Evidence for projections from medullary nuclei onto serotonergic and dopaminergic neurons in the midbrain dorsal raphe nucleus of the rat

1992 ◽  
Vol 270 (1) ◽  
pp. 149-156 ◽  
Author(s):  
Horst Herbert
Keyword(s):  
Dopaminergic Neurons ◽  
Dorsal Raphe Nucleus ◽  
Dorsal Raphe ◽  
Raphe Nucleus ◽  
Medullary Nuclei ◽  
Dorsal Raphé

scholarly journals A Neural Correlate of Predicted and Actual Reward-Value Information in Monkey Pedunculopontine Tegmental and Dorsal Raphe Nucleus during Saccade Tasks

2011 ◽  
Vol 2011 ◽  
pp. 1-21 ◽  
Author(s):  
Ken-ichi Okada ◽  
Kae Nakamura ◽  
Yasushi Kobayashi
Keyword(s):  
Reinforcement Learning ◽  
Dopaminergic Neurons ◽  
Dorsal Raphe Nucleus ◽  
Cholinergic Neurons ◽  
Extracellular Recording ◽  
Movement Control ◽  
Dorsal Raphe ◽  
Raphe Nucleus ◽  
Pedunculopontine Tegmental Nucleus ◽  
Dorsal Raphé

Dopamine, acetylcholine, and serotonin, the main modulators of the central nervous system, have been proposed to play important roles in the execution of movement, control of several forms of attentional behavior, and reinforcement learning. While the response pattern of midbrain dopaminergic neurons and its specific role in reinforcement learning have been revealed, the role of the other neuromodulators remains rather elusive. Here, we review our recent studies using extracellular recording from neurons in the pedunculopontine tegmental nucleus, where many cholinergic neurons exist, and the dorsal raphe nucleus, where many serotonergic neurons exist, while monkeys performed eye movement tasks to obtain different reward values. The firing patterns of these neurons are often tonic throughout the task period, while dopaminergic neurons exhibited a phasic activity pattern to the task event. The different modulation patterns, together with the activity of dopaminergic neurons, reveal dynamic information processing between these different neuromodulator systems.

Buspirone-induced changes in the serotonergic and non-serotonergic cells in the dorsal raphe nucleus of rats

2010 ◽  
Vol 473 (2) ◽  
pp. 136-140 ◽  
Author(s):  
Ali Jahanshahi ◽  
Lee Wei Lim ◽  
Harry W.M. Steinbusch ◽  
Veerle Visser-Vandewalle ◽  
Yasin Temel
Keyword(s):  
Dorsal Raphe Nucleus ◽  
Dorsal Raphe ◽  
Raphe Nucleus ◽  
Induced Changes ◽  
Dorsal Raphé

027 GABAergic Neurons in the Dorsal Raphe Nucleus Are under the Influence of GABAergic Inputs from the Nucleus Pontis Oralis

SLEEP ◽  
2021 ◽  
Vol 44 (Supplement_2) ◽  
pp. A12-A12
Author(s):  
Jianhua Zhang ◽  
Mingchu Xi ◽  
Simon Fung ◽  
Charles Tobin ◽  
Sharon Sampogna ◽  
...  
Keyword(s):  
Dorsal Raphe Nucleus ◽  
Dorsal Raphe ◽  
Gabaergic Neurons ◽  
Fluorescent Labeling ◽  
Raphe Nucleus ◽  
Gaba A ◽  
Adult Cats ◽  
Immunohistochemical Techniques ◽  
Fluorescence Immunohistochemistry ◽  
Dorsal Raphé

Abstract Introduction Our previous study has shown that there is a direct connection between GABAergic neurons in the nucleus pontis oralis (NPO) and neurons of the dorsal raphe nucleus (DR), providing a morphological basis for the hypothesis that GABAergic inhibitory processes in NPO play an important role in the generation and maintenance of wakefulness as well as active (REM) sleep through the interaction with neurons in the DR. However, the target of such a GABAergic projection from the NPO within the DR is unknown. In the present study, a double-fluorescent labeling technique was employed to examine the target of GABAergic inputs to the DR. Methods Adult cats were deeply anesthetized and perfused transcardially. Subsequently, the brainstem containing the DR was removed, postfixed and cut into 15 μm coronal sections with a Reichert-Jung cryostat. The sections were immunostained with antibodies against GABA-A or GABA-B receptors and GABA following the procedure of double fluorescence immunohistochemistry. Results Under fluorescence microscopy, a large number of neurons were labeled with antibodies against either GABA-A receptor or GABA-B receptor. In addition, neurons labeled with antibody against GABA were observed in the DR. With double fluorescence immunohistochemical techniques, some neurons labeled by anti-GABA antibody were also stained with antibodies against GABA-A or GABA-B receptors. Conclusion The expression of GABA-A or GABA-B receptors by GABAergic neurons in the DR indicates that GABAergic neurons in the DR receive GABAergic inputs. Our previous study has demonstrated that these GABAergic inputs are from the NPO. These data provide a morphological foundation to support our hypothesis that, during wakefulness, NPO GABAergic “Executive” neurons suppress “Second-Order” GABAergic neurons in the DR, which, in turn, activate (disinhibit) serotonergic wake-on neurons in this nucleus. Support (if any) NS092383

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