title: Phenotypic and functional analysis of monocyte populations in cattle peripheral blood identifies a subset with high endocytic and allogeneic T-cell stimulatory capacity.
abstract: Circulating monocytes in several mammalian species can be subdivided into functionally distinct subpopulations based on differential expression of surface molecules. We confirm that bovine monocytes express CD172a and MHC class II with two distinct populations of CD14(+)CD16(low/-)CD163(+) and CD14(-)CD16(++)CD163(low-) cells, and a more diffuse population of CD14(+)CD16(+)CD163(+) cells. In contrast, ovine monocytes consisted of only a major CD14(+)CD16(+) subset and a very low percentage of CD14(-)CD16(++)cells. The bovine subsets expressed similar levels of CD80, CD40 and CD11c molecules and mRNA encoding CD115. However, further mRNA analyses revealed that the CD14(-)CD16(++) monocytes were CX3CR1(high)CCR2(low) whereas the major CD14(+) subset was CX3CR1(low)CCR2(high). The former were positive for CD1b and had lower levels of CD11b and CD86 than the CD14(+) monocytes. The more diffuse CD14(+)CD16(+) population generally expressed intermediate levels of these molecules. All three populations responded to stimulation with phenol-extracted lipopolysaccharide (LPS) by producing interleukin (IL)-1β, with the CD16(++) subset expressing higher levels of IL-12 and lower levels of IL-10. The CD14(-)CD16(++) cells were more endocytic and induced greater allogeneic T cell responses compared to the other monocyte populations. Taken together the data show both similarities and differences between the classical, intermediate and non-classical definitions of monocytes as described for other mammalian species, with additional potential subpopulations. Further functional analyses of these monocyte populations may help explain inter-animal and inter-species variations to infection, inflammation and vaccination in ruminant livestock.
authors.affiliation: Division of Infection & Immunity, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK. Yolanda.Corripio-Miyar@moredun.ac.uk.
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Corripio-Miyar
authors.affiliation: Division of Infection & Immunity, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK. Jayne.Hope@roslin.ed.ac.uk.
authors.forename: Jayne
authors.initials: J
authors.lastname: Hope
authors.affiliation: Current address: Moredun Research Institute, Pentlands Science Park, Bush Loan, Midlothian, EH26 0PZ, UK. Colin.McInnes@moredun.ac.uk.
authors.forename: Colin J
authors.initials: CJ
authors.lastname: McInnes
authors.affiliation: Current address: Moredun Research Institute, Pentlands Science Park, Bush Loan, Midlothian, EH26 0PZ, UK. Sean.Wattegedera@moredun.ac.uk.
authors.forename: Sean R
authors.initials: SR
authors.lastname: Wattegedera
authors.affiliation: Division of Infection & Immunity, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK. Kirsty.Jensen@roslin.ed.ac.uk.
authors.forename: Kirsty
authors.initials: K
authors.lastname: Jensen
authors.affiliation: Current address: Moredun Research Institute, Pentlands Science Park, Bush Loan, Midlothian, EH26 0PZ, UK. Yvonne.Pang@moredun.ac.uk.
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Pang
authors.affiliation: Division of Infection & Immunity, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK. Gary.Entrican@moredun.ac.uk.|Current address: Moredun Research Institute, Pentlands Science Park, Bush Loan, Midlothian, EH26 0PZ, UK. Gary.Entrican@moredun.ac.uk.
authors.forename: Gary
authors.initials: G
authors.lastname: Entrican
authors.affiliation: Division of Infection & Immunity, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian, EH25 9RG, UK. Liz.Glass@roslin.ed.ac.uk.
authors.forename: Elizabeth J
authors.initials: EJ
authors.lastname: Glass
mesh_terms: D000818:Animals; D002417:Cattle / Q000097:blood*; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005434:Flow Cytometry / Q000662:veterinary; D009000:Monocytes / Q000276:immunology / Q000378:metabolism*; D022423:Myeloid Cells / Q000378:metabolism*; D016133:Polymerase Chain Reaction / Q000662:veterinary; D013601:T-Lymphocytes / Q000276:immunology*