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a Pathology Division, and
b Investigative Treatment Division, National Cancer Center Research Institute East, Kashiwa, Chiba, Japan;
c Laboratory of Cancer Biology, Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba, Japan;
d Department of Biotechnology, Institute of Research and Innovation, Kashiwa, Chiba, Japan
Key Words. Bone marrow–derived fibroblasts • Green fluorescent protein
Correspondence: Atsushi Ochiai, M.D., Ph.D., Pathology Division, National Cancer Center Research Institute East, 6-5-1 Kashiwanoha, Kashiwa-City, Chiba 277-8577, Japan. Telephone: 81-4-7134-6855; Fax: 81-4-7134-6865; e-mail: aochiai{at}east.ncc.go.jp
Fibroblasts, which are widely distributed and play a key part in tissue fibrosis, are phenotypically and functionally heterogeneous. Recent studies reported that bone marrow can be a source of tissue fibroblast. In the study reported here, we investigated in vivo characterization of bone marrow–derived fibroblasts recruited into various fibrotic lesions. Mice were engrafted with bone marrow isolated from transgenic mice expressing green fluorescent protein (GFP), and fibrotic lesions were induced by cancer implantation (skin), excisional wounding (skin), and bleomycin administration (lung). A small population of GFP+ fibroblast was found even in nonfibrotic skin (8.7% ± 4.6%) and lung (8.9% ± 2.5%). The proportion of GFP+ fibroblasts was significantly increased after cancer implantation(59.7%±16.3%) and excisional wounding (32.2% ± 4.8%), whereas it was not elevated after bleomycin administration (7.1% ± 2.4%). Almost all GFP+ fibroblasts in fibrotic lesions expressed type I collagen, suggesting that bone marrow–derived fibroblasts would contribute to tissue fibrosis. GFP+ fibroblasts expressed CD45, Thy-1, and
-smooth muscle actin at various proportions. Our results suggested that bone marrow–derived fibroblasts expressed several fibroblastic markers in vivo and could be efficiently recruited into fibrotic lesions in response to injurious stimuli; however, the degree of recruitment frequency might depend on the tissue microenvironment.
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