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Departments of
*
Epidemiology and Public Health and
Internal Medicine, Yale University School of Medicine, New Haven, CT 06520;
Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322;
Inflammation Biology Section, Laboratory of Clinical Investigation, National Institutes of Allergy and Infectious Diseases, Bethesda, MD 20892; and
¶ Departamento de Immunología y Oncología, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain
The follicle-associated epithelium (FAE) secretes chemokines important in the recruitment of various cell types including CCL20 (MIP-3
). CCL20 is chemotactic to the CD11b+ dendritic cells (DCs) distributed in the subepithelial dome regions of the Peyer’s patches, and mice deficient in the receptor for CCL20, CCR6, have been reported to be devoid of the CD11b+ DCs in the dome regions. Here, we describe another chemokine specifically secreted from the FAE of mouse Peyer’s patches, CCL9 (MIP-1
, CCF18, MRP-2). By in situ hybridization, we demonstrated that CCL9 mRNA was expressed by the FAE but not by the villus epithelium. At the protein level, CCL9 was detected on the FAE and on extracellular matrix structures within the dome regions of the Peyer’s patches. By RT-PCR, we demonstrated that one of the putative receptors for CCL9, CCR1, was expressed by the Peyer’s patch CD11b+ DCs and in a chemotaxis assay, CD11b+ DCs migrated toward CCL9. To compare the abilities of the chemokines CCL20 and CCL9 to recruit CD11b+ DCs to the dome regions, we examined the in vivo distribution of these cells in CCR6-deficient, CCL9-blocked wild type, or CCL9-blocked CCR6-deficient mice. To our surprise, using a sensitive immunofluorescence analysis, we observed that CD11b+ DCs were present in the dome regions of the CCR6-deficient mice. In contrast, Ab neutralization of CCL9 in vivo resulted in significant reduction of the CD11b+ DC number in the subepithelial dome regions of Peyer’s patches of both wild type and CCR6 -/- mice. Taken together, these results demonstrate an important role of CCL9 in CD11b+ DC recruitment to the dome regions of mouse Peyer’s patches.
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