title: Myeloid and lymphoid contribution to non-haematopoietic lineages through irradiation-induced heterotypic cell fusion.
abstract: Recent studies have suggested that regeneration of non-haematopoietic cell lineages can occur through heterotypic cell fusion with haematopoietic cells of the myeloid lineage. Here we show that lymphocytes also form heterotypic-fusion hybrids with cardiomyocytes, skeletal muscle, hepatocytes and Purkinje neurons. However, through lineage fate-mapping we demonstrate that such in vivo fusion of lymphoid and myeloid blood cells does not occur to an appreciable extent in steady-state adult tissues or during normal development. Rather, fusion of blood cells with different non-haematopoietic cell types is induced by organ-specific injuries or whole-body irradiation, which has been used in previous studies to condition recipients of bone marrow transplants. Our findings demonstrate that blood cells of the lymphoid and myeloid lineages contribute to various non-haematopoietic tissues by forming rare fusion hybrids, but almost exclusively in response to injuries or inflammation.
authors.affiliation: Hematopoietic Stem Cell Laboratory, Lund University, BMC B10, Klinikgatan 26, 221 84 Lund, Sweden.
authors.forename: Jens M
authors.initials: JM
authors.lastname: Nygren
authors.forename: Karina
authors.initials: K
authors.lastname: Liuba
authors.forename: Martin
authors.initials: M
authors.lastname: Breitbach
authors.forename: Simon
authors.initials: S
authors.lastname: Stott
authors.forename: Lina
authors.initials: L
authors.lastname: Thorén
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Roell
authors.forename: Caroline
authors.initials: C
authors.lastname: Geisen
authors.forename: Philipp
authors.initials: P
authors.lastname: Sasse
authors.forename: Deniz
authors.initials: D
authors.lastname: Kirik
authors.forename: Anders
authors.initials: A
authors.lastname: Björklund
authors.forename: Claus
authors.initials: C
authors.lastname: Nerlov
authors.forename: Bernd K
authors.initials: BK
authors.lastname: Fleischmann
authors.forename: Stefan
authors.initials: S
authors.lastname: Jovinge
authors.forename: Sten Eirik W
authors.initials: SE
authors.lastname: Jacobsen
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology / Q000502:physiology; D016026:Bone Marrow Transplantation; D002459:Cell Fusion; D019070:Cell Lineage; D005260:Female; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000502:physiology*; D022781:Hepatocytes / Q000166:cytology / Q000502:physiology; D008214:Lymphocytes / Q000166:cytology / Q000502:physiology*; D051379:Mice; D016513:Mice, SCID; D008822:Mice, Transgenic; D018482:Muscle, Skeletal / Q000166:cytology; D022423:Myeloid Cells / Q000166:cytology / Q000502:physiology*; D032383:Myocytes, Cardiac / Q000166:cytology / Q000502:physiology; D011689:Purkinje Cells / Q000166:cytology / Q000502:physiology; D011827:Radiation; D018183:Transplantation Chimera
chemical_list: D049452:Green Fluorescent Proteins