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J Chem Neuroanat. 2014 May;57-58:15-23. doi: 10.1016/j.jchemneu.2014.03.001. Epub 2014 Apr 3.

Cellular profile of the dorsal raphe lateral wing sub-region: relationship to the lateral dorsal tegmental nucleus.

Author information

1
Temple University School of Medicine, Center for Substance Abuse Research, MERB 8th Floor, Philadelphia, PA 19140, United States; Drexel University College of Medicine, Department of Neurobiology & Anatomy, Queen Lane Campus, Philadelphia, PA 19129, United States. Electronic address: rkvasudeva@gmail.com.
2
Drexel University College of Medicine, Department of Neurobiology & Anatomy, Queen Lane Campus, Philadelphia, PA 19129, United States. Electronic address: Barry.Waterhouse@drexelmed.edu.

Abstract

As one of the main serotonergic (5HT) projections to the forebrain, the dorsal raphe nucleus (DRN) has been implicated in disorders of anxiety and depression. Although the nucleus contains the densest population of 5HT neurons in the brain, at least 50% of cells within this structure are non-serotonergic, including a large population of nitric oxide synthase (NOS) containing neurons. The DRN has a unique topographical efferent organization and can also be divided into sub-regions based on rostro-caudal and medio-lateral dimensions. NOS is co-localized with 5HT in the midline DRN but NOS-positive cells in the lateral wing (LW) of the nucleus do not express 5HT. Interestingly, the NOS LW neuronal population is immediately rostral to and in line with the cholinergic lateral dorsal tegmental nucleus (LDT). We used immunohistochemical methods to investigate the potential serotonergic regulation of NOS LW neurons and also the association of this cell grouping to the LDT. Our results indicate that >75% of NOS LW neurons express the inhibitory 5HT1A receptor and are cholinergic (>90%). The findings suggest this assembly of cells is a rostral extension of the LDT, one that it is subject to regulation by 5HT release. As such the present study suggests a link between 5HT signaling, activation of cholinergic/NOS neurons, and the stress response including the pathophysiology underlying anxiety and depression.

KEYWORDS:

Acetylcholine; Dorsal raphe; Lateral dorsal tegmental nucleus; Nitric oxide synthase; Serotonin

PMID:
24704911
PMCID:
PMC4065778
DOI:
10.1016/j.jchemneu.2014.03.001
[Indexed for MEDLINE]
Free PMC Article

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