期刊
JOURNAL OF NEUROCHEMISTRY
卷 134, 期 4, 页码 704-716出版社
WILEY
DOI: 10.1111/jnc.13192
关键词
5-HT2A/2C receptor autoradiography; deep sequencing; nicotine withdrawal; rat; real-time PCR
资金
- Ministry of Science and Higher Education (Warszawa) [NN401 2798 33]
- Department of Pharmacology, Institute of Pharmacology Polish Academy of Sciences (Krakow)
- Department of Cardiovascular Research, Max-Delbruck-Center for Molecular Medicine (Berlin)
- DAAD
We have previously demonstrated that nicotine withdrawal produces depression-like behavior and that serotonin (5-HT)(2A/2C) receptor ligands modulate that mood-like state. In the present study we aimed to identify the mechanisms (changes in radioligand binding, transcription or RNA-editing) related to such a behavioral outcome. Rats received vehicle or nicotine (0.4mg/kg, s.c.) for 5days in home cages. Brain 5-HT2A/2C receptors were analyzed on day 3 of nicotine withdrawal. Nicotine withdrawal increased [H-3]ketanserin binding to 5-HT2A receptors in the ventral tegmental area and ventral dentate gyrus, yet decreased binding in the nucleus accumbens shell. Reduction in [H-3]mesulergine binding to 5-HT2C receptors was seen in the ventral dentate gyrus. Profound decrease in the 5-HT2A receptor transcript level was noted in the hippocampus and ventral tegmental area. Out of five 5-HT2C receptor mRNA editing sites, deep sequencing data showed a reduction in editing at the E site and a trend toward reduction at the C site in the hippocampus. In the ventral tegmental area, a reduction for the frequency of CD 5-HT2C receptor transcript was seen. These results show that the reduction in the 5-HT2A receptor transcript level may be an auto-regulatory response to the increased receptor density in the hippocampus and ventral tegmental area during nicotine withdrawal, while decreased 5-HT2C receptor mRNA editing may explain the reduction in receptor labeling in the hippocampus.
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