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Adaptative response of nitrogen metabolism in early endotoxemia: role of ornithine aminotransferase

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Abstract

Arginine (Arg) and glutamine (Gln) utilization is greatly increased during catabolic stress. While the supply of both amino acids has been advocated in this situation, arginine administration is possibly associated with deleterious effects. From a metabolic point of view, these two amino acids are reciprocal precursors via ornithine aminotransferase (OAT). We hypothesized that OAT plays a key role in the interconversion between Arg and Gln. To test this hypothesis, we evaluated the influence of OAT activity in a model of septic shock induced by intraperitoneal injection of lipopolysaccharide (LPS) in wild-type (WT) and transgenic mice overexpressing OAT (OAT) in the liver, kidney and intestine, i.e. the three main organs of OAT expression. Plasma and tissue amino acid concentrations and tissue OAT expression and activity were measured. Five hours after LPS injection, WT and OAT mice showed a similar response to LPS in terms of inflammatory cytokine production and protein catabolism, suggesting that the interconversion between Arg and Gln through this pathway remains limited. Endotoxemia led to a significant decrease in plasma Orn levels and an increase in liver Orn levels. Of note, Orn levels were always lower in OAT mice. While only plasma Arg and Gln remained unaffected by LPS treatment, hepatic Gln was significantly increased without any difference between the two genotypes. In this model of early endotoxemia, arginine and glutamine maintained their metabolic homeostasis. Our results show an inhibition of OAT activity and expression in the liver following LPS treatment. These data highlight the importance of OAT in ornithine metabolism, especially in the liver, and suggest a post-transcriptional regulation of OAT by LPS in the liver.

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Abbreviations

OAT:

Ornithine aminotransferase

Gln:

Glutamine

Arg:

Arginine

LPS:

Lipopolysaccharide

WT:

Wild type

mOAT:

Murine OAT

hOAT:

Human OAT

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Authors and Affiliations

  1. Laboratoire de Biologie de la Nutrition, EA2498, Faculté de Pharmacie, Université Paris Descartes, 4 avenue de l’Observatoire, 75270, Paris Cedex 06, France

    Gabrielle Ventura, C. Moinard, F. Segaud, S. Le Plenier, L. Cynober & J. P. De Bandt

  2. Service de Biochimie, Hôtel-Dieu, APHP, Paris, France

    L. Cynober & J. P. De Bandt

Authors
  1. Gabrielle Ventura
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  2. C. Moinard
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  3. F. Segaud
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  4. S. Le Plenier
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  5. L. Cynober
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  6. J. P. De Bandt
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Correspondence to J. P. De Bandt.

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Ventura, G., Moinard, C., Segaud, F. et al. Adaptative response of nitrogen metabolism in early endotoxemia: role of ornithine aminotransferase. Amino Acids 39, 1417–1426 (2010). https://doi.org/10.1007/s00726-010-0601-8

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  • DOI: https://doi.org/10.1007/s00726-010-0601-8

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