[Synaptic changes in cortical and subcortical brain formations in old rats].

Area of Science:

• Neuroscience
• Cell Biology
• Aging Research

Background:

• Synaptic integrity is crucial for brain function.
• Aging is associated with progressive neurological decline.
• Understanding age-related synaptic changes is vital for developing interventions.

Purpose of the Study:

• To investigate ultrastructural changes in synapses in various brain regions of aged rats.
• To identify age-related damage patterns and adaptive responses in neuronal connections.

Main Methods:

• Electron microscopy was employed to examine synaptic structures.
• The study focused on sensorimotor cortex, parietal cortex, limbic cortex, hippocampus, blue spot, and hypothalamus.
• Wistar rats aged 28-30 months were used.

Main Results:

• Significant polymorphism and individual variability in ultrastructural synaptic changes were observed.
• A predominant damage to post-synaptic synapse components was evident with aging.
• Dystrophic and destructive changes were noted in both pre- and post-synaptic regions.
• Evidence of compensatory adaptive resettings in inter-neuronal links was detected.

Conclusions:

• Aging significantly impacts synaptic structure in the rat brain, with a notable vulnerability of post-synaptic elements.
• Despite degenerative changes, the aging brain exhibits adaptive mechanisms to maintain inter-neuronal communication.
• These findings highlight the complex structural remodeling occurring in the brain during senescence.