MGL2+ dermal dendritic cells are sufficient to initiate contact hypersensitivity in vivo

Yosuke Kumamoto, Kaori Denda-Nagai, Satoshi Aida, Nobuaki Higashi, Tatsuro Irimura

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Background: Dendritic cells (DCs) are the most potent antigen-presenting cells in the mammalian immune system. In the skin, epidermal Langerhans cells (LCs) and dermal dendritic cells (DDCs) survey for invasive pathogens and present antigens to T cells after migration to the cutaneous lymph nodes (LNs). So far, functional and phenotypic differences between these two DC subsets remain unclear due to lack of markers to identify DDCs. Methodology/Principal Findings: In the present report, we demonstrated that macrophage galactose-type C-type lectin (MGL) 2 was exclusively expressed in the DDC subset in the skin-to-LN immune system. In the skin, MGL2 was expressed on the majority (about 88%) of MHCII+CD11c+ cells in the dermis. In the cutaneous LN, MGL2 expression was restricted to B220-CD8α loCD11b+CD11c+MHCIIhi tissue-derived DC. MGL2+DDC migrated from the dermis into the draining LNs within 24 h after skin sensitization with FITC. Distinct from LCs, MGL2+DDCs localized near the high endothelial venules in the outer T cell cortex. In FITC-induced contact hypersensitivity (CHS), adoptive transfer of FITC+MGL2+DDCs, but not FITC+MGL2-DCs into naive mice resulted in the induction of FITC-specific ear swelling, indicating that DDCs played a key role in initiation of immune responses in the skin. Conclusions/Significance: These results demonstrated the availability of MGL2 as a novel marker for DDCs and suggested the contribution of MGL2+ DDCs for initiating CHS.

Original languageEnglish (US)
Article numbere5619
JournalPloS one
Volume4
Issue number5
DOIs
StatePublished - May 19 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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