Journal
NEUROSCIENCE
Volume 404, Issue -, Pages 459-469Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuroscience.2019.02.017
Keywords
subfornical organ; dissociated neuronal culture; gold nanoparticle RNA probe; patch clamp; voltage gated ion current
Categories
Funding
- Natural Sciences and Engineering Council of Canada (NSERC)
- Research Manitoba
- University of Manitoba Graduate Fellowship
- GETS program
- NSERC Undergraduate Summer Research Award
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The subfornical organ (SFO) is forebrain sensory circumventricular organ, characterized by lack of a blood-brain barrier. Neurons of the SFO can detect circulating molecules such as peptide hormones and communicate this information to regulatory centers behind the blood-brain barrier, thus playing a critical role in homeostatic processes including regulation of energy balance, hydromineral balance and cardiovascular control. The SFO contains two subregions defined by neuronal expression of molecular markers: the dorsolateral peripheral or shell SFO (sSFO) neurons express calretinin, and the ventromedial core (cSFO) neurons express calbindin D28K. Neurons from these two subregions project to different locations to subserve different roles in homeostatic regulation. It is unknown whether neurons from these two subregions exhibit unique or identifiable electrophysiological properties. This study used a gold nanoparticle-conjugated RNA fluorescent probe on dissociated SFO neuron cultures and patch clamp electrophysiology to characterize the intrinsic electrophysiological properties of cSFO and sSFO neurons. Our studies revealed that neurons originating from the core region exhibited significantly more action potential bursting, while neurons from non-core regions exhibited more tonic firing neurons, albeit at a higher overall frequency. The difference in activity is correlated with a more depolarized resting membrane potential and a higher density of voltage gated Na+ currents. (C) 2019 Published by Elsevier Ltd on behalf of IBRO.
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