Myeloid and lymphoid contribution to non-haematopoietic lineages through irradiation-induced heterotypic cell fusion.
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.
Nygren
Jens M
JM
Hematopoietic Stem Cell Laboratory, Lund University, BMC B10, Klinikgatan 26, 221 84 Lund, Sweden.
Liuba
Karina
K
Breitbach
Martin
M
Stott
Simon
S
Thorén
Lina
L
Roell
Wilhelm
W
Geisen
Caroline
C
Sasse
Philipp
P
Kirik
Deniz
D
Björklund
Anders
A
Nerlov
Claus
C
Fleischmann
Bernd K
BK
Jovinge
Stefan
S
Jacobsen
Sten Eirik W
SE
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
D049452:Green Fluorescent Proteins