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Effect of bovine skim milk and whey on monocyte function
I Politis1, X Zhao, B W McBride
1Department of Animal and Poultry Science, University of Guelph, ON, Canada.
Insights
Bovine milk inhibits lymphocyte proliferation, but this study found it does not alter monocyte function. Therefore, milk
Area of Science:
- Immunology
- Dairy Science
- Cell Biology
Background:
- Previous research indicates bovine milk suppresses lymphocyte proliferation.
- The precise mechanism of this immunosuppression remains unclear.
- Monocytes play a crucial role in regulating immune responses.
Purpose of the Study:
- To investigate if bovine skim milk and whey affect monocyte function.
- To determine if milk influences major histocompatibility complex class II (MHC-II) antigen expression on monocytes.
- To assess the impact of milk on interleukin-1 (IL-1) production by monocytes.
Main Methods:
- Monocytes were cultured with bovine skim milk or whey.
- Expression of MHC-II antigens on monocytes was analyzed.
- Production of IL-1 by monocytes was measured.
Main Results:
- Bovine skim milk and whey did not alter MHC-II expression on monocytes.
- Monocyte production of IL-1 remained unchanged in the presence of milk.
- These findings suggest milk's suppressive effect on lymphocytes is not mediated by altered monocyte MHC-II or IL-1.
Conclusions:
- The immunosuppressive effect of bovine milk on lymphocyte proliferation is unlikely to be mediated by changes in monocyte MHC-II expression or IL-1 production.
- Further research is needed to explore other monocyte-derived factors that might contribute to milk's immunomodulatory effects.
Abstract:
Previous studies have documented the ability of bovine milk to inhibit lymphocyte proliferation in response to mitogens. It is not known whether inhibition of lymphocyte proliferation is mediated through the action of monocytes. To address this question, we examined the ability of bovine skim milk and whey to affect monocyte function with emphasis on expression of major histocompatibility class II antigens and production of interleukin-1 by monocytes. Data showed that expression of major histocompatibility complex class II molecules and production of interleukin-1 by monocytes were not altered when monocytes were cultured in the presence of bovine skim milk or whey. Thus, it is unlikely that the suppressive effect of milk on lymphocyte proliferation could be mediated through alterations in the expression of major histocompatibility class II molecules or in production of interleukin-1 by monocytes. The role of other monocyte antigens or secretory products, however, should also be evaluated.
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