title: The transdifferentiation of bone-marrow-derived cells in colonic mucosal regeneration after dextran-sulfate-sodium-induced colitis in mice.
abstract: Bone-marrow-derived cells (BMDCs) transdifferentiate into various types of gastrointestinal cells. The precise transdifferentiation of BMDCs in gut regeneration, however, is controversial. In this study, we examined the transdifferentiation of BMDCs in the regeneration of damaged colonic epithelia. Lethally irradiated wild-type female mice (C57BL/6) were rescued by bone marrow transplantation from male green fluorescent protein transgenic mouse donors. Chronic colitis was induced by administering 3% dextran sulfate sodium (DSS) in the drinking water for 5 days on day 28 after the bone marrow transplantation. The mice were killed on day 25 after DSS administration. BMDC phenotypes were examined by confocal microscopy and fluorescence immunohistochemistry. BMDCs were frequently observed in the vimentin-positive colonic interstitial cells, which also expressed alpha-smooth muscle actin and had a spindle-like morphology, but did not express leukocyte common antigen. Green-fluorescent-protein-positive cells were rarely or less frequently found in Ki-67-positive proliferating cells, cytokeratin-positive epithelial cells, or CD31-positive endothelial cells. BMDCs frequently transdifferentiated into subepithelial myofibroblasts and fibroblasts, and often continued to reside in the colonic subepithelia after the experimental colitis had healed. In conclusion, our data indicate the fate of BMDCs, which might be involved in the healing process of the colon after DSS-induced colitis. Our data show that BMDCs contribute to colonic interstitial cells after the colitis has healed. Understanding the fate of BMDCs may be important for stem cell therapy by BMDCs.
authors.affiliation: Department of Clinical Laboratory Science, Osaka University Graduate School of Medicine, Suita, Japan. yhayashi@sahs.med.osaka-u.ac.jp
authors.forename: Yujiro
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Shingo
authors.initials: S
authors.lastname: Tsuji
authors.forename: Masahiko
authors.initials: M
authors.lastname: Tsujii
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nishida
authors.forename: Shuji
authors.initials: S
authors.lastname: Ishii
authors.forename: Tohru
authors.initials: T
authors.lastname: Nakamura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Eguchi
authors.forename: Sunao
authors.initials: S
authors.lastname: Kawano
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology*; D016026:Bone Marrow Transplantation; D002454:Cell Differentiation; D003092:Colitis / Q000503:physiopathology / Q000628:therapy*; D003106:Colon / Q000166:cytology*; D016264:Dextran Sulfate; D005260:Female; D005347:Fibroblasts / Q000166:cytology; D007413:Intestinal Mucosa / Q000166:cytology*; D017493:Leukocyte Common Antigens / Q000032:analysis; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D012038:Regeneration
chemical_list: D016264:Dextran Sulfate; D017493:Leukocyte Common Antigens