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小肽转运载体2在奶牛乳腺小肽摄取中的作用研究

DOI: 10.3969/j.issn.1006-267x.2011.08.008

Keywords: 二肽,PepT2,酪蛋白,DEPC,奶牛乳腺组织

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Abstract:

本试验旨在研究2型小肽转运载体(oligopeptidetransporter2,PepT2)在奶牛乳腺组织吸收利用小肽合成乳蛋白过程中的作用。在体外培养的奶牛乳腺组织培养液中分别添加不同浓度的苯丙氨酸二肽(Phe-Phe)(0和11.7μg/mL)和/或焦碳酸二乙酯(DEPC)(0、0.01、0.1、0.5和1.0mmol/L)进行培养,试验结束后收集乳腺组织和培养液分别用于基因表达和乳蛋白合成的检测。结果表明,Phe-Phe促进了PepT2和αs1-酪蛋白基因表达及乳蛋白合成(P<0.05);随DEPC添加浓度的升高,αs1-酪蛋白基因表达(P<0.01)和乳蛋白合成(P<0.05)显著降低;0.5mmol/LDEPC显著降低了Phe-Phe组αs1-酪蛋白的基因表达(P<0.05)和乳蛋白合成(P<0.01)以及不添加小肽组乳蛋白合成(P<0.05),但不影响不添加小肽组αs1-酪蛋白基因表达(P>0.05)。结果提示,奶牛乳腺能摄取Phe-Phe用于乳蛋白的合成,PepT2可能在乳腺小肽摄取过程中发挥重要作用。

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