Brain stem as a target site for the metabolic side effects of olanzapine.
Published
Journal Article
Olanzapine, an atypical antipsychotic, is widely prescribed for the treatment of schizophrenia and bipolar disorder despite causing undesirable metabolic side effects. A variety of mechanisms and brain sites have been proposed as contributors to the side effects; however, the role of the dorsal motor nucleus of the vagus nerve (DMV), which plays a crucial role in the regulation of subdiaphragmatic organs and thus governs energy and glucose homeostasis, is largely unknown. Identifying the effect of olanzapine on the excitability of DMV neurons in both sexes is thus crucial to understanding possible underlying mechanisms. Whole cell patch-clamp electrophysiological recordings were conducted in stomach- and liver-related DMV neurons identified with retrograde viral tracers and in random DMV neurons. The effect of olanzapine on the neuronal excitability of DMV neurons both in male and female mice was established. Our data demonstrate that olanzapine hyperpolarizes the DMV neurons in both sexes and this effect is reversible. The hyperpolarization is associated with decreased firing rate and input resistance. Olanzapine also decreases the excitability of a subset of stomach- and liver-related DMV neurons. Our study demonstrates that olanzapine has a powerful effect on DMV neurons in both sexes, indicating its ability to reduce vagal output to the subdiaphragmatic organs, which likely contributes to the metabolic side effects observed in both humans and experimental models. These findings suggest that the metabolic side effects of olanzapine may partially originate in the DMV.
Full Text
Duke Authors
Cited Authors
- Anwar, IJ; Miyata, K; Zsombok, A
Published Date
- March 2016
Published In
Volume / Issue
- 115 / 3
Start / End Page
- 1389 - 1398
PubMed ID
- 26719086
Pubmed Central ID
- 26719086
Electronic International Standard Serial Number (EISSN)
- 1522-1598
International Standard Serial Number (ISSN)
- 0022-3077
Digital Object Identifier (DOI)
- 10.1152/jn.00387.2015
Language
- eng