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Subcapsular sinus macrophages in lymph nodes clear lymph-borne viruses and present them to antiviral B cells.
- Source :
-
Nature [Nature] 2007 Nov 01; Vol. 450 (7166), pp. 110-4. Date of Electronic Publication: 2007 Oct 14. - Publication Year :
- 2007
-
Abstract
- Lymph nodes prevent the systemic dissemination of pathogens such as viruses that infect peripheral tissues after penetrating the body's surface barriers. They are also the staging ground of adaptive immune responses to pathogen-derived antigens. It is unclear how virus particles are cleared from afferent lymph and presented to cognate B cells to induce antibody responses. Here we identify a population of CD11b+CD169+MHCII+ macrophages on the floor of the subcapsular sinus (SCS) and in the medulla of lymph nodes that capture viral particles within minutes after subcutaneous injection. Macrophages in the SCS translocated surface-bound viral particles across the SCS floor and presented them to migrating B cells in the underlying follicles. Selective depletion of these macrophages compromised local viral retention, exacerbated viraemia of the host, and impaired local B-cell activation. These findings indicate that CD169+ macrophages have a dual physiological function. They act as innate 'flypaper' by preventing the systemic spread of lymph-borne pathogens and as critical gatekeepers at the lymph-tissue interface that facilitate the recognition of particulate antigens by B cells and initiate humoral immune responses.
- Subjects :
- Animals
Antibody Formation immunology
CD11b Antigen metabolism
Cell Line
Lymph Nodes cytology
Macrophages metabolism
Membrane Glycoproteins metabolism
Mice
Mice, Inbred C57BL
Receptors, Immunologic metabolism
Sialic Acid Binding Ig-like Lectin 1
B-Lymphocytes immunology
Lymph virology
Lymph Nodes immunology
Lymph Nodes virology
Macrophages immunology
Vesiculovirus immunology
Subjects
Details
- Language :
- English
- ISSN :
- 1476-4687
- Volume :
- 450
- Issue :
- 7166
- Database :
- MEDLINE
- Journal :
- Nature
- Publication Type :
- Academic Journal
- Accession number :
- 17934446
- Full Text :
- https://doi.org/10.1038/nature06287