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Related Experiment Videos

Developmentally induced changes in rat lung malic enzyme activities.

E T Cabacungan1, P T Nhamburo, I B Hopkins

  • 1Department of Pediatrics, University of Maryland School of Medicine, Baltimore, USA.

Experimental Lung Research
|November 15, 2000
PubMed
Summary
This summary is machine-generated.

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Malic enzyme activity in rat lungs is higher in mitochondria than cytosol. Mitochondrial activity peaks during late fetal development, suggesting alternative energy sources, while cytosolic activity supports fatty acid and surfactant synthesis for lung maturation.

Area of Science:

  • Biochemistry
  • Developmental Biology
  • Pulmonology

Background:

  • Lung development involves complex metabolic shifts.
  • Malic enzyme (ME) plays a role in cellular metabolism and NADPH production.
  • Understanding ME activity during lung development is crucial for assessing metabolic adaptations.

Purpose of the Study:

  • To investigate the activity and kinetics of both cytosolic and mitochondrial malic enzyme in rat lungs across different developmental stages.
  • To correlate malic enzyme activity with specific phases of lung development, from fetal to postnatal life.

Main Methods:

  • Assay of malic enzyme activity by measuring 14CO2 production from 14C-malate in rat lung cytosolic and mitochondrial fractions.
  • Analysis of enzyme kinetics (Km and Vmax) at specific developmental time points.

Related Experiment Videos

  • Comparison of enzyme activities between fetal and postnatal stages.

    • Main Results:

    • Mitochondrial malic enzyme activity was consistently higher than cytosolic activity across all studied ages.
    • Mitochondrial malic enzyme activity peaked during the canalicular stage (days 19-20) of fetal lung development.
    • Cytosolic malic enzyme activity was significantly higher in all fetal stages compared to postnatal stages.
    • Mitochondrial fraction at day 19 exhibited biphasic kinetics, while the cytosolic fraction showed a single Km.

    Conclusions:

    • Increased mitochondrial malic enzyme activity in late gestation suggests non-glucose anaplerotic substrates contribute to fetal lung energy.
    • Elevated prenatal cytosolic malic enzyme activity indicates its role in providing NADPH for de novo fatty acid and surfactant synthesis, essential for lung maturation.