Cutting edge: parathyroid hormone facilitates macrophage efferocytosis in bone marrow via proresolving mediators resolvin D1 and resolvin D2

LK McCauley, J Dalli, AJ Koh, N Chiang… - The Journal of …, 2014 - journals.aai.org
The Journal of Immunology, 2014journals.aai.org
Bone marrow macrophages stimulate skeletal wound repair and osteoblastic bone formation
by poorly defined mechanisms. Specialized proresolving mediators of inflammation drive
macrophage efferocytosis (phagocytosis of apoptotic cells) and resolution, but little is known
regarding this process in the bone marrow. In this study, metabololipidomic profiling via
liquid chromatography mass spectrometry revealed higher levels of specialized proresolving
mediators in the bone marrow relative to the spleen. The endocrine and bone anabolic …
Abstract
Bone marrow macrophages stimulate skeletal wound repair and osteoblastic bone formation by poorly defined mechanisms. Specialized proresolving mediators of inflammation drive macrophage efferocytosis (phagocytosis of apoptotic cells) and resolution, but little is known regarding this process in the bone marrow. In this study, metabololipidomic profiling via liquid chromatography mass spectrometry revealed higher levels of specialized proresolving mediators in the bone marrow relative to the spleen. The endocrine and bone anabolic agent parathyroid hormone increased specialized proresolving mediator levels, including resolvins (Rvs), in bone marrow. Human and murine primary macrophages efferocytosed apoptotic osteoblasts in vitro, and RvD1 and RvD2 (10 pM–10 nM) enhanced this process. These findings support a unique profile of specialized lipid mediators in bone marrow that contribute to a feedback system for resolution of inflammation and maintenance of skeletal homeostasis.
journals.aai.org