Mar 27, 1995

Noradrenergic enhancement of GABA-induced input resistance changes in layer V regular spiking pyramidal neurons of rat somatosensory cortex

Brain Research
F M SesslerB D Waterhouse

Abstract

Previous in vivo studies have shown that microiontophoretic application of norepinephrine (NE) and isoproterenol (ISO) can enhance gamma-aminobutyric acid (GABA)-induced depressant responses of rat somatosensory cortical neurons. In the present investigation we have examined the transmembrane electrophysiological events which are associated with interactions between NE and GABA in layer V pyramidal neurons of rat barrel field cortex. Intracellular recordings were made from electrophysiologically identified cells in a superfused cortical tissue slice preparation before, during and after bath or microdrop application of GABA, NE and ISO, alone or in combination. GABA application produced a small depolarization from resting membrane potential associated with a reduction (22%) in input resistance. NE and ISO (10-100 microM) also produced in some cases small membrane depolarizations (1-4 mV) but little concomitant changes in input resistance. Simultaneous application of NE with GABA potentiated amino acid-induced changes in input resistance in 4 cases and antagonized (n = 4) or had no effect (n = 4) on GABA-associated membrane events in 8 other cases. When the alpha-blocker, phentolamine (20 microM), was added to the medium, NE-indu...Continue Reading

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Mentioned in this Paper

8-Bromo Cyclic Adenosine Monophosphate, Monosodium Salt
Colforsin
Microelectrodes
Cortex Bone Disorders
Adrenal Cortex Diseases
Protoplasm
Resting Potentials
Neurons
8-Bromo Cyclic Adenosine Monophosphate, Sodium Salt
Internal Pyramidal Layer of Cerebral Cortex

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