タイトル(掲載誌)Osteoarthritis and Cartilage
一般注記Objective When chondrocytes prepared from cartilage are expanded in monolayer culture, fibroblast-like cells gradually prevail. Although these prevailing fibroblast-like cells are believed to emerge because of the dedifferentiation of chondrocytes, the definite origin of the prevailing fibroblast-like cells has not been determined. We herein examined whether the prevailing non-chondrocytic cells observed after monolayer expansion culture arise from dedifferentiating chondrocytes or are the result of the overgrowth of fibroblasts that are present at the start of the culture. We also evaluated whether chondrocytes dedifferentiate because they proliferate or because they are cultured in monolayers. Methods Chondrocytes were prepared from Col11a2-EGFP transgenic mice and Col11a2-Cre; R26-stopflox-EYFP transgenic mice, which respectively express enhanced green fluorescent protein (EGFP) and Cre specifically in chondrocytes under the control of Col11a2 promoter/enhancer sequences. Col11a2-Cre; R26-stopflox-EYFP mice express enhanced yellow fluorescent protein (EYFP) only in cells which express or used to express Cre. We performed a time-lapse observation of the chondrocytes during monolayer expansion culture, and also observed the chondrocytes after treatment with mitomycin C. Results A time-lapse observation showed that Col11a2-EGFP chondrocytes underwent cell divisions, lost GFP fluorescence, increased cell numbers, and prevailed during the expansion culture. The observation of the Col11a2-Cre; R26-stopflox-EYFP chondrocytes confirmed that most of the cells after expansion in monolayer culture had been chondrocytes. Mitotically inactive chondrocytes generated by treatment with mitomycin C still underwent dedifferentiation, thus suggesting that chondrocyte dedifferentiation is not associated with cell division. Conclusion The non-chondrocytic cells that prevail after the monolayer expansion culture of chondrocytes originate from chondrocytes, and are not generated by the overgrowth of fibroblasts that are present at the start of the culture. Chondrocyte dedifferentiation does not appear to be associated with cell division.
〓 2013 Osteoarthritis Research Society International. Published
一次資料へのリンクURLhttps://u-fukui.repo.nii.ac.jp/?action=repository_action_common_download&item_id=20340&item_no=1&attribute_id=22&file_no=1
著作権情報Copyright 〓 2015 Elsevier B.V.
関連情報(DOI)10.1016/j.joca.2013.09.004
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース(IRDB)(機関リポジトリ)