The Journal of Experimental Medicine
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The Journal of Experimental Medicine, Vol 130, 417-442, Copyright © 1969 by The Rockefeller University Press

ARTICLE

THE LOSS OF PHENOTYPIC TRAITS BY DIFFERENTIATED CELLS : VI. BEHAVIOR OF THE PROGENY OF A SINGLE CHONDROCYTE



S. Chacko PhD.1, J. Abbott PhD.1, S. Holtzer PhD.1, and H. Holtzer PhD.1

1 From the Department of Pathology and Anatomy, School of Veterinary Medicine and School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, and Department of Biology, Columbia University, New York 10032

A single, functional, mitotically quiescent chondrocyte may be induced to reenter the mitotic cyde, and produce a progeny of over 1011 cells. Sessile, adherent, polygonal cells deposit matrix, whereas amoeboid, dispersed, flattened fibroblastic cells do not. The prior synthetic history of a cell is of greater importance in determining whether the characteristic chondrogenic phenotype will be expressed, rather than growth in "permissive" or "nonpermissive" medium. Clonal conditions select for stem-like cells, some of whose progeny may become polygonal chondrocytes. The retention of the characteristic chondrogenic phenotype in vitro is favored by pruning the dedifferentiated chondrocytes which arise in these cultures. Dedifferentiated chondrocytes interfere with the deposition and synthesis of chondroitin sulfate by neighboring functional chondrocytes. Possible mechanisms are proposed to explain this type of cell-cell or cell exudate interference.

If the progeny of a single, genetically programmed chondrocyte may or may not synthesize chondroitin sulfate, then extragenic sites in the cytoplasm or cell surface must influence the decision as to which cluster of "luxur" molecules the cell will synthesize.

 Submitted on February 26, 1969


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