食品科学

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乳源酪蛋白糖巨肽对小鼠外周血T淋巴细胞亚群的影响

叶 雷,陈庆森*,李 伟,阎亚丽,赵 培,庞广昌,胡志和   

  1. 天津市食品生物技术重点实验室,天津商业大学生物技术与食品科学学院,天津 300134
  • 出版日期:2014-06-15 发布日期:2014-07-03

Effect of Milk-Derived Casein-Glycomacropeptide on Peripheral Blood T Lymphocyte Subsets in Mice

YE Lei, CHEN Qing-sen*, LI Wei, YAN Ya-li, ZHAO Pei, PANG Guang-chang, HU Zhi-he   

  1. Tianjin Key Laboratory of Food Biotechnology, College of Biotechnology and Food Science,Tianjin University of Commerce, Tianjin 300134, China
  • Online:2014-06-15 Published:2014-07-03

摘要:

目的:酪蛋白糖巨肽(caseino-glycomacropeptide,CGMP)是κ-酪蛋白经凝乳酶和胃蛋白酶酶解后形成的含有64 个氨基酸的不同种类肽段,具有多种生物学活性和独特的营养特性,探讨CGMP对小鼠外周血T淋巴细胞亚群的影响。方法:以健康小鼠为实验动物,利用流式细胞仪分别检测长期和短期灌胃不同剂量的CGMP(30、60、120 μg/d)后,小鼠外周血淋巴细胞亚群的变化。结果:乳源CGMP干预后的结果表明,在短期灌胃实验中,灌胃不同剂量后CD3+淋巴细胞数比例均显著降低,12 h后恢复灌胃前水平;CD3+CD4+和CD3+CD8+淋巴细胞比例在灌胃30 μg和120 μg CGMP 4 h后均显著降低,而60 μg组则无明显变化;长期灌胃实验中,在第2天和第4天,外周血中CD3+淋巴细胞和CD3+CD4+比例与对照组相比显著升高(P<0.05);120 μg/d剂量组的小鼠外周血中CD3+CD8+淋巴细胞比例与对照组相比显著升高(P<0.05),而30 μg/d剂量组在2、4、6、8 d与对照组相比无显著变化(P>0.05);在第2天,30 μg/d和120 μg/d剂量组外周血中CD3+CD4+/ CD3+CD8+比例与对照组相比显著升高(P<0.05)。结论:乳源CGMP能够引起正常小鼠的外周血淋巴细胞亚群发生变化,调节机体T淋巴细胞亚群的平衡,由此提示CGMP可作为功能性食品对外周血T淋巴细胞亚群的失衡有缓解作用。

关键词: 酪蛋白糖巨肽, 淋巴细胞亚群, CD4+细胞, CD8+细胞, 功能性食品

Abstract:

Objective: Casein glycomacropeptide (CGMP) is a kind of peptide containing 64 amino acid residues, which has
many physiological functions and unique nutritional properties. This study aimed to explore its effects on peripheral blood
lymphocyte subsets in mice. Methods: After being by gavage given different doses of CGMP (30, 60, and 120 μg/d), healthy
mice were tested for the changes of the peripheral blood lymphocyte by flow cytometry. Results: In the short-term gavage
experiment, CGMP resulted in a significant decrease in the proportion of CD3+, and after 12 h, it recovered to the level
before oral administration; CGMP at 30 and 120 μg/d resulted in a significant decrease in the proportions of CD3+CD4+
lymphocytes and CD3+CD8+ lymphocytes in peripheral blood after 4 h, while CGMP at 60 μg/d resulted in no significant
change. In the long-term gavage experiment, CGMP resulted in a significant increase in CD3+ lymphocytes and CD3+CD4+
lymphocytes in peripheral blood at days 2 and 4 (P < 0.05). Compared with the control group, CGMP at 120 μg/d resulted
in a significant increase in CD3+CD8+ lymphocytes in peripheral blood (P < 0.05), but at 30 μg/d caused no significant
increase (P > 0.05). Moreover, at day 2, CGMP at the two dosages resulted in a significant increase in CD3+CD4+/
CD3+CD8+ in peripheral blood (P < 0.05). Conclusion: CGMP can cause peripheral blood lymphocyte subsets to change
in mice, and regulate the balance of T lymphocyte subsets in peripheral blood. Therefore, CGMP can be used as a functional
food to relieve the imbalance of T lymphocyte in peripheral blood.

Key words: casein glycomacropeptide (CGMP), lymphocyte subsets, CD4+ cells, CD8+ cells, functional food