁蛋白组,每组仔猪各5头。在仔猪出生后第1至7天,每天对两组仔猪进行3次灌喂,其中乳铁蛋白组仔猪每次灌喂812 mL的乳铁蛋白溶液,使有效灌喂量达到0.5 g/kg体重/天,对照组仔猪则灌喂相同剂量的生理盐水。于第8天和第21天分别进行屠宰取样,采集仔猪背最长肌样品,用于抗氧化水平测定;同时利用RealTime PCR技术分析肌肉中细胞因子相关基因的表达。【结果】乳铁蛋白可以显著提高第8天仔猪肌肉中总抗氧化能力(TAOC)和总超氧化物歧化酶(TSOD)的含量(P < 0.05)。此外,早期乳铁蛋白干预有上调第8天试验组IL10基因相对表达量的趋势(P = 0.089);而有下调试验组TLR4、IL1α和IL1β基因相对表达量的趋势(P < 0.1)。在第21天,早期乳铁蛋白干预有上调试验组IL10基因相对表达量的趋势(P = 0.083);但对试验组IL1β基因相对表达量有下调的趋势(P = 0.66)。此外,早期乳铁蛋白干预在对第21天两组仔猪肌肉中TLR4、IL1α、IL8和TNFα的基因表达量无显著影响(P > 0.05)。【结论】乳铁蛋白能够提高哺乳仔猪的肌肉抗氧化水平,并可以调节细胞因子的基因表达水平,从而改善机体健康状况。
EFFECTS OF EARLY LIFE LACTOFERRIN INTERVENTION ON MUSCLE ANTIOXIDANT FUNCTION AND CYTOKINE EXPRESSION IN SUCKLING PIGLETS
ABSTRACT
[Objective] The aim of this study was to investigate the effects of early life lactoferrin (LF) intervention on the antioxidant function and the cytokine gene expression in muscle of suckling piglets. [Methods] A total of 6 litters (10 piglets per litter) neonatal piglets with similar average body weight (1.51 ± 0.05 kg) were used in this study. The piglets were assigned to the control group and LF group with the similar body weight in each litter to avoid maternal differences. Five piglets in each litter were orally administrated with LF solution three times a day to reach the level of 0.5 g/kg/d. Another 5 piglets were orally administrated with the same dose of physiological saline. Six piglets from each group were euthanized, and longissimus muscle samples were collected for antioxidant function and Realtime PCR analysis on the day 8 and day 21. [Results] The results showed that the early life LF intervention significantly increased the total antioxidant capacity (TAOC) and total superoxide dismutase (TSOD) levels in muscles of suckling piglets on day 8 (P < 0.05). Moreover, LF tended to upregulate gene expression of IL10 on day 8 (P < 0.1). Besides, the LF piglets had a decreased tendency for gene expression of TLR4, IL1α and IL1β on day 8 (0.05 < P < 0.1). On day 21, compared with the control group, the early life LF intervention tended to upregulate the gene expression of IL10 and downregulate the gene expression of IL1β (0.05 < P < 0.1). [Conclusion] These results suggest that the early life LF intervention can enhance antioxidant function and regulate the gene expression of cytokines, which would be beneficial to the healthy development of suckling piglets.
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