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Substance P-containing pyramidal neurons in the cat somatic sensory cortex
1Institute of Human Physiology, University of Ancona, Italy.
The Journal of Comparative Neurology
|August 1, 1992
Summary
Researchers identified substance P in a subpopulation of cat neocortical pyramidal neurons. These neurons project to sensory cortex and dorsal column nuclei, confirming their pyramidal classification.
Area of Science:
- Neuroscience
- Cell Biology
Background:
- Substance P is a neuropeptide found in the central nervous system.
- The role of substance P in neocortical pyramidal neurons is not fully understood.
Purpose of the Study:
- To investigate the presence and characteristics of substance P in neocortical pyramidal neurons in the cat's first somatic sensory cortex.
- To determine if substance P-positive neurons are projection neurons.
Main Methods:
- Light and electron microscopic immunocytochemistry.
- Combined retrograde transport-immunocytochemical experiments using colloidal gold-labeled wheat germ agglutinin.
Main Results:
- Approximately 3% of cortical neurons were substance P-positive, mostly non-pyramidal.
- 10% of substance P-positive neurons exhibited pyramidal cell morphology in layers III and V.
- Substance P-positive neurons were found to project to both cortical and subcortical targets.
Conclusions:
- A subpopulation of substance P-positive neurons in the cat's somatic sensory cortex displays characteristics of pyramidal neurons.
- These neurons are likely sources of immunoreactive terminals forming asymmetric synapses on dendritic spines.
- The findings confirm that these substance P-positive neurons are projection neurons, fulfilling criteria for pyramidal cell classification.