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FINE ARCHITECTURE OF THE HIPPOCAMPUS IN ADOLESCENT, ADULT AND AGED RATS. ELECTRON MICROSCOPIC STUDY.

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Aging in male Wistar rats causes significant ultrastructural changes in the hippocampus, particularly affecting lipofuscin concentration and neuronal mitochondria. These findings highlight age-related alterations in neurotransmission and neuronal development.

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Area of Science:

  • Neuroscience
  • Aging Research
  • Cell Biology

Background:

  • The aging process affects various physiological systems, including the brain.
  • Understanding age-related changes at the ultrastructural level is crucial for comprehending functional decline.

Purpose of the Study:

  • To investigate and compare the hippocampal ultrastructure across different age groups of male Wistar rats.
  • To identify specific age-dependent ultrastructural modifications in the rat hippocampus.

Main Methods:

  • Electron microscopy was used to examine hippocampal tissue from adolescent, adult, and aged male Wistar rats.
  • Four rats per age group (P30-36, P125-130, P330-340) were utilized.
  • Animal care and procedures adhered to European Union directives.

Main Results:

  • Adolescent and adult rat hippocampi exhibited similar ultrastructures.
  • Aged rats showed significant ultrastructural differences compared to adults.
  • Key changes in aged rats included increased lipofuscin, damaged cytoplasmic organelles, altered presynaptic vesicle and mitochondrial quantities, and rare apoptotic signs in neurons.

Conclusions:

  • Hippocampal aging in rats induces selective ultrastructural changes.
  • These modifications suggest alterations in neurotransmission and neuronal developmental pathways associated with aging.