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Changing a limb muscle growth program into a resorption program.

Liquan Cai1, Biswajit Das, Donald D Brown

  • 1Carnegie Institution, 3520 San Martin Dr. Baltimore, MD 21218, USA.

Developmental Biology
|January 20, 2007
PubMed
Summary
This summary is machine-generated.

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Thyroid hormone receptor disruption in Xenopus tadpoles prevents limb muscle growth and causes existing muscle fibers to disintegrate. This suggests calcium regulation issues may cause muscle degeneration, mimicking tail resorption.

Area of Science:

  • Developmental biology
  • Molecular endocrinology
  • Muscle physiology

Background:

  • Thyroid hormone is crucial for amphibian metamorphosis and development.
  • Thyroid hormone receptors (TRs) mediate hormone action.
  • Dominant-negative TRDN can interfere with normal TR function.

Purpose of the Study:

  • To investigate the role of thyroid hormone receptor in limb muscle development.
  • To understand the molecular mechanisms underlying muscle degeneration induced by TRDN.
  • To identify genes involved in TRDN-mediated muscle pathology.

Main Methods:

  • Generation of transgenic Xenopus laevis tadpoles expressing a dominant-negative thyroid hormone receptor (TRDN) under a muscle-specific promoter.
  • Inducible transgene expression using the tetracycline system with doxycycline.

Related Experiment Videos

  • Microarray analysis to identify gene expression changes in response to TRDN expression.
  • Histological examination of muscle fibers.

    • Main Results:

    • Transgenic tadpoles showed severely reduced limb muscle development.
    • Upregulation of TRDN led to disintegration of existing muscle fibers within 2 days.
    • Microarray analysis revealed altered expression of 24 muscle genes, including calsequestrin, potentially causing the muscle phenotype.
    • Downregulation of calsequestrin and other calcium-handling genes suggests a role for calcium dysregulation in muscle degeneration.
    • Gene expression changes mirrored those seen during tail resorption, indicating a switch in developmental programs.

    Conclusions:

    • Dominant-negative thyroid hormone receptor disrupts limb muscle development and causes degeneration in Xenopus tadpoles.
    • Calcium dysregulation, indicated by altered expression of calcium-handling genes like calsequestrin, may be a key mechanism in this muscle pathology.
    • The study highlights the conserved role of thyroid hormone signaling in muscle development and identifies potential molecular targets for myopathies.