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Issue 9, 2014
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Immunomodulating effects of casein-derived peptides QEPVL and QEPV on lymphocytes in vitro and in vivo

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Abstract

Lymphocytes serve an important function in mediating specific immune responses. When the body is stimulated by internal or external antigens, activated lymphocytes proliferate to clear pathogens by secreting antibodies or cytokines. Some bioactive peptides were isolated from fermented milk in previous studies. One of the peptides, Gln-Glu-Pro-Val-Leu (QEPVL), was synthesized and used in this experiment. Results show that QEPVL can significantly activate lymphocytes both in vitro and in vivo. QEPVL can also increase the lymphocyte proliferation rate and cyclic AMP levels. This positive regulation had a dose–effect relationship within certain concentration ranges. QEPVL can also inhibit LPS-induced inflammation by regulating nitric oxide release and the production of the cytokines IL-4, IL-10, IFN-γ, and TNF-α in vivo. Digesting QEPVL in artificial gastrointestinal juice yields the digestion product Gln-Glu-Pro-Val (QEPV), which exhibits bioactivities similar to those of QEPVL in vitro. Overall, QEPVL has significant immunomodulating effects on lymphocytes and contributes to inflammation treatment through the oral route as a functional food ingredient.

Graphical abstract: Immunomodulating effects of casein-derived peptides QEPVL and QEPV on lymphocytes in vitro and in vivo

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Article information


Submitted
05 Dec 2013
Accepted
23 May 2014
First published
30 May 2014

Food Funct., 2014,5, 2061-2069
Article type
Paper
Author version available

Immunomodulating effects of casein-derived peptides QEPVL and QEPV on lymphocytes in vitro and in vivo

Z. Jiehui, M. Liuliu, X. Haihong, G. Yang, J. Yingkai, Z. Lun, D. X. An Li, Z. Dongsheng and Z. Shaohui, Food Funct., 2014, 5, 2061
DOI: 10.1039/C3FO60657K

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