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Changes in calcium uptake rate by rat cardiac mitochondria during postnatal development

R A Bassani1, M M Fagian, J W Bassani

  • 1Centro de Engenharia Biomédica and Departmento de Engenharia Biomédica, Faculdade de Engenharia Elétrica e de Computação, Universidade Estadual de Campinas, 13083-970 Campinas, SP, Brazil.

Journal of Molecular and Cellular Cardiology
|November 4, 1998
PubMed
Summary

Rat cardiac mitochondria exhibit high calcium (Ca2+) uptake capacity shortly after birth, which significantly declines during early postnatal development. This age-related decrease in Ca2+ uptake is attributed to the uniporter itself, not altered mitochondrial membrane potential.

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Area of Science:

  • Mitochondrial physiology
  • Cardiac bioenergetics
  • Developmental biology

Background:

  • Mitochondrial calcium (Ca2+) handling is crucial for cardiac function and cellular signaling.
  • Postnatal development involves significant physiological adaptations in cardiac mitochondria.
  • Understanding age-related changes in mitochondrial Ca2+ uptake is vital for assessing cardiac health.

Purpose of the Study:

  • To investigate age-dependent changes in Ca2+ uptake and mitochondrial membrane potential in rat ventricular mitochondria.
  • To determine the impact of postnatal development on the kinetics and driving forces of mitochondrial Ca2+ transport.

Main Methods:

  • Isolated rat ventricular mitochondria were used, aged from 3 days to 5 months.
  • Measurements included Ca2+ uptake, transmembrane electrical potential (Deltapsim), and oxygen consumption.

Related Experiment Videos

  • Ruthenium red-sensitive Ca2+ uptake, respiration rates (state 3 and 4), and valinomycin-induced K+ efflux were assessed.

    • Main Results:

    • Maximal Ca2+ uptake rate (Vmax) was significantly higher in neonates (3-6 days) and decreased with age, while affinity (K0.5) remained unchanged.
    • Adult and neonatal mitochondria showed comparable state 3/4 respiration rates and Deltapsim values under basal conditions.
    • Respiration-independent Ca2+ uptake rate was significantly higher in neonates compared to adults.

    Conclusions:

    • Rat cardiac mitochondrial Ca2+ uptake capacity is highest immediately after birth and diminishes rapidly within the first postnatal weeks.
    • The decline in Ca2+ uptake is primarily due to alterations in the Ca2+ uniporter, not changes in the mitochondrial membrane potential.
    • These findings highlight critical developmental changes in cardiac mitochondrial calcium handling.