Bovine Monocyte-Derived Dendritic Cell Populations from Animals in Late Gestation Show Altered Response to E. Coli
The journal of immunology/The Journal of immunology(2014)
摘要
Abstract During late gestation the bovine immune system is less capable of eliminating pathogens. Most new intra-mammary infections occur in late gestation, and the majority of these infections are caused by E. coli. Unlike non-pregnant, lactating cows, late gestation cows are unable to elicit an effective inflammatory response to intra-mammary infection caused by E. coli. During pregnancy, the immune system appears to shift to a humoral, anti-inflammatory, so called T helper 2 bias with increased tolerance. Dendritic cells are antigen presenting cells that orchestrate activation and differentiation of naive T cells, and they are hypothesized to play a key role in directing the T helper 2 bias and immune tolerance observed in gestation. We stimulated monocyte-derived dendritic cells with E. coli and compared responses from late gestation cows to those of non-pregnant cows. Results show monocyte-derived dendritic cells from late gestation cows have altered surface molecule expression and cytokine production compared to those from non-pregnant cows. Our findings support the hypothesis that late gestation bovine dendritic cells are likely to produce suboptimal T cell activation in response to E. coli antigens, and play a role in observed immune-bias in pregnancy. In addition, altered dendritic cell function in gestation may impede current, routine vaccination regiments in late gestation. Future work will identify likely pregnancy-factors that modulate bovine dendritic cell responses.
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