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Cutting Edge |
Departments of
* Pathology and Immunology and
Otolaryngology, Washington University School of Medicine, St. Louis, MO 63110; and
Istituto di Anatomia Patologica, Universitá di Brescia, Spedali Civili di Brescia, Brescia, Italy
Human natural IFN-producing cells (IPC) circulate in the blood and cluster in chronically inflamed lymph nodes around high endothelial venules (HEV). Although L-selectin, CXCR4, and CCR7 are recognized as critical IPC homing mediators, the role of CXCR3 is unclear, since IPC do not respond to CXCR3 ligands in vitro. In this study, we show that migration of murine and human IPC to CXCR3 ligands in vitro requires engagement of CXCR4 by CXCL12. We also demonstrate that CXCL12 is present in human HEV in vivo. Moreover, after interaction with pathogenic stimuli, murine and human IPC secrete high levels of inflammatory chemokines. Thus, IPC migration into inflamed lymph nodes may be initially mediated by L-selectin, CXCL12, and CXCR3 ligands. Upon pathogen encounter, IPC positioning within the lymph node may be further directed by CCR7 and IPC secretion of inflammatory chemokines may attract other IPC, promoting cluster formation in lymph nodes.
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