Effect of hypertonic saline on rat hypothalamic paraventricular nucleus parvocellular neurons in vitro

Neuroscience Letters
Chun-Ping ChuDe-Lai Qiu

Abstract

The effects of hypertonic saline on hypothalamic paraventricular nucleus (PVN) parvocellular neurons were examined using whole-cell patch-clamp technique. Under current-clamp, 50% (41/82) of parvocellular neurons were depolarized than the predicted values by hypertonic saline, and associated with increasing action potential frequency. Under voltage-clamp, unless hypertonic saline induced a shift of reverse potential to more positive values, neither mannitol nor hypertonic saline obviously increased the conductance in parvocellular neurons. Moreover, spontaneous excitatory postsynaptic currents (sEPSCs) were increased by isotonic increases in [Na(+)](o) in the parvocellular neurons. Bath application AMPA receptor antagonist CNQX or non-selective glutamate antagonist kynurenic acid almost completely blocked the sEPSCs. Extracellular application of gadolinium (Gd(3+)) blocked the hypertonic saline-induced response. These results suggested that subpopulation of PVN parvocellular neurons are selectively sensitive to NaCl. Hypertonic saline excited the PVN parvocellular neurons through Na(+)-detection and the excitatory glutamatergic synaptic input.

References

Jan 1, 1983·Annual Review of Neuroscience·L W Swanson, P E Sawchenko

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Citations

Jul 4, 2012·Experimental Neurology·Thekkethil Prashant NedungadiJ Thomas Cunningham
Dec 15, 2010·The European Journal of Neuroscience·Jaclyn I Wamsteeker, Jaideep S Bains
Nov 26, 2014·British Journal of Pharmacology·C H FeethamR Barrett-Jolley
Jul 24, 2018·Frontiers in Physiology·Claire H FeethamRichard Barrett-Jolley
Apr 24, 2015·Journal of Neurophysiology·Hildebrando Candido Ferreira-NetoJavier E Stern

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