title: Roles of osteoclasts in the control of medullary hematopoietic niches.
abstract: Bone marrow is the major site of hematopoiesis in mammals. The bone marrow environment plays an essential role in the regulation of hematopoietic stem and progenitor cells by providing specialized niches in which these cells are maintained. Many cell types participate to the composition and regulation of hematopoietic stem cell (HSC) niches, integrating complex signals from the bone, immune and nervous systems. Among these cells, the bone-resorbing osteoclasts (OCLs) have been described as main regulators of HSC niches. They are not limited to carving space for HSCs, but they also provide signals that affect the molecular and cellular niche components. However, their exact role in HSC niches remains unclear because of the variety of models, signals and conditions used to address the question. The present review will discuss the importance of the implication of OCLs focusing on the formation of HSC niches, the maintenance of HSCs in these niches and the mobilization of HSCs from the bone marrow. It will underline the importance of OCLs in HSC niches.
authors.affiliation: CNRS UMR7370, LP2M, Faculty of Medicine, 28 Av de Valombrose, 06107 Nice, France; University Nice Sophia Antipolis, Faculty of Sciences, Parc Valrose, 06100 Nice, France. Electronic address: blin@unice.fr.
authors.forename: Claudine
authors.initials: C
authors.lastname: Blin-Wakkach
authors.affiliation: CNRS UMR7370, LP2M, Faculty of Medicine, 28 Av de Valombrose, 06107 Nice, France; University Nice Sophia Antipolis, Faculty of Sciences, Parc Valrose, 06100 Nice, France.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Rouleau
authors.affiliation: CNRS UMR7370, LP2M, Faculty of Medicine, 28 Av de Valombrose, 06107 Nice, France; University Nice Sophia Antipolis, Faculty of Sciences, Parc Valrose, 06100 Nice, France.
authors.forename: Abdelilah
authors.initials: A
authors.lastname: Wakkach
mesh_terms: D000818:Animals; D001846:Bone Development / Q000502:physiology*; D002454:Cell Differentiation; D002465:Cell Movement / Q000502:physiology; D025461:Feedback, Physiological / Q000502:physiology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000502:physiology*; D006801:Humans; D010010:Osteoclasts / Q000166:cytology* / Q000502:physiology*; D055153:Stem Cell Niche / Q000502:physiology*
keywords: Bone marrow; Cell mobilization; Hematopoietic niches; Osteoclasts; Osteopetrosis