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Collagen gene expression during limb cartilage differentiation.

R A Kosher, W M Kulyk, S W Gay

    The Journal of Cell Biology
    |April 1, 1986
    PubMed
    Summary
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    During limb development, type II collagen messenger RNA (mRNA) levels rise significantly as mesenchymal cells differentiate into chondrocytes. Type I collagen gene expression is regulated post-transcriptionally, with mRNA present even when protein synthesis stops.

    Area of Science:

    • Molecular Biology
    • Developmental Biology
    • Biochemistry

    Background:

    • Limb mesenchymal cells differentiate into chondrocytes during development.
    • Chondrogenesis involves changes in collagen synthesis, with type II collagen increasing and type I collagen decreasing.
    • Understanding the regulation of collagen gene expression is crucial for studying cartilage formation.

    Purpose of the Study:

    • To examine changes in cytoplasmic type I and type II collagen messenger RNA (mRNA) levels during limb chondrogenesis.
    • To investigate the transcriptional and translational regulation of type I and type II collagen genes during chondrogenesis.
    • To correlate collagen mRNA levels with the stages of chondrogenic differentiation in vitro and in vivo.

    Main Methods:

    • Utilized cloned complementary DNA (cDNA) probes to quantify cytoplasmic type I and type II collagen mRNA levels.

    Related Experiment Videos

  • Analyzed mRNA changes during both in vitro and in vivo limb chondrogenesis.
  • Assessed gene expression at the transcriptional and translational levels.

    • Main Results:

    • A significant increase in type II collagen mRNA was observed during the condensation stage of chondrogenesis.
    • Type II collagen mRNA levels progressively increased with cartilage matrix accumulation.
    • Type I collagen gene expression appears to be regulated at the translational level, with mRNA present in differentiated chondrocytes.
    • Low levels of type II collagen mRNA were detected in prechondrogenic cells before overt differentiation.

    Conclusions:

    • The differentiation of limb mesenchymal cells into chondrocytes is characterized by a marked increase in type II collagen mRNA.
    • Regulation of type I collagen synthesis during chondrogenesis occurs, at least partly, at the translational level.
    • The study provides insights into the molecular mechanisms governing collagen gene expression during cartilage development.