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饲粮NFC/NDF对奶山羊瘤胃上皮细胞胰岛素样生长因子Ⅰ及其受体的基因表达的影响

DOI: 10.3969/j.issn.1006-267x.2012.10.025

Keywords: 亚急性瘤胃酸中毒,瘤胃上皮细胞,实时定量PCR,胰岛素样生长因子Ⅰ,胰岛素样生长因子Ⅰ受体

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Abstract:

本试验旨在探讨饲粮不同非纤维性碳水化合物和中性洗涤纤维比(NFC/NDF)条件下,诱导奶山羊发生亚急性瘤胃酸中毒(SARA)过程中瘤胃上皮细胞胰岛素样生长因子Ⅰ(IGF-Ⅰ)及胰岛素样生长因子Ⅰ受体(IGF-ⅠR)的基因表达量的变化。选用12只泌乳期关中奶山羊为试验动物,试验分4期进行,每期15d,依次饲喂NFC/NDF分别为1.02(Ⅰ期)、1.24(Ⅱ期)、1.63(Ⅲ期)、2.58(Ⅳ期)的4种饲粮,以逐渐增加饲粮精料的方式诱导奶山羊发生SARA,并采用实时定量PCR(qRT-PCR)法对瘤胃上皮细胞中IGF-Ⅰ及IGF-ⅠR的基因表达量的变化进行相对定量分析。结果表明:随着饲粮NFC/NDF的升高,IGF-Ⅰ及IGF-ⅠR的基因表达量均出现不同程度的增加,Ⅱ期、Ⅲ期和Ⅳ期IGF-Ⅰ的基因表达量分别是Ⅰ期的1.70、2.71和9.61倍,IGF-ⅠR的基因表达量分别是Ⅰ期的1.88、3.09和10.19倍。饲粮NFC/NDF为2.58(即SARA期)时,与Ⅰ期相比,IGF-Ⅰ和IGF-ⅠR的基因表达量均出现极显著增加(P<0.01)。结果提示,以提高饲粮NFC/NDF的方法逐渐诱导SARA,IGF-Ⅰ及IGF-ⅠR的基因表达量显著提高,SARA发生后,它们的表达量有大幅增加。

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