Sialoadhesin is a macrophage-restricted, sialic acid-dependent receptor of 185 kD that binds to the oligosaccharide sequence NeuAc alpha 2,3Gal on cell surface glycoconjugates. Recent cDNA cloning has shown that sialoadhesin is a new member of the immunoglobulin superfamily with sequence similarity to CD22, a sialic acid-dependent receptor of B lymphocytes. Sialoadhesin has been implicated in cellular interactions of stromal macrophages with developing myeloid cells. In this study, direct evidence for this interaction was obtained in cell-cell binding assays using both native and recombinant forms of the protein. In all assays, sialoadhesin exhibited specific, differential binding to various murine cell populations of hemopoietic origin. In rank order, sialoadhesin bound neutrophils > bone marrow cells = blood leukocytes > lymphocytes > thymocytes. Single-cell analyses confirmed that sialoadhesin selectively bound myeloid cells in complex cell mixtures obtained from the bone marrow and blood. In comparison, a recombinant Fc-chimeric form of murine CD22 showed high binding to B and T lymphocytes, but very low binding to immature and mature myeloid cells. These results are consistent with the notion that sialoadhesin in involved in interactions with granulocytes at different stages of their life histories.
P R Crocker, S Freeman, S Gordon, S Kelm
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2020 | |
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Migratory and adhesive cues controlling innate-like lymphocyte surveillance of the pathogen-exposed surface of the lymph node: ( A ) Representative FACS plot showing IL7Rα hi Ccr6 + staining of peripheral LN cells from a Cxcr6 GFP/+ mouse, and Cxcr6-GFP intensity on the gated cells. ( B ) Representative FACS plots showing CD3ε, TCRβ and TCRγδ staining of the IL7Rα hi Ccr6 + population. Bar graph shows summary frequency data (mean ± sd) for more than 10 mice. ( C ) Intracellular FACS showing IL17 production among LN cells after 3 hr in vitro stimulation with IL1β and IL23 or phorbol 12-myristate 13-acetate and ionomycin. Graph shows summary data from 3 experiments. ( D ) Representative FACS plots showing IL17 production among popliteal LN cells 3 hr after footpad challenge with heat inactivated C. albicans, S. aureus coated bioparticles, and attenuated Y. pestis . Summary graph shows% IL17 + cells among IL7Rα hi Ccr6 + cells. ( E ) IL17 production by IL7Rα hi Ccr6 + cells in control and CD169-DTR macrophage ablated mice treated with S. aureus bioparticles as in D , Summary graph shows% IL17 + cells among IL7Rα hi Ccr6 + cells. ( F ) Il1b and Il23a mRNA level in popliteal LNs of S. aureus bioparticle challenged mice relative to controls, determined by qRT-PCR. ( G ) Summary graph to show% IL17 + cells among IL7Rα hi Ccr6 + cells between control and ASC-deficient mice after 3 hr S. aureus bioparticle challenge. ***p<0.001 by student’s t test. Data are representative of at least two experiments for panels A – C . Data are representative of two or more experiments with at least two mice per group for panels D – G . LN, Lymph node.
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