title: Molecular mechanisms underlying lineage bias in aging hematopoiesis.
abstract: Although hematopoietic stem cells (HSCs) have traditionally been thought to possess the ability to give rise to all the mature cell types in the hematopoietic system, this conception of hematopoiesis was based on evaluation of hematopoietic output from large numbers of HSCs using transplantation models.  More recent studies evaluating HSCs at the clonal or near-clonal level, both in transplantation studies and during in situ hematopoiesis, have established that individual HSCs can exhibit lineage bias, giving rise to myeloid-biased, lymphoid-biased, or more balanced differentiation, with the proportion of myeloid-biased HSCs increasing with age.  This age-associated shift in lineage potential is associated with decreased cellular immunity and increased incidence of diseases with prominent inflammatory components including atherosclerosis, autoimmunity, neurodegenerative disease, and carcinogenesis. Understanding the molecular mechanisms that regulate this shift in linage bias therefore represents an important area of investigation in numerous human diseases.  In this review, we summarize our current understanding of the cell-intrinsic (autonomous) and cell-extrinsic factors that regulate HSC lineage fate bias during aging.  In addition, we have attempted to bring attention to important caveats and unanswered questions related to the issue of HSC lineage bias to encourage explorations of these important lines of inquiry. Ultimately, we expect a comprehensive understanding of HSC lineage bias during aging to have important implications for human health, since strategies to alter lineage bias in old HSCs not only has the potential to restore immune function in the elderly, but also to reduce the incidence of inflammation-associated diseases, many for which there is a current unmet need for novel and more effective treatments.
authors.affiliation: Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
authors.forename: Harold K
authors.initials: HK
authors.lastname: Elias
authors.affiliation: Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden.
authors.forename: David
authors.initials: D
authors.lastname: Bryder
authors.affiliation: Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA; Department of Pathology, NYU School of Medicine, New York, NY, USA. Electronic address: christopher.park@nyumc.org.
authors.forename: Christopher Y
authors.initials: CY
authors.lastname: Park
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D019070:Cell Lineage / Q000235:genetics*; D016922:Cellular Senescence / Q000235:genetics*; D006410:Hematopoiesis / Q000235:genetics*; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D006801:Humans
keywords: Aging; Cell-intrinsic; Clonal hematopoiesis; Deterministic; Hematopoietic stem cell; Lineage bias