title: Regulation of hematopoiesis by T lymphocytes and natural killer cells.
abstract: T lymphocytes and natural killer (NK) cells exert both stimulatory and suppressive effects that regulate growth and differentiation of hematopoietic cells. Activated T and NK cells have been demonstrated in different pathological states of bone marrow failure and are proposed to play a role in the pathogenesis of the disease. T and NK cells have also been shown to be responsible for bone marrow graft rejection in both allogeneic and syngeneic donor/recipient combinations. Lymphocytes can regulate hematopoietic cell growth by direct cellular contact or by releasing soluble factors, such as colony-stimulating factors, immune interferon, lymphotoxin, and tumor necrosis factor, active on hematopoietic precursor cells.
mesh_terms: D000740:Anemia / Q000209:etiology; D000818:Animals; D002454:Cell Differentiation; D006410:Hematopoiesis; D006706:Homeostasis; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D008222:Lymphokines / Q000378:metabolism; D051379:Mice; D008815:Mice, Inbred Strains; D013601:T-Lymphocytes / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000378:metabolism
chemical_list: D008222:Lymphokines