Related Experiment Video
Updated: May 5, 2026
Convection Enhanced Delivery of Optogenetic Adeno-associated Viral Vector to the Cortex of Rhesus Macaque Under Guidance of Online MRI Images
Published on: May 23, 2019
Age-related changes to layer 3 pyramidal cells in the rhesus monkey visual cortex.
Jennifer I Luebke1, Maria Medalla2, Joseph M Amatrudo3
1Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA 02118, USA Computational Neurobiology and Imaging Center, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA and.
Aging alters brain structure but not function in rhesus monkeys. While dendritic complexity and synapse density decrease in visual cortex neurons, electrophysiology remains stable, independent of cognitive status.
Area of Science:
- Neuroscience
- Aging Research
- Primate Models
Background:
- Normal aging impacts neuronal structure and function.
- Understanding age-related changes in the brain is crucial for cognitive health.
Purpose of the Study:
- To investigate the effects of normal aging on morphologic and electrophysiologic properties of layer 3 pyramidal neurons in the primary visual cortex (V1) of rhesus monkeys.
- To correlate structural and functional changes with cognitive status in aged monkeys.
Main Methods:
- Whole-cell, patch-clamp recordings in in vitro slices.
- Electron microscopy for synaptic ultrastructure analysis.
- Computational modeling of neuronal morphology.
Main Results:
- Reduced distal apical dendritic branching complexity and total spine density in aged neurons.
- Age-related decrease in symmetric and asymmetric synapse numerical density.
- No significant differences in intrinsic membrane properties, action potential (AP) firing, or synaptic currents between aged and young neurons.
Conclusions:
- Aging leads to structural alterations in V1 neurons, including reduced dendritic complexity and synapse density.
- These structural changes are not associated with significant electrophysiologic alterations in aged rhesus monkeys.
- No correlation found between age-related structural changes and cognitive impairment.
