Action of ornithine alpha ketoglutarate on DNA synthesis by human fibroblasts

Journal Article · Wed Jan 31 23:00:00 EST 1990 · In Vitro Cellular and Developmental Biology; (USA)

DOI:https://doi.org/10.1007/BF02624111· OSTI ID:6855208

Vaubourdolle, M; Salvucci, M; Coudray-Lucas, C; Agneray, J; Cynober, L; Ekindjian, O G ^[1]

---

1. Universite Paris XI, Chatenay-Malabry (France)

Ornithine alpha ketoglutarate (OKG) is largely used in clinical nutrition for its anabolic effects. However, the mechanism of its action remains questionable. We investigated the effect of OKG on the rate of DNA synthesis in human fibroblasts. The in vitro experimental procedure required to demonstrate in cell culture the anabolic effects of OKG observed in vivo was found to be glutamine-free and serum-poor medium with sparse cells. In these conditions, OKG induced a significant increase in ({sup 3}H)thymidine incorporation compared to untreated control cells. This effect was dose-dependent and was observed in all the cultures tested. Taken individually, the two constituents of OKG, i.e. alpha KG and Orn, also showed a stimulatory effect, but did not demonstrate a dose-dependent response. Concomitant analysis of extracellular amino acids showed in alpha KG-treated cultures an increase in glutamate and a decrease in aspartate, suggesting a cellular transamination of alpha KG. Glutamine, which is the preferential energetic substrate of fibroblasts, can be produced from glutamate and might play a role in the action of OKG. Moreover, OKG induced a rise in the cellular polyamine content. This, in association with the inhibitory effect on OKG action of difluoromethylornithine, a specific inhibitor of ornithine decarboxylase, suggests a link between the polyamine biosynthesis pathway and the anabolic effect of OKG.

• OSTI ID: 6855208
• Journal Information: In Vitro Cellular and Developmental Biology; (USA), Journal Name: In Vitro Cellular and Developmental Biology; (USA) Vol. 26:2; ISSN 0883-8364; ISSN ICDBE
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
AMINO ACIDS
ANIMAL CELLS
ANIMALS
AZINES
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL PATHWAYS
CARBOXYLIC ACIDS
CONNECTIVE TISSUE CELLS
DICARBOXYLIC ACIDS
DNA REPLICATION
DOSE-RESPONSE RELATIONSHIPS
FIBROBLASTS
GLUTARIC ACID
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
KINETICS
MAMMALS
MAN
NUCLEIC ACID REPLICATION
NUCLEOSIDES
NUCLEOTIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORNITHINE
PREGNANCY
PRIMATES
PYRIMIDINES
REACTION KINETICS
RIBOSIDES
SOMATIC CELLS
THYMIDINE
TRACER TECHNIQUES
TRITIUM COMPOUNDS
VERTEBRATES