TY - JOUR
T1 - Two different roles of purified CD45+c-Kit+Sca-1 +Lin- cells after transplantation in muscles
AU - Yoshimoto, Momoko
AU - Chang, Hsi
AU - Shiota, Mitsutaka
AU - Kobayashi, Hirohiko
AU - Umeda, Katsutsugu
AU - Kawakami, Atsushi
AU - Heike, Toshio
AU - Nakahata, Tatsutoshi
PY - 2005/5
Y1 - 2005/5
N2 - Recent studies have indicated that bone marrow cells can regenerate damaged muscles and that they can adopt phenotypes of other cells by cell fusion. Our direct visualization system gave evidence of massive muscle regeneration by green fluorescent protein (GFP)-labeled CD45+c-Kit +Sca-1+Lin- cells (KSL cells), and we investigated the role of KSL cells in muscle regeneration after transplantation with or without lethal irradiation. In the early phase, GFP signals were clearly observed in all the muscles of only irradiated mice. Transverse cryostat sections showed GFP+myosin+ muscle fibers, along with numerous GFP+ hematopoietic cells in damaged muscle. These phenomena were temporary, and GFP signals had dramatically reduced 30 days after transplantation. After 6 months, GFP+ fibers could hardly be detected, but GFP+c-Met+ mononuclear cells were located beneath the basal lamina where satellite cells usually exist in both conditioned mice. Immunostaining of isolated single fibers revealed GFP +PAX7+, GFP+MyoD+, and GFP +Myf5+ satellite-like cells on the fibers. Single-fiber cultures from these mice showed proliferation of GFP+ fibers. These results indicate two different roles of KSL cells: one leading to regeneration of damaged muscles in the early phase and the other to conversion into satellite cells in the late phase.
AB - Recent studies have indicated that bone marrow cells can regenerate damaged muscles and that they can adopt phenotypes of other cells by cell fusion. Our direct visualization system gave evidence of massive muscle regeneration by green fluorescent protein (GFP)-labeled CD45+c-Kit +Sca-1+Lin- cells (KSL cells), and we investigated the role of KSL cells in muscle regeneration after transplantation with or without lethal irradiation. In the early phase, GFP signals were clearly observed in all the muscles of only irradiated mice. Transverse cryostat sections showed GFP+myosin+ muscle fibers, along with numerous GFP+ hematopoietic cells in damaged muscle. These phenomena were temporary, and GFP signals had dramatically reduced 30 days after transplantation. After 6 months, GFP+ fibers could hardly be detected, but GFP+c-Met+ mononuclear cells were located beneath the basal lamina where satellite cells usually exist in both conditioned mice. Immunostaining of isolated single fibers revealed GFP +PAX7+, GFP+MyoD+, and GFP +Myf5+ satellite-like cells on the fibers. Single-fiber cultures from these mice showed proliferation of GFP+ fibers. These results indicate two different roles of KSL cells: one leading to regeneration of damaged muscles in the early phase and the other to conversion into satellite cells in the late phase.
KW - Hematopoietic stem cells
KW - Muscle stem cells
KW - Transplantation
KW - c-KitSca-1 Lin
UR - http://www.scopus.com/inward/record.url?scp=18444414020&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18444414020&partnerID=8YFLogxK
U2 - 10.1634/stemcells.2004-0220
DO - 10.1634/stemcells.2004-0220
M3 - Article
C2 - 15849168
AN - SCOPUS:18444414020
SN - 1066-5099
VL - 23
SP - 610
EP - 618
JO - Stem Cells
JF - Stem Cells
IS - 5
ER -