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The effect of [Met]enkephalin on the periaqueductal gray neurons of the rat: an in vitro study.

Abstract：

:Intracellular and extracellular recording techniques and in vitro preparation were used to examine the effect of [Met]enkephalin on the rat periaqueductal neurons. In the 20 cells that were recorded intracellularly, [Met]enkephalin caused an increase in the resting membrane conductance, hyperpolarization of the cell membrane, an increase in the firing threshold and a decrease in the spontaneous firing rate. This effect of [Met]enkephalin could be blocked by naloxone. The effect of [Met]enkephalin on 99 neurons was also examined using extracellular recording. In 59% of cells, pressure application of [Met]enkephalin caused a dose-dependent inhibition that could be blocked by naloxone; 15% of the cells were excited and the remaining neurons (26%) did not respond. Nineteen per cent of responsive cells were located in the dorsolateral subdivision; 41% in the ventrolateral and 13% in the dorsal regions. In 10 cells, perfusion with physiological saline solution/Mg did not alter the inhibitory effect of [Met]enkephalin. However, perfusion with physiological saline solution/Mg abolished the excitatory response to [Met]enkephalin in four cells. It is concluded that: (1) the major effect of [Met]enkephalin on periaqueductal gray cells is inhibition that occurs through a direct postsynaptic process. This inhibition is probably due to an increase in permeability to potassium; (2) a small population of periaqueductal gray cells are excited by [Met]enkephalin, probably through a presynaptic process.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Behbehani MM,Jiang M,Chandler SD

doi

10.1016/0306-4522(90)90035-3

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

373-80

issue

2

eissn

0306-4522

issn

1873-7544

pii

0306-4522(90)90035-3

journal_volume

38

pub_type

杂志文章

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