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Related Experiment Videos

Mice without myoglobin

D J Garry1, G A Ordway, J N Lorenz

  • 1Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235, USA.

Nature
|November 6, 1998
PubMed
Summary
This summary is machine-generated.

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Myoglobin, a protein in muscle cells, is not essential for exercise or reproduction in mice. Mice lacking myoglobin showed normal fertility and exercise capacity, challenging previous assumptions about its role.

Area of Science:

  • Physiology
  • Molecular Biology
  • Mammalian Biology

Background:

  • Myoglobin is an intracellular haemoprotein found in vertebrate heart and skeletal muscles.
  • It is hypothesized to facilitate oxygen transport from erythrocytes to mitochondria.
  • This transport is thought to maintain cellular respiration during high physiological demand.

Purpose of the Study:

  • To investigate the necessity of myoglobin for physiological functions in mammals.
  • To assess the impact of myoglobin absence on exercise capacity and reproductive success.
  • To explore the role of myoglobin in oxygen transport and metabolic regulation in muscles.

Main Methods:

  • Gene-knockout technology was used to generate mice lacking myoglobin.
  • These mice were assessed for fertility, exercise capacity, and ventilatory response to hypoxia.

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  • Muscle function was evaluated using in vitro assays under various work and oxygen conditions.

    • Main Results:

    • Mice without myoglobin were fertile and displayed normal exercise capacity.
    • The ventilatory response to hypoxia was normal in myoglobin-deficient mice.
    • Heart and soleus muscles were depigmented but functionally normal in standard assays.

    Conclusions:

    • Myoglobin is not essential for meeting the metabolic demands of pregnancy or exercise in terrestrial mammals.
    • The absence of myoglobin does not impair muscle function under tested conditions.
    • Further research is needed to understand oxygen transport and metabolic regulation in working muscles without myoglobin.