Regulatory interactions among axon terminals affecting the release of different transmitters from rat striatal slices under hypoxic and hypoglycemic conditions

E. Milusheva, M. Doda, E. Pasztor, A. Lajtha, H. Sershen, E. Vízi

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

An in vitro model of ischemia was utilized to study the effects of both oxygen and glucose depletion on transmitter release from rat striatal slices. The spontaneous and stimulation-evoked releases of tritiated dopamine, γ-aminobutyric acid, glutamate, and acetylcholine were measured. Hypoxia increased the evoked release of glutamate and dopamine without effect on the resting release. In contrast, hypoglycemia itself increased the resting release of dopamine. Hypoxia in combination with hypoglycemia provoked a massive release of glutamate, dopamine, and γ-aminobutyric acid. The effect on acetylcholine release was less pronounced. Ca2+ withdrawal partly reduced the effect of hypoxia combined with hypoglycemia on dopamine release and application of tetrodotoxin (1 μM) abolished it. MK-801 (3 μM), an N-methyl-D-aspartate receptor antagonist, attenuated the effect of hypoxia and hypoglycemia on [3H]dopamine release. ω-Conotoxin (0.1 μM) had a similar effect on stimulation-evoked release under a hypoxic condition. The D2 receptor antagonist sulpiride (100 μM) failed to enhance the release of [3H]acetylcholine in hypoxia combined with hypoglycemia. It was suggested that in response to hypoxia combined with hypoglycemia there is a massive release of glutamate due to the increased firing rate which in turn releases dopamine from the axon terminals through stimulation of presynaptic N-methyl-D-aspartate receptors. Dopaminergic inhibitory control on ACh release seems not to be operative under conditions of hypoxia combined with hypoglycemia.

Original languageEnglish
Pages (from-to)946-952
Number of pages7
JournalJournal of Neurochemistry
Volume59
Issue number3
Publication statusPublished - Sep 1992

Fingerprint

Corpus Striatum
Presynaptic Terminals
Hypoglycemia
Hypoglycemic Agents
Rats
Transmitters
Dopamine
Glutamic Acid
Acetylcholine
Aminobutyrates
N-Methyl-D-Aspartate Receptors
Conotoxins
Sulpiride
Dopamine Agents
Dizocilpine Maleate
Tetrodotoxin
Hypoxia
Axons
Ischemia
Oxygen

Keywords

  • Hypoglycemia
  • Hypoxia
  • Neurotransmitter release
  • Striatum

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

Cite this

Regulatory interactions among axon terminals affecting the release of different transmitters from rat striatal slices under hypoxic and hypoglycemic conditions. / Milusheva, E.; Doda, M.; Pasztor, E.; Lajtha, A.; Sershen, H.; Vízi, E.

In: Journal of Neurochemistry, Vol. 59, No. 3, 09.1992, p. 946-952.

Research output: Contribution to journalArticle

@article{0dbb893261754feab9321ea0501ac20b,
title = "Regulatory interactions among axon terminals affecting the release of different transmitters from rat striatal slices under hypoxic and hypoglycemic conditions",
abstract = "An in vitro model of ischemia was utilized to study the effects of both oxygen and glucose depletion on transmitter release from rat striatal slices. The spontaneous and stimulation-evoked releases of tritiated dopamine, γ-aminobutyric acid, glutamate, and acetylcholine were measured. Hypoxia increased the evoked release of glutamate and dopamine without effect on the resting release. In contrast, hypoglycemia itself increased the resting release of dopamine. Hypoxia in combination with hypoglycemia provoked a massive release of glutamate, dopamine, and γ-aminobutyric acid. The effect on acetylcholine release was less pronounced. Ca2+ withdrawal partly reduced the effect of hypoxia combined with hypoglycemia on dopamine release and application of tetrodotoxin (1 μM) abolished it. MK-801 (3 μM), an N-methyl-D-aspartate receptor antagonist, attenuated the effect of hypoxia and hypoglycemia on [3H]dopamine release. ω-Conotoxin (0.1 μM) had a similar effect on stimulation-evoked release under a hypoxic condition. The D2 receptor antagonist sulpiride (100 μM) failed to enhance the release of [3H]acetylcholine in hypoxia combined with hypoglycemia. It was suggested that in response to hypoxia combined with hypoglycemia there is a massive release of glutamate due to the increased firing rate which in turn releases dopamine from the axon terminals through stimulation of presynaptic N-methyl-D-aspartate receptors. Dopaminergic inhibitory control on ACh release seems not to be operative under conditions of hypoxia combined with hypoglycemia.",
keywords = "Hypoglycemia, Hypoxia, Neurotransmitter release, Striatum",
author = "E. Milusheva and M. Doda and E. Pasztor and A. Lajtha and H. Sershen and E. V{\'i}zi",
year = "1992",
month = "9",
language = "English",
volume = "59",
pages = "946--952",
journal = "Journal of Neurochemistry",
issn = "0022-3042",
publisher = "Wiley-Blackwell",
number = "3",

