title: Extramedullary hematopoiesis: Elucidating the function of the hematopoietic stem cell niche (Review).
abstract: Extramedullary hematopoiesis (EMH) occurs under various circumstances, including during embryonic/developmental periods, pathological status secondary to insufficient bone marrow function or ineffective hematopoiesis, in hematological disorders, for example malignancies, as well as stromal disorders of the bone. EMH is characterized by hematopoietic cell accumulations in multiple body locations. Common EMH locations observed in clinical and pathological practice include the spleen, liver, lymph nodes and para‑vertebral regions. Among the various organs associated with EMH, the spleen offers a unique site for evaluation of hematopoietic stem cell (HSC)/niche interactions, as this organ is one of the most common sites of EMH. However, the spleen does not have a major role in embryonic/developmental hematopoiesis. A recent study by our group revealed that circulating HSCs may be trapped by chemokine (C‑X‑C motif) ligand 12 (CXCL12)‑positive cells at the margin of sinuses near CXCL12‑positive endothelial cells, resulting in the initiation of the first step of EMH, which is a similar mechanism to bone marrow hematopoiesis. The present review briefly discusses the environment of EMH in extramedullary spaces in order to investigate the mechanisms underlying HSC maintenance, and aid the elucidation of the niche‑stem cell interactions that occur in the bone marrow.
authors.affiliation: Department of Comprehensive Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo‑ku, Tokyo 113‑8519, Japan.
authors.forename: Kouhei
authors.initials: K
authors.lastname: Yamamoto
authors.affiliation: Department of Pathology, Kanazawa Medical University Hospital, Kanazawa, Ishikawa 920‑0293, Japan.
authors.forename: Yukako
authors.initials: Y
authors.lastname: Miwa
authors.affiliation: Department of Comprehensive Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo‑ku, Tokyo 113‑8519, Japan.
authors.forename: Shiho
authors.initials: S
authors.lastname: Abe-Suzuki
authors.affiliation: Department of Comprehensive Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo‑ku, Tokyo 113‑8519, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Abe
authors.affiliation: Department of Comprehensive Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo‑ku, Tokyo 113‑8519, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Kirimura
authors.affiliation: Department of Comprehensive Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo‑ku, Tokyo 113‑8519, Japan.
authors.forename: Iichiroh
authors.initials: I
authors.lastname: Onishi
authors.affiliation: Department of Comprehensive Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo‑ku, Tokyo 113‑8519, Japan.
authors.forename: Masanobu
authors.initials: M
authors.lastname: Kitagawa
authors.affiliation: Department of Comprehensive Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo‑ku, Tokyo 113‑8519, Japan.
authors.forename: Morito
authors.initials: M
authors.lastname: Kurata
mesh_terms: D047108:Embryonic Development; D006402:Hematologic Diseases / Q000473:pathology; D006411:Hematopoiesis, Extramedullary; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D055153:Stem Cell Niche; D017154:Stromal Cells / Q000473:pathology