title: Platelet activation attracts a subpopulation of effector monocytes to sites of Leishmania major infection.
abstract: Leishmania species trigger a brisk inflammatory response and efficiently induce cell-mediated immunity. We examined the mechanisms whereby leukocytes were recruited into lesions after Leishmania major infection of mice. We found that a subpopulation of effector monocytes expressing the granulocyte marker GR1 (Ly6C) is rapidly recruited into lesions, and these monocytes efficiently kill L. major parasites. The recruitment of this subpopulation of monocytes depends on the chemokine receptor CCR2 and the activation of platelets. Activated platelets secrete platelet-derived growth factor, which induces the rapid release of CCL2 from leukocytes and mesenchymal cells. This work points to a new role for platelets in host defense involving the selective recruitment of a subpopulation of effector monocytes from the blood to efficiently kill this intracellular parasite.
authors: Department of Cell Biology and Molecular Genetics and the Maryland Pathogen Research Institute, University of Maryland, College Park, MD 20782, USA.
authors: Ricardo
authors: R
authors: Goncalves
authors: Xia
authors: X
authors: Zhang
authors: Heather
authors: H
authors: Cohen
authors: Alain
authors: A
authors: Debrabant
authors: David M
authors: DM
authors: Mosser
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