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Localization of substance P in neuronal pathways.
Ciba Foundation Symposium
|January 1, 1982
Summary
Substance P, a neuropeptide, is found in sensory neurons and plays a role in nerve signaling. This study investigates its presence and function in various neural pathways, including the striatonigral projection and sensory-autonomic interactions.
Area of Science:
- Neuroscience
- Immunohistochemistry
- Electron Microscopy
Background:
- Substance P is a key neuropeptide involved in neuronal signaling.
- Its distribution and synaptic connections are crucial for understanding neural pathways.
Purpose of the Study:
- To investigate the distribution and synaptic organization of substance P-containing neuronal systems.
- To explore the role of substance P in sensory-autonomic interactions.
Main Methods:
- Immunohistochemistry to visualize substance P.
- Electron microscopy to examine synaptic structures.
- Surgical denervation and capsaicin administration to assess substance P depletion.
Main Results:
- Substance P-immunoreactive terminals in the substantia nigra form both symmetrical and asymmetrical synapses.
- Sensory denervation and capsaicin deplete substance P in the trigeminal nerve and skin.
- Substance P-containing fibers in prevertebral ganglia originate from dorsal root ganglia and interact synaptically with sympathetic neurons.
Conclusions:
- Substance P exhibits diverse synaptic connections in the central and peripheral nervous systems.
- Substance P plays a significant role in sensory-autonomic communication within prevertebral ganglia.