title: Postpartal immunometabolic gene network expression and function in blood neutrophils are altered in response to prepartal energy intake and postpartal intramammary inflammatory challenge.
abstract: The effect of over-feeding energy prepartum on blood polymorphonuclear neutrophil (PMN) response remains unclear. Cows fed controlled (CON; 1.34Mcal/kg of dry matter) or excess energy (OVE; 1.62Mcal/kg dry matter) during the dry period (~45d before expected calving date) received an intramammary (IM) challenge with Escherichia coli lipopolysaccharide (LPS) during the postpartal period to determine the effects of IM LPS and prepartal diet on the expression of key genes associated with immunometabolic response in blood PMN. Feed intake and daily milk yield were recorded throughout the study period. At 7d in milk (DIM), all cows received LPS (200µg) into 1 rear mammary quarter. Blood PMN were isolated at 7, 14, and 30 DIM, as well as before (0h) and after (12h) IM LPS challenge for gene expression analysis using quantitative real time PCR. Phagocytosis capabilities in vitro were assessed at 7, 14, and 30 DIM. Data were analyzed using the MIXED procedure of SAS with repeated measures. No differences in feed intake and milk yield were observed between OVE- and CON-fed cows. As expected, IM LPS challenge altered the expression of genes associated with the immune response (e.g., 1.9- and 1.8-fold for SELL and TLR2, respectively), metabolism (e.g., 1.8- and -1.8-fold for LDHA and SLC2A1, respectively), and transcription (e.g., 1.1- and 1.7-fold for NCOR1 and PPARD, respectively). At 12h postchallenge, an upregulation of TLR2 (1.8-fold), HIF1A (1.9-fold), and NFKB1 (1.5-fold) was observed for OVE rather than CON. At 7 DIM, S100A9 tended (2.2-fold) to be upregulated for OVE rather than CON. At 14 DIM, OVE resulted in lower PMN phagocytosis and an upregulation of NCOR2 (1.6-fold) and RXRA (1.9-fold) compared with CON-fed cows. At 30 DIM, an upregulation of MPO (3.5-fold) and PLA2G4A (1.5-fold) and a tendency for RXRA (1.7-fold) was observed for OVE- rather than CON-fed cows. Our results suggest that IM LPS challenge altered gene expression associated with metabolism in PMN and that OVE impaired PMN phagocytosis and increased the expression of immunometabolic genes after IM LPS challenge and during the postpartal period. The current study provides new linkages among prepartal feed energy intake, metabolism, and immune response of blood PMN and risk of disease during early lactation.
authors: Department of Animal and Avian Sciences, University of Maryland, College Park 20742. Electronic address: kmoyes@umd.edu.
authors: K M
authors: KM
authors: Moyes
authors: Mammalian NutriPhysioGenomics, and University of Illinois, Urbana 61801; Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana 61801.
authors: D E
authors: DE
authors: Graugnard
authors: Mammalian NutriPhysioGenomics, and University of Illinois, Urbana 61801; Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana 61801.
authors: M J
authors: MJ
authors: Khan
authors: National Bureau of Animal Genetic Resources, P.B. 129, GT Road Bye Pass, Karnal-132001, Haryana, India.
authors: M
authors: M
authors: Mukesh
authors: Mammalian NutriPhysioGenomics, and University of Illinois, Urbana 61801; Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana 61801. Electronic address: jloor@illinois.edu.
authors: J J
authors: JJ
authors: Loor
mesh_terms: D000818:Animals; D002417:Cattle / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D004032:Diet; D002149:Energy Intake; D004926:Escherichia coli / Q000502:physiology; D005260:Female; D005786:Gene Expression Regulation; D053263:Gene Regulatory Networks; D008070:Lipopolysaccharides / Q000008:administration & dosage; D008321:Mammary Glands, Animal / Q000382:microbiology; D009504:Neutrophils / Q000276:immunology / Q000378:metabolism*; D011897:Random Allocation
chemical_list: D008070:Lipopolysaccharides
keywords: blood neutrophil immune response; intramammary inflammatory challenge; prepartal feed energy intake