Non-N-methyl-D-aspartate (NMDA) receptor antagonist 1,2,3, 4-tetrahydro-6-nitro-2,3-dioxo-benzo(f)quinoxaline-7-sulphonamide (NBQX) decreases functional disorders in cytotoxic brain oedema.

Abstract:

:N-methyl-D-aspartate (NMDA) and non-NMDA receptors were found to be involved in development of functional disorders caused by hexachlorophene. In order to specify the role of glutamate receptors we studied the protective effects of the selective antagonist of the kainate/(+/-)-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptor/channel 1,2,3,4-tetrahydro-6-nitro-2, 3-dioxo-benzo[f]quinoxaline-7-sulphonamide disodium (NBQX) and of the non-competitive NMDA receptor antagonist ifenprodil tartrate on coordinative motor behaviour of adult male Wistar rats as assessed in a simple 'ladder-test'. Neurotoxic injury of the cerebrum after hexachlorophene administration and putative amelioration after treatment with test substances was demonstrated histologically. Hexachlorophene-induced motor disturbance remitted spontaneously when stopping the noxis, but remittance occurred significantly earlier when NBQX [0.45 and 0.6 mg/kg intraperitoneal (i.p.)] was applied as well. Ifenprodil (0.15 to 1.2 mg/kg) did not improve the motor function. Vacuolation of white matter of the whole cerebrum was observed after 3 weeks of treatment with hexachlorophene. These morphological alterations caused by hexachlorophene treatment [central nervous system (CNS) vacuolation] spontaneously revert only after 5-6 weeks. The 5-day duration with test substances was too short for remission of vacuolation which thus may not apply to the situation after treatment with glutamate antagonists, despite improvement of motor function. The results suggest that kainate/AMPA receptor channels are at least partially involved in the mechanism of brain damage induced by hexachlorophene, however, the polyamine binding site of the NMDA receptor evidently is not involved.

journal_name

Arch Toxicol

journal_title

Archives of toxicology

authors

Häntzschel A,Andreas K

doi

10.1007/s002040050011

keywords:

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

581-7

issue

10-11

eissn

0340-5761

issn

1432-0738

pii

00730581.204

journal_volume

73

pub_type

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