Neurochemical Research

, 34:2102 | Cite as

Effect of Ageing and Ischemia on Enzymatic Activities Linked to Krebs’ Cycle, Electron Transfer Chain, Glutamate and Aminoacids Metabolism of Free and Intrasynaptic Mitochondria of Cerebral Cortex

  • Roberto Federico Villa
  • Antonella Gorini
  • Siegfried Hoyer
Original Paper
First Online:
Received:
Accepted:

Abstract

The effect of ageing and the relationships between the catalytic properties of enzymes linked to Krebs’ cycle, electron transfer chain, glutamate and aminoacid metabolism of cerebral cortex, a functional area very sensitive to both age and ischemia, were studied on mitochondria of adult and aged rats, after complete ischemia of 15 minutes duration. The maximum rate (V max) of the following enzyme activities: citrate synthase, malate dehydrogenase, succinate dehydrogenase for Krebs’ cycle; NADH-cytochrome c reductase as total (integrated activity of Complex I–III), rotenone sensitive (Complex I) and cytochrome oxidase (Complex IV) for electron transfer chain; glutamate dehydrogenase, glutamate–oxaloacetate- and glutamate–pyruvate transaminases for glutamate metabolism were assayed in non-synaptic, perikaryal mitochondria and in two populations of intra-synaptic mitochondria, i.e., the light and heavy mitochondrial fraction. The results indicate that in normal, steady-state cerebral cortex, the value of the same enzyme activity markedly differs according (a) to the different populations of mitochondria, i.e., non-synaptic or intra-synaptic light and heavy, (b) and respect to ageing. After 15 min of complete ischemia, the enzyme activities of mitochondria located near the nucleus (perikaryal mitochondria) and in synaptic structures (intra-synaptic mitochondria) of the cerebral tissue were substantially modified by ischemia. Non-synaptic mitochondria seem to be more affected by ischemia in adult and particularly in aged animals than the intra-synaptic light and heavy mitochondria. The observed modifications in enzyme activities reflect the metabolic state of the tissue at each specific experimental condition, as shown by comparative evaluation with respect to the content of energy-linked metabolites and substrates. The derangements in enzyme activities due to ischemia is greater in aged than in adult animals and especially the non-synaptic and the intra-synaptic light mitochondria seems to be more affected in aged animals. These data allow the hypothesis that the observed modifications of catalytic activities in non-synaptic and intra-synaptic mitochondrial enzyme systems linked to energy metabolism, amino acids and glutamate metabolism are primary responsible for the physiopathological responses of cerebral tissue to complete cerebral ischemia for 15 min duration during ageing.

Keywords

Brain energy metabolism Ischemia Enzymes Glutamate and amino acids Non-synaptic and intra-synaptic mitochondria Ageing 
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Notes

Acknowledgment

We would like to thank Antonio Moretti, D. Pharm. and contract Professor at the Department of Physiological-Pharmacological Cellular-Molecular Sciences, University of Pavia, for his helpful suggestions and appropriate criticisms.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Roberto Federico Villa
    • 1
  • Antonella Gorini
    • 1
  • Siegfried Hoyer
    • 2
  1. 1.Department of Forensic Medicine and Pharmacological-Toxicological Sciences, Division of Pharmacological and Toxicological Sciences, Laboratory of Neurochemistry and Molecular MedicineUniversity of PaviaPaviaItaly
  2. 2.Department of PathologyUniversity of HeidelbergHeidelbergGermany

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