Development, Vol 111, Issue 1 191-196, Copyright © 1991 by Company of Biologists

JOURNAL ARTICLES

Collagen types IX and X in the developing chick tibiotarsus: analyses of mRNAs and proteins

TF Linsenmayer, QA Chen, E Gibney, MK Gordon, JK Marchant, R Mayne and TM Schmid
Department of Anatomy and Cellular Biology, Tufts University Health Sciences Schools, Boston, MA 02111.

To examine the regulation of collagen types IX and X during the hypertrophic phase of endochondral cartilage development, we have employed in situ hybridization and immunofluorescence histochemistry on selected stages of embryonic chick tibiotarsi. The data show that mRNA for type X collagen appears at or about the time that we detect the first appearance of the protein. This result is incompatible with translational regulation, which would require accumulation of the mRNA to occur at an appreciably earlier time. Data on later-stage embryos demonstrate that once hypertrophic chondrocytes initiate synthesis of type X collagen, they sustain high levels of its mRNA during the remainder of the hypertrophic program. This suggests that these cells maintain their integrity until close to the time that they are removed at the advancing marrow cavity. Type X collagen protein in the hypertrophic matrix also extends to the marrow cavity. Type IX collagen is found throughout the hypertrophic matrix, as well as throughout the younger cartilaginous matrices. But the mRNA for this molecule is largely or completely absent from the oldest hypertrophic cells. These data are consistent with a model that we have previously proposed in which newly synthesized type X collagen within the hypertrophic zone can become associated with type II/IX collagen fibrils synthesized and deposited earlier in development (Schmid and Linsenmayer, 1990; Chen et al. 1990).
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