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Migratory monocytes and granulocytes are major lymphatic carriers of Salmonella from tissue to draining lymph node
Author(s) -
Bonneau Michel,
Epardaud Mathieu,
Payot Fabrice,
Niborski Violeta,
Thoulouze MariaIsabel,
Bernex Florence,
Charley Bernard,
Riffault Sabine,
Guilloteau Laurence A.,
SchwartzCornil Isabelle
Publication year - 2006
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1189/jlb.0605288
Subject(s) - lymph , biology , lymph node , lymph node stromal cell , lymphatic system , cd80 , immune system , immunology , pathology , antigen , cd40 , medicine , cytotoxic t cell , biochemistry , in vitro
Dendritic cells (DC) are recognized as sentinels, which capture antigens in tissue and migrate to the lymph node, where they initiate immune responses. However, when a vaccine strain of green fluorescent protein‐expressing Salmonella abortusovis (SAO) was inoculated into sheep oral mucosa, it induced accumulation of myeloid non‐DC in the subcapsular sinus and paracortex of the draining lymph node, and SAO was mainly found associated with these cells (granulocytes and macrophages) but rarely with DC. To analyze how bacteria reached lymph nodes, we used cervical pseudo‐afferent lymph duct catheterization. We showed that Salmonella administered in the oral mucosa were traveling free in lymph or associated with cells, largely with lymph monocytes and granulocytes but less with DC. SAO also induced a strong influx of these phagocytic cells in afferent lymph. Migrating DC presented a semi‐mature phenotype, and SAO administration did not alter their expression of major histocompatibility complex type 2 and coactivation molecules. Compared with blood counterparts, lymph monocytes expressed lower levels of CD40, and granulocytes expressed higher levels of CD80. The data suggest that immunity to bacteria may result from the complex interplay between a mixture of phagocytic cell types, which transport antigens and are massively recruited via lymph to decisional lymph nodes.