Heterogeneity of respiratory dendritic cell subsets and lymphocyte populations in inbred mouse strains.
BACKGROUND
Inbred mouse strains are used in different models of respiratory diseases but the variation of critical respiratory leukocyte subpopulations across different strains is unknown.


METHODS
By using multiparameter flow cytometry we have quantitated respiratory leukocyte subsets including dendritic cells subpopulations, macrophages, classical T and B cells, natural killer cells, γδTCR+ T cells and lineage-negative leukocytes in the five most common inbred mouse strains BALB/c, C57BL/6, DBA/2, 129SV and C3H. To minimize confounding environmental factors, age-matched animals were received from the same provider and were housed under identical specific-pathogen-free conditions.


RESULTS
Results revealed significant strain differences with respect to respiratory neutrophils (p=0.005; up to 1.4 fold differences versus C57BL/6 mice), eosinophils (p=0.029; up to 2.7 fold), certain dendritic cell subsets (p≤0.0003; up to 3.4 fold), T (p<0.001; up to 1.6 fold) and B lymphocyte subsets (p=0.005; up to 0.4 fold), γδ T lymphocytes (p=0.003; up to 1.6 fold), natural killer cells (p<0.0001; up to 0.6 fold) and lineage-negative innate leukocytes (p≤0.007; up to 3.6 fold). In contrast, total respiratory leukocytes, macrophages, total dendritic cells and bronchoalveolar lavage leukocytes did not differ significantly. Stimulation of respiratory leukocytes via Toll-like receptor 4 and 9 as well as CD3/CD28 revealed significant strain differences of TNF-α and IL-10 production.


CONCLUSIONS
Our study demonstrates significant strain heterogeneity of respiratory leukocyte subsets that may impact respiratory immunity in different disease models. Additionally, the results may help identification of optimal strains for purification of rare respiratory leukocyte subsets for ex vivo analyses.
Institute for Clinical Immunology and Transfusion Medicine, Justus-Liebig-University Giessen, Member of the German Center for Lung Research, Langhansstr 7, D-35390, Giessen, Germany. Holger.Hackstein@immunologie.med.uni-giessen.de
Holger
H
Hackstein
Andreas
A
Wachtendorf
Sabine
S
Kranz
Jürgen
J
Lohmeyer
Gregor
G
Bein
Nelli
N
Baal
D000818:Animals; D015703:Antigens, CD / Q000378:metabolism; D001402:B-Lymphocytes / Q000276:immunology* / Q000378:metabolism / Q000473:pathology*; D018893:Bronchoalveolar Lavage; D002452:Cell Count; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism / Q000473:pathology*; D016753:Interleukin-10 / Q000378:metabolism; D007694:Killer Cells, Natural / Q000378:metabolism / Q000473:pathology; D016131:Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D016676:Macrophages, Alveolar / Q000378:metabolism / Q000473:pathology; D051379:Mice; D057507:Mice, 129 Strain; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism / Q000473:pathology*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
D015703:Antigens, CD; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10