Redefining myeloid cell subsets in murine spleen

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Abstract

Spleen is known to contain multiple dendritic and myeloid cell subsets, distinguishable on the basis of phenotype, function and anatomical location. As a result of recent intensive flow cytometric analyses, splenic dendritic cell (DC) subsets are now better characterised than other myeloid subsets. In order to identify and fully characterise a novel splenic subset termed 'L-DC' in relation to other myeloid cells, it was necessary to investigate myeloid subsets in more detail. In terms of cell surface phenotype, L-DC were initially characterised as a CD11bhiCD11cloMHCII−Ly6C−Ly6G− subset in murine spleen. Their expression of CD43, lack of MHCII, and a low level of CD11c was shown to best differentiate L-DC by phenotype from conventional DC subsets. A complete analysis of all subsets in spleen led to the classification of CD11bhiCD11cloMHCII−Ly6CloLy6G− cells as monocytes expressing CX3CR1, CD43 and CD115. Siglec-F expression was used to identify a specific eosinophil population, distinguishable from both Ly6Clo and Ly6Chi monocytes, and other DC subsets. L-DC were characterised as a clear subset of CD11bhiCD11cloMHCII−Ly6C−Ly6G− cells, which are CD43+, Siglec-F− and CD115−. Changes in the prevalence of L-DC compared to other subsets in spleens of mutant mice confirmed the phenotypic distinction between L-DC, cDC and monocyte subsets. L-DC development in vivo was shown to occur independently of the BATF3 transcription factor that regulates cDC development, and also independently of the FLT3L and GM-CSF growth factors which drive cDC and monocyte development, so distinguishing L-DC from these commonly defined cell types.

Oral Abstract Session #1007
Original languageEnglish
Article number1007
Pages (from-to)249
Number of pages1
JournalEuropean Journal of Immunology
Volume46
Issue numberS1
DOIs
Publication statusPublished - Aug 2016
EventThe 16th International Congress of Immunology - Melbourne Convention and Exhibition Centre, Melbourne, Australia
Duration: 21 Aug 201626 Aug 2016
Conference number: 16th
http://www.immunology.org.au/events/international-congress-immunology-2016/

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