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Time-lapse observation of the dedifferentiation process in mouse chondrocytes using chondrocyte-specific reporters.

Abstract：

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-stop(flox)-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-stop(flox)-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-stop(flox)-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.

journal_name

Osteoarthritis Cartilage

journal_title

Osteoarthritis and cartilage

authors

Minegishi Y,Hosokawa K,Tsumaki N

doi

10.1016/j.joca.2013.09.004

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

1968-75

issue

12

eissn

1063-4584

issn

1522-9653

pii

S1063-4584(13)00962-X

journal_volume

21

pub_type

杂志文章

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