PMID: 9556132Apr 29, 1998Paper

Kinetic studies on epiphyseal growth cartilage in the normal mouse

Bone
P VankyB Wikström

Abstract

The synthesis of DNA was studied in the proximal tibial growth plate of 25-day-old healthy NMRI mice by using the thymidine analog bromodeoxyuridine (BrdUrd), which is incorporated into cells in the S-phase. Such cells were found only in the upper three fifths of the morphologically defined proliferating zone. This zone was therefore subdivided into a functional proliferating zone (the S-phase zone) where most, if not all, chondrocytes proliferate, and a remaining maturation zone. The BrdUrd containing immunoreactive cells could then be followed at different intervals and they were found at the chondro-osseous junction after only 36 h. By using double-labeling with BrdUrd and iododeoxyuridine (IdUrd) the duration of cell cycle components could be estimated; that is, the time for DNA synthesis (S-phase), second gap and mitosis (G2 + M-phase), and remaining first gap (G1). We determined an S-phase time of 7.1 h and an average cell-cycle duration of 36 h. The G2 + M-phase was estimated as 3.5-4 h, leaving an average G1-phase time of 25 h, which probably varies considerably between chondrocytes. By combining these data with morphometrical data regarding distances between cells, we calculated a total growth rate of 9.0 microm/h. Of ...Continue Reading

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