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[Intracellular distribution of NADP-dependent isocitrate dehydrogenase activity in the tissues of chickens in
Insights
Activity of NAD(P)-dependent isocitrate dehydrogenase in chick liver and brain changes during development. Mitochondrial activity predominates in the embryonic liver, while cytoplasmic activity is higher in adults. Brain mitochondria show a greater increase in activity.
Area of Science:
- Biochemistry
- Developmental Biology
- Enzymology
Context:
- Investigates the ontogenetic distribution of NAD(P)-dependent isocitrate dehydrogenase (IDH).
- Focuses on the compartmentalization of IDH activity in chick liver and brain cytoplasm and mitochondria.
- Examines developmental changes in enzyme activity during embryogenesis and postembryonic stages.
Purpose:
- To characterize the developmental patterns of NAD(P)-dependent IDH activity in different cellular compartments of chick liver and brain.
- To compare the distribution and changes in IDH activity between liver and brain tissues during ontogenesis.
- To elucidate the role of IDH in metabolic adaptations during chick development.
Summary:
- NAD(P)-dependent isocitrate dehydrogenase activity significantly increases in both liver fractions during chick embryogenesis, with higher mitochondrial predominance.
- Postembryonic development shows a shift, with the majority of liver IDH activity localizing to the cytoplasm.
- In chick brain, while overall IDH activity is lower, mitochondrial activity increases more substantially during development, surpassing cytoplasmic levels.
Impact:
- Provides insights into the metabolic regulation and developmental roles of IDH in avian tissues.
- Highlights tissue-specific and compartment-specific adaptations of IDH during ontogeny.
- Contributes to understanding the biochemical basis of developmental processes in vertebrates.
Abstract:
The distribution of activity of NAD . P-dependent isocitrate dehydrogenase in the chick liver and brain cytoplasm and mitochondria was studied during ontogenesis. A marked increase of its activity was found in both liver fractions during embryogenesis, with the predominance in mitochondria; the major part of its activity during postembryonic development is localized in the cytoplasm. In the brain tissues where this enzyme is less active in both the factions its activity increased to a greater extent in the mitochondria and exceeded markedly that in the cytoplasm.