Substrate-dependence of reduction of MTT

A tetrazolium dye differs in cultured astroglia and neurons

Shinichi Takahashi, Takato Abe, Jun Gotoh, Yasuo Fukuuchi

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) reduction is widely used to evaluate cell proliferation and viability. MTT reduction is interpreted to be indicative of cellular metabolic activity, and the site of reduction includes both mitochondrial and cytosolic redox reactions. Astrocytes are believed to rely mainly on glycolysis for ATP generation, whereas neurons are considered to depend more on oxidative metabolism. The present study, therefore, tested the substrate-preference of glucose and its metabolites for MTT reduction in cultures of rat type 1 astroglia and neurons. MTT specific activity of astroglia was much higher than that of neurons. Astroglial MTT reducing activity in glucose-free medium or 2mM glucose with iodoacetate (5mM) was completely blocked. In glucose-depleted medium, 2mM lactate, pyruvate, malate, or acetate elicited minimal increases in MTT reduction by astroglia. In contrast, MTT reducing activity in neurons was enhanced two-fold by pyruvate and the reducing activity of lactate was equivalent to that of glucose, while malate had a small and acetate had no effect on MTT reduction. These results indicate that these two cell types differ markedly in their substrate-preferences for MTT reduction. In astroglia, MTT reduction reflects mainly cytosolic redox activity and is dependent on glyceraldehyde-3-phosphate dehydrogenase. In neurons, pyruvate dehydrogenase supports MTT reduction more effectively than glucose or lactate, even though both of these substrates can produce NADH and pyruvate.

Original languageEnglish
Pages (from-to)441-448
Number of pages8
JournalNeurochemistry International
Volume40
Issue number5
DOIs
Publication statusPublished - 2002
Externally publishedYes

Fingerprint

Astrocytes
Coloring Agents
Pyruvic Acid
Neurons
Glucose
Lactic Acid
Oxidation-Reduction
Acetates
Iodoacetates
Glyceraldehyde-3-Phosphate Dehydrogenases
Glycolysis
NAD
thiazolyl blue
Cell Survival
Oxidoreductases
Adenosine Triphosphate
Cell Proliferation
malic acid

Keywords

  • Astrocyte
  • Lactate
  • Mitochondria
  • Pyruvate

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Cellular and Molecular Neuroscience

Cite this

Substrate-dependence of reduction of MTT : A tetrazolium dye differs in cultured astroglia and neurons. / Takahashi, Shinichi; Abe, Takato; Gotoh, Jun; Fukuuchi, Yasuo.

In: Neurochemistry International, Vol. 40, No. 5, 2002, p. 441-448.

Research output: Contribution to journalArticle

Takahashi, Shinichi ; Abe, Takato ; Gotoh, Jun ; Fukuuchi, Yasuo. / Substrate-dependence of reduction of MTT : A tetrazolium dye differs in cultured astroglia and neurons. In: Neurochemistry International. 2002 ; Vol. 40, No. 5. pp. 441-448.
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