}

TY - JOUR

T1 - Regulatory interactions among axon terminals affecting the release of different transmitters from rat striatal slices under hypoxic and hypoglycemic conditions

AU - Milusheva, E.

AU - Doda, M.

AU - Pasztor, E.

AU - Lajtha, A.

AU - Sershen, H.

AU - Vízi, E.

PY - 1992/9

Y1 - 1992/9

N2 - An in vitro model of ischemia was utilized to study the effects of both oxygen and glucose depletion on transmitter release from rat striatal slices. The spontaneous and stimulation-evoked releases of tritiated dopamine, γ-aminobutyric acid, glutamate, and acetylcholine were measured. Hypoxia increased the evoked release of glutamate and dopamine without effect on the resting release. In contrast, hypoglycemia itself increased the resting release of dopamine. Hypoxia in combination with hypoglycemia provoked a massive release of glutamate, dopamine, and γ-aminobutyric acid. The effect on acetylcholine release was less pronounced. Ca2+ withdrawal partly reduced the effect of hypoxia combined with hypoglycemia on dopamine release and application of tetrodotoxin (1 μM) abolished it. MK-801 (3 μM), an N-methyl-D-aspartate receptor antagonist, attenuated the effect of hypoxia and hypoglycemia on [3H]dopamine release. ω-Conotoxin (0.1 μM) had a similar effect on stimulation-evoked release under a hypoxic condition. The D2 receptor antagonist sulpiride (100 μM) failed to enhance the release of [3H]acetylcholine in hypoxia combined with hypoglycemia. It was suggested that in response to hypoxia combined with hypoglycemia there is a massive release of glutamate due to the increased firing rate which in turn releases dopamine from the axon terminals through stimulation of presynaptic N-methyl-D-aspartate receptors. Dopaminergic inhibitory control on ACh release seems not to be operative under conditions of hypoxia combined with hypoglycemia.

AB - An in vitro model of ischemia was utilized to study the effects of both oxygen and glucose depletion on transmitter release from rat striatal slices. The spontaneous and stimulation-evoked releases of tritiated dopamine, γ-aminobutyric acid, glutamate, and acetylcholine were measured. Hypoxia increased the evoked release of glutamate and dopamine without effect on the resting release. In contrast, hypoglycemia itself increased the resting release of dopamine. Hypoxia in combination with hypoglycemia provoked a massive release of glutamate, dopamine, and γ-aminobutyric acid. The effect on acetylcholine release was less pronounced. Ca2+ withdrawal partly reduced the effect of hypoxia combined with hypoglycemia on dopamine release and application of tetrodotoxin (1 μM) abolished it. MK-801 (3 μM), an N-methyl-D-aspartate receptor antagonist, attenuated the effect of hypoxia and hypoglycemia on [3H]dopamine release. ω-Conotoxin (0.1 μM) had a similar effect on stimulation-evoked release under a hypoxic condition. The D2 receptor antagonist sulpiride (100 μM) failed to enhance the release of [3H]acetylcholine in hypoxia combined with hypoglycemia. It was suggested that in response to hypoxia combined with hypoglycemia there is a massive release of glutamate due to the increased firing rate which in turn releases dopamine from the axon terminals through stimulation of presynaptic N-methyl-D-aspartate receptors. Dopaminergic inhibitory control on ACh release seems not to be operative under conditions of hypoxia combined with hypoglycemia.

KW - Hypoglycemia

KW - Hypoxia

KW - Neurotransmitter release

KW - Striatum

UR - http://www.scopus.com/inward/record.url?scp=0026688177&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026688177&partnerID=8YFLogxK

M3 - Article

VL - 59

SP - 946

EP - 952

JO - Journal of Neurochemistry

JF - Journal of Neurochemistry

SN - 0022-3042

IS - 3

ER -