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Human mitochondrial function during cardiac growth and development

J Marin-Garcia¹, R Ananthakrishnan, M J Goldenthal

¹The Molecular Cardiology Institute, Highland Park, NJ 08904, USA.

Molecular and Cellular Biochemistry

|June 6, 1998

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Cardiac mitochondrial function in humans shows distinct developmental patterns. While citrate synthase activity increases with age, key respiratory enzymes like cytochrome c oxidase remain stable from infancy to adulthood.

Area of Science:

Cardiology
Mitochondrial Biology
Developmental Physiology

Background:

Mitochondrial respiratory and oxidative phosphorylation function in the developing human heart are not well understood.
Understanding these processes is crucial for comprehending cardiac development and aging.

Purpose of the Study:

To investigate changes in mitochondrial enzyme activities and content in the human heart during development.
To compare the regulation of Krebs cycle enzymes with mitochondrial respiratory chain complexes.

Main Methods:

Biochemical analysis of specific enzyme activities and protein content in left ventricular tissues from 30 control individuals (neonatal to adult).
Measurement of mitochondrial DNA (mtDNA) copy number.

Main Results:

Related Experiment Videos

Citrate synthase (CS) activity and content increased with age, paralleled by increased CS polypeptide levels.
Cytochrome c oxidase (COX) and complex V specific activities, mtDNA copy number, and COX subunit II content remained unchanged throughout development.
The increase in CS activity was not related to overall mitochondrial number or coordinated with respiratory enzyme activities.

Conclusions:

Cardiac mitochondrial respiratory enzyme activity is largely stable during human development from infancy to adulthood.
Citrate synthase, a Krebs cycle enzyme, exhibits age-specific regulation distinct from mitochondrial respiratory enzymes.