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Neurotensin and the serotonergic system
1Department of Psychiatry, Yale University School of Medicine, Connecticut Mental Health Center, New Haven 06508, USA.
Progress in Neurobiology
|August 1, 1997
Summary
Neurotensin excites some serotonergic neurons in the brain, potentially influencing functions like pain and sleep. This interaction may explain how the neurotensin system regulates these processes via serotonin.
Area of Science:
- Neuroscience
- Neuropharmacology
Background:
- The serotonergic system regulates vital functions like nociception, sleep, and autonomic control.
- Neurotensin is widely distributed in areas with serotonergic neurons, but their interaction is poorly understood.
Purpose of the Study:
- Review the anatomical relationship between neurotensin and serotonin systems.
- Summarize neurotensin's effects on serotonergic neurons.
- Discuss the physiological relevance of this neurotensin-serotonin interaction.
Main Methods:
- Review of existing literature on neurotensin and serotonergic systems.
- Analysis of neurotensin's action on serotonergic neuron firing rates.
- Intracellular recordings to study neurotensin's effects on neuronal currents.
Main Results:
- Neurotensin-containing neurons and receptors are present in raphe nuclei, key serotonin centers.
- Neurotensin increases firing rate in a subpopulation of dorsal raphe serotonergic neurons.
- Neurotensin induces inward currents in some neurons, with desensitization observed.
Conclusions:
- Neurotensin modulates serotonergic neuron activity, particularly in the dorsal raphe nucleus.
- This interaction may mediate neurotensin's roles in nociception, sleep, and autonomic regulation.
- Further research is needed to fully elucidate the physiological impact of this system interplay.