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[Quantitative morphologic studies on hypoxically cultured rat myocardial cells]

H Hermersdörfer, U Karsten, W Schulze

    Acta Biologica Et Medica Germanica
    |January 1, 1976
    PubMed
    Summary

    Neonatal rat heart cells cultured under low oxygen (hypoxia) showed enlarged, irregular mitochondria. Normoxic conditions led to more numerous, smaller mitochondria, impacting cell structure.

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    Area of Science:

    • Cell Biology
    • Mitochondrial Research
    • Cardiovascular Science

    Background:

    • Neonatal rat ventricle cells are a model for studying cardiac muscle development and response to environmental factors.
    • Oxygen partial pressure (pO2) is critical for cellular metabolism and function, particularly in energy-intensive tissues like the heart.

    Purpose of the Study:

    • To investigate the effects of varying oxygen partial pressure (pO2) on the fine structure of neonatal rat ventricle cells.
    • To analyze stereologically the changes in mitochondrial morphology and organelle ratios under hypoxic and normoxic conditions.

    Main Methods:

    • Neonatal rat ventricle cells were cultured for one week under controlled pericellular pO2 (38 mm Hg - normoxic, 0.6 mm Hg - hypoxic).
    • Cells were harvested on days 2 and 8 for electron microscopy.
    • Stereologic techniques were applied to examine electron micrographs.

    Main Results:

    • Hypoxic conditions (0.6 mm Hg pO2) resulted in an increase of larger, irregular mitochondria lacking cristae.
    • Normoxic conditions (28 mm Hg pO2) led to an increase in the number of smaller mitochondria with normal inner membrane arrangement.
    • The mitochondria-to-myofibrils ratio decreased in both conditions; sarcoplasmic reticulum-to-myofibrils ratio decreased markedly under hypoxia.

    Conclusions:

    • Oxygen supply significantly influences mitochondrial morphology and cellular composition in neonatal rat heart cells.
    • Hypoxia induces distinct mitochondrial ultrastructural changes, suggesting adaptive responses to low oxygen environments.
    • These findings highlight the sensitivity of cardiac cells to oxygen levels and their impact on organelle dynamics.

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