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Determination of proliferative characteristics of growth plate chondrocytes by labeling with bromodeoxyuridine

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Summary

Postnatal bone growth occurs by the process of endochondral ossification in cartilaginous growth plates at the ends of long bones. The rate and extent of long bone growth is determined by a combination of chondrocytic proliferation, matrix production, and increase in chondrocytic height in the direction of growth during cellular enlargement. In this study, single pulse and/or repeated pulse labeling with the thymidine analog bromodeoxyuridine (BrdU) was used to study the role of cellular proliferation in controlling long bone growth. Variables studied included progression of the label over time following a pulse, and patterns and progression of the label over time following repeated pulse labeling for 24 and 48 hours. Examination was made of the proliferative characteristics of chondrocytes, the spatial pattern of cellular proliferation, and cell cycle kinetics. With respect to the spatial pattern of proliferative chondrocytes, results suggest that chondrocytes within a column are more synchronized with each other than are chondrocytes in different columns. This is consistent with the concept that each column represents a clonal expansion of a stem cell, which may proceed independently from adjacent columns. Despite this apparent heterogeneity, all chondrocytes in the proliferative zone complete at least one cell cycle in 24–28 hours. This estimate of the cell cycle time is significantly shorter than previous estimates of cell cycle times in similar growth plates. Our results also suggest that chondrocytes entering the cell cycle in the proximal part of the growth plate spend an average of 4 days in the proliferative cell zone, representing approximately four cellular divisions. After leaving the cell cycle, an additional 48 hours is required for the label to reach the terminal chondrocyte, which represents the time required to complete hypertrophy. These data are important when considering hypotheses concerning both the role of controls on proliferation in the determination of overall rate of long bone growth, as well as the interplay between proliferation and hypertrophy in regulating the overall amount of growth achieved by a given growth plate.

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Authors and Affiliations

  1. Department of Anatomy, College of Veterinary Medicine, Cornell University, 14853, Ithaca, New York, USA

    Cornelia E. Farnum

  2. Department of Comparative Biosciences, School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin, USA

    Norman J. Wilsman

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  1. Cornelia E. Farnum
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  2. Norman J. Wilsman
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Farnum, C.E., Wilsman, N.J. Determination of proliferative characteristics of growth plate chondrocytes by labeling with bromodeoxyuridine. Calcif Tissue Int 52, 110–119 (1993). https://doi.org/10.1007/BF00308319

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  • DOI: https://doi.org/10.1007/BF00308319

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