Monitoring of blood vessels and tissues by a population of monocytes with patrolling behavior.

Cedric Auffray (1) , Darin Fogg (1) , Meriem Garfa (1) , Gaelle Elain (1) , Olivier Join-Lambert (2, 3) , Samer Kayal (1, 2, 3) , Sabine Sarnacki (2, 3) , Ana Cumano (4) , Gregoire Lauvau (5) , Frederic Geissmann (1, 2, 3)

1 Système des phagocytes mononucléés et immunopathologie
2 UPD5 - Université Paris Descartes - Paris 5
3 CHU Necker - Enfants Malades [AP-HP]
4 Développement des Lymphocytes
5 Immunologie des Maladies Infectieuses Allergiques et Autoimmunes

The cellular immune response to tissue damage and infection requires the recruitment of blood leukocytes. This process is mediated through a classical multistep mechanism, which involves transient rolling on the endothelium and recognition of inflammation followed by extravasation. We have shown, by direct examination of blood monocyte functions in vivo, that a subset of monocytes patrols healthy tissues through long-range crawling on the resting endothelium. This patrolling behavior depended on the integrin LFA-1 and the chemokine receptor CX(3)CR1 and was required for rapid tissue invasion at the site of an infection by this "resident" monocyte population, which initiated an early immune response and differentiated into macrophages.

Domains: Life Sciences [q-bio]; Immunology

Cedric Auffray, Darin Fogg, Meriem Garfa, Gaelle Elain, Olivier Join-Lambert, et al.. Monitoring of blood vessels and tissues by a population of monocytes with patrolling behavior.. Science, 2007, 317 (5838), pp.666-70. ⟨10.1126/science.1142883⟩. ⟨pasteur-00337698⟩