Ipsilateral and contralateral serotonergic projections from dorsal and median raphe nuclei to the forebrain in rats: immunofluorescence quantitative analysis

Neuroscience Research
Kouta KannoKorehito Yamanouchi

Abstract

The objective of this study was to clarify the 5-HT projections from the right and left sides of the dorsal (DRD), ventral (DRV) and lateral (DRL) subdivisions of the middle level of the dorsal (DR) raphe nucleus and median (MR) raphe nucleus to the lateral septum (LS), preoptic area (POA) or ventromedial hypothalamus (VMH), which are important neural substrates for neuroendocrine regulation of reproduction. A retrograde neural tracer, Fluoro-Gold (FG), was infused into the right side of these regions in ovariectomized rats and the numbers of FG and/or 5-HT immunopositive cells in the right and left sides of the raphe nuclei were counted. It was found that the POA and VMH received more 5-HT projections than the LS from the DR and MR. In the subdivisions of the DR, 70% of all 5-HT projections from the DR to these 3 areas originated from the DRL. Furthermore, ipsilateral projections from the DR to the POA and VMH but not to the LS were dominant, compared to the contralateral projections. A right-left difference was not seen among the MR 5-HT projections. Thus, laterality of the projections is thought to be strong in the 5-HT clusters located far from the midline of the midbrain raphe nuclei.

References

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Citations

Feb 9, 2013·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Jennifer L LapierreJerome M Siegel
Dec 3, 2013·Anatomical Science International·Hiroyuki ItoKorehito Yamanouchi
Jan 30, 2010·Neuroscience·G S KranzR Lanzenberger
Dec 16, 2010·Journal of Neuropathology and Experimental Neurology·Julie A WixeyKathryn M Buller
Dec 9, 2015·Reproductive Biology and Endocrinology : RB&E·María E AyalaAndrés Aragón
Apr 5, 2011·Neuroscience Letters·Hideo Shimizu, Korehito Yamanouchi
Jun 12, 2019·Connective Tissue Research·Gabrielle FrameChristine M Dengler-Crish

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