Hypoxic cell death in human NT2-N neurons

Involvement of NMDA and non- NMDA glutamate receptors

Terje Rootwelt, Michelle Dunn, Marc Yudkoff, Takayuki Ito, Runar Almaas, David E Pleasure

Research output: Contribution to journalArticle

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Abstract

Human NTera2 teratocarcinoma cells were differentiated into postmitotic NT2-N neurons and exposed to hypoxia for 6 h. The cultures were evaluated microscopically, and percent lactate dehydrogenase (LDH) release after 24 and 48 h was used as an assay for cell death. After 48 h LDH release was 24.3 ± 5.6% versus 13.8 ± 3.7% in controls (p < 0.001). Cell death was greatly diminished by MK-801 pretreatment (15.4 ± 5.1%, p < 0.001). If glutamine was omitted from the medium, glutamate levels after 6 h of hypoxia were reduced from 101 ± 63 to 2.3 ± 0.3 μM, and cell death at 48 h was also markedly reduced (15.4 ± 4.5%, p < 0.001). The α-amino-3-hydroxy-5-methylisoxazole- 4-propionate antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (18.7 ± 5.1%, p < 0.001)and mild hypothermia (33.5-34°C) during hypoxia (19.5 ± 2.7%, p < 0.05) were moderately protective. Basic fibroblast growth factor (24.1 ± 3.2%), the nitric oxide synthase inhibitor N(G)-nitro-L-arginine methyl ester (22.8 ± 8.1%), the antioxidant N-tert-butyl-o-phenylnitrone (18.9 ± 5.9%), and the 21-aminosteroid U74389G (24.0 ± 3.4%) did not protect the cells. N- Acetyl-L-cysteine even tended to increase cell death (30.1 ± 2.5%, p = 0.06). Treatment with MK-801 at the end of hypoxia did not reduce cell death (23.3 ± 2.3%). In separate experiments, a 15-min exposure to 1 mM glutamate without hypoxia did not result in significant cell death (14.7 ± 2.4 vs. 12.2 ± 2.1%, p = 0.07). We conclude that, although somewhat resistant to glutamate toxicity when normoxic, NT2-N neurons die via an ionotropic glutamate receptor-mediated mechanism when exposed to hypoxia in the presence of glutamate. As far as we know, this is the first reported analysis of the mechanism of hypoxic cell death in cultured human neuronlike cells.

Original languageEnglish (US)
Pages (from-to)1544-1553
Number of pages10
JournalJournal of Neurochemistry
Volume71
Issue number4
StatePublished - Oct 1998
Externally publishedYes

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Glutamate Receptors
Cell death
N-Methylaspartate
N-Methyl-D-Aspartate Receptors
Neurons
Cell Death
Glutamic Acid
Dizocilpine Maleate
L-Lactate Dehydrogenase
Hypothermia
Teratocarcinoma
6-Cyano-7-nitroquinoxaline-2,3-dione
Ionotropic Glutamate Receptors
NG-Nitroarginine Methyl Ester
Propionates
Acetylcysteine
Fibroblast Growth Factor 2
Glutamine
Nitric Oxide Synthase
Toxicity

Keywords

  • Excitotoxicity
  • Human
  • Hypoxia
  • Neuron
  • NT2-N neurons

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

Cite this

Hypoxic cell death in human NT2-N neurons : Involvement of NMDA and non- NMDA glutamate receptors. / Rootwelt, Terje; Dunn, Michelle; Yudkoff, Marc; Ito, Takayuki; Almaas, Runar; Pleasure, David E.

In: Journal of Neurochemistry, Vol. 71, No. 4, 10.1998, p. 1544-1553.

