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A functionally distinct subset of CD103(+) dendritic cells (DCs) has recently been identified in murine mesenteric lymph nodes (MLN) that induces enhanced FoxP3(+) T cell differentiation, retinoic acid receptor signaling, and gut-homing receptor (CCR9 and alpha4beta7) expression in responding T cells. We show that this function is specific to small intestinal lamina propria (SI-LP) and MLN CD103(+) DCs. CD103(+) SI-LP DCs appeared to derive from circulating DC precursors that continually seed the SI-LP. BrdU pulse-chase experiments suggested that most CD103(+) DCs do not derive from a CD103(-) SI-LP DC intermediate. The majority of CD103(+) MLN DCs appear to represent a tissue-derived migratory population that plays a central role in presenting orally derived soluble antigen to CD8(+) and CD4(+) T cells. In contrast, most CD103(-) MLN DCs appear to derive from blood precursors, and these cells could proliferate within the MLN and present systemic soluble antigen. Critically, CD103(+) DCs with similar phenotype and functional properties were present in human MLN, and their selective ability to induce CCR9 was maintained by CD103(+) MLN DCs isolated from SB Crohn's patients. Thus, small intestinal CD103(+) DCs represent a potential novel target for regulating human intestinal inflammatory responses.

Original publication

DOI

10.1084/jem.20080414

Type

Journal article

Journal

J exp med

Publication Date

01/09/2008

Volume

205

Pages

2139 - 2149

Keywords

Animals, Antigens, CD, Cells, Cultured, Conserved Sequence, Dendritic Cells, Flow Cytometry, Humans, Integrin alpha Chains, Integrins, Intestinal Mucosa, Intestine, Small, Lymph Nodes, Mice, Mice, Inbred BALB C, Receptors, CCR, T-Lymphocytes