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Blood, 15 January 2006, Vol. 107, No. 2, pp. 806-812.
Prepublished online as a Blood First Edition Paper on October 4, 2005; DOI 10.1182/blood-2005-01-0154.
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PHAGOCYTES
How to drain without lymphatics? Dendritic cells migrate from the cerebrospinal fluid to the B-cell follicles of cervical lymph nodes
Eric Hatterer,
Nathalie Davoust,
Marianne Didier-Bazes,
Carine Vuaillat,
Christophe Malcus,
Marie-Françoise Belin, and
Serge Nataf
From the Institut National de la Santé et de la Recherche Médicale (INSERM) U433, Institut Fédératif de Recherche (IFR) 19, Faculté deMédecine Laennec, Université Claude Bernard, Lyon, France.
The lack of draining lymphatic vessels in the central nervous system (CNS) contributes to the so-called "CNS immune privilege." However, despite such a unique anatomic feature, dendritic cells (DCs) are able to migrate from the CNS to cervical lymph nodes through a yet unknown pathway. In this report, labeled bone marrow-derived myeloid DCs were injected stereotaxically into the cerebrospinal fluid (CSF) or brain parenchyma of normal rats. We found that DCs injected within brain parenchyma migrate little from their site of injection and do not reach cervical lymph nodes. In contrast, intra-CSF-injected DCs either reach cervical lymph nodes or, for a minority of them, infiltrate the subventricular zone, where neural stem cells reside. Surprisingly, DCs that reach cervical lymph nodes preferentially target B-cell follicles rather than T-cell-rich areas. This report sheds a new light on the specific role exerted by CSF-infiltrating DCs in the control of CNS-targeted immune responses. (Blood. 2006; 107:806-812)
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