Rat pineal exhibits two electrophysiological patterns of response to microiontophoretic norepinephrine application

Journal of Pineal Research
C Reyes-VazquezN Dafny

Abstract

The spontaneous activity of 117 pineal units was recorded in urethane-anesthetized rats. The pineal units exhibited a wide range of firing rates of which 50% were on average slower than 14 spikes per second. Superior cervical ganglion (SCG) stimulation was studied in 76 pineal units; this stimulation caused excitation in 55% of the units. Microiontophoretic application of norepinephrine (NE) induced changes of firing rates in 61% of the pineal units tested. Two patterns of activity following NE microiontophoresis was observed: increase in firing rate (64%) and decrease in firing rate (36%). NE-induced excitation was observed only in those units excited by SCG stimulation. When NE and SCG stimulation were applied together, partial summation of the excitation induced by each one alone was observed. None of the units in which NE depressed the firing rate responded to SCG stimulation. Local application of propranolol blocked the excitation initiated by SCG stimulation as well as the excitation and the depression induced by NE microiontophoresis.

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Citations

Jan 1, 1987·Experimental Brain Research·J StehleL Vollrath
Aug 1, 1996·Neuroscience·J MilinV Todorovic
Nov 1, 1991·Brain Research Bulletin·E B Naranjo-RodríguezC Reyes-Vázquez
Jan 1, 1997·Journal of Pineal Research·C Reyes-VázquezB Prieto-Gómez
Apr 18, 2020·Frontiers in Neuroscience·Susannah C LumsdenYusuf Ozgur Cakmak

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