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Proinflammatory cytokines in bovine colostrum potentiate the mitogenic response of peripheral blood mononuclear cells from newborn calves through IL-2 and CD25 expression.

Microbiol. Immunol.2003;47(6):461-8. doi:10.1111/j.1348-0421.2003.tb03371.x
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摘要


Abstract: Bovine colostrum contains high concentrations of cytokines, and colostral cytokines are considered to be an important factor in stimulation of maturation of the immune system in newborns. In this study, 5 proinflammatory cytokines (IL-1beta, IL-6, TNF-alpha, IFN-gamma and IL-1 receptor antagonist, IL-1ra) present in colostrum were tested for their potential to enhance mitogenic response and to elicit expression of IL-2 mRNA and CD25 in peripheral blood mononuclear cells (PBMC) from newborn calves before being fed colostrum. PBMC were pretreated with each recombinant bovine cytokine for 2 hr before stimulation with concanavalin A (ConA). Pretreatment of PBMC from newborn calves with IL-1beta, TNF-alpha or IFN-gamma significantly enhanced the ConA response, whereas IL-1ra inhibited the response. The degree of enhancement or inhibition of mitogenic response by these cytokines was more pronounced in PBMC from newborn calves than in those from adult cows. Although IL-2 mRNA expression in ConA-stimulated PBMC from newborn calves was weaker than that in those from adult cows of ConA-stimulated controls, the expression levels became comparable after pretreatment with IL-1beta, TNF-alpha or IFN-gamma. The CD25 expression in PBMC from newborn calves was also enhanced by pretreatment with IL-1beta, TNF-beta and IFN-gamma. These results suggest that pretreatment of neonatal PBMC with IL-1beta, TNF-alpha or IFN-gamma promotes mitogenic response to ConA through up-regulating the production of IL-2 and the expression of the mature IL-2 receptor.

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