Electrolyte and amino acid changes in rat brain during maturation
- 1 October 1962
- journal article
- research article
- Published by American Physiological Society in American Journal of Physiology-Legacy Content
- Vol. 203 (4), 748-752
- https://doi.org/10.1152/ajplegacy.1962.203.4.748
Abstract
Rats 1–45 days old were studied. Plasma Na and Cl concentrations changed little with age, whereas K concentration decreased. Total brain water content and total Na and Cl concentrations decreased progressively, whereas total K concentration increased during maturation. Brain Na and Cl spaces decreased with maturation. Adult brain levels were attained at approximately 21 days. Concentrations of total and protein nitrogen [trichloroacetic acid (TCA)-insoluble] fractions progressively increased with age. The lipid nitrogen fraction (TCA-insoluble and ether-ethanol-soluble) increased progressively, but not markedly, with age, whereas the concentration of TCA-soluble nitrogen did not appear to change during maturation Changes in brain free amino acid concentrations during maturation were as follows: glutamic, γ-aminobutyric, and aspartic acid and glutamine concentrations progressively increased during maturation. In contrast, threonine concentration did not change. Changes in brain Cl space with age were analyzed and found to support the concept that Cl is homogeneously distributed in young rats but becomes progressively more heterogeneously distributed as the animals mature.Keywords
This publication has 10 references indexed in Scilit:
- EFFECT OF MATURATION ON CHEMICALLY-INDUCED SEIZURES IN RATS1961
- THE CONCENTRATION OF ELECTROLYTES IN THE DEVELOPING NERVOUS SYSTEM WITH SPECIAL REFERENCE TO THE PERIOD OF MYELINATIONJournal of Neurochemistry, 1960
- METABOLISM OF MYELIN LIPIDS: ESTIMATION AND SEPARATION OF BRAIN LIPIDS IN THE DEVELOPING RABBITJournal of Neurochemistry, 1959
- Electric Response of Glia Cells in Cat BrainScience, 1958
- Development of Susceptibility to Seizures in Young Animals III. Brain Water, Electrolyte and Acid-Base Metabolism.Experimental Biology and Medicine, 1958
- Relation between excitability and metabolism in brain as elucidated by anticonvulsant drugsNeurology, 1958
- Age and the Water Content of Rabbit Brain PartsAmerican Journal of Physiology-Legacy Content, 1954
- THE IONIC BASIS OF ELECTRICAL ACTIVITY IN NERVE AND MUSCLEBiological Reviews, 1951
- Biochemical and physiological differentiation during morphogenesis. XI. The extracellular and intracellular phases of the liver and cerebral cortex of the fetal guinea pig as estimated from distribution of chloride and radiosodiumJournal of Cellular and Comparative Physiology, 1949
- On the weight of the parts of the brain and on the percentage of water in them according to brain weight and to age, in albino and in wild Norway ratsJournal of Comparative Neurology, 1931