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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
NKp461+CD3+ cells: A novel nonconventional T cell subset in cattle exhibiting both NK cell and T Cell features
Journal of Immunology, Volume 192, No. 8, Year 2014
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Description
The NKp46 receptor demonstrates a high degree of lineage specificity, being expressed almost exclusively in NK cells. Previous studies have demonstrated NKp46 expression by T cells, but NKp461+CD3+ cells are rare and almost universally associated with NKp46 acquisition by T cells following stimulation. In this study we demonstrate the existence of a population of NKp461+CD3+ cells resident in normal bovine PBMCs that includes cells of both the αβ TCR+ and γδ TCR+ lineages and is present at a frequency of 0.1-1.7%. NKp461+CD3+ cells express transcripts for a broad repertoire of both NKRs and TCRs and also the CD3ζ, DAP10, and FcεR1γ but not DAP12 adaptor proteins. In vitro functional analysis of NKp461+CD3+ cells confirm that NKp46, CD16, and CD3 signaling pathways are all functionally competent and capable of mediating/redirecting cytolysis. However, only CD3 crossligation elicits IFN-γ release. NKp461+CD3+ cells exhibit cytotoxic activity against autologous Theileria parva-infected cells in vitro, and during in vivo challenge with this parasite an expansion of NKp461+CD3 + cells was observed in some animals, indicating the cells have the potential to act as an anti-pathogen effector population. The results in this study identify and describe a novel nonconventional NKp461+CD3 + T cell subset that is phenotypically and functionally distinct from conventional NK and T cells. The ability to exploit both NKRs and TCRs suggests these cells may fill a functional niche at the interface of innate and adaptive immune responses. Copyright © 2014 by The American Association of Immunologists, Inc.
Authors & Co-Authors
Connelley, Timothy K.
United Kingdom, Edinburgh
The University of Edinburgh
Burrells, Alison C.
United Kingdom, Midlothian
Moredun Research Institute
Hope, Jayne C.
United Kingdom, Edinburgh
The University of Edinburgh
Hammond, John A.
United Kingdom, Surrey
The Pirbright Institute
Morrison, William Ivan
United Kingdom, Edinburgh
The University of Edinburgh
Statistics
Citations: 34
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.4049/jimmunol.1302464
ISSN:
00221767
Study Design
Cross Sectional Study