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Changes in cell surface antigens during in vitro lizard myogenesis.

M F Marusich, S B Simpson

    Developmental Biology
    |June 1, 1983
    PubMed
    Summary
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    Researchers identified a muscle-specific surface antigen (Ag1422) appearing during lizard cell differentiation. They also observed restricted surface component mobility in differentiated cells, independent of microfilaments or microtubules.

    Area of Science:

    • Cell Biology
    • Developmental Biology
    • Muscle Differentiation

    Background:

    • Myogenesis involves complex cellular and molecular changes.
    • Cell surface molecules play crucial roles in cell differentiation and communication.
    • Understanding stage-specific surface antigen expression is key to deciphering myogenic processes.

    Purpose of the Study:

    • To identify and characterize cell surface antigen changes during lizard myogenic cell differentiation in vitro.
    • To investigate alterations in cell surface component mobility during myogenesis.
    • To correlate surface antigen expression and mobility with specific differentiation stages.

    Main Methods:

    • Indirect immunofluorescence was used to detect cell surface antigens.
    • Enzymatic treatments (neuraminidase, trypsin, proteinase K) were employed to probe antigen nature.

    Related Experiment Videos

  • Adsorption assays confirmed antigen specificity.
  • Analysis of cell surface component mobility was performed using multivalent ligands.
  • Effects of cytochalasin B and colchicine on mobility were assessed.

    • Main Results:

    • A muscle-specific antigen, Ag1422, appears during differentiation, present on myocytes and myotubes but not proliferating myoblasts.
    • Ag1422 is protein in nature and its expression is developmentally regulated, observed in both regenerating and embryonic muscle.
    • Differentiated myogenic cells exhibit restricted mobility of surface components, unlike undifferentiated myoblasts.
    • This mobility restriction is not affected by cytochalasin B or colchicine, suggesting microfilaments and microtubules are not involved.

    Conclusions:

    • Ag1422 is a reliable marker for differentiating lizard myogenic cells.
    • Cell surface antigen expression and mobility undergo significant, stage-specific changes during myogenesis.
    • The observed mobility restriction is independent of cytoskeletal elements, indicating novel regulatory mechanisms.