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Science 14 January 2005:
Vol. 307. no. 5707, pp. 254 - 258
DOI: 10.1126/science.1102901

Reports

CX3CR1-Mediated Dendritic Cell Access to the Intestinal Lumen and Bacterial Clearance

Jan Hendrik Niess,1 Stephan Brand,1 Xiubin Gu,1 Limor Landsman,4 Steffen Jung,4,5 Beth A. McCormick,2 Jatin M. Vyas,3 Marianne Boes,6 Hidde L. Ploegh,6 James G. Fox,7 Dan R. Littman,5 Hans-Christian Reinecker1*

Dendritic cells (DCs) and macrophages are critical to innate and adaptive immunity to the intestinal bacterial microbiota. Here, we identify a myeloid-derived mucosal DC in mice, which populates the entire lamina propria of the small intestine. Lamina propria DCs were found to depend on the chemokine receptor CX3CR1 to form transepithelial dendrites, which enable the cells to directly sample luminal antigens. CX3CR1 was also found to control the clearance of entero-invasive pathogens by DCs. Thus, CX3CR1-dependent processes, which control host interactions of specialized DCs with commensal and pathogenic bacteria, may regulate immunological tolerance and inflammation.

1 Gastrointestinal Unit, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
2 Department of Pediatric Gastroenterology, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
3 Division of Infectious Diseases and Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.
4 Department of Immunology, The Weizmann Institute of Science, Rehovot 76100, Israel.
5 Molecular Pathogenesis Program, Howard Hughes Medical Institute, Skirball Institute of Biomolecular Medicine, New York University School of Medicine, 540 First Avenue, New York, NY 10016, USA.
6 Department of Pathology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.
7 Division of Comparative Medicine, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 16-825A, Cambridge, MA 02139, USA.

* To whom correspondence should be addressed. E-mail: hans-christian_reinecker{at}hms.harvard.edu

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