Subcapsular sinus macrophages in lymph nodes clear lymph-borne viruses and present them to antiviral B cells.

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Junt, T; Moseman, EA; Iannacone, M; Massberg, S; Lang, PA; Boes, M; Fink, K; Henrickson, SE; Shayakhmetov, DM; Di Paolo, NC; van Rooijen, N; Mempel, TR; Whelan, SP; von Andrian, UH

Published Date

  • November 2007

Published In

Volume / Issue

  • 450 / 7166

Start / End Page

  • 110 - 114

PubMed ID

  • 17934446

Pubmed Central ID

  • 17934446

Electronic International Standard Serial Number (EISSN)

  • 1476-4687

International Standard Serial Number (ISSN)

  • 0028-0836

Digital Object Identifier (DOI)

  • 10.1038/nature06287

Language

  • eng