Article (Scientific journals)
Cellular thiamine status is coupled to function of mitochondrial 2-oxoglutarate dehydrogenase
Mkrtchyan, Garik; Graf, Anastasia; Bettendorff, Lucien et al.
2016In Neurochemistry International, 101, p. 66-75
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Keywords :
Thiamine; _Oxoglutarate dehydrogenase; Neurodegeneration
Abstract :
[en] Decreased thiamine and reduced activity of thiamine diphosphate (ThDP)-dependent 2-oxoglutarate dehydrogenase (OGDH) cause neurodegeneration. We hypothesized on concerted cell-specific regulation of the thiamine metabolism and ThDP-dependent reactions. We identified a smaller thiamine pool, a lower expression of the mitochondrial ThDP transporter, and a higher expression of OGDH in rat astrocytes versus neuroblastoma N2A. According to the data, the astrocytic OGDH may be up-regulated by an increase in intracellular ThDP, while the neuroblastomal OGDH functions at full ThDP saturation. Indeed, in rat astrocytes and brain cortex, OGDH inhibition by succinyl phosphonate (SP) enlarged the pool of thiamine compounds. Increased ThDP level in response to the OGDH inhibition presumably up-regulated the enzyme to compensate for a decrease in reducing power which occurred in SP-treated astrocytes. Under the same SP treatment of N2A cells, their thiamine pool and reducing power were unchanged, although SP action was evident from accumulation of glutamate. The presented data indicate that functional interplay between OGDH, other proteins of the tricarbocylic acid cycle and proteins of thiamine metabolism is an important determinant of physiology-specific networks and their homeostatic mechanisms.
Research center :
Giga-Neurosciences - ULiège
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Mkrtchyan, Garik
Graf, Anastasia
Bettendorff, Lucien  ;  Université de Liège > Département des sciences biomédicales et précliniques > Biochimie et physiologie humaine et pathologique
Bunik, Victoria
Language :
English
Title :
Cellular thiamine status is coupled to function of mitochondrial 2-oxoglutarate dehydrogenase
Publication date :
2016
Journal title :
Neurochemistry International
ISSN :
0197-0186
Publisher :
Elsevier Science
Volume :
101
Pages :
66-75
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 18 October 2016

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