title: The hematopoietic stem cell niche in homeostasis and disease.
abstract: The bone marrow microenvironment contains a heterogeneous population of stromal cells organized into niches that support hematopoietic stem cells (HSCs) and other lineage-committed hematopoietic progenitors. The stem cell niche generates signals that regulate HSC self-renewal, quiescence, and differentiation. Here, we review recent studies that highlight the heterogeneity of the stromal cells that comprise stem cell niches and the complexity of the signals that they generate. We highlight emerging data that stem cell niches in the bone marrow are not static but instead are responsive to environmental stimuli. Finally, we review recent data showing that hematopoietic niches are altered in certain hematopoietic malignancies, and we discuss how these alterations might contribute to disease pathogenesis.
authors.affiliation: Department of Medicine and Pharmacology & Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY; and.
authors.forename: Laura M
authors.initials: LM
authors.lastname: Calvi
authors.affiliation: Departments of Medicine and Pathology & Immunology, Washington University School of Medicine, St. Louis, MO.
authors.forename: Daniel C
authors.initials: DC
authors.lastname: Link
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D019337:Hematologic Neoplasms / Q000378:metabolism* / Q000473:pathology; D006412:Hematopoietic Stem Cells / Q000378:metabolism* / Q000473:pathology; D006706:Homeostasis; D006801:Humans; D055153:Stem Cell Niche