Transsynaptic tracing to dissect supraspinal serotonergic input regulating the bladder reflex in rats

Neurourology and Urodynamics
Jemin AhnShaoping Hou

Abstract

This study was designed to determine specific cell groups of the raphe nuclei (RN) that give rise to supraspinal serotonergic projections regulating the bladder reflex. Anesthetized rats underwent surgery to open the abdomen and expose the bladder. A total of 6 µL transsynaptic neuronal tracer pseudorabies virus (PRV-152), encoding for green fluorescent protein (GFP), was injected into the bladder detrusor. After 72 or 96 h, animals were perfused and the brain was dissected for processing transverse and sagittal sections. Subsequently, fluorescent immunohistochemistry for GFP and Serotonin (5-hydroxytryptamine [5-HT]) was performed in the brain sections. Under the microscope, each RN subset was characterized individually from caudal to rostral according to the atlas. GFP+ or GFP/5-HT double labeled neurons in each subset were quantified for statistical analysis. At 72-h post-infection, very few GFP+ or GFP/5-HT double-labeled neurons appeared in the brainstem and beyond. In contrast, many labeled neurons were found at these levels after 96 h. Quantitative analysis showed that the majority of infected 5-HT+ neurons were located in the pallidus, obscurus, and magnus nuclei. Conversely, very few infected neurons were found in othe...Continue Reading

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Citations

Sep 15, 2019·The Journal of Physiology·N KonthapakdeeD M Daly
Feb 18, 2020·Brain Structure & Function·Jose L Lanciego, Floris G Wouterlood
May 7, 2020·Journal of Neuroscience Methods·Li FanHongbing Xiang

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