Research output: Contribution to journalArticle

Rootwelt, T, Dunn, M, Yudkoff, M, Ito, T, Almaas, R & Pleasure, DE 1998, 'Hypoxic cell death in human NT2-N neurons: Involvement of NMDA and non- NMDA glutamate receptors', Journal of Neurochemistry, vol. 71, no. 4, pp. 1544-1553.
Rootwelt, Terje ; Dunn, Michelle ; Yudkoff, Marc ; Ito, Takayuki ; Almaas, Runar ; Pleasure, David E. / Hypoxic cell death in human NT2-N neurons : Involvement of NMDA and non- NMDA glutamate receptors. In: Journal of Neurochemistry. 1998 ; Vol. 71, No. 4. pp. 1544-1553.
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abstract = "Human NTera2 teratocarcinoma cells were differentiated into postmitotic NT2-N neurons and exposed to hypoxia for 6 h. The cultures were evaluated microscopically, and percent lactate dehydrogenase (LDH) release after 24 and 48 h was used as an assay for cell death. After 48 h LDH release was 24.3 ± 5.6{\%} versus 13.8 ± 3.7{\%} in controls (p < 0.001). Cell death was greatly diminished by MK-801 pretreatment (15.4 ± 5.1{\%}, p < 0.001). If glutamine was omitted from the medium, glutamate levels after 6 h of hypoxia were reduced from 101 ± 63 to 2.3 ± 0.3 μM, and cell death at 48 h was also markedly reduced (15.4 ± 4.5{\%}, p < 0.001). The α-amino-3-hydroxy-5-methylisoxazole- 4-propionate antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (18.7 ± 5.1{\%}, p < 0.001)and mild hypothermia (33.5-34°C) during hypoxia (19.5 ± 2.7{\%}, p < 0.05) were moderately protective. Basic fibroblast growth factor (24.1 ± 3.2{\%}), the nitric oxide synthase inhibitor N(G)-nitro-L-arginine methyl ester (22.8 ± 8.1{\%}), the antioxidant N-tert-butyl-o-phenylnitrone (18.9 ± 5.9{\%}), and the 21-aminosteroid U74389G (24.0 ± 3.4{\%}) did not protect the cells. N- Acetyl-L-cysteine even tended to increase cell death (30.1 ± 2.5{\%}, p = 0.06). Treatment with MK-801 at the end of hypoxia did not reduce cell death (23.3 ± 2.3{\%}). In separate experiments, a 15-min exposure to 1 mM glutamate without hypoxia did not result in significant cell death (14.7 ± 2.4 vs. 12.2 ± 2.1{\%}, p = 0.07). We conclude that, although somewhat resistant to glutamate toxicity when normoxic, NT2-N neurons die via an ionotropic glutamate receptor-mediated mechanism when exposed to hypoxia in the presence of glutamate. As far as we know, this is the first reported analysis of the mechanism of hypoxic cell death in cultured human neuronlike cells.",
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N2 - Human NTera2 teratocarcinoma cells were differentiated into postmitotic NT2-N neurons and exposed to hypoxia for 6 h. The cultures were evaluated microscopically, and percent lactate dehydrogenase (LDH) release after 24 and 48 h was used as an assay for cell death. After 48 h LDH release was 24.3 ± 5.6% versus 13.8 ± 3.7% in controls (p < 0.001). Cell death was greatly diminished by MK-801 pretreatment (15.4 ± 5.1%, p < 0.001). If glutamine was omitted from the medium, glutamate levels after 6 h of hypoxia were reduced from 101 ± 63 to 2.3 ± 0.3 μM, and cell death at 48 h was also markedly reduced (15.4 ± 4.5%, p < 0.001). The α-amino-3-hydroxy-5-methylisoxazole- 4-propionate antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (18.7 ± 5.1%, p < 0.001)and mild hypothermia (33.5-34°C) during hypoxia (19.5 ± 2.7%, p < 0.05) were moderately protective. Basic fibroblast growth factor (24.1 ± 3.2%), the nitric oxide synthase inhibitor N(G)-nitro-L-arginine methyl ester (22.8 ± 8.1%), the antioxidant N-tert-butyl-o-phenylnitrone (18.9 ± 5.9%), and the 21-aminosteroid U74389G (24.0 ± 3.4%) did not protect the cells. N- Acetyl-L-cysteine even tended to increase cell death (30.1 ± 2.5%, p = 0.06). Treatment with MK-801 at the end of hypoxia did not reduce cell death (23.3 ± 2.3%). In separate experiments, a 15-min exposure to 1 mM glutamate without hypoxia did not result in significant cell death (14.7 ± 2.4 vs. 12.2 ± 2.1%, p = 0.07). We conclude that, although somewhat resistant to glutamate toxicity when normoxic, NT2-N neurons die via an ionotropic glutamate receptor-mediated mechanism when exposed to hypoxia in the presence of glutamate. As far as we know, this is the first reported analysis of the mechanism of hypoxic cell death in cultured human neuronlike cells.

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