Defective Mer Receptor Tyrosine Kinase Signaling in Bone Marrow Cells Promotes Apoptotic Cell Accumulation and Accelerates Atherosclerosis

Author:

Ait-Oufella Hafid1,Pouresmail Vahid1,Simon Tabassome1,Blanc-Brude Olivier1,Kinugawa Kiyoka1,Merval Régine1,Offenstadt Georges1,Lesèche Guy1,Cohen Philip L.1,Tedgui Alain1,Mallat Ziad1

Affiliation:

1. From the Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 689 (H.A.-O., V.P., T.S., O.B.-B., K.K., R.M., A.T., Z.M.), Centre de Recherche Cardiovasculaire Lariboisière, Paris, France; Service de Réanimation Médicale (H.A.-O., G.O.), Hôpital Saint-Antoine, Paris, France; Service de Chirurgie Thoracique et Vasculaire (G.L.), Hôpital Bichat, Paris, France; and Philadelphia VA Medical Center (P.L.C.), University of Pennsylvania, Philadelphia.

Abstract

Objective— To study the role of Mer receptor tyrosine kinase (mertk) in atherosclerosis. Methods and Results— We irradiated and reconstituted atherosclerosis-susceptible C57Bl/6 low-density lipoprotein receptor-deficient female mice ( ldlr −/− ) with either a mertk +/+ or mertk −/− (tyrosine kinase-defective mertk) bone marrow. The mice were put on high-fat diet for either 8 or 15 weeks. Mertk deficiency led to increased accumulation of apoptotic cells within the lesions, promoted a proinflammatory immune response, and accelerated lesion development. Conclusions— Mertk expression by bone marrow-derived cells is required for the disposal of apoptotic cells and controls lesion development and inflammation.

Publisher

Ovid Technologies (Wolters Kluwer Health)

Subject

Cardiology and Cardiovascular Medicine

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